|
Xoutpost server transfer and maintenance is occurring.... |
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
MPH. help
when i got my x5 last year,it came with p225-65-r17 tires tag on door calls for 235-65-r17 according to sites at 60mph it should be 61 no big deal my issue is no matter what gps i use in this vehicle it reads that i'm 10.mph off.so 60 it's really 50 but when i use the same gps on my other vehicle they are on point. what other test can i do or my speedo really off.??? thanks
__________________
4/02 x5 3.0i AUTO BLACK KISSIMMEE FL |
Sponsored Links | |
|
#2
|
||||
|
||||
The sidewall of a 225-65 is smaller then a 235-65.
Smaller tires will need to rotate more per mile when new, even more when worn.
__________________
'03 X5 4.4 Sport, last of the M62s (8-03 build date) I believe in deadication to craftmanship in a world of mediocrity! |
#3
|
||||
|
||||
Oh, I misread the post.
Yeah, time for a speedo recalibration.
__________________
'03 X5 4.4 Sport, last of the M62s (8-03 build date) I believe in deadication to craftmanship in a world of mediocrity! |
#4
|
||||
|
||||
^ What trader4 wrote...
the diff on 225 vs 235 in OP's size is nominal. And, Ibid on the interstate mile marker with stopwatch test. Do it a few times, steady on the speed. Not sure I agree that most GPS units are spot on, in terms of speed. GL, mD
__________________
Ol'UncleMotor From the Home Base of Pro Bono Punditry and 50 Cent Opins... Our Mtn Scenes, Car Pics, and Road Trip Pics on Flickr: http://www.flickr.com/photos/4527537...7627297418250/ http://www.flickr.com/photos/4527537...7627332480833/ http://www.flickr.com/photos/45275375@N00/ My X Page |
#5
|
||||
|
||||
Will you be using the OBC's built in STOPWATCH? Ifyes, Iwonder if they work in cohoots with one another....BMW's built-in way to protectyou from getting speeding tickets. (I kid)
Just in case someone didn't know...the high cluster/high MID (and Nav screen) has a STOPWATCH feature...and you can see the symbol (far right on MID display in pic below) when it is initiated:
__________________
Become a BMW CCA member! Click HERE to join and feel free to use my BMW CCA member #191509 as a referral.
|
#6
|
||||
|
||||
my instrument cluster also has a digital readout of your speed, you just got to unlock it by adding the last 4 of you vin and putting that number into the unlock test
__________________
04 black on sapphire 4.8is personally put 90,000kms fully loaded minus the fold out trunk floor -20' DUB X10 3 piece rims staggered setup -LED angel eyes + interior lights + e70 style shifter -AFE stage 2 intake system -x-pipe/resonator delete -UV coat windshield -rebuilt Pano roof -dynavin N6 -all front and rear end suspension parts and both front cv shafts replaced -OEM hitch And 2007 GSXR750 |
#7
|
||||
|
||||
Unlocking cluster requires the sum of the last 5 digits of your VIN. Then go to OBC TEST #8 to see momentary road speed (in kilometers).
__________________
Become a BMW CCA member! Click HERE to join and feel free to use my BMW CCA member #191509 as a referral.
|
#8
|
|||
|
|||
Your GPS is telling you that the tires are too small. Way too small.
You can (I do) run a 245/65x17, and the speedo will be much tighter on reality. Your GPS is right to within a few feet on location, and it's only wrong because the original military applications that went to civilian use were required to have an error in both time and space. If you get bigger tires, 245/65x17, then the tires turn slower for the same speed, or more speed comes from the same speedo reading. Bottom line, the 225s are too small. Do not buy them again. |
#9
|
|||
|
|||
225/65x17 = 28.515 diameter, or 89.582 circumference.
245/65x17 = 29.539 diameter, or 92.800 circumference. Divide a mile, by the circumference to find the number of revolutions per mile. The 225 goes around 707.28 times,the 245 goes around 682.75 times. The difference here is easily why you get a speedo reading of 60 when you are really going 50. |
#10
|
|||
|
|||
thanks but remember i bough the vehicle with those tires already on and the factory sticker on driver door calls for 235 not 245 my laptop with wxp that had inpa on die on me other wise i could off check it that way by reading the actual abs sensor rreadings
__________________
4/02 x5 3.0i AUTO BLACK KISSIMMEE FL |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|
|