SPRAYED 01

iTrader: (22)

My 3.5dp had to be beatened down alittle to fit the sway bar. Its not to bad but im having low hp issues on the dyno.

Comp 80/79 billet wheel,1.32ar 3.5 dp for about 3 feet then 3 inch then cutout.

With a forged 370ci 232/236 cam through a locked converter and 9 inch at 7lbs its only at 490whp and 545ftlbs. The main issue is that it peaks at 5100rpm.

Tuner thinks its may be a restriction in the turbo system.

SPRAYED 01

iTrader: (22)

At 11lbs it did 590whp but again around 5100rpm peak.

Nitroused383

iTrader: (10)

Post up the dyno sheet, was the cam properly degree'd in?

98Z28CobraKiller

iTrader: (17)

undo the Dp and see what happens.

Boo"SS"t

iTrader: (2)

I can't see how it could be choking it that bad, unless you're loosing 1/3 or more of the flowpath from that dent. Is your exhaust all the way to the back and thru a muffler or just dump at the bottom?

Sweet_SS

I seriously don't think that your DP is an issue. We tested the back pressure on my stock LS1 with a 3 " downpipe (no cut-out) on the TC78 with .96 a/r. on 8 psi and I flow all the way past 6000 rpm. Could be your muffler...it you have one

nastychevelle

iTrader: (7)

this.

SPRAYED 01

iTrader: (22)

I did not degree the cam, I installed dot to dot. Could this really move the peak hp down 1k rpm?

SPRAYED 01

iTrader: (22)

It does have a cutout but its right before the muffler in the 3 inch pipe, not in the 3.5 dp

stevieturbo

Post a picture, but IMO it would need to be nearly squashed to make such a difference.

98Z28CobraKiller

iTrader: (17)

So did you try taking the DP loose yet?

SPRAYED 01

iTrader: (22)

Not yet. Its at speed inc right now. They are going to tap in and check back pressure on the dyno.