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Yes, too much
Posted by Robert Davis (more from Robert Davis) on Tue, 6 Mar 2001 08:47:20
In Reply to: Quick Survey - Speedometer Error, Aaron Gilbert, Mon, 5 Mar 2001 15:03:46
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>> For years, many people have been reporting to me as much as a 10 MPH error on the 9000 when traveling at freeway speeds (reading high).
I've had five Saabs (3 9K's) and only my '95 Aero has shown any significant speedo error (~6% fast). It aggravates the hell out of me, as I'm constantly figuring in my head, "Now if I want to really go 65...94% of 65 is...." I sometimes feel I need to carry a calculator in the car.
>> ...mileage markers on the freeway and a stopwatch), and was shocked to see that I was going about 60 mph when my speedo indicated 66 mph.
Mileage markers are usually close, but I wouldn't trust them on a short-run test, as you may run into one or a series that are incorrectly spaced. IOW, check it every mile for 20 miles with a stopwatch.
>> Oh, and when I measured the 3% error at 60 mph, my car had the automatic transmission.
So it now has a 5-speed? If so, that is likely your problem. Speedo gears are calculated for car models, specifically for wheel/tire sizes. If you installed a 5-speed in your car it likely has the wrong speedo gear for it. After much general yet diluted discussion here, I have yet to figure out what is involved in changing the speedo gear on a transaxle.
Even then you'd be guessing, unless you found the specific gear for your car.
>> I believe the wider wheel stretches the tire slightly, and decreases the overall rolling diameter slightly, but to the tune of 7% ???
No.
>> Does anyone else think that a 10% speedo error is a bit much?
Yes. That would aggravate the hell out of me, but at least it's easier to figure the correct speed with a 10% error than 6% like I have.
You could try going to a larger tire and wheel size to compensate somewhat. An Aero or Super Aero wheel would allow placing 205-55-16 tires on your car, which by my calculation would lower your error by 4%, only a partial success.
If it turns out that changing the speedo gear is easy and a number of different gears are available from, trial and error might be the way to go here. Your '87 may be a cable-driven speedometer, yet I think my '95 is electronic, so I don't know how both are driven in the transaxle.
Posts in this Thread:
- Quick Survey - Speedometer Error, Aaron Gilbert, Mon, 5 Mar 2001 15:03:46
- Re: Speedometer Error on my '91 9000 T 5spd, Shahn, Wed, 7 Mar 2001 03:57:11
- Re: Quick Survey - Speedometer Error, shawn feller, Tue, 6 Mar 2001 17:37:08
- My two 9ks also had significant + error, EricG, Tue, 6 Mar 2001 09:26:26
- Yes, too much, Robert Davis, Tue, 6 Mar 2001 08:47:20 <-- Viewing This Message
- Speedometer Error caused by non-turbo tranny, Kurt, Tue, 6 Mar 2001 07:22:21
- Mine's dead on, Quasi, Tue, 6 Mar 2001 00:29:07
- that's exactly what I have, dave n, Mon, 5 Mar 2001 19:02:51
- Re: Quick Survey - Speedometer Error, Craig, Mon, 5 Mar 2001 17:11:05
- Tranmission, Kyle, Mon, 5 Mar 2001 17:07:51
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