TurboAv

iTrader: (6)

Just got the car back together today and I can't figure out the speedo on my 05 GTO. I am using a 30 tooth reluctor wheel and the computer is reading the correct speed. But the speedo is way off. About 22mph off at 65. We messed with all the values in HP Tuners and couldn't get it to change. From what I've been told the 04 GTO's are different than the 05-06 ones.

What is the trick?

9000th01ss

iTrader: (10)

Program it for the 40 tooth reluctor wheel. Never heard of a 30.

TurboAv

iTrader: (6)

We changed the VSS per rev and VSS per mile and that does indeed change what the computer is reading. That speed is correct according to my GPS. However the cluster is off. I don't know why.

TurboAv

iTrader: (6)

ttt, I need to get this figured out. My odometer is racking up the miles.

GNXClone

iTrader: (7)

Maybe ask Chris White over on ls1gto? He is the GTO dash cluster guru!

TurboAv

iTrader: (6)

Good idea. The only thing I can come up with right now is I need a 40 tooth reluctor and not a 30. So I'm going to order one from GM Partshouse. I wish it wasn't $80, so I hope it works.