speedometre error

Submitted: Sunday, Mar 14, 2004 at 16:22
ThreadID: 11238 Views:1450 Replies:5 FollowUps:5
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How do you correct speedometre error once you've put bigger tyres on?
Is there a simple way?

Dave >
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Reply By: Baz (NSW) - Sunday, Mar 14, 2004 at 18:31

Sunday, Mar 14, 2004 at 18:31
Dave,i have'nt heard of one, the way i know of is to take the vehicle to a place that recalibrates speedo's there is one in Silverwater Rd Silverwater, the Police use it for their vehicle's so they must be good, i'm in NSW i'm sure there must be one in your state if your not in NSW.

Baz.
AnswerID: 50308

Reply By: Member - Peter D M - Sunday, Mar 14, 2004 at 20:35

Sunday, Mar 14, 2004 at 20:35
dave, it depends on the vehicle you have. from experience with rodeos when i put on 265-75 -16 wheels it underreads about 8% by changing the speedo sensor gear from 19 to 18 tooth its whithin .5 km at 100km checking it with gps. maybe you can do something similar a bit hard to give advice not knowing ypur vehicle type.
regards peter
AnswerID: 50322

Reply By: Truckster (Vic) - Sunday, Mar 14, 2004 at 20:57

Sunday, Mar 14, 2004 at 20:57
What sort of car?

GQ patrols, and GUs you walk down to nissan and buy new gears for the speedo, the gearbox end, $15-30 and its correct again.
AnswerID: 50325

Follow Up By: Hilly - Sunday, Mar 14, 2004 at 23:45

Sunday, Mar 14, 2004 at 23:45
Truckster, you legend. I've changed my GU 4.2 from the standard 265/70's to 285/75's. Any idea of the part number I need? Your knowledge of Patrol's never cesaes to amaze me.

Cheers,

Hilly
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FollowupID: 312152

Follow Up By: Member - Captain (WA) - Monday, Mar 15, 2004 at 12:08

Monday, Mar 15, 2004 at 12:08
Hilly, make sure you check what your speedo is now reading. When I changed from the standard 265/70 to 285/75 om my GU, it actually made the speedo correct.

From new it was over 7% out, whereas now with the 285/75's at a true 100 km/hr (as measured by my Garmin V GPS) the speedo indicates 101 km/hr.

Seems like the GU was designed for 285/75's. Or just a case of Nissan dealers getting there services done 7% earlier and you losing out on 7% of your warranty!!!

Cheers

Mark
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FollowupID: 312170

Follow Up By: Hilly - Monday, Mar 15, 2004 at 21:18

Monday, Mar 15, 2004 at 21:18
Mine was the reverse, Captain. Spot on with the 265/70's and now reads about 7 - 8% low. 100 on the speedo, 107 ish on the GPS
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FollowupID: 312245

Follow Up By: Truckster (Vic) - Monday, Mar 15, 2004 at 22:06

Monday, Mar 15, 2004 at 22:06
Hilly, any good Nissan dealer worth spit should be able to help you out.

if not try
http://groups.yahoo.com/group/Patrol4WD/
in the files section, Bazzle has created a few spreadsheets to assist.
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FollowupID: 312249

Follow Up By: Wazza (Vic) - Tuesday, Mar 16, 2004 at 14:24

Tuesday, Mar 16, 2004 at 14:24
Hilly, maybe that is why we got a speeding fine in Perth that time we were following you in the hire car.

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FollowupID: 312333

Reply By: Fishin' Dave - Monday, Mar 15, 2004 at 06:14

Monday, Mar 15, 2004 at 06:14
The 4x4 that the speedo is out on, is a Sierra.
I was hoping you could just change a gear somewhere.

Has anyone done it with a Sierra?

Dave >
AnswerID: 50350

Reply By: phil - Monday, Mar 15, 2004 at 11:11

Monday, Mar 15, 2004 at 11:11
If the tyre size change is enough to cause a problem with the speedo then you probably also need an engineers certificate for the modification to the tyres to stay legal.
AnswerID: 50372

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