Originally Posted by Alberto

HA-the revup lower plenum sucked huge donkey d!ck. I thought more volume in the plenum + boost = more power. Hell no. Semi-tuned with the revup it wouldnt do much past 365whp, and the power dropped off DRAMATICALLY. At 6200rpm's I was at 365whp, by 6600rpm's it had dropped to 295-300whp!! Crazy how fast the power fell. And my TQ and power under peak was down. I swapped back to stock before finishing the tune, much better Now even at 6600rpm's I am above 360whp...

So, I wouldnt recommend it to anybody. Another member had a similar experience with the rev-up plenum on his 287 FI motor.

Originally Posted by BlackTuner

That is interesting you say that, the 05 lower plenum change my whole power curve. Essentially taking it from a peaky 290 to 300whp plot to a nice and flat 285whp from 6200 to 7300 rpms. I am running an APS Plenum with the 05 lower plenum. Unfortunately my enthusiasm is growing old on this project to see what it will do with the tomei cams and valvetrain under my desk. In theory the shorter runners on the 05 should allow you to make more power at higher rpms.

Jermaine@turboxs.com

Originally Posted by Alberto

HA-the revup lower plenum sucked huge donkey d!ck. I thought more volume in the plenum + boost = more power. Hell no. Semi-tuned with the revup it wouldnt do much past 365whp, and the power dropped off DRAMATICALLY. At 6200rpm's I was at 365whp, by 6600rpm's it had dropped to 295-300whp!! Crazy how fast the power fell. And my TQ and power under peak was down. I swapped back to stock before finishing the tune, much better Now even at 6600rpm's I am above 360whp...

So, I wouldnt recommend it to anybody. Another member had a similar experience with the rev-up plenum on his 287 FI motor.

Originally Posted by Slick 6MT

Did you ever get back to the dyno with higher boost/race gas pulls?