93 Lt1 speedo calibration
08-20-2004, 11:15 PM
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93 Lt1 speedo calibration
Any Lt1 guys know how to calibrate my speedo after a gear change to 3:73's? In tunercat I can adjust the road speed constant (pulses per mile) or the speedo vss pulse divisor. Which one should I change? Or will I need to do something else?
08-21-2004, 01:10 AM
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Car: 84 Z28
Engine: 355 (fastburn heads, LT4 HOT cam)
Transmission: 700R4
Axle/Gears: 9-bolt, 3.27
Disclaimer: Not speaking from actual LT1 experience here
It seems to me you would change the road speed constant. It looks like the speedo vs. pulse divisor adjusts the output to the speedo, based on teh road speed constant. If the source code was hacked, it would be ideal to look at which one uses the other one! One is going to use the other in it's calculation. Basically, the way it looks to me, the speedo vs. pulse is just a multiplier of the road speed constant.
HTH!
It seems to me you would change the road speed constant. It looks like the speedo vs. pulse divisor adjusts the output to the speedo, based on teh road speed constant. If the source code was hacked, it would be ideal to look at which one uses the other one! One is going to use the other in it's calculation. Basically, the way it looks to me, the speedo vs. pulse is just a multiplier of the road speed constant.
HTH!
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