scorpion_z28

iTrader: (6)

Ok i've just finished modifying my car but im really disappointed from the result.
Here are the mods:
stock block,ported heads & intake, bigger valves, LE3 cam (24x/24x 60x/60x lsa is 10x), 1.6 RR, Moroso CAI, 58mm TB, Hooker shorties w/ 3inch custom exhaust,HSW Nitrous kit.
the car is an M6 w 3:73 gears.
The car made only 335hp/316tq w/out nos.
what could be the problem? the compression is fine & the car drives great with no issues.
could it be the shorties? any help is really appreciated.

OlMastaScrilla

iTrader: (3)

has it been tuned for all the upgrades?

z28rob18

iTrader: (7)

there's somethin wrong there man who ported the heads do you hav flow chart?

PNYKLR-TA

iTrader: (1)

who ported the heads?

and i wouldn't think the Shorties would hamper you that much, althought switching to long tubes on a setup like you've got listed i bet would be good for about another 15rwhp maybe 20 at most.

96redcamaro

iTrader: (1)

have you gotten it tuned after you did the heads and cam? who did the heads?

trippinholyman

try longtubes...you really need to open the exhaust up and let it breathe, otherwise that engine is being choked..

yeah and like everyone else, did you get it tuned?

also, did you spin the cam out to the top? if you shift below the top of the power curve, youll never make the big numbers.

crzytown69

iTrader: (17)

im with the rest long tubes """58mm TB""""<~ 58 mm throttle body????

PNYKLR-TA

iTrader: (1)

thats another good point, what RPM did you make that power at?

yea of coarse. what else would that be? haha

scorpion_z28

iTrader: (6)

The Heads have been done at a local shop & I've dyno tuned the car.I spin the cam up to 6500.

PNYKLR-TA

iTrader: (1)

well im gunna have to say that shop gone done fugged the heads up.

I bet i'm making near that power with an stalled A4, a cam half that size, and stock heads.

trippinholyman

well the biggest cam grind on elliott's site recommends you spin it to 6600, and if its a bigger custom grind you gotta spin it out higher, maybe 6700+ to make peak power.

did the shop give you a flow sheet?

z28rob18

iTrader: (7)

i agree i think the shop did a bad job on the heads

PNYKLR-TA

iTrader: (1)

but still he should be in the 370rwhp range at 6500rpms then maybe closer to 400rwhp at 6800 or even 7000rpms with a cam that large. If the heads were ported decently. He is M6 after all.

Also i noticed no one ever asked but what kinda dyno was it?

Maybe the dyno was reading severly low, take it to the track and get some track numbers, the dyno is only for tunning really, cause if you pull some crazy trap speed over 120 i'd say that dyno was just a low baller.

trippinholyman

yeah forgot to say dyno is worthless go to the track for real numbers! and yeah he should be making closer to 400 but (and i hope i'm wrong) but seems like those heads don't flow that good

scorpion_z28

iTrader: (6)

How can i know if the heads are bad?
This shop did Great job to alot of LS1s out here.im the first LT1 that he worked on.

96capricemgr

iTrader: (1)

A cam that size probably needs to go beyond the pcm's capability in such a small engine.

The heads are a complete unknown.

The Hookers are not great, if the exhaust is single 3" that is not very good.

3.73s wont hurt the HP number but are a bad match to the M6 and a big cam.

There is no plan here, just collection of parts.


That said I have seen chassis dynos spit out some retardedly low numbers for cars that performed very well so take it too the track and see if the performance is in line with the dyno numbers.

PNYKLR-TA

iTrader: (1)

OP:0 [ [slap, back hand, slap, backhand, slap] 96capricemgr:3.5

scorpion_z28

iTrader: (6)

Even if the Heads were done bad i should see results close to stock heads?
could it be something else other than bad heads job.

PNYKLR-TA

iTrader: (1)

do you have the dyno sheet to post up? that could possibly help a little.

scorpion_z28

iTrader: (6)

I'll post the dyno sheet tommoro, im working late hours today.