07-09-2009, 12:16 PM | #15 | |
PWA Relapse
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07-09-2009, 12:18 PM | #16 |
Okie doke
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It does look a bit weird. Was there any tuning done from the 1st pull to the 3rd pull? If not, the first one may just be an anomally. Taking a look at my stock dyno (Manual though), my A/F doesn't go below 11.4 and not above 11.9 stock. I wonder if the A/F ratio is the norm for the automatic cars.
I do think that the 15% loss your dyno guy said is a bit optomistic though as it seems the norm for the manual cars is 15 - 16 % .. IF an auto is 17% that would put you around 330 hp at the wheels if it is a little more than 17% then it would be a bit lower. Yours appears to be around 21 - 22 % though .. Keep us posted. Crowley
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07-09-2009, 12:20 PM | #17 |
Apprehensive Optimist
Drives: '10 SS/RS SIM Join Date: Sep 2008
Location: JAX
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Different dynos and other considerations...but I was really surprised by the #'s...
here's my 'stock' dyno...keep in mind mine is the LS3, but I still wouldn't expect at 70+hp variance....
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07-09-2009, 12:25 PM | #18 | |
Booooosted.
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07-09-2009, 12:26 PM | #19 | |
Iatefiberglassinsulation
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I agree with MTron that if the power is dragging it could possibly affect how the transmission is operating as well and compound the issue.
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07-09-2009, 12:26 PM | #20 |
Drives: never fast enough Join Date: Apr 2009
Location: CO
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You need to have someone who has dyno'd a stock automatic camaro look at that and compare to what they have seen. I have done lots of dyno pulls but not a camaro so not sure how they react. The a/f does seem very rich but i have heard from the factory they are down in the high 11 range. Also how did they dyno the car? lock it in one gear hopefully, and the same gear for each pull.
I wouldn't worry about the numbers being low or high, but the big difference in numbers from the first to the second is bothersome. They should be fairly consistent, but if i had to guess something is going on making it run pig rich. This also can have adverse affects as one run it will run properly then the next poorly as you got beat by a v6. Also a dyno only shows what the engine is doing. The tranny could be reading something funny as well causing it to be slow. A scan tool while making these runs is necessary to see what is all going on at WOT. A very experienced tuner could help you track these issues down. I would suggest someone that does a lot of corvette tuning could log dyno run's, or runs on the street for you and give you a much better idea of what is going on. |
07-09-2009, 12:27 PM | #21 |
Blessed
Drives: 2013 Sonic RS MT Join Date: Dec 2007
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Watching very closely....
I wonder if the dealer could interpret the A/F numbers for us?
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07-09-2009, 12:29 PM | #22 |
Drives: fanboys and ass kissers crazy. Join Date: May 2008
Location: Ottawa, Ontario
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97 degrees outside and 37% humidity? Have you considered fish gills? Your dyno numbers are fine.
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07-09-2009, 12:32 PM | #23 | |
Okie doke
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irpq11 do you have access to the SAE numbers? It is a little easier to compare across different dynos (although still shouldn't be comparied). SAE numbers should correct to a higher number. THanks, Crowley
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07-09-2009, 12:44 PM | #24 |
Budafinger
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I am going out on a limb here but I think there might be a problem with the stock air filter. It’s a little late now, but it would have been interesting to see if removing the air filter made any difference on the dyno. Maybe it’s running rich because it can’t pull enough air. SilverTurtle and I tested the stock 2010 Camaro Fram filter with an air compressor and it flowed less air than his DIRTY Fram filter from a 2002 LS1. This would affect the A6 cars more because of less direct control over RPM’s… Just a thought.
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07-09-2009, 12:57 PM | #25 | |||||
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Don't know what SAE numbers are. |
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07-09-2009, 12:59 PM | #26 |
Drives: fanboys and ass kissers crazy. Join Date: May 2008
Location: Ottawa, Ontario
Posts: 7,280
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At this point, it doesn't matter. You cannot make power in shitty air. My engine builder would never dyno a motor in those conditions. Now that I think about it, he'll probably be reading this.
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07-09-2009, 12:59 PM | #27 | |
Booooosted.
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07-09-2009, 01:07 PM | #28 |
Okie doke
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Thank God you don't live in Texas then .. in the summer that is pretty much what you get ... LOL
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