nice #! can you list the modes you've done top your car?
i think its my aftermarket bov, i could hold 20psi before but after i put the bov on i can't anymore. i'm gonna try a couple pulls on the street and see what happens, i know the dyno doesn't have the loading capabilities to sustain boost near redline. if i can't hold boost on the street either i'll just tighten the bov down a bit and see if that helps.Originally posted by Rviscosi:
<STRONG>Lester, my car has always done the same as yours boost wise. In 4th I can see up to 19psi for about a second and then the gauge snaps back down to 16 psi. I always here of stock twin cars holding 20 psi to redline in 4th and can't understand it. I don't think it matters much as the efficiency of our little twins go's away after 15-16 psi anyway.</STRONG>
My old car would get 23+ psi in 4th all the way to the redline (race gas). I had big exhaust and low miles, I don't know if that makes a difference.Originally posted by Rviscosi:
<STRONG>Lester, my car has always done the same as yours boost wise. In 4th I can see up to 19psi for about a second and then the gauge snaps back down to 16 psi. I always here of stock twin cars holding 20 psi to redline in 4th and can't understand it. I don't think it matters much as the efficiency of our little twins go's away after 15-16 psi anyway.</STRONG>
steve, thanks for the input. i'm probably getting a fuel controller next and do a little fuel tuning to see if i can help out my top end a bit. I also was told an exhaust side cam gear would help, so i may put one of those on too. hopefully it'll give me some more power up top because as it sits now, a civic could probably pull me on the top end.Originally posted by Steve Jarvis:
<STRONG>Basically the power on a BPU falls off because
1. The stock turbos can't hold more than 17psi (Approx.)of boost to redline
2. The stock fuel maps get very rich
3. The stock intercooler get heat soaked by the end of the run.
You have already addressed point 3. by installing an upgraded intercooler. You can help point 2. by installing an Apexi Super AFC and point number 1. is fixed with an SP63 or T66
We actually have almost identical corrected peak dyno #'s. I made 381rwhp and 413rwtq. The difference is that I have a SAFC and stock intercooler. Even though our peak #'s are almost the same I make 15 more rwhp and rwtq at 6,800 rpm. Typically an SAFC equiped Supra will make 50 more rwhp and 50 rwtq (@ 6800rpm) than a Supra without the SAFC so your front mount is definitely helping reduce the heat-soak. I bet you will be able to pick up 30 to 50 rwhp @ 6800rpm with the addition of a SAFC. I bet your peak number will also improve a little. You can see my dyno chart at www.geocities.com/steve_jarvis_me/Dynosmal.jpg As you can see I maintain a flat hp curve from 4600 to 6800rpm. I wish I had a flat torque curve but hey you take what you can get.
Hope this helps, Steve</STRONG>