speedometer error adjustment ????
08-04-2001, 03:39 PM
#1
Advanced
Thread Starter
Join Date: Jul 2001
Location: British Columbia
Posts: 55
Likes: 0
Received 0 Likes
on
0 Posts
speedometer error adjustment ????
I have a 88 944S with stock 15" wheel and tire size. I have checked the speedometer with a radar unit and it reads about 12 kp/h fast through the entire range. Does anyone know if there is any way to adjust this?
08-04-2001, 03:50 PM
#2
Instructor
Join Date: Aug 2001
Location: Louisiana
Posts: 132
Likes: 0
Received 0 Likes
on
0 Posts
As a suggestion, be sure the radar unit is calibrated properly with the correct tuning forks. If not, it is very easy to get incorrect readings. Try it against two or three newer cars and see if their speedos are accurate just to be sure it is not the radar.
08-04-2001, 04:12 PM
#3
Race Car
I thought it was just me, mine reads about 10-15% high. I've checked it around town (25-40 mph) and on highways (55+ mph). Also The odometer reads high, on a trip on the Garden State Parkway I passed 39 mile markers, while the odometer went 44 miles. It makes me wonder how long it's been doing this, and how many miles are really on the car (shows 95.3k).
08-04-2001, 05:18 PM
#4
Advanced
Thread Starter
Join Date: Jul 2001
Location: British Columbia
Posts: 55
Likes: 0
Received 0 Likes
on
0 Posts
The speedometer is out, not the radar. The radar was checked with forks before use and the forks were recently certified as well. So the question still stands, it there anyway to adjust the speedometer ?
08-04-2001, 05:23 PM
#5
Racer
Join Date: Jun 2001
Location: la habra, calif
Posts: 343
Likes: 0
Received 0 Likes
on
0 Posts
the auto club does FREE speedometer checks and travels around to different offices to do this, i had mine check before installing the turbo trans in my na and it was right on, it feels completely different now with different gear ratio. i will get a recheck in a couple months, when by project is done. the turbo has a 180 speedo and the na has a 160 speedo but both take the same sensor part number in the book.
08-04-2001, 05:34 PM
#7
Nordschleife Master
I heard that the instrument repair places can do it but they need the unit. I suppose they have to change some circuitry in the head.
It can't read off by 12 kph over the whole range can it? That would cerainly be a different type of error than one normally encounters, i.e., with different rolling radius tires. I suppose the problem could be in the sending unit.
It can't read off by 12 kph over the whole range can it? That would cerainly be a different type of error than one normally encounters, i.e., with different rolling radius tires. I suppose the problem could be in the sending unit.
Trending Topics
08-04-2001, 09:43 PM
#8
Advanced
Thread Starter
Join Date: Jul 2001
Location: British Columbia
Posts: 55
Likes: 0
Received 0 Likes
on
0 Posts
Ok, so its not exactly 12 km/h throught the entire range. At 50 km/h it is 10 over and at 140km/h it is 12 over. I didn't check it under 50km/h. I guess I will have to take it to the Porsche dealer to look at, OUCH!!