I've got me an S5 jspec for my car, longblock. Before I was running an s5 shortblock, with an s4 front cover and s4 manifolds/etc. Now I've got complete s5 manifolds available, are they better than the s4 ones? direct swap? I've also got an s5 turbo, they're bigger, right? So I should be using that as well. Anything else that I should do?



Is a rebuilt FD Fuel pump + stock wiring + 550cc injectors + S-AFC = enough fuel for 12-14PSI? What's the "ideal" maximum boost for an s5 Turbo?

How can I make the twin-scroll work again with my emmissions crap removed, what silnoid works it, and do I just hook a vacuum line to that? or what. There is a huge difference in low-rpm power with it hooked up

I'm running a top mount right now, but I think I'm going to weld 2 together and front mount them (infront of the rad but behind the a/c condensor). Where can I get piping? I used old rad hoses for my metro turbo, but I'd like to not go the ghetto route with this car

Thanks...

 

Not sure about the manifolds. The s5 turbos arent bigger. They have a fully divided exhaust manifold unlike the s4 turbo manifold.. Also the s5 wg was designed better than the s4 one which only had one small port compared to the 2 ports the s5 had. Not sure about the twinscroll. You will most likely have to custom make your pipes.

 

s4 and s5 manifolds are the same size so just use what bolts up to your motor. for the IC pipeing go to www.atpturbo.com They are great people that usally have ok prices on great stuff. Although there site is down right now for ordering stuff I still like. I am asuming you have 4x550s which will only let you boost up to 9psi. if you get 720 secondairis you can boost up to about 14-15lbs on teh s5 turbo. Everyone will tell you something different when it comes to max boost on the s5 turbo but I think its right around there.

actually its summitracing.com for the IC pipeing but atpturbo kicks *** to.

 

The S5 intake manifold is bigger than the S4 one. The runners are longer and fatter. There are some comparison photos in this thread. The difference isn't necessarily worth paying money for, but if you have them you'd be silly not to use them. I believe it's a direct swap, but since you have them both it'll be easy to check.

The compressor housing, compressor wheel, CHRA and turbine wheel are identical, but the manifold, turbine housing and internal wastegate are completely revised and much improved. Peak power probably isn't much higher, but boost response is much better and the wastegate is far more effective at controlling boost. It even sounds better.

Sounds borderline to me. The stock turbo and intercooler shouldn't really be taken past ~10psi. At the very least rewire the fuel pump, and have it dyno'd to check the mixtures.

The S5 turbo has no twin-scroll flap to operate, so you don't need to worry about it. However if you were keeping the S4 turbo is just a case of removing the solenoid from the rack and plumbing it as per the schematic in the FSM.

 

nz is the lim the same on both the s4 and s5. I feel bad about posting wrong info. sorry

 

nz, thanks. You are always a great source of information.

What needs to get upgraded for more boost? I want to run 12ish psi.

 

you need 550cc primarys and 720cc sec.

 

another thing to note.. the S5 upper/lower intake manifolds sit up higher than the s4 setup.. If you are going to use your S4 top mount intercooler, you may have to be a little creative or else it will sit too high and interfere with the hood..

 

Since the UIM runners are bigger and spaced a bit further apart compared to the S4's, then the LIM runners must also be different to match up.

Intercooler, S-AFC, injectors (in that order). Lowering the intake temps with a decent FMIC will mean less fuel is required to avoid detonation. The S-AFC will allow you to add more fuel if you need it (dyno to check), and only then if this pushes the injector duty cyle too high do you need bigger injectors.

 

I've got an S-AFC, and I'm getting a front mount made right now

yay.

an FD fuel pump is enough fuel to run 720's with that much boost?