PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

getting speedo to work with th400

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Old Aug 21, 2008 | 09:10 PM
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Default getting speedo to work with th400

I know there are write ups in here somewhere but search didn't find them. What do we have to change in hp tuners to get the speedo to read accuratly. By the way I have all the sensors and wiring already just need to tune it
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Old Aug 21, 2008 | 09:44 PM
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Originally Posted by 1_bad_ss
I know there are write ups in here somewhere but search didn't find them. What do we have to change in hp tuners to get the speedo to read accuratly. By the way I have all the sensors and wiring already just need to tune it
Thanks
Look at the pic below, in the red circle enter the number of teeth on your reluctor wheel.
And obviously make sure your tire size and gear ratio are correct.

Last edited by 9000th01ss; Oct 13, 2008 at 10:56 PM.
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Old Aug 21, 2008 | 10:38 PM
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How many teeth are on the wheel for the gm part to go in a turbo 400 trans to make it work anyone know? Also I thought you had to multiply something by 2.5
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Old Aug 21, 2008 | 11:06 PM
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I got 40 teeth on my A4 car. You need to count yours, I'm pretty sure it's 40 also.
Not sure about the 2.5 thing.
I swapped one car from an M6 to an A4 and just changed the reluctor wheel tooth count in that circle.

Ok I forgot how I did it. I put reluctor wheel tooth count in the correct spot just now with a random bin file and nothing else changed, I thought it auto scaled, but it doesn't.
You should be able to copy and paste the other numbers from an A4 file.

Last edited by 9000th01ss; Aug 21, 2008 at 11:34 PM.
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Old Aug 23, 2008 | 02:06 PM
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Any other help for this
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Old Aug 23, 2008 | 05:05 PM
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What are you working on, like very specific.
What transmission did you take out?
Whats your speedo table look like?
If you took out a 4L60E and put a th400 in it with a 40 tooth reluctor whell you shouldn't have to change anything.
If you took an M6 out you need to find a speedo table (or use the one I posted above) and copy/paste all the numbers over. Then if your rear gear or tire size has changed put the new sizes in and hit the commit button.

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