gatD281

Got my daughter's GTO tuned, it was pretty darn consistent then last weekend it varied a full second in teh 1/8 mile it wasn't every pass and I cannot get it to act up driving it around town.
Any advice, she said it shifts fine just feels really slow.
She deep stages and the 60ft times go from 1.98's to 2.10's but it isn't spinning.

Thanks,
Jeff

conexion914

iTrader: (5)

Hey, Jeff.

It's difficult to say exactly what it is without a way to log the car, but I'd check with the tuner.

I've raced with you guys before; my name is Chris, I have a Pewter Z28 with black wheels. I talked with you and Rob at OSW a few weekends ago.

I have HP Tuners and have tuned my own car. I'd be interested in what the Intake Air Temperatures (IAT) were on all of those passes; there are spark modifiers for IAT and Engine Coolant Temperature and those can move the timing up and down. If the timing was advanced any above stock in the new tune and the car experiences any knock, the PCM can pull timing out and slow the car down as well.

Is it a 5.7, or a 6.0? If it's a 6.0 it might be worth looking into relocating the IAT sensor away from the MAF housing.

Let me know if I can help out.

MrGame

I bracket race a GTO, and my car has been deadly consistent over the past year since I figured out the suspension. It's not easy to do, but these cars can run great! What does the car have done to it aside from the tune? Suspension can lead to extreme inconsistency because 1.98-2.10 is a huge swing and each .01 can make a difference of .02 or more. Beyond that, what temperatures are you running going into the water box? It's important to make sure that they're the same every single time, down to the degree.

JL ws-6

iTrader: (50)