Thread: Something more Serious then a T25

On the dyno in 4th it would build boost around 1,800 rpm. Normally you can count on boost by 2,000 or so. It gets up to full boost around 2,800 rpm or a bit later if you're running real high pressures.

Vadim, you asked how I made so much power without making torque.
It comes down to a few things. Running low boost overall helps. Running progressive boost a big part of it as well. I run 8 psi down low and it creeps up to 11 psi up top (not really on purpose but great for me). Then of course the unusually high flowing intake and exhaust help. This all means that while I do run low boost, I'm flowing a ton of air. Much more than most people. The high flow really comes into play up top where it shines. Down low it doesn't do too much and I have the torque numbers of someone running 8 psi. It's just that up top the engine flows tons and tons of air so 11 psi is way more air than usual. It's more like 16-18 psi for others.

So take that 16 psi that someone else is running to make 300 WHP. They are likely running that boost everywhere in the rpm range. So they are cramming 16 psi of boost down the engine at 3,000, 4,000 and 5,000 rpm where I'm only dealing with 8-11 psi. They make a lot more power at those rpms because of that. The inefficiency of their intake and exhaust hasn't really begun to be a problem yet at those air speeds so they make power. Then as soon as the rpms continue to rise the inefficiencies in the system really come out and they don't gain much air flow as they reach redline. This is in contrast to how my setup works where it's happy and most efficient much later on in the rpm range.

Edit: I forgot to mention, it's also possible that my mid-rpm tuning (timing) isn't as good as it could be.

what about a S15 BB T28?

I actually would love to have progressive boost that is ECU controlled. In that case I would definitely consider a Disco, run at very low boost first gear, higher in second, etc. etc.

Airflow makes sense, I'm looking into methods of increasing that as we speak .

I've noticed that when I was doing mid range tuning with timing, I yielded the most torque and just about 0 whp above what I had before. Mild mid-range tuning did get me 10 more ft-lbs on the dyno. It made the car feel great when first stepping on the gas. But that tune caused my O2 sensor to stick in Open Loop on the highway, thus dropping A/F ratios down to 13's. I returned to Calum's original tune for now, but plan on coming back to mid range tuning.

You shouldn't have many issues with the disco if you run low camber in the front, and utilize the boost by gear function. You should grip very very well. I know when I grip the car is a slingshot!

^I believe this is the turbo asthon talked about awhile back. If so, he seemed to like it at a lower boost than his old setup at a higher boost. He was ready to crank it back up though lol.

yes i did have the t25 and it was on at first since i have never been turbo but after a while it just got kind of boring and i got use to it..

i then got the gtir t28 and my car was like a whole diffrent little beast. the power felt good it hit hard and overal made me smile again. i have no idea how much power i have but it sure feels good to me..

if your going to upgrade go for the t28. you wont have to change injecters or anything else. and its pretty cheap. matter of fact i know somebody who has 2 gtir turbos for 350 each

I see, well I'll keep an eye out for a disco or 71r, but I'm not too worried about it yet, since most people on here are saying it wont be that much of a difference anyway hehe.

^^ no you won't, you know you want a Toyota Synergy Drive for your car!!

looks like the gtir turbo is taking the lead

Just by a tad bit