Hardtop00SS

iTrader: (17)

I recently had my SS dynoed with my new heads cam combo, I put down only 385HP/357TQ, which seems really low to me, I was hoping for over 400 RW atleast. Granted it was almost 100* in the building. Mods are ARE Stage 3 ported heads, 2.05/1.57 valves, 10.9:1 CR, F13, LS6, MTI TB, ASP pulley, QTP LT's, Mufflex ORY, Mufflex 4" spintech single outlet, Moser 12 bolt, 4.10's with Denny's NR DS, tuning with HP Tuners. I've heard of guys losing power through the 12 bolts, how much are you losing? AFR was at 13.0 across the pull.

300bhp/ton

Are you M6 or auto?

Also what type of dyno was it? And where any correction factors used? If they where then outside temp should only have minimal affect on the actually final result.

A 12 bolt will zap some power due to increased roational mass, but in all honesty I think far too many people play this for more than it's worth.

Obvious things to check are how does the car run and drive? Have you had time to take it too the track yet? Are there any issues with the car (KR, miss-fire, etc.)

First off you need to establish IF the car is underperforming. Going to a different dyno and/or real world performance tests should highlight this.

If there still appears to be an issue then you need to track down what it is. A weak spark or lack of fuel, compression leak or installation issue.

Photochop

iTrader: (74)

If you've got an auto with a big convertor unlocked those are strong numbers...but still a little low....

GrannySShifting

iTrader: (10)

rear will account for 10-16 max for a dozen back to backs Ive done. I agree I think you should be at or above those numbers with stock heads even. Id look to the AREs first and mechanical problems

lilbuddy1587

iTrader: (1)

Them heads are a little too big for that motor. Also, I'm sure that mufflex is choking the motor. Even though it may be 4" they say it's one of the worst flowing catbacks(with the spintech OR flowmaster muffler). Also take into account your 12bolt with gears.

Hardtop00SS

iTrader: (17)

Thanks for the replies, it's an M6, the best I've had a the track is 12.27@116 with a 1.89 60ft with M/T ET street radials dead hooking. When I drive the car I feel like it doesn't have the power it should, I feel like it should have more. I have no KR, I logged all the dyno pulls and showed no KR. It was a Dynojet dyno, 300bhp, what do you mean by correction factors? Well when I talked to ARE about buying heads, they were the one that recommended the heads for my car, and I told what cam I was buying and they said that it would work fine with my car, and I also talked to futral back when I bought the cam and gave them the specs on my heads and they said that the cam would work fine with the heads, but of course they could just be telling me that to get my buisness, but I hope not.

jjgixxer

numbers dont' sound right at all.. Where getting 375 hp and 367 trq from cam only car, no heads,stock manifolds,stock ls1 intake just lid and loudmouth.. Do you have and dyno sheets you can show ?

slow trap

iTrader: (22)

you should be 410 + even with the 12 bolt and nitrous ds.i say get some different heads.

Hardtop00SS

iTrader: (17)

Here's the graph, maybe it has more in it, I have a few buddies that are going to help me tune it some more so I may squeeze out some more in it.

http://www.fastrides.com/photos/hard.../original.aspx

badpewter-z

iTrader: (4)

two things i see right away are that it peaks kinda early and should have it a little richer than 13.1a/f from what ive seen 12.5ish is where most n/a cars perform best .

the early peaking could be starvation or cam timing maybe.

also if you have the top quilty gas we have here (10% ethanol) that kills power too

Hardtop00SS

iTrader: (17)

so I should lean it out a little bit? I installed the cam and lined the timing marks up dot to dot and I didn't log my duty cycle, I will make a few more logs and see what my injector cycles are at.

badpewter-z

iTrader: (4)

no richen it up so it goes 12.5ish

Hardtop00SS

iTrader: (17)

yea we have the 10% ethanol, I didn't know you lose power with that.

Hardtop00SS

iTrader: (17)

yea that's what I meant, sorry about that

Hardtop00SS

iTrader: (17)

tuning question now, how much should I add to my PE table to richen it up a little?

lilbuddy1587

iTrader: (1)

IT'S NOT TUNED ? There's your problem......You can't skimp on the tune man, you just can't! You're asking for trouble AND are leaving a **** load on the table in terms of hp/tq with a setup like that!

Hardtop00SS

iTrader: (17)

so it's not completely untuned, it has had mutliple tunes on it, with the help of some friends. I'm going to fool with the tune a little more with it and see what happens, but I don't think I am going to get the #'s I hope for just by tuning it

slow trap

iTrader: (22)

what is your wot timing at in the 4500-6500 range.for a 224 can i thought it peaks at about the right rpm 4800 or so tq,6-6100 hp so i think it's timed right.

HAULNTA

I would say about 5 and 5 more if you make a gear change.

Hardtop00SS

iTrader: (17)

timing at 4600 is 28* and advanced to 33* at 6400