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New Numbers....need opinions

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Old Nov 5, 2007 | 05:12 PM
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Default New Numbers....need opinions

Hey guys,

took my GTO in again this morning, results are better than my last go around, wound up with 667.9 HP @ 5,445 rpm and 702 lb TQ @ 4,627 RPM. However still have my HP curve flatten out at 5500 rpm?

I am very happy with the torque.....lotsa fun around town!!

I am guessing I have found the limts of shortie headers, catted midpipes, and a single corsa 3" catback....

Take a look at my sig, and the graph and give me your opinions....

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Old Nov 5, 2007 | 06:55 PM
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It's crying for more exhaust, and the cam could be slightly too small. A 224 lobe in a 408 should peak out in the high 5K range.

Dougie
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Old Nov 5, 2007 | 07:25 PM
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Originally Posted by gtodoug
It's crying for more exhaust, and the cam could be slightly too small. A 224 lobe in a 408 should peak out in the high 5K range.

Dougie
Hey Guy...long time no hear?

that is my guess as well, I keep remembering your thread when you took the corsa off your car and picked up 12 HP or 18 I forget??? But since I don't have LT's and I do have Catted midpipes I think I have a serious backpressure issue.
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Old Nov 5, 2007 | 07:43 PM
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Are these numbers with the P1SC or the F1? Either way great #'s man! I would have to agree with GTOdoug that with your cubes your combo is maxed out before 6k with your cam selection. Upgrade the exhaust to some LT's and an ORY and pull it again!!
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Old Nov 5, 2007 | 08:06 PM
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Originally Posted by 01 MidMet WS6
Are these numbers with the P1SC or the F1? Either way great #'s man! !!
P1SC-1..

Was going to put the F1C on, but If I can't flow what the P1 is putting out, seems somewhat pointless at the moment...
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Old Nov 6, 2007 | 12:10 AM
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I never learn. I just picked up 15whp with cutous open on my 402 powered Vette. Open the exhaust, it will be worth some ponies, but you'll need to change the cam if you want more usable rpm. Get ready to change the head unit after that.........it never stops does it?

dougie
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