Justin@VMP
September 5th, 2007, 08:48 PM
Bill is my original and first GT500 customer. He first brought his car to me back in September of 2006 on the recomendation of a mutual friend. I've had his car on my dyno several times to test different combinations.
He brought his car to me on a cold December morning back in 2006, we had some outstanding results from just a VMP Custom Tune.
Whenever you are testing these cars a baseline needs to be done, because power #s vary from day to day depending on air temp and barometric pressure, you've got to figure that at the 500rwhp level a tiny 1-2% difference adds up to 5-10 RWHP.
The car put down 460RWHP stock, due to the 60* air and high barometric pressure.
After I did some tuning the car made 497 at the tires! almost the magic 500 mark, but at the wheels not the crank!
Why only a 37RWHP gain? these cars are very finicky, if you baseline with a high stock number, there is only so much that can be done with timing and A/F to make more power. The factory tables are set up to drastically adjust timing based on post intercooler air temp, and that is why we see such a large swing in stock power numbers. I'll be making a post on this later.
http://vmptuning.com/dynographs/bill497tuneonly.jpg
He brought his car to me on a cold December morning back in 2006, we had some outstanding results from just a VMP Custom Tune.
Whenever you are testing these cars a baseline needs to be done, because power #s vary from day to day depending on air temp and barometric pressure, you've got to figure that at the 500rwhp level a tiny 1-2% difference adds up to 5-10 RWHP.
The car put down 460RWHP stock, due to the 60* air and high barometric pressure.
After I did some tuning the car made 497 at the tires! almost the magic 500 mark, but at the wheels not the crank!
Why only a 37RWHP gain? these cars are very finicky, if you baseline with a high stock number, there is only so much that can be done with timing and A/F to make more power. The factory tables are set up to drastically adjust timing based on post intercooler air temp, and that is why we see such a large swing in stock power numbers. I'll be making a post on this later.
http://vmptuning.com/dynographs/bill497tuneonly.jpg