Hey guys I own a 2000 Buick Regal GSE and stock my car has 225/60/R16 tires.
Well I got new 17" rims and General Exclaim UHP 245/45/R17 Tires.
I am not exactly sure what numbers I put into the Speedometer correction page in HP tuners.
This is currently what is in my car now:
My cars transmission has a 3.29 gear ratio and I must keep the sprocket ratio at 1.121 and calculated gear as 3.69 in HP tuners or I get an incorrect gear ratio error code.
As of right now everything works fine however I am not exactly sure what number I put in as the "New" tire size. According to the companies website my tire has an overall diameter of 25.7". Should I put 25.7" into the new tire size and also 3.69 as the gear ratio?
Also should I let it "Auto Scale Transmission tables" or keep that off?