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diff ratios + cogs 

 

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 Post subject: diff ratios + cogs
Posted: Thu May 15, 2008 6:59 pm 
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are there any speedo cogs for a 3.45 to 3.73 change?

otherwise ill install the speedo corrector jaycar unit


also, ive used that speedo calculator (in tech docos), but it says :
-X% results in higher speedo value when car is going 100kmh
-X% results in lower speedo value when car is going 100kmh

so its contradicting itself.
so which one is it?
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Posted: Thu May 15, 2008 7:05 pm 
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i doubt theres any cogs for over 3.45

Jaycar unit is pretty straight forward and has been working well in my car for awhile now
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Posted: Thu May 15, 2008 7:14 pm 
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yeh ive made one :) its been sitting on my back seat for a good month, just a tad slack.

plus the 295s made the % almost zero, so i never bothered lol
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Posted: Thu May 15, 2008 7:53 pm 
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are u running auto or manual trans?

 

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Posted: Fri May 16, 2008 12:53 am 
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auto. but the torque converter fried on the dyno today

so its gonna be manual soon
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 Post subject: Re: diff ratios + cogs
Posted: Mon May 19, 2008 3:13 am 
Getting Side Ways
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sorry to bump this, but can anybody any answer this for me

Tocchi wrote:
also, ive used that speedo calculator (in tech docos), but it says :
-X% results in higher speedo value when car is going 100kmh
-X% results in lower speedo value when car is going 100kmh

so its contradicting itself.
so which one is it?
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Posted: Mon May 19, 2008 8:08 am 
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When you go from 3.45 to 3.73 your speedo will be reading 8.12% higher.

This means after youve fitted the 3.73 diff, when the speedo shows 100kph, you are really doing 91kph.

When your speedo shows 109kph, you are really doing 100kph

So you must use a speedo corrector to reduce the speedo figure by 8 percent to read correctly
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