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Tocchi
Cruise Moderator
Age:21
Posts: 809
Joined: 22 Aug 2006
Location: Perth WA, Australia
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 Posted: Thu May 15, 2008 5:59 pm Post subject: diff ratios + cogs |
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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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FordFairmont
Fordmods - Getting Side Ways
Posts: 3003
Joined: 08 May 2007
Location: Sunny QLD, Australia
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| Posted: Thu May 15, 2008 6:05 pm Post subject: |
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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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Tocchi
Cruise Moderator
Age:21
Posts: 809
Joined: 22 Aug 2006
Location: Perth WA, Australia
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| Posted: Thu May 15, 2008 6:14 pm Post subject: |
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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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gogetta
Fordmods - Getting Side Ways
Posts: 2121
Joined: 27 Dec 2004
Location: melbourne, sunshine VIC, Australia
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| Posted: Thu May 15, 2008 6:53 pm Post subject: |
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| are u running auto or manual trans? |
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Tocchi
Cruise Moderator
Age:21
Posts: 809
Joined: 22 Aug 2006
Location: Perth WA, Australia
View User Gallery (18)
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| Posted: Thu May 15, 2008 11:53 pm Post subject: |
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auto. but the torque converter fried on the dyno today
so its gonna be manual soon |
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Tocchi
Cruise Moderator
Age:21
Posts: 809
Joined: 22 Aug 2006
Location: Perth WA, Australia
View User Gallery (18)
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| Posted: Mon May 19, 2008 2:13 am Post subject: Re: diff ratios + cogs |
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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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FordFairmont
Fordmods - Getting Side Ways
Posts: 3003
Joined: 08 May 2007
Location: Sunny QLD, Australia
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| Posted: Mon May 19, 2008 7:08 am Post subject: |
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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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