i have a 92 jdm h22a with 40,000 miles in a 95 civic coupe. im currently running hondata s300 p72 ecu. im thinking about running a dsm t25 turbo and drop my compression to 9:1 with a thicker headgasket from cometic. i wonder if i could get away with running 14psi on a safe a/f ratio and make it last???

 

the t25 is too small for the H22

 

my stock head h22 turbo with 9:1cr made 300 on 93 gas with 10psi

 

on a T25...???

 

You could do a "big" t28. I know a guy that does upgrades for about $380. You can get stock t25's in great condition for $free depending on who you know, or if you can swipe parts from junkyards. Send it in and have them upgrade to a beefier shaft, bigger compressor and turbine wheels with matched housings. It comes out comparable to a td04 19t. The exhaust housing is slightly bigger than a 19t, but a 19t is kind of small at like .49 a/r...that's the downside i see. The big t28 is good for about 340hp and cheaper than some new turbos.

Or you can just do a t3 or t3/to4e like everyone else lol.

 

I agree. Our engines don't flow like crap so something that works on a DSM, which flows like crap, will not work as well on our cars. A DSM turbo (other than maybe the Evo 8/9 16g) will boost immediately and choke out soon after. If you were boosting a D series, this would be a good choice

Was this using a T25..? Otherwise, thanks for the irrelevant comment...

 

sorry i had to chuckle lol

 

well my buddie has a t25 with shaftplay he said it would cost no more than 50 bucks to fix. so i figured i would try the t25 and boost 20lbs. and drop my compression with a thicker headgasket. id think it would make 250-300hp?? i dont wanna put a big turbo on and have it blow my rings up.

 

No. you may still blow it up. 20psi has to have different wastegate actuator installed (yes, even with a boost controller), and basically at that level you will not make any more than about 200whp or so. 20psi on that turbo is just blowing hot - detonating inducing air. You could pray over it to make 300 and it won't happen.

Just because it was "free" doesn't mean its to be used. the integration of that DSM T25 onto a manifold alone isn't worth the trouble.

Do yourself a favor. Save a little cash, get a standard 270 degree bearing garrett turbo for under 700whp, some engine mangement (doesn't even have to be Hondata), some injectors of good size, and then you're in a better position to not blow it up. Doing it this way will just INCREASE your chance of messing up your engine.

 

Ya at 20psi on a t25, you're out of that turbos efficiency. That's why I suggested sending it in for a big t28 upgrad and rebuild if you need it, which i guess you do.

 

well im gonna be using 450cc dsm injectors, i have 255lph walboro fuel pump. thicker cometic headgasket (lower comp), aem fuel rail, i have a nice custom turbo header, hondata s300 on a p72 ecu, aem ugeo a/f ratio gauge wide band o2, aem turbo boost controller, and a t3/t4 turbo. thanks guys for the help.

 

If you plan to stay stock internals, I'd at least get some better chromoly piston rings while you're putting on a new head gasket. Rod bolts & head studs would be great, too. Get some 550 injectors incase you want to raise the boost level later. Why spend money on 2 sets of injectors when the 550s will work just fine. If you're going above 10psi of boost, the rings will be the first things to go within a year if you push the car hard.

 

I wouldn't do piston rings unless your planning on honing the cylinders. I would also talk to your tuner about the headgasket. 1) Some ppl have problems with cosmetic headgaskets. 2) It's not the best way to prevent knock. Your tuner might suggest using another method like a bigger injector or something.

ARP headbolts are not a bad idea though.

 

no on a t57

 

Leave the rings...there is no reason to tear the engine apart to replace such a menial part. If you're going to pull it apart, upgrade more than that, but for your goals a stock engine in stock form will work just fine. By the way, the "upgrade" to a larger fuel rail is wasting money. Unless you're doing it for looks, there is no reason to change from stock. The OEM rail will flow more than enough fuel for your needs.

 

Ya, I remember looking into the fuel rail in the past for my turbo accord. The port wasn't large enough to support its cost, especially for a stock motor. I wouldn't have even come close to maxing out my stock rail.