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post #1 of 7 (permalink) Old 06-25-03, 04:59 AM Thread Starter
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Speedo Accuracy after Diff Change in an EL

I'm going to lower my diff ratio from 3.23 (I think, as there is no tag on the diff) to 3.45.

What do I need to do/buy to ensure the speedo and trip computer remains (resonably) accurate.

Thanks,

Mick

2004 BA XR6 TURBO Phantom, Auto, Premium Brakes & Sound, Leather etc. etc.

APS Stage II = 267rwkw = 12.16@118.5mph on street tyres
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post #2 of 7 (permalink) Old 06-25-03, 05:03 AM
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Re: Speedo Accuracy after Diff Change in an EL

Update to a 23 tooth speedo gear.

Learn from other people's mistakes. You won't live long enough to make them all.

If there's commotion coming from the passenger seat, and nothing but earth going round and round outside the windows,.......then everything is not as it seems!

The only time you have too much fuel, is when you're on fire!
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post #3 of 7 (permalink) Old 06-25-03, 05:26 AM Thread Starter
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Re: Speedo Accuracy after Diff Change in an EL

Quote:
Originally Posted by rossi
Update to a 23 tooth speedo gear.
I assume this means that there are no computer changes/mods required, just the speedo gear?

Mick

2004 BA XR6 TURBO Phantom, Auto, Premium Brakes & Sound, Leather etc. etc.

APS Stage II = 267rwkw = 12.16@118.5mph on street tyres
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post #4 of 7 (permalink) Old 06-25-03, 05:39 AM
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Re: Speedo Accuracy after Diff Change in an EL

Raptor originally pointed this one out.

Have a look at the following site:
http://www.chris-longhurst.com/carbi...yre_bible.html
Half way down, it has a tyre/wheel calculator, so you can see how far out your speedo will be to see if you actually need to make changes.
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post #5 of 7 (permalink) Old 06-25-03, 05:48 AM
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Re: Speedo Accuracy after Diff Change in an EL

Try this one as well:

http://www.bmwcsregistry.org/Technic...ternatives.htm
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post #6 of 7 (permalink) Old 06-25-03, 07:15 AM
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Re: Speedo Accuracy after Diff Change in an EL

Ford sell the gears for under $20, easy to replace.
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post #7 of 7 (permalink) Old 06-25-03, 03:47 PM
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Re: Speedo Accuracy after Diff Change in an EL

Yep! That's what I did to mine. I've got an auto though. Not sure about the manuals. It seems to work. No speeding tickets just yet!

Learn from other people's mistakes. You won't live long enough to make them all.

If there's commotion coming from the passenger seat, and nothing but earth going round and round outside the windows,.......then everything is not as it seems!

The only time you have too much fuel, is when you're on fire!
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