Are my posts making it? was Speedometer Scaling

[Mark Romans]

Hi Dave: You might try reading the eeprom data from a 6 speed car that came
with 3.45's to see what the values are in that calibration.
Mark
-----Original Message-----
From: Dave Plummer <davepl at MICROSOFT.com>
To: 'gmecm at diy-efi.org' <gmecm at diy-efi.org>
Date: Thursday, February 17, 2000 11:52 AM
Subject: Are my posts making it? was Speedometer Scaling


>I've posted this question a couple of times, and refusing to believe that
>no one here knows the answer, I'm curious as to whether my posts are
>actually making it to the list!
>
>---
>In the $EE PCM from my '94 Vette there are three values that contribute to
>the speedometer scaling.  With a 3.08 rear end and a 285-40ZR17 tire, they
>are:
>
>Speedometer Scaler:  25
>Speedometer Scaler Fraction: .984
>Scan Tool Speedometer Scaler: 41.5
>
>(These number are after massaging into some unknown units by TunerCat
>software).   Could someone summarize what these numbers mean in the real
>world, and how one would tweak them for a gear change to, say, 3.45:1?
>
>Thanks for any info!
>
>_ Dave
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