4.3 -> 305tpi swap

55mikey55 · 09-22-2009, 10:07 PM

Pontiac 84 tpi WITH CUT HARNESS...

going into 92 sonoma, on 03 zq8 frame, pushing a nv3500 tranny, and 4.11 rear gears. i got my mounts, but the only problem is going to be the harness... any ideas?

55mikey55 · 09-22-2009, 10:32 PM

oh yeah, i forgot, the 305 came with the computer and all sensors, but idk if the flex plate and flywheel from my truck will swap out. the flexplate is on te 305, the flywheel is on the truck(4.3tbi)

Crew Cab Sonoma · 09-23-2009, 02:19 PM

85 was the first year for TPI.
86-later 4.3 & SBC flywheels/flexplates wont interchange
with 85-older engines because of the external balance weight
and the smaller crankshaft bolt circle, necessitated by the
one piece crank seal on the 86-laters.

wiring, you've got a real mess on your hands there...
might be easier to aquire a 90-92 "speed density" TPI
wiring harness and computer from an F-body.

afraidof7 · 09-23-2009, 06:21 PM

http://fuelinjectionconnection.com/

I did this, $360 with a ecm or $310 if you send the computer back. Mine was the same year engine you have but I converted it to speed density to get rid of the ugly maf sensor.

I tried using the stock harness and it wasn't worth my time to try to figure it out.

55mikey55 · 09-23-2009, 07:34 PM

Quote: Originally Posted by afraidof7

http://fuelinjectionconnection.com/

I did this, $360 with a ecm or $310 if you send the computer back. Mine was the same year engine you have but I converted it to speed density to get rid of the ugly maf sensor.

I tried using the stock harness and it wasn't worth my time to try to figure it out.

it says it will support a 700r4, is that all, or will a 5 speed work too?

55mikey55 · 09-23-2009, 07:38 PM

Quote: Originally Posted by Crew Cab Sonoma

85 was the first year for TPI.
86-later 4.3 & SBC flywheels/flexplates wont interchange
with 85-older engines because of the external balance weight
and the smaller crankshaft bolt circle, necessitated by the
one piece crank seal on the 86-laters.

wiring, you've got a real mess on your hands there...
might be easier to aquire a 90-92 "speed density" TPI
wiring harness and computer from an F-body.

dude said it was an 84, but it's tuned port so, i'll have to get a flywheel for the tuned port and hope the starter works and clutch bolts up??!?!?

55mikey55 · 09-27-2009, 04:51 AM

ok. went to Columbia and picked up motor. dude(Kevin) said he had a 305 TBI in the way and for me to get mt tpi for 150... i had to take the tbi too!

So... 100 mile trip back with two 305s i had plenty of time to figure out how to tell the mother-in-law she needs a v8 in her truck .

fuel injection connection has got the harness, thx afraidof7. that's gonna be a major time saver, if i don't wire it up myself... I'll take some pics with my shitty camera tomorrow, since it's dark now...

PS i got both my JTR books today. the wifey had them in the room when i got back. sooo that makes 250 even that I've spent so far gas and all.

sosolos10 · 09-27-2009, 05:59 PM

hey man i have a TPI harness if you need it PM ME i bought a PAINLEES HARNESS for my 383 TPI install

sosolos10 · 09-27-2009, 06:00 PM

also i have a 350 flex plate

55mikey55 · 09-27-2009, 09:45 PM

here's the pics i promised:

Njoy

sosolos10 · 09-28-2009, 02:00 AM

83blazer28 · 10-02-2009, 09:55 AM

305's are good motors, i've never had a boat float away when i used a 305 as the anchor....

55mikey55 · 10-09-2009, 03:23 PM

Quote: Originally Posted by 83blazer28

305's are good motors, i've never had a boat float away when i used a 305 as the anchor....

have you got a 305 in your truck?
did you know, dick, that a 305 has more torque than a 350, dick?
oh yeah... and a tpi top end will swap over to a 400 whenever i get ready...
What else???!?!?

Chevhead89 · 10-09-2009, 10:43 PM

dude you are funny! a 305 make more torque then a 350. HA HA. no replacemnet for displacement.
but they are good little engines.
o and have fun with that TPI BS. i got smart and scrapped mine. lol
but if you build any kind of power with your 406 you will sufficate it with a TPI!!! like after 4k it turns into a turd. that is a TPI in stock form...

55mikey55 · 10-10-2009, 01:24 PM

a 305 does make more torque than a 350. i'll have to read up on exactly why, but i'll get back to you in a pm. 350 has more hp than 305, but its not really enough to feel the difference. the only reason i am even starting this project now is my 4.3 is about shot, and i found this 30k mile motor for $150. (i changed a water pump for my boss and he hooked me up with a friend of his that had 2 305s. one had tpi and one had tbi. he told me in order to take the tpi home for 150, i had to take the other too!!)

yeah, but I'm adding a tuner program and will probably end up mounting a laptop in the truck to tune everything in real time. i have found a book that lets me bypass all emissions, and wire up the engine to delete or set all sensors to read what i want them to. so when i change the long block, I'll adjust the computer accordingly. I'm not new to building motors. i had my 4.3 pushing around 260 horses. on tbi. as long as i get this bitch wired up where it will run, i can build plenty of power that i can swap out into a bigger ci engine

pearl91chevy · 10-10-2009, 02:23 PM

260 on your old 4.3?? wanna see proof

55mikey55 · 10-10-2009, 02:54 PM

the motor is for sale $300

55mikey55 · 10-10-2009, 02:56 PM

around 260 mind you. i'm running high 14s at darlington, and my old boss at the tire shop estimated it by e.t.'s

ezrollin561 · 10-10-2009, 10:47 PM

The 305 is often dismissed as swap material and indeed you will get more hp from a 350 with the same mods.If you have a 305 laying around and aren't interested in max hp then a 305 can suffice.It isnt hard to get 300 hp from a 305 if you use the good heads,ported 305 bbl heads,305 vortec heads or aftermarket 305 heads,also the small chamber oem vette alum heads can be used.I wouldn't go with a 305 if I wanted over 300hp though I saw one dyno'd at 487 hp !!!

55mikey55 · 10-17-2009, 11:20 PM

hey everybody, if you're doing a tpi swap of any kind, speed density or maf, this is the manual that you need. get your computer, sensors, and ebay Item number:370221453669
or http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=370221453669&ru=http%3 A%2F%2Fmotors.shop.ebay.com%3A80%2F__%3F_from%3DR4 0%26_trksid%3Dp4712.m39.l1313%26_nkw%3D37022145366 9%26_sacat%3D%26_fvi%3D1&_rdc=1

1fast4by · 10-17-2009, 11:30 PM

@ this thread!!!!!!!!!!