Speedometer accuracy
#16
12-16-2006, 11:44 AM
Registered User
Join Date: Jan 2006
Location: Rochester, MN
Age: 69
Posts: 140
Rep Power: 24 
Just thought In would add that mine is 3mph off as well. And I am running 315's on the back. If tires were stock it would probably be a little more? I guess I would need to check the circumference with stock tires to know for sure.
It would be interesting to know if this would make our odometer read more than actual?
Roger
It would be interesting to know if this would make our odometer read more than actual?
Roger
#18
12-17-2006, 12:02 AM
Registered User
Join Date: May 2005
Location: Colorado
Age: 39
Posts: 1,468
Rep Power: 122 
I can't speak much for 993 and older models, but I drive 986/996/997/Cayennes by a "Your speed is" sign nearly daily, and 986/996 seem to be about 3 high, 997's about 2, and Cayenne's are nearly spot on. As previuosly stated, thats just how it goes.
#19
02-10-2007, 03:07 PM
Originally Posted by rennelist.com
The speedometer is reported to be off (high) by around 10% in some cars. This affects not only speed reported but mileage, which can be significant over the length of a lease. The good news is that there is a software fix for this which should be available at all dealerships. Or do what I did - get a buddy or partner to drive their car at a set speed and tag along behind. I notice that when cruising on the freeway, I'm travelling at the same speed as other cars/drivers, who have presumably set their speed at a nice round number with cruise control..
If the above statement is true, is anyone filing a lawsuit against Porsche? This is wrong
.
#20
02-10-2007, 03:07 PM
Basic Sponsor
mine is off by 4 mph
__________________
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
#22
02-10-2007, 03:55 PM
Registered User
Join Date: Jan 2006
Location: Silver Creek Valley, CA
Posts: 1,034
Rep Power: 61
Originally Posted by gtr
I dont' know why but my 02 996T speedo is 3mph off. Do all of them read higher at highway speeds? FYI i'm using my GPS to compare the speeds.
#24
02-12-2007, 07:54 AM
Mine reads 4 mph high as indicated by both GPS and those roadside speed monitors.
On the other hand, my S4 is dead nuts accurate.
On the other hand, my S4 is dead nuts accurate.
#26
02-12-2007, 10:24 AM
Mine was 1 MPH fast at 60 MPH on stock (new) P-0's according to my Performance box. My new tires are a bit taller and now at an indicated 60 on the speedometer, I am showing 57.
Thread
Thread Starter
Forum
Replies
Last Post
b-man
996
2
06-01-2006 11:53 AM
2006, 2010, 2014, 911, 996, 996tt, accuracy, boxster, camaro, inaccuracies, inaccurate, porsche, speedometer, speeedometer, ttrs
