jfrc2000

Car was running rich and had some idle issues after rebuild. Finally trailered it to a friends shop out of town to have it tuned. I was pretty disappointed in the results. It laid down 401/406.
382 stroker, 10.8 compression, balanced motor
LS6 intake, ported throttle body, vararam intake
stage 3 LS6 heads
TPIS headers, bassani Xpipe, stock cats
underdrive pulley
TR 224 cam (cant run much bigger due to race class)
4.10 gears

i figured it would be 430+

other than a monster cam, what should be the next mods?
my first idea is better headers and full 3" exhaust w/out cats
next i am considering 90mm throttle body and maybe ported LS2 intake

but an 03 Z06 went before me, with LG headers + exhaust, larger throttle body and intake and put down 340HP

Azrael

iTrader: (10)

Stingy dyno, the track is a better measure. But generally a bolt-on C5 Z06 is in the 375-385 range. So that would translate to your 430+ number.

evil02z

If it's an auto car. The trans/converter could be eating up some of the HP/TQ. Like Azrael the track will tell you if it's the car or the dyno.

jfrc2000

thanks, i was kinda disappointed when i saw the results

headers and 3" exhaust will be next mod, since i do not like my current one


also- it's not an auto. 6 spd with 4.10 gears

allngn_c5

iTrader: (3)

382 with 10.8 compression, hmmm. Could you mill those heads to bump that compression up. Get her to at least 11.3:1 or even 11.5:1 and you will be amazed at how much power you pick up. As far as a ported ls2 goes, why ?? How about just do it right the first time and pick up a used ported 90 combo, or buy a new ported 92 combo from Ron@Vengeance or Tony Mamo@AFR. Its a little pricey but you won't have to wonder if there is anything else to do as far as the intake. I'd also say stingy dyno too like others mentioned. A lot of c5z's with LG Pros and a tune make 370 to 390 rwhp, not 340. I think your track times will make you feel a lot better too if you can cut a good 60 time.