North American Turbocoupe Organization

Odometer Calibration
WyldeSoul Offline
Upon installing my trip minder, I did a quick check, and found that the tripminder and the trip odometer were both EXACT in their calibration to eachother. Meaning, that when the trip odometer rolled over a tenth of a mile, within a second the trip minder showed another tenth of a mile. And that was after over 30 miles of operation, so they're pretty bleeding accurate.

The problem is, they're both inaccurate when compared to the road signs.

I stopped right next to one of those little blue signs by the side of the highway and set the trip minder to 0. Within 7 miles, it was more than a full tenth of a mile off.

Is that normal? It's only about a 2% error, but still. If it's not a normal margin of error, how would I calibrate it?
The Wench 1987 Turbocoupe. 5 speed. Black with Raven/Charcoal interior. Beater.
Mods: Cone filter, manual 2 stage boost controller (Gillis style), Thrush Glasspack (Pre-axle dump.)

Matt S Offline
Posting Freak
Considering the tripminder uses the same pulse signal from the sensor as the speedo, they better be exact! But otherwise I've noted similar readings as you with mine. I've chalked it up to not trusting those "check your mileage next 5 miles" signs. Mine's pretty mich dead on with roadside radars and speed between 40mph and 80mph. So I don't care.

If you go upping your fuel pressure the gallons used start to be behind actual usage also....
Sold it Sad*

Jeff K Offline
2% error is well within spec.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
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