This is my setup:

EJ257 engine (forged)
K1 Rod
Wiseco piston (8.9@1 c/r)
Coswort bearing
Cometics head gasket
ARP head stud
Stock RS SOHC head with:
(Ferrea Super Alloy valves,
Ferrea springs,
Titanuim retainers,
TWE Stage 3 turbo cams)
PE 850cc injectors
Stock RS fuel rail
255 Walbrow pump
Lachute Hi volume oil pump
99 RS intake and TB
GT3076R turbo avec un ar de 0.82
Hydra Nemesis EMS
Lachute Costum 3'' Down pipe
2.5'' Lachute cat/back (Magnaflow muffler)
Spearco 6*18*3.5 TMIC
Turbonetics MBC

I do breaking the engine for 3000km but it did have make 260hp and 270tq at the engine at only 6psi of boost! And it also destroy a stock 4.11 trany after only 192km !!!

For the final tuning stage I will run a 3'' Lachute turbo/back to replace the 2.5 exhaust! I will replace the stock exhaust manifold for a TWE headers and change the TMIC for a Gready FMIC!

Question: My goal is to get streatable 400WHP on pump Gaz(94) but my tuner (One of the best STI tuner in Quebec Canada) don't stop telling me not to dream of it becose the RS SOHC head are total ****!!! What do you think about it???

What kind of HP do SOHC Head can Make???

Can you Post RS-T (setuped like me) dyno sheet to show me what it can do?

Please show me I can get 400WHP out of SOHC head???

Thanks in advance for all the info!

 

get a DOHC head...

 

Hey man. I don't know if you are making a correct statement. I've heard that the 2.5RS SOHC flow a lot better than the DOHC's. Only what I've heard...

 

2.5 SOHC heads flow better on the a flow bench than the DOHCs. Obviously not as adjustable, but thats what im goin with.

 

I don't know what the sohc flows but maybe try porting the heads and running oversized valves. It will help flow better since you have big cams.

 

yes, they do flow better.. but the problem comes with adjustablility...

 

Cams are a must, custom ones or cobb's imo.

 

big thanks for the info!