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400 hp on stock 4.3 internals?

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Old 04-19-2010, 12:10 PM   #1
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400 hp on stock 4.3 internals?

Hi everyone, I have a 4.3 in a full size single cab truck. It has a vortech supercharger now at 8-9psi, and I'm in the process of hooking up an SDS controller I bought off a forum member. I don't think the stock v2 trim kit can get me to 400bhp, so I'm thinking shoot for about 350bhp and then 35-50 shot of nitrous (since nitrous shot is measured at the wheels no?).

I don't want any extensive engine modifications, maybe just 14-15psi boost off the s/c. It has coolingmist meth injection which I use 50/50 water meth. I am going to buy a big air/air intercooler before swapping pulleys and tuning for more boost. How much will 14-15psi get me hp wise?

How much nitrous, progressively controlled, can the stock engine take while lasting a while on that much boost (assuming the tune is good and enough retard)?

The truck is going to go through some severe weight reduction and likely be somewhere around 3800lbs when its all done (buying an aluminum flatbed and one piece front among many other things). Goal is sub-13 second quarter. I think 400hp will get me there with some fat tires and the right suspension, think I can get that on stock internals? What do I need to get there, shorty headers/exhaust cutouts....??

Truck has 5spd and 3.90 gears, if necessary I could get 4.10s but don't want to

Last edited by chevy262; 04-19-2010 at 12:19 PM.
Old 04-19-2010, 05:44 PM   #2
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Re: 400 hp on stock 4.3 internals?

400 Rear wheel horse power I've been there and done that on stock interals minus different pistons. They will be your biggest enemy not to melt them into a ball of goo. Unless you have a older motor with cast pistons which stopped in 92 even then it'll take its toll. Forget shorties and run long tube headers. If the tune is good on no more then a 50 shot she'll last a while. I the tune sucks and you got hyperjunk pistons they'll start to melt quick even on a 50 shot with that much boost.
Old 04-19-2010, 09:07 PM   #3
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Re: 400 hp on stock 4.3 internals?

You can get there, but you won't last long. I've been there done that and its exactly as disturbing_v6 said.

And you aren't going to simply get there by throwing a supercharger, nitrous, and a tune together. First off your supercharger isn't going to get you to 350rwhp, realistically you are looking at 300rwhp @ 12lbs boost intercooled. That should be what you aim for in boost. Hopefully you weren't planning on running that all on that shitty FMU they threw into that kit...So you're going to have to get an inline fuel pump...which isn't going to do you real justice, but it will get you to 400hp. Get a cam, this is a the only must if you are going to do this, 270ahr comp cam custom grind. You can find the stats on here for what you need to get it grinded to, there's been a couple of us that's attempted this build in the past....so there's plenty of write ups with specs.

- TUNE YOUR TRUCK HERE -

Then go with a wet kit, this better than a dry kit because you can piggy back more fuel into the engine this way, rather than a dry kit. I ran a 75 shot and it took maybe two bottles before the engine was gone....just so you know. But if you can get yours tune in as well as mine then you could drop that to a 50 shot and still hit 400rwhp. I see you mentioned a progressive controller which is exactly what you will need. If you set this to spray wide open at 3000rpms (standard setup) your engine will toast. So go with the controller, gradually building with the rpms.

This is where the fun starts. You will spend more time tuning your truck than driving it. So if you haven't started hating yourself for trying this you will now, because getting everything tuned in with one another takes forever, the knocks will get haunt you. Also you will need to get your ECM flashed.....

The NV3500 that you have...... you're good for about 350rwhp and then its gone. And hopefully you have at least the 8.5 rear end.... if not that's gone too.

Also the alcohol injection system will only do you good in cooling the intake temps.... its a really good idea to run this with this setup, but you won't see any hp gains. I ran a 50/50 mix and saw about a 17*-20* temp decrease, oh and get a BIG tank ( 15 Gal ) and mount in the back of your truck. I did this and mounted it over my rear axle, then put my 50/50 mix in that. It helped with traction and that little tank they provide you with will last you about 5 mins..... and if you don't realize it ran out your little injection pump will burn up.

But hopefully this helps and will give you an idea on where to go with it. But make it your own and show us something.
Old 04-19-2010, 09:11 PM   #4
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Re: 400 hp on stock 4.3 internals?

Also get yourself a TRUE dual exhaust, headers ( JBA cermanic coated ), MagnaFlow High Flow Cats, Flowmaster 40 series mufflers.... the best sound you will get. Also you are going to have to run higher than 93 octane, otherwise the knocks won't go away..... Also you will need a MSD BTM 6 ignition control box, Good ignition parts..... Taylor 8.5mm wires, ACDelco or Champion plugs, Accel Rotor Cap, etc.

Also I would look into MPFI marine systems, this would solve lots of problems.... but really only worth it if you do a complete engine build.

Last edited by SCXtreme; 04-19-2010 at 09:19 PM. Reason: Though of more
Old 04-19-2010, 10:21 PM   #5
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Re: 400 hp on stock 4.3 internals?

thanks for all the info guys, I'm not looking for 400rwhp. looking to get 400bhp out of this thing (maybe 360 whp) The fuel system I'm using is a 2 extra injector SDS unit, still shopping around for someone to weld the aluminum bungs. The cool thing about this truck ('06 silverado) is that the fuel pump is the same unit used on all fullsize chevy engines, even the big 6.0+ engines. I'm safe to about 600hp on stock fuel pump/returnless style system so thats not an issue, already called the manufacturer of the fuel pump.

And yall are right I've already spent about a full week or so over time tuning for the current setup I have now, and I haven't even gotten into tuning spark knock (there isn't any yet at 8-9lbs)

SCXtreme - The 8.6 I have now has already been built, the guy said it should take around 400hp to the wheels which is over the amount I'm looking for, it might need stronger axles when I get some sticky tires though. I cant do the marine intake because it's a returnless system, already been through that before. I'm guessing the plastic plenum will crack or break after 12-14 psi which is why its going to be limited around there. I also cant get any aftermarket ignition system, because no one sells aftermarket coils for this truck, it's a bitch. Already have ngk tr6 plugs with the correct gap. I'm probably going to end up going with true duals like you say, the stock system is really restrictive, it's just I'm in Houston and have lots of emissions testing so Im tryin to keep the exhaust near stock as long as possible


So If I can get 14lbs of intercooled boost showing up with correct tuning, maybe 35 wet shot progressive controlled (and retard timing for this also), that might get to the goal of around 360rwhp or about 400hp at the crank? After hearing everyones stories I think the less nitrous the better, but it's going to be so hard to get there without any nitrous.

Last edited by chevy262; 04-19-2010 at 10:29 PM.
Old 04-19-2010, 10:26 PM   #6
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Re: 400 hp on stock 4.3 internals?

im shootin for 300rwhp with the 270, heads, marine intake, and the wynjammer@8psi.

your going to have to do head work and change the cam either way.

i think the trans should be fine though, JDB is running 400rwhp with the nv3500 and then there is Sebast19 in the 11's with the same trans i believe.

http://www.s-seriesforum.com/forum/s...ad.php?t=57528

http://www.s10forum.com/forum/f107/s...hp-n-a-415031/
Old 04-19-2010, 10:48 PM   #7
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by s106banger
im shootin for 300rwhp with the 270, heads, marine intake, and the wynjammer@8psi.

your going to have to do head work and change the cam either way.

i think the trans should be fine though, JDB is running 400rwhp with the nv3500 and then there is Sebast19 in the 11's with the same trans i believe.

http://www.s-seriesforum.com/forum/s...ad.php?t=57528

http://www.s10forum.com/forum/f107/s...hp-n-a-415031/
thanks s106, that headwork and cam really has to make more power, cuz I've seen other guys on 8lbs with like 240-260rwhp. 40-60 hp thats a huge improvement!

thanks for the links, I want to keep the stock nv3500, I blew second gear but this was when I was just first driving it learning how to drive a manual, I'm a lot better now and won't bust it as long as the clutch can take the power, if those guys are doing it dont see why I cant with a little less power.

Hoping for around 360 rwhp, have no idea what crank/bhp that is my guess was 400 bhp but could be as much as 440bhp

What do yall do to the heads for the extra power, porting and just a valve job or anything special?

Last edited by chevy262; 04-19-2010 at 10:49 PM.
Old 04-19-2010, 11:45 PM   #8
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Re: 400 hp on stock 4.3 internals?

Head work and the right cam is what will make power. I'm not running boost just nitrous and tuning can be a pain in the ass. My motors built to handle tons of the juice, but 0 boost. Typically the same thing goes for boosted engines. Lots of boost very little juice its just to much of a pain to tune except for diesels. 400 crank ponies will net you around 320 RWH give or take on drive line loose. Personally I like autos for drag racing. There are a few of us in the 11s on the bottle on here. Been 11.0 Seabast19 been low 11s as well. Once tuned a little better I'm stepping up from the 150 to only god knows were land. But exhaust is a must. I'm running 1 7/8 inch primary long tubes and still running a 1000+ degree EGT with a fuel mix of 9.7 on the wide bands.
Old 04-21-2010, 12:27 AM   #9
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by disturbing V6
Head work and the right cam is what will make power. I'm not running boost just nitrous and tuning can be a pain in the ass. My motors built to handle tons of the juice, but 0 boost. Typically the same thing goes for boosted engines. Lots of boost very little juice its just to much of a pain to tune except for diesels. 400 crank ponies will net you around 320 RWH give or take on drive line loose. Personally I like autos for drag racing. There are a few of us in the 11s on the bottle on here. Been 11.0 Seabast19 been low 11s as well. Once tuned a little better I'm stepping up from the 150 to only god knows were land. But exhaust is a must. I'm running 1 7/8 inch primary long tubes and still running a 1000+ degree EGT with a fuel mix of 9.7 on the wide bands.
disturbing v6 - how much does your truck weigh? 11.0 is nuts man, you just need a tick more for a 10 sec v6 truck ....9.7 AFR is nuts

You think 14 intercooled s/c hp will get 320rwhp? I'm really looking for 360rwhp. What would I need for 360 rwhp... 18psi intercooled? It's hard for me to tell real world what it might be, cuz of the belt hp loss is probably a lot with the s/c. The V-2 maxes out around 18-20psi I believe. Can the engine take that if tuned correctly? That might be a better idea than adding the extra weight and parts and tuning for nitrous.

Here's my problem - I can't swap to a marine intake without dropping a bunch of cash on custom fuel rails and already decided not to do it, and the stock plastic plenum might crack or break if I try to boost like 18psi or something crazy. Thats why I wanted to add nitrous so I wouldnt run into that problem. But then it makes sense that any nitrous with that much extra volume of forced air will make it even hotter, maybe I'll just stick with the boost.

I could as a last resort fab up a steel upper plenum, box style, that wouldn't take a whole lot of skill but it also wouldn't flow air as good as the plastic one... but it wouldn't crack or break either

Last edited by chevy262; 04-21-2010 at 12:31 AM.
Old 04-21-2010, 12:43 AM   #10
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Re: 400 hp on stock 4.3 internals?

btw guys I found a place that sells an all-aluminum flatbed 7ftx66inches at 190lbs for 1800$, not including headboard/headache rack or bumper not sure if that includes shipping.
http://worktrucksales.com/yscott-litefb.htm
After selling the old bed it'll prob. cost only 400-600$. Thats the flatbed I'll be getting to shed about 300-400lbs and still be able to use it to haul shit if I need to

this is the front one piece I'm going to get
http://mysite.verizon.net/trailerpro...hevy1piece.htm
this I'll wait a little while, theres so much bracing in the stock front wheel wells and fenders that its going to take a little time to make it safe, probably good for another -150lbs though. That company has s-10 stuff a lot cheaper too

And hopefully a 6/6 drop to take advantage of those wide front fenders, might need to cut up the aluminum flatbed a little to fit fat tires

Last edited by chevy262; 04-21-2010 at 12:46 AM.
Old 04-21-2010, 12:52 AM   #11
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Re: 400 hp on stock 4.3 internals?

The only time you would have to worry about your plenum cracking would be if you backfired it hard through the intake. I have KOed one manifold with a nitrous backfire, but that was on a fat 150 shot and poor tune...

400hp on the factory rotating assembly is do-able..It just wont last too long on a blower+spray.

Im with disturbing..Its going to really pick up for you in the heads, cam, and tune.
Old 04-21-2010, 01:44 AM   #12
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Re: 400 hp on stock 4.3 internals?

^^^ okay thats reassuring, hopefully the plastic plenum won't crack.

I'm thinking about just tuning it to a bunch of boost. I think with about 2psi lost from an intercooler I should be able to get about 17psi total maxed out. Gotta check and see if HPT makes a 2 bar OS for my truck, have a 1 bar now so after I get the SDS installed and intercooler I can get to 14-15psi


I think my goal was a little low, I think I need around 440+crank/engine hp. So with head work and cam/tune/exhaust etc, Do yall think 17-18psi intercooled will get to around 360rwhp or into the 12's with a 3800+ lb truck?

Last edited by chevy262; 04-21-2010 at 01:45 AM.
Old 04-21-2010, 02:01 AM   #13
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Re: 400 hp on stock 4.3 internals?

Boost isnt about pressure, its about CFM... That v-2 isnt going to provide that kind of pressure and CFM...thats way out of its efficiency range...
Old 04-21-2010, 11:08 AM   #14
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Re: 400 hp on stock 4.3 internals?

Don't remember what the specs are on the S-Trim, but you might want to look into an rebuild and upgrade from Vortech to an Si-Trim. When I was taking to Vortech, it was running around $700+shipping for the rebuild and upgrade.

Just throwing that out there for ya.
Old 04-21-2010, 12:17 PM   #15
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by 1fast4by
Boost isnt about pressure, its about CFM... That v-2 isnt going to provide that kind of pressure and CFM...thats way out of its efficiency range...
I remember reading about the V2 has around 75% efficiency or something. so if they say it maxes out at 17 psi it's probably not making much power after like 14psi because it can't move more air it just makes more pressure?

Last edited by chevy262; 04-21-2010 at 12:19 PM.
Old 04-21-2010, 12:23 PM   #16
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by rob8284
Don't remember what the specs are on the S-Trim, but you might want to look into an rebuild and upgrade from Vortech to an Si-Trim. When I was taking to Vortech, it was running around $700+shipping for the rebuild and upgrade.

Just throwing that out there for ya.
I looked on their website, that looks like the best solution cuz that one maxes out at 22psi with efficiency up to 78%, so 17.14psi is where its most efficient, that's perfect I think for what I need.

The stock V-2's are 17psi max with 75% eff. so they're most happy at 12-13lbs boost. I'll keep it tuned to 12-13psi until I can get the upgrade to Si trim
Old 04-21-2010, 02:57 PM   #17
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Re: 400 hp on stock 4.3 internals?

I've added weigh for the class I'm running. With me the truck ways 3110 depending on me. Yes 9.7 is extremely rich. Thats why I'm working on tuning it in to get it closer to the 11.8 to 12:00 AFR range. From there I can bring it in closer to 100 percent off the line.
Old 04-21-2010, 03:09 PM   #18
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Re: 400 hp on stock 4.3 internals?

http://www.youtube.com/watch?v=evL5tkxfbpY

this guy is running the 266hr cam, 4.10's in the back, a tune, and bored .60 over makin 342bhp and 318rwhp and 353 torque
pretty beastly for a s10
Old 04-21-2010, 03:25 PM   #19
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Re: 400 hp on stock 4.3 internals?

^ sounds stock...I would venture as far as to say its pretty much a stock truck...Certainly no 342hp
Old 04-21-2010, 03:30 PM   #20
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Re: 400 hp on stock 4.3 internals?

that is not stock, i got the same exhaust,
the cam lope is totally different
its got a cam, whether it is really pumpin 318 to the wheels idk
Old 04-21-2010, 03:34 PM   #21
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Re: 400 hp on stock 4.3 internals?

This is mine, I just shot this this morning... Taking it out of winter hiding..
http://www.youtube.com/watch?v=s1XT-f15ldI
And mine makes just above 300rwhp with out the bottle..That truck is no where near that.

poor quality digital still camera
Old 04-21-2010, 03:39 PM   #22
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Re: 400 hp on stock 4.3 internals?

you never know
he could be, cant always tell whats done to it by the sound of the exhaust
but i was just going by what he said in comments
maybe he had a port and polish, it is rebuilt, btw
maybe long tubes, maybe a bottle
idk, he could be making 300
Old 04-21-2010, 04:02 PM   #23
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by 1fast4by
This is mine, I just shot this this morning... Taking it out of winter hiding..
http://www.youtube.com/watch?v=s1XT-f15ldI
And mine makes just above 300rwhp with out the bottle..That truck is no where near that.

poor quality digital still camera

sound kinda like a pissed of weed wacker in a drain pipe
Old 04-21-2010, 04:08 PM   #24
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Re: 400 hp on stock 4.3 internals?

Yup, 4.3s sound like shit... That and its a digital camera, the truck is loud, so im pretty sure the mic was maxed...And the truck was also 90% covered in that tarp from winter..

Thats a 270 cam, P&P heads, JBAs, 2.5" Y, 3" Hooker MaxFlow
Old 04-21-2010, 06:25 PM   #25
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Re: 400 hp on stock 4.3 internals?

jesus 1fast4by - 300 rwhp without bottle? Do you have a build thread somewhere?
Old 04-21-2010, 07:50 PM   #26
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by stevblev
http://www.youtube.com/watch?v=evL5tkxfbpY

this guy is running the 266hr cam, 4.10's in the back, a tune, and bored .60 over makin 342bhp and 318rwhp and 353 torque
pretty beastly for a s10
Hmm thats a 7% drivetrain loss, his numbers are off

I seriously doubt he's making that kinda power if its a mail order tune like he said. We're talkin 150-180hp over stock from a cam, exhaust, bolt ons and mail order tune?
Old 04-21-2010, 07:54 PM   #27
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by 1fast4by
Yup, 4.3s sound like shit... That and its a digital camera, the truck is loud, so im pretty sure the mic was maxed...And the truck was also 90% covered in that tarp from winter..

Thats a 270 cam, P&P heads, JBAs, 2.5" Y, 3" Hooker MaxFlow
Damn where did that sound come from?? Is it the head work and cam?? It really does sound like a ricer What were you revving it to, maybe yours revs a lot higher

My exhaust sounds verrry close to my buddies 5.3, but that could just be because mine is stock internally compared to yours. Will I have the same sound as that with head work and a cam?

Last edited by chevy262; 04-21-2010 at 07:58 PM.
Old 04-21-2010, 08:38 PM   #28
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Re: 400 hp on stock 4.3 internals?

Here is a ancient ass video of mine with the other motor need to get one with the set up I have now. Don't think it sounds to raspy. Or at least not like a pissed off rice burner.http://video.cardomain.com/VideoPlayer.aspx?id=654206

As for the yellow s-10 youtube truck I highly doubt its making over 300.
Old 04-21-2010, 08:55 PM   #29
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Re: 400 hp on stock 4.3 internals?

like i said, its not my truck, just trying to help out a little
back to the op's original post
300 hp is not that hard to get to
if you got the money
400 hp is a little more challenging
now for those who like to argue
http://www.youtube.com/watch?v=R9dA0...eature=related
argue over that one lol

Last edited by stevblev; 04-21-2010 at 08:57 PM.
Old 04-21-2010, 09:07 PM   #30
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Re: 400 hp on stock 4.3 internals?

Haha.
Old 04-21-2010, 09:11 PM   #31
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Re: 400 hp on stock 4.3 internals?

^thats not a V6

and chevy262 the rev was to around 5-6k it will twist 6750
The sound is a little off on video, like I said, its a Nikon Coolpix still camera.
Old 04-22-2010, 12:07 PM   #32
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by disturbing V6
Here is a ancient ass video of mine with the other motor need to get one with the set up I have now. Don't think it sounds to raspy. Or at least not like a pissed off rice burner.http://video.cardomain.com/VideoPlayer.aspx?id=654206

As for the yellow s-10 youtube truck I highly doubt its making over 300.
Ya that one sounds good, but you can hear that v6 sound at redline, it's pretty distinct
Old 04-22-2010, 12:10 PM   #33
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by 1fast4by
^thats not a V6

and chevy262 the rev was to around 5-6k it will twist 6750
The sound is a little off on video, like I said, its a Nikon Coolpix still camera.
It was probably the camera, but I've been noticing these built 4.3's sound similar at idle or down low but the high rpms still sounds like a cross between a ricer and a v8, which it should really when you think about it

Last edited by chevy262; 04-22-2010 at 12:20 PM.
Old 04-22-2010, 12:18 PM   #34
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by stevblev
like i said, its not my truck, just trying to help out a little
back to the op's original post
300 hp is not that hard to get to
if you got the money
400 hp is a little more challenging
now for those who like to argue
http://www.youtube.com/watch?v=R9dA0...eature=related
argue over that one lol
That one sounds good, I like listening to what it sounds like at redline thats where the v6 sound is I'm finding out... which he didnt redline it much

the lope at idle is too fast to be an aggressive v8, why would he build a small block then throw a 240-260 cam at it, which is what it sounds like.


But a lot of those guys on youtube don't know their ass from a hole in the ground. I was looking on there once and a guy in a 2.8 camaro said he was making well over 320hp with bolt ons. He added collectively all the hp numbers of all his bolt ons and came to the conclusion he had added 200hp to his 120hp engine . You can usually tell the guys who are fresh, they don't make outrageous claims like that

Last edited by chevy262; 04-22-2010 at 12:20 PM.
Old 04-22-2010, 03:18 PM   #35
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Re: 400 hp on stock 4.3 internals?

yea its definitely a v6, he says in his comments
had to do some head work for that big cam though
this is the cam specs
lunati custom grind
227/234 .478 .480 112lsa lunati

oh and
Fact: Your V6 does not sound like a V8
epic fail
Quote: Originally Posted by 1fast4by
^thats not a V6
apparently that one does sound like a v8 lol

Last edited by stevblev; 04-22-2010 at 03:27 PM.
Old 04-22-2010, 03:29 PM   #36
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Re: 400 hp on stock 4.3 internals?





http://www.youtube.com/watch?v=dRQaPn04GeQ



figured id toss in my 2 cents too.

That yellow one sounds stock......definately not 300hp
Old 04-22-2010, 03:35 PM   #37
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Re: 400 hp on stock 4.3 internals?

what kind of supercharger do you have
and what program are you using to tune it?
and idk what this guy has
sounds like a monster cam, must be pumpin bout 450hp to the wheels
http://www.youtube.com/watch?v=kbX3v...eature=related

Last edited by stevblev; 04-22-2010 at 03:38 PM.
Old 04-22-2010, 06:27 PM   #38
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by stevblev
and idk what this guy has
sounds like a monster cam, must be pumpin bout 450hp to the wheels
http://www.youtube.com/watch?v=kbX3v...eature=related
Hahaha shakes the whole truck.
Old 04-22-2010, 07:15 PM   #39
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Re: 400 hp on stock 4.3 internals?

this guys comment cracks me up everytime is see it

Hulky69999 U guys are ****in all stupid lmfao it's a guy in the back ground making those noiseis and shaking the truck nice truck thoe but u could only tell it's a guy in the back ground hahahaha lol dum assssis

hello captain obvious
Old 04-23-2010, 08:56 AM   #40
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Re: 400 hp on stock 4.3 internals?

Well I'm havin a problem now, It wont pass emissions. The truck is running too cool. It has a 195* thermostat and it's never gone above about 160-165, even on a hot summer day at idle or around town driving. And with the s/c and no intercooler all that hot air can't burn well enough for the emissions. The place I had it inspected said to put in a 210* or a little higher to get the temp up to around 180.

Will this work? Why does the truck run so cool, do yalls run 30*+ below the thermostat temp??
Old 04-23-2010, 09:06 AM   #41
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Re: 400 hp on stock 4.3 internals?

mine runs at 155* on a 40* morning... wow mine runs cold. lol. thats a 180* t-stat. (just got hptuners)
Old 04-23-2010, 09:21 AM   #42
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by s106banger
mine runs at 155* on a 40* morning... wow mine runs cold. lol. thats a 180* t-stat. (just got hptuners)
Ahh! 40* morning in april! I would shoot myself, thats about the coldest it ever gets here all year

I dunno why they do, I did some searching and theres a lot more 4.3's with too cool engine temps than overheating. I think mine actually runs around 160-165 but then when I'm on the pedal it sometimes comes up to 175


I like that HPT interface, I'm thinkin about buying one of those little LCD screen gauges that you plug in to the OBD port, so it can read IAT's and knock or some other reading without having to wire up a gauge
like this: http://blogs.mustang50magazine.com/6...uge/index.html
I've seen other ones like that too

Last edited by chevy262; 04-23-2010 at 09:24 AM.
Old 04-26-2010, 12:11 PM   #43
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Re: 400 hp on stock 4.3 internals?

Quote: Originally Posted by SCXtreme
Also get yourself a TRUE dual exhaust, headers ( JBA cermanic coated ), MagnaFlow High Flow Cats, Flowmaster 40 series mufflers.... the best sound you will get. Also you are going to have to run higher than 93 octane, otherwise the knocks won't go away..... Also you will need a MSD BTM 6 ignition control box, Good ignition parts..... Taylor 8.5mm wires, ACDelco or Champion plugs, Accel Rotor Cap, etc.

Also I would look into MPFI marine systems, this would solve lots of problems.... but really only worth it if you do a complete engine build.
opinions opinions. and you could run any muffler you wanted with a cutout. but true duals for sure and full exhaust. i'm gonna go with everyone else and say go ahead and put pistons in it or else youll be rebuilding it very soon
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