2.5 header possibility

[exhaust'd]

hello , i work for a exhaust manufacture here in phx az , and we have had some random calls with people looking for a header for the 2.5 s10/15's .

my boss asked me to find out if there is enough interest in offering something .

[94redSS]

that would be cool

[85 Orange Dime]

i agree and know that i have some friends here in MO that would also buy

[ironduke2.5]

Hell Yeah i would! That would help out alot. You got my vote!

[92 s10 project]

I would be in. I would like to have only a bung for O2, I have no need for the EGR side of it. Both ways would be a nice option, but you may want to include that in your poll.

[89-S-Dime]

A header for a 2.5 is not really worth it unless you have some head work done and plan on installing a bigger cam or you will see minimal gains.

[lesterl]

Quote: Originally Posted by 92 s10 project

I would be in. I would like to have only a bung for O2, I have no need for the EGR side of it. Both ways would be a nice option, but you may want to include that in your poll.

The EGR is ported through the Intake manifold and the head, not the exhaust manifold as far as I know.

[92 s10 project]

There is a pipe that comes off of the exhaust manifold the connects to the intake. At the intake where the pipe connects, there is a flap door operated by vacuum. This is what regulates the amount of hot exhaust coming into the engine. I was under assumption that this was part of the EGR system.

In my case, because I have disabled the EGR valve and its solenoid, the rest of these parts no longer do anything for me.

[lesterl]

That is just a hot air off the exhaust system used to heat the air into the intake on a cold day, alot of people unhook it anyway.

[92 s10 project]

Ah, OK. Since the pipe came from the exhaust, and there is the EGR system, I put 2 and 2 together and came up 5 I guess lol.

[stick shift]

Most definatly interested unless its priced like a Clifford header lol.

[kamesama980]

depending on the design and price, yes. 4-1 header: no. long runner 4-2-1: yes.

[89-S-Dime]

Quote: Originally Posted by stick shift

Most definatly interested unless its priced like a Clifford header lol.

No but it would be made by PaceSetter you get what you pay for.

[JWVortec]

Do what APC does, make a part number on it show it around and then if you get enough interest put it into production.

[What?]

Quote: Originally Posted by exhaust'd

hello , i work for a exhaust manufacture here in phx az , and we have had some random calls with people looking for a header for the 2.5 s10/15's .

my boss asked me to find out if there is enough interest in offering something .

Name of said shop?

[89-S-Dime]

Quote: Originally Posted by What?

Name of said shop?

He works for PaceSetter

[92 s10 project]

I could of sworn I have seen a PaceSetter header on a 2.5, In like a used at or a build log or something, but I could be mistaken.

Either way, I think I will go ahead and change my vote now...

[What?]

Quote: Originally Posted by 89-S-Dime

He works for PaceSetter

True, Pacesetter does reside in AZ


There's plenty 1st/2nd gen s-series down there they could simply fix their error design to improve for better and work on their quality.....

[bagged92]

VERY INTERESTED!!! lol

[exhaust'd]

Quote: Originally Posted by kamesama980

depending on the design and price, yes. 4-1 header: no. long runner 4-2-1: yes.

ive never been sold on tri-y's , a long tube usually makes more power over a lot wider rpm range , granted a 2.5 probably doesnt have alot of top end power

but our ears are open to either design

[kamesama980]

I'm not an exhaust engineer but I've read in many places the tri-Y makes 2 peak torque points where as the long-tube 4-1 makes one, even if it is wider and it's been explained in a way that makes sense. thus a properly tuned tri-Y will make a wider overall power band than any 4-1. I don't care about top end or better total hp @ 5k rpm (spinning the little duke apart lol)... torque is what moves the vehicle and low-end torque is practical. My cressida is the fun car. also, 4-1 headers are also easier to engineer and manufacture (fewer joints to weld) thus cheaper, I understand why you'd want to push them

No offense intended. I'm just stating my thought process to further the goal of mutual understanding. I spose I shouldn't outright say no to 4-1s, more like 4-1: maybe. tri-y: yes.

oyea, and put an O2 sensor bung or 2 (2nd for a/f) gauge) in the collector as well as the runner right after the flange. I'd rather run a heated O2 sensor and see all the cylinders than an unheated seeing 1 cyl like the Toyota Supra headers. there are 2-3 places that are making good money changing that one thing on those headers.

[Rizzle]

how long of runers are you planning on making them with? A 4-1 works fine on a 2.5, the 4-2-1 seems to be more inport hype then anything, as 4-1 work nearly as good.
Tube size?
Collector style and length?
Which market are you aiming for - the street daily driver, performance street, or race?

The tri-y is like the x-pipe/H-pipe deal. x-pipe makes more bottom and top but the midrange of the H-pipe is hard to beat.

[exhaust'd]

how long , diameters , and what style right now is open , diameter is usually dependent on the port size , we like them tube size to be larger than the port with out making the port look like a pin hole(lol) , we wanna leave enough room for some port work to the head

we feel the market is more geared more towards street and economy , than all out drag performance , even more so with gas prices through the roof

with the tri's ive seen the dual peaks , and narrow range , and less over all hp , while longer tube 4-1's have smoother less peaky tq bands , and are not to far below that of a tri , while still making more hp at peak

even the imports have been moving to 4-1 over tri's , and they need all the tq they can get , though im sure your cressida , has some being its got the supra inline 6

[bagged92]

any news on this header??? i really want one!

[slowteg97]

i would definitely be down for a header on the duke its just what it needs, mostly because we can already get parts to give us the low end and mid range we need but nothing that can really give us the mid to top end power we are all searching for. now i know someone will read this and wanna say well the duke is dead after 4500 and cant rev past 5500 but for the guys who have chips from hotchips will know what i mean when i say my truck is chipped and it has no problem gettin to 5500 from 4500 to 5000 its not bad but that last 500 rpms the power does fall off. so if your gonna design and build a header for the duke take the time do some dynoing and give us the mid to top end power cause thats where its needed. and please i know people say without a ported and polished head you wont see any gains worth while but that kinda stands true for alot of vehicles porting and polishing are gonna help any motor flow better but building a header and taking the time to design it so it makes power is very possible just as long as its affordable to the public.

[lesterl]

Has anyone with a little free time taken a dremel and polished up the ports on a head before, I am just curious if that would work instead of paying someone to tear one down and do the same.

[slowteg97]

never took the time to try cause i dont have a spare head layin around, but if i did im only good for a clean up i use to port all my jetski and quad cylinders but a car is alittle different i would think even if you deburred and just portmatch everything you would see nice gains. got me wonderin now lester maybe ill pick one up from the bone yard and try my hand we'll see how motivated i get.

[lesterl]

Yeah, thinking about swiping the head on the spare motor and touching it up.

[ironduke2.5]

Any more news about a header for the ol duke?

[gami 813]

let me know email me at gamiguzman@yahoo.com

Quote: Originally Posted by exhaust'd

hello , i work for a exhaust manufacture here in phx az , and we have had some random calls with people looking for a header for the 2.5 s10/15's .

my boss asked me to find out if there is enough interest in offering something .