Speedo calibration

[Dom]

Here are my stock values. Operating System 16245315

Engine PPM 49095
Trans Scalar 40.9004

PCM is programmed for 3.42s. Now I have 4.10s. Tire heigh is the same.

I have 3 boxes. All blank. I fill the first one with 25, second with 25. Do the values even matter since I want to keep them the same? And last box for gears with 4.1.

original

Engine PPM 49095
Trans Scalar 40.9004


I click save changes and it tells me

"Maximum engine PPM reached
Tire size adjusted."

The new tire box now says 8.14. Is that normal?

And new values are.

Engine PPM 65535
Trans Scalar 63.9990

So is this ok? Do I need to do anything more?

What's the scare transmission tables box for? I click it and the multiplier it shows is 1 so when I commit it doesn't do anything. Should I be manually changing this multiplier to something else? I see that it maxes out at 1.5. Values change as I'm putting in the numbder, but when I press commit it doesn't do anything. When I close the box and go back to it, the previous values are there again. Old and new are the same.
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I did it again with what I think is the stock tire ratios.

Old and new tire is 26.177
new gears 4.1

It adjusted the new tire again, but this time to 8.52.

For the scale trans multiplier do I just use 3.42/4.10?




Thanks and keep up the good work.

[Seppo_Kaitainen]

You have to change the ppm value by hand.

4.1 / 3.42 = 1.198......

Multiply the stock ppm value by that and it'll get you very close.

It will pop up a 'No tire size' warnning but will save the value you put in by hand.

[Dom]

Thanks.

What about the other two things. Trans Scalar and scale the transmission tables function.

[Seppo_Kaitainen]

I don't know about those, unfortunately. I don't think it matters w/ my car. Since mine is a manual.

[Keith@HPTuners]

The trans scalar is not used for the M5 transmission.

It is used on the A4's to convert trans rotations into MPH for accurate shift point values. In other words, when you change your gear or tire, to keep a 42mph WOT shift at 42mph, you must also modify the trans scalar. Our form should do this automatically. If you do not adjust the trans scalar as well, your 42mph WOT shift that shows up in the editor may actually happen at 45 or 37mph.