Anyone running the stock turbo + Cosworth head or equivalent, care to give some feedback on this type of set up. 10q

 

That would be a completely worthless setup. Cosworth head is for big turbos and big big power.

 

^^^^+1

That would be the biggest waste of money in the history of modding evos.

 

This would be like owning a ferrari and feeding it low octane gas. Why use such an expensive head with a worthless turbo? If you want to stick with the stock turbo, spend your money on other things (intake, exhaust, hotside, cams, boost controller, tuning, race gas, tuning, etc.). The cosworth head even on larger turbos really won't make much more power than the stock head (i.e. huge waste of freaking money)

 

You would get some gains with the head but not much. I ran a BR stag. 3 head on a stock turbo for a short period of time and the et's were pretty good (11.90's over two years ago was pretty fast for the stock 04 turbo) for the old stock 9.8 turbo. I would guess 10-15hp at the most on the stock turbo. You would be far better off using the money on a BR stage 4 package.

 

this would be worthless, unless you like how quickly your stock turbo spools up and want as much power as possible and a stealthy stock look.

I say go for it! And when you upgrade to a 20G-9 you'll really be rippin!

 

Thank you guys for your views. Presently my car set up are:

1) Ralliart intake pipe with HKS Super Flow filter
2) Ralliart Intercooler piping with Nisei Intercooler
3) Walbro Fuel pump, 1000cc fuel Injectors & Autronic ECU
4) HKS 264 Cams, HKS Cam gears, HKS valve springs & retainers
5) HPI turbo outlet, HPI 3" downpipe, Mines straight convertor and HKS Silent Hi-Power Exhaust
6) Stock Evo 8MR titanium 10.5 turbo

On the Dyno Dynamics, I am getting 292BHP & 416Nm at the wheels running at 1.65 bars with 98 Octane. My question here is what will be the gains like if I am going to upgrade to a Cosworth head. 10q

 

I doubt you would gain much.

 

Youre going to lose low end and midrange punch and get some minimal gains up top since you have the stock turbo.

Judging from your mods, you like to spend money on things you dont need, such as valve springs/retainers which are completely unnecessary with what you have. Also, 1000cc injectors are way overkill but I guess thats OK if you plan to upgrade in the future. Ralliart stuff... well... ya know.

Do yourself a favor and dont get the Cosworth head. You dont need it and you wont benefit from it. Your HP/per $ spent ratio will be .0025hp for $1.

 

I was also using HKS 264's at the time along with a mail-in flash from Dynoflash. I was able to get mid 114 mph out of the old 9.8 turbo. I still would think with your mods you are looking at 10-15hp gain. Just not worth it for $3600, thats $360/hp. Why not do a 20g and bigger cams?

I bolted on a BR3076r and went from 114mph on the stock turbo to 123mph on the 30r, thats close to 100hp gain at the crank for $3000. That seems like a much better option then the head.

 

You won't lose low end or midrange punch. You will make more power across the entire rpm band, and if you want to keep your quick stock spool-up and stock appearance, this is a good way to go.

If you want some info from someone with first-hand experience, call Buschur Racing and talk to them about their Stage 3 head.

 

that's funny, half the people saying this will then turn around and tell buschur his car is the most amazing thing on earth.

the fact is if you open up the engine the turbo will then be the choke point. but saying the above is like saying it's pointless to put cams on the car because it's well documented that as soon as you put cams on the boost will drop more at redline.

but the FACT is that if you want to have a small turbo set up and not lose the top end you MUST do everything in your power to boost up the top end. how do you think buschur is able to squeeze so much out of his car? he has every single top end mod on a car that shouldn't have it! he has a tb, the full staged head, the big boy cams.

THAT'S what this would be good for.

 

Id LOVE to see a ported head make more power below 4000rpm. Please show me. The only thing Ive seen from them is loss in torque low to mid and big gains up top.

 

wasn't curt browns 10.5 on stock turbo w/ a built head? just fyi

 

Listen, Im not saying a ported head is worthless... but look at this guys mod list. The Cosworth head should NOT be on his list. He can do a lot of other things instead of spending $3800 on something thats going to give him minimal gains.

Curt Brown's EVO is a drag car with fully built motor, sheetmetal, race gas, methanol and 30+psi. I think thats a different scenario.