Quote:
Originally Posted by Nick S
I looked at a 2010 Camaro tune I had downloaded a while ago. It was for a manual LS3. It looks like the car primarily uses the wheel speed sensors for MPH. It appears that the trans output speed it used as a secondary check to make sure the wheel speed sensors are working properly and if one of the VSS is not working properly then it can use the trans output speed as a back up method. So I am thinking the speedometer may still read correctly but it will probably still throw an SES code because the error between the two readings would be too high. Plus for an automatic you would would want the tune so your shift points are recalibrated properly since the I believe the newer auto trans uses RPM and Vehicle speed thresholds for the shift points.
So I guess in the end I agree that for an Auto a tune would definitely be needed. For a manual you could probably get by but it wouldn't be optimal and a tune would still be highly adviseable.
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precisely.
a change in tire diameter will screw it up on manuals and autos alike, though.