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Old 02-26-2010, 10:39 PM   #1
Danny5
 
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Running too rich!

It took 9 dyno pulls to finally get a 370hp number, but every pull showed the same problem.

My car is definitely running too rich!

Same car on the same day ran almost perfect fuel numbers. But mine is running at 12:1. Its very frustrating.

Any theories? Bad O2 sensor maybe???

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Old 02-26-2010, 10:41 PM   #2
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Here is the same type of car (LS3) with same mods (muffler delete) on the same dyno, same day!

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Old 02-26-2010, 10:50 PM   #3
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I had 3 pulls on a Dyno jet , Bone stock and my first pull was 10.8:1 AFR and the second two picked up to 11.2:1 ! I think its just the random factory settings??? I made 380rwhp and 383 rwtq. Same dyno another stock LS-3 had 12.5:1 with 6 less hp and 8 less on the tq.
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Old 02-26-2010, 11:16 PM   #4
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I am not so concerned about the power difference as I am the AFR values. It sounds like your car is pretty similar...
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Old 02-27-2010, 04:59 AM   #5
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I think your AFR is fine. It's the other car I would worry about - leaner than 12.8 is dangerous.
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Old 02-27-2010, 05:10 AM   #6
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I don't like it when shops use the STD horsepower correction factor. That method artificially inflates measurements when temp is above 60 F. They did give you the ambient conditions. So, I would use the SAE HP correction method to get a more accurate indication of power produced.
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Old 02-27-2010, 05:56 AM   #7
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Old 02-28-2010, 08:23 AM   #8
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If the dyno was using a tail pipe sniffer, then I wouldn't believe anything the AFR shows at all.

Your factory O2 sensors won't really control wide open throttle fueling (however, there's a caveat to that).

Beyond all of that, though... if you're flogging the crap out of a car, it's going to start using Cat Overtemp Protection, dumping fuel to try and keep the cats from melting and breaking apart.

Last edited by DSteck; 02-28-2010 at 08:36 AM.
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Old 02-28-2010, 09:25 AM   #9
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Factory FWHP is rate at 426, you made 370 RWHP like most LS3 Camaro's do. With roughly 15% driveline loss that puts you right where you should be.
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Old 02-28-2010, 11:33 PM   #10
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Yes it was a tailpipe wideband. I am still running richer than any Camaro tested at this facility. I would trust the reading on a purely comparative basis.

I know my HP numbers are where they should be. Thank you for pointing that out. I would like to keep this thread OT and limit comments to people's experience with AFR on the V8s.

Thanks!
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Old 03-01-2010, 09:12 AM   #11
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Quote:
Originally Posted by 69lt1bird View Post
Factory FWHP is rate at 426, you made 370 RWHP like most LS3 Camaro's do. With roughly 15% driveline loss that puts you right where you should be.
Sorry bro, but FWHP?! Really? It's rated 426 HP at the 'Crank' aka the engine. There is no power being distributed to the front wheels as you said.
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Old 03-01-2010, 09:23 AM   #12
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Quote:
Originally Posted by Danny5 View Post
Yes it was a tailpipe wideband. I am still running richer than any Camaro tested at this facility. I would trust the reading on a purely comparative basis.

I know my HP numbers are where they should be. Thank you for pointing that out. I would like to keep this thread OT and limit comments to people's experience with AFR on the V8s.

Thanks!
I believe DSteck has already answered your question, I would put the cat over temp as my suspect as well.
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Old 03-01-2010, 09:29 AM   #13
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Quote:
Originally Posted by StlRomAniaN View Post
Sorry bro, but FWHP?! Really? It's rated 426 HP at the 'Crank' aka the engine. There is no power being distributed to the front wheels as you said.
FWHP = Flywheel Horse Power
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Old 03-01-2010, 06:30 PM   #14
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Hmn, flywheel horsepower I figured everyone knew that, Opps, I will explain it better next time.

I also have plenty of tuning experience, if 12:1 is the richest they have ever seen on that dyno, they haven't tuned many new Camaro's or that wideband is way off.
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Old 03-02-2010, 07:43 PM   #15
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12-1 isn't very rich.I shoot for 12.5-1 A/F while tuning these cars.
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Old 03-03-2010, 08:19 AM   #16
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12-1 isn't very rich.I shoot for 12.5-1 A/F while tuning these cars.
Same here. I find they make the most power at 12.5 and resist knock much better here too.
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Old 03-03-2010, 08:39 AM   #17
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Throw a CAI on there and see if it cleans it up. My car ran rich until I put on mine. But then it got tuned anyways.
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