Justin@VMP
January 29th, 2008, 10:07 AM
One of my local friends and longtime customer picked up an 08 GT500. I needed a stock car to test the new C&L Intake on, so he brought it by at around 350 miles.
Even though this was done in December, it was a very poor day for air conditions. Baro was low, humidity was high, and temp was already over 80* in the shop by 9AM, that is Florida weather for you. So the numbers are correspondingly low, at all levels of modification (tuned and with intake).
Run1 is stock.
Run2 is with the C&L intake and VMP Tune, due to the poor conditions we only saw a gain of about 63RWHP. I did have one run come in at 496RWHP but the A/F was around 12.3 at the end, instead of 11.7 where I like it.
http://www.vmptuning.com/dynographs/jasoncnl2.jpg
The graph below further breaks down the power gains and shows how rich the C&L supplied MAF transfer function was, as further detailed in this article (http://www.vmptuning.com/forum/showthread.php?t=744). I would say that anyone running a canned Diablo tuner for the C&L is loosing out on a lot of power.
Run 2 below is with my tune on the stock intake, air fuel is in the high 11s. I've spent a considerable amoutn of time coming up with a good MAF xfer for the stock intake, as the factory xfer is very rich (sometimes in high 10s).
Run 3 is with the C&L intake and the C&L supplied transfer function, the car is running under 10.0 above 5000RPM. Hmm, thats the same very rich A/F that I saw on my car back in November when I tested the C&L and used their transfer function.
The C&L transfer function is so rich that the car did not pick up any horsepower with the C&L intake, it actually lost in some areas.
Run 6 is with the C&L Intake, VMP Tune, and a proper air fuel ratio (by adjusting the MAF xfer). Once I dialed in the A/F, the power gains were right where they should have been, actually a little bit higher than expected. I have been seeing 16RWHP from all the other aftermarket GT500 intakes, and saw 18RWHP in this case.
http://www.vmptuning.com/dynographs/jasoncnl.jpg
Even though this was done in December, it was a very poor day for air conditions. Baro was low, humidity was high, and temp was already over 80* in the shop by 9AM, that is Florida weather for you. So the numbers are correspondingly low, at all levels of modification (tuned and with intake).
Run1 is stock.
Run2 is with the C&L intake and VMP Tune, due to the poor conditions we only saw a gain of about 63RWHP. I did have one run come in at 496RWHP but the A/F was around 12.3 at the end, instead of 11.7 where I like it.
http://www.vmptuning.com/dynographs/jasoncnl2.jpg
The graph below further breaks down the power gains and shows how rich the C&L supplied MAF transfer function was, as further detailed in this article (http://www.vmptuning.com/forum/showthread.php?t=744). I would say that anyone running a canned Diablo tuner for the C&L is loosing out on a lot of power.
Run 2 below is with my tune on the stock intake, air fuel is in the high 11s. I've spent a considerable amoutn of time coming up with a good MAF xfer for the stock intake, as the factory xfer is very rich (sometimes in high 10s).
Run 3 is with the C&L intake and the C&L supplied transfer function, the car is running under 10.0 above 5000RPM. Hmm, thats the same very rich A/F that I saw on my car back in November when I tested the C&L and used their transfer function.
The C&L transfer function is so rich that the car did not pick up any horsepower with the C&L intake, it actually lost in some areas.
Run 6 is with the C&L Intake, VMP Tune, and a proper air fuel ratio (by adjusting the MAF xfer). Once I dialed in the A/F, the power gains were right where they should have been, actually a little bit higher than expected. I have been seeing 16RWHP from all the other aftermarket GT500 intakes, and saw 18RWHP in this case.
http://www.vmptuning.com/dynographs/jasoncnl.jpg