dyno results........these numbers seem weak - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-30-2008, 02:48 PM   #1
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Default dyno results........these numbers seem weak

209 fwhp @ 6150 rpm
241tq @ 3950 rpm
from 3750rpm on the a/f waas around 10.5
I know my numbers should be higher then this, so I need to find a way to tune this or if anyone has advice on what i can try, let me know. all feedback is welcome
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Old 04-30-2008, 02:50 PM   #2
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Default Re: dyno results........this is weak i need to know what to

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Originally Posted by lammers
209 fwhp @ 6150 rpm
241tq @ 3950 rpm
from 3750rpm on the a/f waas around 10.5
I know my numbers should be higher then this, so I need to find a way to tune this or if anyone has advice on what i can try, let me know. all feedback is welcome
Once I get my cable back we'll hook up and see what we can find.
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Old 04-30-2008, 03:15 PM   #3
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Thats pretty good numbers for your mods there. The tune might net another 5 to 10?
You need headers and rockers for your next jump
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Old 04-30-2008, 03:28 PM   #4
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Numbers look right for the mods to me as well.
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Old 04-30-2008, 03:38 PM   #5
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i would think they would be higher, that is over 30percent powerloss form the crank.... looking at the a/f ratio isn;t 10.5 way too rich?
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Old 04-30-2008, 04:53 PM   #6
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10.5 is a bit rich.

Depending on other mods to reduce KR I would run between 11:1 and 12:1.

I doubt being that rich is costing you more than 5hp.
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Old 04-30-2008, 05:13 PM   #7
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What kind of numbers were you expecting? How much hp and tq over stock do you expect your mods should be giving you?

IMO your mods should be giving you maybe 20 to 25 hp / tq over stock, and you are looking at maybe a 20% drivetrain loss right there...which is not too bad.

Lean that 10.5 AFR up some and you'll do better.
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Old 04-30-2008, 05:27 PM   #8
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Those numbers aren't bad, most S2 L67s dyno 190-200whp. 10.5 a/f is pretty rich and is going to hurt power I think the sweet spot for power and safety on the L67s is 11.8. A good tune should help you out quite a bit.

Ed
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Old 05-02-2008, 09:32 AM   #9
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with the mods i have i was thinking 25-30 over stock. for some reason i was thinking these engines produced 280 hp stock... This is where my nubers are bassed off, and this is why i am thinking that it was a terrible dyno result. sorry for the confusion. How do i go about tuning my car? what is the cheapest/best route to get it done?
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