Audi S4 Dyno Run - Stock vs PES chip
08-02-2001, 05:48 PM
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Audi S4 Dyno Run - Stock vs PES chip
Had a chance to dyno a 2001 S4 (tiptronic) today...stock chip boost (without fans directed at the intercoolers) was only 5.5psi....hp at the wheels was 154hp. With fans at the intercoolers (a better simulation of driving at speed), boost went to 6psi and power at the wheels to 170hp. With a PES chip, boost was 12.7psi, tons of fuel dumped in through the whole 2500-6000 range for added safety, and power went to 215hp at the wheels. Not a bad chip.
With an assumption of 25-30% loss through the A/T and drivetrain, power would have been around 300hp at the flywheel. Given the 95 degree temps today, this car will surely run stronger on a cooler day.
Stock chip runs lean (around 14.5-15.5 AFR....lambda is 14.7)...PES chip is on the rich side at 11.5-12 AFR. Gives strong results but more hp could probably be found by running 12-13 in the 2000-4000rpm range....the Porsche we tested on Tuesday picked up 30hp by leaning to these fuel levels. It's probably good to leave it rich in the 4000-5500 where it maxes torque and hp.
I'd love to do an independent comparison of all the popular chips on one of these cars someday. SD
PS- rear wheels showed to put down slightly more power than the fronts...not a 50/50 torque split. All runs were done in 4th gear/tip mode.
With an assumption of 25-30% loss through the A/T and drivetrain, power would have been around 300hp at the flywheel. Given the 95 degree temps today, this car will surely run stronger on a cooler day.
Stock chip runs lean (around 14.5-15.5 AFR....lambda is 14.7)...PES chip is on the rich side at 11.5-12 AFR. Gives strong results but more hp could probably be found by running 12-13 in the 2000-4000rpm range....the Porsche we tested on Tuesday picked up 30hp by leaning to these fuel levels. It's probably good to leave it rich in the 4000-5500 where it maxes torque and hp.
I'd love to do an independent comparison of all the popular chips on one of these cars someday. SD
PS- rear wheels showed to put down slightly more power than the fronts...not a 50/50 torque split. All runs were done in 4th gear/tip mode.
