Speedometer recalibration?
03-21-2012, 10:46 PM
#1
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Join Date: Jul 2003
Location: Valdosta, GA
Posts: 206
Speedometer recalibration?
I have a 1997 Pontiac Firebird 3.8L M5 with a Y87 rearend that I installed. Stock gearing ratio was 3.23, now its 3.42's. How do I go about recalibrating the speedometer so that it's correct? What are my options? I read that you can use a Hpertech Pro tuner but I cannot find one, not even on their website. I also found PCMforless which charges $150.00 to flash the pcm. Any other options or does anyone know where I can find a hptuner to correct my speedometer?
03-22-2012, 01:37 AM
#2
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Join Date: Aug 1999
Location: I'm in the Bay, Trick
Posts: 1,150
Re: Speedometer recalibration?
If you plan on doing some other modding, go the PCMforLess route as they can factor all that in when they tune a new PCM.
I did that when I put on headers, LSD & new rear gears. Worked like a charm.
I did that when I put on headers, LSD & new rear gears. Worked like a charm.
03-22-2012, 07:31 AM
#3
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Join Date: Jun 2006
Location: upstate New York
Posts: 439
Re: Speedometer recalibration?
Yes, you need to re-program your PCM. A decent speed shop, that tunes these cars could probably do if for you more cheaply than buying a Hypertech. You can also have it calibrated for non-stock sized tires.
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