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Speedo/odometer/tripmeter error 

 

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 Post subject: Speedo/odometer/tripmeter error
Posted: Mon Jul 17, 2006 9:01 am 
Stock as a Rock
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Ride: Black ED Fairmont 5.0L

Location: Sydney
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Hi All,

I've got a problem with the one I love...

yes. My car.

The speedo is over-reading 10 km/h, while the odometer is also over-reading by 10 km as well.

The average km/h reading by the tripmeter is pure fiction - about half of what it should be.

Any ideas of where the fault could be?

My thoughts turn to the speedo sender unit.

What does everyone think?

Will

 

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Posted: Mon Jul 17, 2006 2:13 pm 
Parts Gopher
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Location: sydney
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mine is the same but 20% overeads
been like that for 4 years
i was going to get a j-car speedo adjuster once i get my new diff fitted
i was also going to get the odo fixed by a gauge shop after that and take off about 20,000k's
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 Post subject: Speedo problem
Posted: Tue Jul 18, 2006 8:49 am 
Stock as a Rock
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Age: 41

Posts: 115

Joined: 6th Jun 2006

Ride: Black ED Fairmont 5.0L

Location: Sydney
NSW, Australia

Hi All,

I was wondering last night if it could be because of my wheels - 17 inches with 235/45's.

A mate of mine said his 20 inch wheels on his EB were causing an overead of 20 km/h.

Any ideas?


Will

 

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Posted: Tue Jul 18, 2006 9:59 am 
Parts Gopher
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Location: sydney
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the 235/45r17 (643.3mm) are pretty much the same dia as 205/65r15s (647.5mm) so shouldn't be to much of a problem
20 i would imagine stuff it up
i blamed it on dodgy digital speedo but my LTD with the same speedo seems to read correct
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 Post subject: Re: Speedo problem
Posted: Tue Jul 18, 2006 10:51 am 
Getting Side Ways
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Ride: PX2 Ranger 4x4 XLT Dual CAB

Location: Carrum Downs
VIC, Australia

Willy wrote:
Hi All,

I was wondering last night if it could be because of my wheels - 17 inches with 235/45's.

A mate of mine said his 20 inch wheels on his EB were causing an overead of 20 km/h.

Any ideas?


Will


A 20k differance would require a huge differance in tyre size

As blueprinted said. 235/45 would give you a speedo error of just 0.6%
If your mates running 20s theen he would need a 275/20 or 235/30 to keep his speedo accurate.

Your problem is likely to be the speedo drive or the speedo drive gear.

 

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Like the sign says, "speed's just a question of money. How fast can you go?"

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Posted: Wed Jul 26, 2006 7:58 pm 
Getting Side Ways
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Location: Gosford
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mine is the same i put a fairmont cluster in to replace a broken xr6 one and now speedo is out, im guessing due to different diff ratio. is there a way to reset it?
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Posted: Thu Jul 27, 2006 3:29 pm 
Getting Side Ways
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Changing the cluster should not make any difference, unless the needle is in the wrong position at zero.

 

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She's meanness put to music and the b**ch is born to run!
Like the sign says, "speed's just a question of money. How fast can you go?"

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Posted: Thu Jul 27, 2006 6:08 pm 
Getting Side Ways
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20's on an EB... s**t hot
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