I have a s4 turbo rx7... How resrictive is the stock manifold? If I get an aftermarket one that will bolt up to my stock turbo... should I expect any increase in power?

 

You will notice how much faster the turbo will spool with an aftermarket header. However, you will have to also free up the exhaust behind the turbo with a nice downpipe, and non restrictive exhaust to really see some HP changes.

If it were up to me, I would put on a nice exhaust from the turbo out, before I worried about the header (unless it's cracked.)

Jesse

 

do you have to meet emissions?

 

Well, I already have a 3inch turbo back system... I have to take the turbo off to have the wastegate ported... So i figured while I was down there I might as well make this as free flowing as I can without upgrading turbos... I have a 3 inch tid with only one 45 degree bend off the turbo. I have the exhaust system, so why still use this funky manifold?

 

I don't believe that any aftermarket manifolds are made that will fit the stock turbo........they all have universal flanges like t3...t4....I BELIEVE the stocker is a unique size.

And secondly I doubt if they made a manifold that was of a different design than the stock man. that you would see any difference in horsepower beyond 2-3hp so for the amount of dollars and work it would be - otherwise - a complete waste of time

but hey if you find something that fits don't let me stop you from trying it....

 

it shouldnt have taken this many replies for this to be said. There is no mass produced manifold in existence that bolts to the stock turbo other than the stock one. upgraded manifolds are only for upgraded turbos.

 

you both are wrong.

Greddy used to make one(still some new ones floating around out there) and SSAC makes one.

 

yea, I was looking into the SSAC but, will it do anything? here is a link...


http://cgi.ebay.com/ebaymotors/Mazda...spagenameZWDVW

 

no one has any dyno numbers to prove anything but after looking at the design, if it holds up to the abuse, they should flow better than the stocker. how much of a gain? i don't know yet as i haven't had a chance to do just the manifold swap as a mod alone yet.


also to the posters above, keep in mind mods are usually seen as a % of horsepower increase. on a stock car a mod like this may only produce 2-3HP gains but on a highly modified car it may add up to 20HP or more. (yes it is not a linear figure, the stock manifold primary runner iterrupts much of the secondary manifold's flow so just about any other design would be an improvement IMO and 2-3HP is a rather conservative number)

 

Look at this

http://cgi.ebay.com/ebaymotors/Mazda...temZ8026758978

I realy like this seller on Ebay. I have not purchased from them yet, but I plan on doing so soon. It is built and designed for a direct bolt on for your STOCK T2 Turbo.

Jesse

 

I stand corrected, but buying that is a total waste of time. why the hell would they even make it?

 

oh god here we go again, the haters, the haters.....

 

I've heard from a source that a aftermarket tubular is good for 40rwhp over a aftermarket cast unit. Now take that with a grain of salt, as everything else on the internet. That was on a street car, 15psi, 400-ish rwhp.

 

lol, i think to many people have had there korn flakes pissed in! i wonder if that ssac manifold would clear enough room to eliminate the need for a spacer on a 6 port?? just curious.

 

if the manifold is tuned yes, i highly doubt that SSAC tuned the pipes which is why i am being conservative with the numbers.


i doubt it, the one Nick and i installed the fitment was almost perfectly OEM with the exception of the slightly larger mounting holes. the hybrid turbo was still a snug fit even on a T2 engine.

 

If you want to go custom Get a manifold made that is like..6-8 inches long per pipe.

 

Why?

 

that ssac could cure my manifold leak!?!?!

 

Care to explain why? Without some form of explanation your comment is worthless.

Your manifold isn't leaking. The leak will be from the gasket between the manifold and the turbo or the engine and the manifold. Replacing the failed gasket will cure the leak.

 

even if it didnt add a ton of hp, IMO it would look better in there

 

For those of us with stock, cracked and brittle S4 manifolds i bet that would be worth the money. Hell, its almost cheaper then a crack free used one...

 

thanks nz. i posted this along time ago about a bad (used) gasket thats leaking and i thought i was told it was the manifold or spacer. still gonna check the spacer though. this will def. look better than my old beat up stock manifold.

 

88rxn/1: No. its a stock t2 replacement. if it wasn't we'd need a new downpipe, diff than stock tid, and a new pipe to the intercooler


t2 wins, n/a's lose

 

i know, its just that it would look way better. none of that applies to me though.

 

I'm running the ssac stock replacment manifold right now. Working great. I wish I could atest to it's sole performance improvments but I also installed the rtek 1.5 at the same time. Car does pull better than ever though. Time will tell how it holds up, I have less than 100 miles on the upgrades right now so we'll see.
Dom