'93 speedometer off! Little help please.
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
'93 speedometer off! Little help please.
My dad purchased a '93 A4 about 2 months ago and just now put it on the road. The speedometer is off a bit. When doing 60 mph on the dash, the car is really doing 70 mph. The tires and wheels are stock size. No history was available on the car as to if the gears had been swapped. I told him to safely raise the rear, put in neutral, and turn the wheels one rotation and count drive shaft rotations. Since it is an automatic the stock gears must have been 2.59.
If the gears have been swapped how do you recalibrate the speedometer? I assume the speed sensor gears need to be swapped?? Where are they or it on the '93? Same as my '95? Any help is much appreciated, thanks.
If the gears have been swapped how do you recalibrate the speedometer? I assume the speed sensor gears need to be swapped?? Where are they or it on the '93? Same as my '95? Any help is much appreciated, thanks.
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Same spot as the speed sensor on your 95 but you must actually change the speedo gears on the 93, 95's can be calibrated with tuning software. Casethecorvetteman can help with that.
The "driven" gear on the 93 is easy to change, just remove one bolt holding the speed sensor into the transmission extension housing on the drivers side (10mm head) the gear just slides on or off the speed sensor shaft.
If you need more adjustment than you can get by changing the "driven" gear things get a little tougher. You will need to remove the driveshaft and transmission extension housing to change the "drive" gear on the transmission output shaft.
One of the forum members has a cool chart to match up the gears once you determine the current gear ratio and add the tire size.
http://webpages.charter.net/khasting...peedocalc.html
My apology for forgetting the correct member to credit, Corvettekid maybe?
The "driven" gear on the 93 is easy to change, just remove one bolt holding the speed sensor into the transmission extension housing on the drivers side (10mm head) the gear just slides on or off the speed sensor shaft.
If you need more adjustment than you can get by changing the "driven" gear things get a little tougher. You will need to remove the driveshaft and transmission extension housing to change the "drive" gear on the transmission output shaft.
One of the forum members has a cool chart to match up the gears once you determine the current gear ratio and add the tire size.
http://webpages.charter.net/khasting...peedocalc.html
My apology for forgetting the correct member to credit, Corvettekid maybe?
