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Speed Sender Gear help 

 

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twase
 Post subject: Speed Sender Gear help
Posted: Thu Apr 07, 2005 4:52 pm 
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My speedo is out by 7%, i.e. it reads 120kph when it really means 111kph
Currently I think I have the Lt green gear as the car is a standard 6cy falcon (non lsd). What color gear do I need to get the reading closer?
Do I need more teeth or less teeth on the Gear?

Cheers
TW.

 

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Dellboy999
Posted: Thu Apr 07, 2005 5:03 pm 
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What gearbox and diff ratio do you have.

 

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twase
Posted: Thu Apr 07, 2005 5:23 pm 
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Dellboy999 wrote:
What gearbox and diff ratio do you have.


3.08 I think, looking at the speedo calc it suggests I have a brown gear.
The ratio I can calculate, its the direction I need to go that I can't get my head around, do I need more teeth or less?
Cheers
TW.

 

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raiki
Posted: Thu Apr 07, 2005 5:36 pm 
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You need the sensor to spin slower so it need more teeth. A 7% change might be a bit hard to get right but you can try it or you can get a digital adjuster and do it that way.

 

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XB Coupe, 351C, twin system, C4 shift kitted auto, 9" LSD, Eccose Blue, very loud !!!!
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twase
Posted: Thu Apr 07, 2005 5:52 pm 
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raiki wrote:
You need the sensor to spin slower so it need more teeth. A 7% change might be a bit hard to get right but you can try it or you can get a digital adjuster and do it that way.

Thanks Raiki, that confirms my thoughs, I have bought a grey one (22 teeth) to replace the brown one (20 teeth) so I should see a 9% reduction in displayed speed I hope. Also a 9% increase in shift points as well, maybe now I can run in economy and not have a slug!

Cheers
TW.

 

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twase
 Post subject: Speed Sender help
Posted: Thu Apr 07, 2005 10:00 pm 
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Next Question, how hard is it to remove and replace the gear on the sender?
Chhers
TW.

 

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twase
Posted: Sat Apr 09, 2005 1:19 pm 
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Thanks all, the light green one(21 teeth) gets me within 2% of an accurate speedo. Auto shift points are now at 5500 rpm for economy and 5800 non-economy which I can live with. Now back to my Leaky diff and the Fairmont front conversion.

Cheers
TW

 

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LSD
Posted: Sun Apr 10, 2005 12:06 am 
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LOL, you should've left it as it was. Having a speedo that reads higher than what the car is actually travelling at can be quite useful ;)

 

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XRFan101
Posted: Sun Apr 10, 2005 1:08 am 
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LSD wrote:
LOL, you should've left it as it was. Having a speedo that reads higher than what the car is actually travelling at can be quite useful ;)


Too true :)

 

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twase
Posted: Sun Apr 10, 2005 8:18 am 
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LSD wrote:
LOL, you should've left it as it was. Having a speedo that reads higher than what the car is actually travelling at can be quite useful ;)

Not when the other half has commentry you every time your speedo shows more that the signs on the side of the road. Plus you get more K's on the car than should be.
Cheers TW.

 

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GQ XR6T ghia patrol.

,======o00o
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_( o ) )_____( o ) )=o=) )__
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