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Discussion Starter · #1 ·
Looking for anyone with a contact or experience using either HPT or TC to correct the speedometer on 4.56 rear axle.

My dyno tuner can't figure out how to correct for the change. Thanks.
 

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Blown 2003 No. 2924
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982 Posts
When I changed my gearing from 3.73 to 4.11 I went a couple of months before getting the tune changed to accommodate the differences in gearing. I used a speedometer app on my phone and found a 10% difference between what the SSR speedo was reading and what the app indicated. 10% is also the difference between 3.73 and 4.11. The difference between 3.73 and 4.56 is 22%. Not knowing how those programs compensate for the differences I’m just wondering if adjusting some other constant by 22% would work. If that’s of no use to your tuner then perhaps a call Joe DeLano at Left Coast 32 is in order. Joe is very adept at the nuances of the HP Tuners product and a friend of the SSR community.
 

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Thanks, I will.have my guy reach out to Joe.
Joe, can't do the correction as HP Tuners doesn't have the capability. You need someone that uses LS2 Edit software.
I bumped a thread about gear changes that has the needed info in it.
 

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2006
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752 Posts
HP Tuners seem to have improved 4.56 gear adjustments.

Joe, can't do the correction as HP Tuners doesn't have the capability. You need someone that uses LS2 Edit software.
I bumped a thread about gear changes that has the needed info in it.
I think HP Tuners has made some improvements in the last few years. After I installed my Gear Vendors and went up a size on the rear tires, I made a few minor tweaks to the Speedo settings. In the past that was not possible with HP Tuners, (and 4.56 gears) but this time it worked. That update was in 2015.
 
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