t25 fully boosted misconception
 

ok, before I went turbo, I always thought that a t25 would be fully boosted at like 2800-3000 rpms, at least thats what everyone else says, but I have a t25 with 2.5" intercooling piping, and I START boosting at 2800-3000rpms, but I don't reach my 9 psi mark until like 5800-6000rpms, is that the same for everyone else?

Re:t25 fully boosted misconception
 

That doesn't sound right. I build boost at about 2900 and am full spool at 3400ish. I am running 8.5 psi on a Saab T348/42 which is similar in size to yours.

Re:t25 fully boosted misconception
 

im sorry pa2play but I dont remember what kind of an exhaust you have?

If you still have a stock exhaust, try running it without your cat and your exhaust. My setup was doing exactly what yours was doing before I dropped the exhaust and found out it was too small for turbo. Mine would start boosting about 3-4k but never reached full boost until 7-8k. But it reaches full boost by 4k. I know we have different engines but try dropping the exhaust and running it open downpipe and see if there is a difference...

Re:t25 fully boosted misconception
 

could you have an exhaust leak before the turbo?

Re:t25 fully boosted misconception
 

I'm running the greddy sp exhaust 2 1/4" with a high flow cat, which I'm taking out right now ;), as far as the exhaust leak b/f the turbo, on my hm manifold, there is the SMALLEST (I mean minsquel) hole on the back, like a pin hole, and the only reason I havn't fixed it is because I would have to take EVERYthing off to get to it.

Re:t25 fully boosted misconception
 

You could also try an MBC. That may help.

Re:t25 fully boosted misconception
 

WOW!Im running the same turbo and I dont see full boost till about4500 rpm or so.

And for the record a saab t3 is a little bigger than a t25.

Re:t25 fully boosted misconception
 

Uhm... if you have an exhaust leak... that could be it if your boost lag still persist after taking off the exhaust.

Re:t25 fully boosted misconception
 

check your wastegate too. If the flap isnt totally sealing, it will cause the turbo to spool later than it should.

Re:t25 fully boosted misconception
 

I'm in full boost basically whenever I am at WOT. on say a third gear run, I'll punch it at 2k and be fully boosted at 2.3k, and the boost will last till redline.

Re:t25 fully boosted misconception
 

what turbo are you using again bamboo?

Re:t25 fully boosted misconception
 

yea i have no trouble whatsoever spooling quick. im running a shirtbird log mani and a t3 .42/.48 and im hitting full boost(8lbs) around 3200-3400 rpms. full 2.25 charges, and 2.5 straight exhaust with nothing else.

Re:t25 fully boosted misconception
 

oh yeah, I'm on a DSM T25, 2.5" charge/down pipes and dsm 450's on VAFC.

Re:t25 fully boosted misconception
 

thats what it is, I remembered when I put the turbo on, if I opened and closed the wstegate by hand, sometimes it would stick open just a little bit, I thought that with the actuator, it would pull is shut easier though. Hum...any ideas on it. It almost like sticks open like 1/4 way.

Re:t25 fully boosted misconception
 

If your wastegate is slightly open that will kill your spool times.

Also, even a tiny ass exahsut leak pre-turbo will ---- up your spool time.

Fix that ----. :P
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Re:t25 fully boosted misconception
 

I have a small IHI, it started acting like yours, I would have to floor it and I'd be lucky to make full boost by redline, I went over all my bolts and found two of the four bolts that hold the turbo to the manifold just slightly loose, I tightened them up and it fixed my problem, so don't count out that small hole as the source of your problem.

I'm hitting full boost now by 3500 or so, and it holds it all the way to 7500.

Neil