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Old 12-04-2000, 02:15 PM   #1
Bassem
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Member#: 305
Join Date: Sep 1999
Location: PA, USA
Post Speedo correction

is there a straightforward way to correct the speedo/mileage if you ise non-stock rolling diameter?

I'm asking, because i'm running the 18" p1 wheel/tire now, which are about 2.7% different in radius (and circumference) than the stock wheel/tire combo. i guess the difference is not all that whopping, but i was thinking, would a uk spec pickup help, or is it an ecu issue and i'm sol?

thanks,
bassem
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Old 12-04-2000, 08:00 PM   #2
wac
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Member#: 689
Join Date: Dec 1999
Chapter/Region: NESIC
Location: Lebanon, NH, USA
Vehicle:
2005 Outback 2.5 XT
Champagne Gold Opal

Post

As far as I know, it's a speed sensor issue rather than an ECU issue. The speed sensor sends a small sine wave to the speedo. Then the speedo converts it to run the needle and also sends a square wave version to the ECU.

A'PEXi sells a Rev/Speed meter http://www.apexi-usa.com/revspeedmeter.htm that can correct for wheel sizing. However, I think your speedo will still be off, since it is meant to be installed at the ECU and not the speed sensor.

Hope this helps,

-WaC
Wayne
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Old 12-04-2000, 08:13 PM   #3
tulit
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Location: Toronto
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09 STi
White

Post

I did a bit of experimenting with modifying the speed sensor signal to compensate for these errors. It works, but is somewhat complex and cumbersome.

I think it would be more effective to just modify the signal from the ECU to your dash unit.
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Old 12-04-2000, 08:14 PM   #4
tulit
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09 STi
White

Post

oops.

i forgot to get to my actual point.

The answer to your question is NO, at least not easily
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Old 12-05-2000, 06:09 AM   #5
Bassem
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Location: PA, USA
Post

well tulit, dont mean to be annoying...but what modifications can i do to the signal from the ecu?

thanks,
bassem
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