speedo accurate

Submitted: Sunday, Apr 28, 2002 at 00:00
ThreadID: 1040 Views:1506 Replies:5 FollowUps:1
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how accurate is the speedo on patrol 3ltr turbo dti tyres fitted are bfg at,s 265x70x16 stuart
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Reply By: Ray - Sunday, Apr 28, 2002 at 00:00

Sunday, Apr 28, 2002 at 00:00
Had these tyres fitted to my patrol The speedo according to the GPS read 100KPH when the actual speed was 98KPH
Ray
AnswerID: 3182

Reply By: Graham - Monday, Apr 29, 2002 at 00:00

Monday, Apr 29, 2002 at 00:00
I've checked my 3.0 GU against a GPS unit and it showed only 92kmh against the speedo's 100kmh - same tyres with 5000km on them.
AnswerID: 3205

Follow Up By: Steve - Tuesday, May 28, 2002 at 00:00

Tuesday, May 28, 2002 at 00:00
Graham,

I too have a 3.0 GU, 1000 kms new, and the speedo shows 92kmh while the GPS shows 100kmh. The vehicle is fitted with Nissan Ti alloys, and the factory rubber. Does anyone have any feedback as to Nissan's position here? Is there a fix?
0
FollowupID: 1648

Reply By: Ron- Monday, Apr 29, 2002 at 00:00

Monday, Apr 29, 2002 at 00:00
I would not rely on the GPS as I have just recieved a speeding ticket. GPS reading 102kph.Speed camera 111kph,so I will using the speedometer in future.
AnswerID: 3214

Reply By: Fraser Coast Adventures - Saturday, May 04, 2002 at 00:00

Saturday, May 04, 2002 at 00:00
I may be wrong but my experience would suggest that a GPS will only give you an accurate speed reading if it is giving you an accurate altitude reading. In order for it to do this it must be able to see some satelites very near the horizon, driving in you vehicle along most roads (other than deserts or beaches) does not provide this view of the horizon. DAve
AnswerID: 3325

Reply By: Richard - Wednesday, May 29, 2002 at 00:00

Wednesday, May 29, 2002 at 00:00
Presuming you allow for some wear of the tread. BFG's are a fairly deep tread and blocks and will almost certainly make your wheel taller when new. I changed up to BFG Mud terrain 285/75 16 and then had the speedo re-calibrated. This proved relatively easy and inexpensive because being electronic in the GU and not mechanical they didnt need to use a ratio box. I also got certification. The bonus in running taller tyres for the 3ltr is the revs are 2000 at 100 k/hr and better clearance.
AnswerID: 3901

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