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Thread: Speedometer Change
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05-31-2008, 09:39 AM #1
- Join Date
- Jul 2005
- Location
- Pacific Beach //San Diego,Ca,U
- Posts
- 908
White with Black Top- 1999/ Z28
Speedometer Change
I had 4:10 installed on my M6 Z28 Camero and the Tire size was then 275x35x18 they changed my computer to the new gears.
I now put on New Rims and Tires ( 255x45ZRX17)
My question is how much is my speedometer off since I went to the the Rim and Tire size?
Any input would be greatly appreciated
Thanks in advance
Bruce/StoreKeeper99Z28
__________________
99Z28/M6/ Pro 5 and Lou's "Short Stick"/ AAP Custom Y Pipe 3"/ 4:10 Gears CMS/MMS Aggressor Cam 233/233/578/578/113 lsa/Mac Mid-Lenth Headers/Don lee Auto Ported Throttle Body and Ported LS6 Oil Pump/AAP 6.0L Heads/SLP Dual Cam Roller Chain/MMS Mike Morgan e-Tune,Dyno Tuning.
Dyno: Sept 9,2007
439 RWHP/398 Torque
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05-31-2008, 10:52 AM #2
- Join Date
- Apr 2008
- Location
- Orlando, FL
- Posts
- 48
- 2000 Z28
http://www.1010tires.com/TireSizeCal...mp;vehicle=yes
Let me know if that link works. If you put in your old tire/wheel size and new tire/wheel size, it will tell you the difference.
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05-31-2008, 12:42 PM #3
- Join Date
- Jul 2005
- Location
- Pacific Beach //San Diego,Ca,U
- Posts
- 908
White with Black Top- 1999/ Z28
Stock Tire - 275/35R18 >Search Tires Tire 1 - 255/45R17 >Search Tires
Section Width: 10.82 in 275 mm Section Width: 10.03 in 255 mm
Rim Diameter: 18 in 457.2 mm Rim Diameter: 17 in 431.8 mm
Rim Width Range: 9 - 11 in Rim Width Range: 8 - 9.5 in
Overall Diameter: 25.57 in 649.47 mm Overall Diameter: 26.03 in 661.16 mm
Sidewall Height: 3.78 in 96.012 mm Sidewall Height: 4.51 in 114.55 mm
Radius: 12.78 in 324.61 mm Radius: 13.01 in 330.45 mm
Circumference: 80.33 in 2040.3 mm Circumference: 81.77 in 2076.9 mm
Revs per Mile: 813.4 Revs per Mile: 799.0
Actual Speed: 60 mph 100 km/h Speedometer1: 58.9 mph 98.2 km/h
Speedometer Difference: - Speedometer Difference: 1.802% too slow
Diameter Difference: - Diameter Difference: 1.77%
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06-02-2008, 04:30 PM #4
- Join Date
- Apr 2008
- Location
- Orlando, FL
- Posts
- 48
- 2000 Z28
So your speedo is like 1.1mph off. Not even worth getting calibrated.
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