Went to the dyno the other day with my tuner. We were going to crank up the boost since I put in some 1000's and a boost controller. About an hour into the tuning session we got 360whp @14psi on a built b16, ITR cams, T70 turbo, Top Mount manifold, 4" downpipe straight to the ground. As we went to crank the boost up to 16-17psi and made 2 more pulls the numbers didnt change at all. We tried pulling timing on a pull then tried adding timing on another, but nothing changed. Me and my tuner were both stumped on why it decided to stop there when it had plenty more in it. I check and felt around on my couplers and on my manifold for any leaks but didnt see anything. Im still puzzled on what it could be.

This was also on a Dynojet that 98%+ used by mustangs and it didnt do a very good job picking up my rpm signal and I got no torque readings also was 94 degree out.

*UPDATE*
Pressure tested my charge piping at 30psi and I found a few small holes. Found 2 around the bov flange, another 2 right after the turbo on one of the charge pipe welds. Then I found the real problem 2 holes the size of headphone jacks that felt like I was blowing an airchuck into my hand. This explains why I would crank up the boost and no power was made because it was all leaking out before actually getting to the motor.


Modified by slotec at 9:30 PM 7/28/2008

 

get an exhaust on that downpipe, its probably shooting exhaust under your engine bay, and its just sucking up the hot air back in.

 

thought about that too

 

what psi wastegate spring u have in there?

 

its a 14psi sping on a tial 40mm wastegate. Car use to spike just off the wastegate to 17-18psi then with the boost controller hooked up and turned completely down it hit right at 14