t25 fully boosted misconception
07-24-2004, 10:12 AM
#1
1.0 BAR
Thread Starter
Join Date: Jan 2004
Posts: 585
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?
07-24-2004, 10:34 AM
#3
3.0 BAR
Join Date: Nov 2003
Posts: 2,200
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...
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...
07-24-2004, 11:09 AM
#5
1.0 BAR
Thread Starter
Join Date: Jan 2004
Posts: 585
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.
, 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.
07-24-2004, 11:39 AM
#7
3.0 BAR
Join Date: Jun 2003
Posts: 6,857
Re:t25 fully boosted misconception
Originally Posted by CSaddict
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.
And for the record a saab t3 is a little bigger than a t25.
