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First dyno disappointed

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Old Jan 13, 2005 | 01:58 AM
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Thumbs down First dyno disappointed
i got a 2000 camaro ss m6 i dynoed at 307.34 hp adn 318.13 torque and my air/fuel ratio was 14.5 to 15 so it was running lean how do i fix that if i fix it will it give me more hp and torque gain
o2 sensors bad, bad cats, need tune up?
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Old Jan 13, 2005 | 05:46 AM
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tune,, i would get that shizzle scanned to see if you are throwing any codes.
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Old Jan 13, 2005 | 09:33 AM
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sounds to me like you have an air leak between the mass air and the intake...
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Old Jan 13, 2005 | 09:37 AM
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Originally Posted by zippy
sounds to me like you have an air leak between the mass air and the intake...
That sounds right...you almost have to be getting unmetered air into the engine somewhere. If that's not the case, then your O2 sensors are shot.
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Old Jan 13, 2005 | 10:00 AM
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Those dyno numbers seem right to me.
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Old Jan 13, 2005 | 10:06 AM
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The A/F is way off though...either their sensor was on the fritz or he has a serious problem. You're right though, the dyno numbers aren't all that bad.
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Old Jan 13, 2005 | 10:29 AM
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AF is suposet to be 14.7:1 how is this off? Most stock Z28's show a RWHP of about
297 so 307 for the SS is just about right for the claimed 10 hp increase over over the non ss versions. Besides just think how much money the mustang guy's have to put into their cars to get 307 RWHP
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Old Jan 13, 2005 | 11:08 AM
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Yeah, at part throttle closed loop its supposed to be 14.7:1, but not in open loop. When you floor it, like on a dyno run, it switches to open loop and uses power enrichment to shoot for a richer number so that you don't run lean. An afr of 12.7-13.0 is about what you want for a NA application. I'm sure he'd gain power after giving it more fuel.
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Old Jan 13, 2005 | 02:31 PM
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im just concerned about my a/f and if its robbing me of hp and torque
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Old Jan 13, 2005 | 02:33 PM
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Originally Posted by SLP4CamaroSS
im just concerned about my a/f and if its robbing me of hp and torque
Well, if you are getting unmetered air into the car, chances are it isn't idling too well. If it is idling okay, I'd check the O2 sensors next. There is still always the possibility that their wideband was screwed up. Those things don't last forever.
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Old Jan 13, 2005 | 02:51 PM
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they dynoed 4-5 other cars and there a/f ratio was on the dot
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Old Jan 13, 2005 | 03:34 PM
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Originally Posted by SLP4CamaroSS
they dynoed 4-5 other cars and there a/f ratio was on the dot
Okay...if the idle is okay, try swapping O2 sensors with someone.
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Old Jan 13, 2005 | 04:54 PM
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Originally Posted by SLP4CamaroSS
im just concerned about my a/f and if its robbing me of hp and torque
I'd be more concerned with leaning out and blowing up..
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Old Jan 13, 2005 | 05:04 PM
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Check out your 02's and for an air leak.
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Old Jan 13, 2005 | 07:42 PM
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Originally Posted by Got Me SOM
I'd be more concerned with leaning out and blowing up..
Couldn't have said it better myself.....


And as for those stating that those numbers are about right

I have owned 2 '99's and now own a '00 WS6 and all dynoed 320 RWHP/ 330 RWTQ or better with a LM and lid ONLY(no tune)......A/F 12.7-12.9 on a DynoJet

You will get better numbers when you cure this issue.
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Old Jan 19, 2005 | 12:25 PM
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Originally Posted by PewterZ28
Those dyno numbers seem right to me.
no they arn't my same year ss put doen 310 stock
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