I've read a few threads on the speedo calc but I still don't get it.
The car is a 2000 LS1 Corvette with manual transmission and 3.42 differential (H0103).
Stock rear tire = 275-40-18. When I plug that into the calculator it comes up with:
H0101 = 18802 (edit: fixed previous number what was in the wrong units)
H0102 = 11.70
When reading the stock tune it shows:
H0101 = 19280
H0102 = 40
My current dyno tune shows:
H0101 = 19884
H0102 = 40
Are these just minor tweaks to fine tune the speedo? The dyno tune is off the stock tune by over 5%. I'm thinking the tuner just copied / pasted from another cars tune and missed that the other car had different size tires.
I'm changing the rear tires to 305-35-18, the calculator indicates:
H0101 = 18984
H0102 = 40
Should I just start with 18984 and adjust according to my GPS at highway speed?
What is the calculation performed by the calculator?
Thanks!