Thread: s4's kinda pointless with t25...

The response of the t25 is all I want. Playing with V8's has made me very throttle response (TQ!) oriented

I hear that. My NX2000 T25 with SMIC would be in boost before the thought got from your brain to your foot. Switching to a FMIC diminished that a smidge, and when I went to a T28, I really missed the instaboost. Hoping that the 2560R that's going in to my SE-R will spool similar to that old T25.

C

the 2560r is an awesome turbo. It spools really quick. But after talking with a few guys about the power output of the t25 turbos, it makes me wish I lived at sea level. Quicker spooling and a lot more power. A t25 wouldn't come close to 300whp up here. Smog, and high elevation.

http://www.sr20-forum.com/turbo/11377-bc-stage-2-t25.html I lost some tq but I had bc stage 2

I dyno tested the BC stage 2 vs stock as well on a turbo application. It lost bottom end, but the peak gains were similar to the JWT S4. The S4 did awesome.

Same thing that happened to me.... In my case same tune, same boost level, lost tq but a good gain up top

Yeah my 18g was fun as hell on the highway and all....But pulling out into traffic in either a massive burnout or a bog waiting on 3500rpm got kinda annoying at times.

Also, Ashton i think something was wrong with the tuning on your T25 setup or something. I ran no wastegate hose for like 2 100deg 70% humidity mud butt NC summers with no issues. Motor ran fine and took all the abuse plus about another year of the 18g. My pistons on that motor are spotless. No detonation

Again, S4's dont help when you overpush a turbo and have high backpressure situations due to the increased overlap. Stock cams you can get away with that crap to an extent. Such as my buddies stock cam jdm de nx. Twice it had the hose to the wastegate blow off and spiked who knows what and held through the run. Only thing that gave it away was the now massive vac leak.

He didnt get away with it when he went to the t28 and the line popped off the mbc and hit probably 30 lbs on a t28, lol. Cracked ring lands on two pistons that time on a long run from 2nd into 5th gear against a nitrous s2000 (btw which he won) but the damage was done.

I wouldn't bother with anything more than a set of na sticks on a t25.

Also upgrading to a t28 can give more midrange and tq...

Ie a small fmic t28 running more boost than the t25 will produce much more midrange, tq and throttle response. E85 is the best mod for down low poer and it increases everywhere.

I am also wondering if welding up that internal gate would help as well.

I downgraded to a t25 from a 400whp turbo for a reason. This car is no longer my crack habbit and more of a second car just to tinker with. I dont think weldin the wastegate shut would do anything but decrease the value of the turbo when I go to sell it. Its not opening on its own and staying shut so its not really a problem. Thats one of the reason why I left the internal gate on even though Ive got an External gate. Just so I wouldnt have to weld it shut and just have the wastegate keep the flap shut.

Ashton, you and Gio got me to thinking now. If he was only running 17-18lbs to make that power then maybe I'm thinking about this too much and making it to difficult. I know the t25 over boosted with stock cams was making like mid 3's for tq at the spike. But that was at who knows what boost. If 17-18psi will get me there then thats not really putting that much stress on things and I can still get my tq. I dont know. Im gonna try it out a few different ways and see what I like. But im thinking that the stock cams will give me more of the down low grunt im looking for. Its almost like people here dont wanna match the cams to there turbos. They just want maximum peak numbers without worrying about the usable power they will have for daily driving.