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May I ask for some turbo advice? I am currently running a gt2871r and I'm seeing 300whp peak at 20psi. If I get a gtx2867 gen2 supercore and slap it on my exhaust housing what gain other than a better spool will i see? Could it reach 350 at the wheels? We don't have e85 here so I run 100RON which is like 93 octane I think.
A little update. Purchased a kunugawa gtx wheel for the good ol' gt2871r. It's 58 trim and has extended tips so we'll see a before and after dyno in a month or so.Hopefully this will be helpful for someone looking for a budget turbo upgrade.
Actually this is a gtx2871 wheel. Isn't that a bit optimistic for pump gas? The highest we have here is 100RON which is like 93 octane i think and the most I made on it is 310 on a dynapack.
I was making over 330 wheel horsepower on a first generation GTX2867R at 19psi. Actually, I'm running 21psi now and am limited by things other than the turbo for going up from there. This is on pump 93 octane.
The engine is a bp4w with stock head and cams, forged short block with 9:1 CP gt2871r turbo. It still had the vics manifold at the time of the dyno, kraken top mount manifold, 640cc mustang injectors.
Now I changed to 980cc injectors, volvo valve springs and a kraken low mount and I have yet to fit the gtx wheel and visit the dyno.
Ahha, I see now. 19T as well, but seems you didn't manage to get any more power out of it. I was hoping to eventual get to 270-280 at the wheels, but doesn't look like it will.
I do know what goes into the 19T upgrade, we did it on my friend's TD05H-15G, but that's a totally different turbo.
Dotted lines are before with the original gt2871 comp. wheel and not ported exhaust housing.
Finally have results. I'm quite happy with the gain. Keep in mind that the old run was made in november in colder outside temp. It does reach peak boost 500rpm later but power doesn't fall off as much as before.
Figured i share my trans solution. Getrag 260 from an old bmw, e60 530d pressure plate, Kmiata flywheel and adapter and a locally made driveshaft. Everything else made by me
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Happy new year!
This year should be very interesting. Ever since I built the engine 2 years ago I have always regretted that I didn't touch the cylinder head so I bought a used head to have a go at porting.
Looking at photos from supemiata cnc head I have decided to go easy on the intake ports and use only sandpaper rolls from 80 to 400 grit to get them as smooth as possible and to go a bit more aggressive on the exhaust ports by smoothing out the bulges that the valve guides stick out and knife edging the dividers. Hopefully I don't slow the exhaust gasses too much but we will find out . Also purchased a set of std size supertech hi flo intake and exhaust valves if there is something to be gained there as well. It will be interesting to see how these changes will affect power and spool. I plan to swap the heads first to take datalogs and then to change the china cooler with a garrett core and fabricate end tanks and move to a larger turbo. So far I am still porting the head and have yet to take it to a machine shop to do the valves skimming etc. Any advice is very welcomed. Intake Exhaust
Update time. I've done a few things to the car this year. Added a setrab oil cooler and a garrett intercooler core and made ducting for both of them.
I also had a go at making an intake manifold. It's a dual plenum like the one that HF-mx5t made for his awesome build. He was really helpful along the process. Super cool dude he is.
Slowly paving the way for making some good power.
09-13-2019, 05:01 PM
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