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Topic: scorp rear diff (Read 764 times) |
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goldie
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scorp rear diff
« on: Nov 15th, 2011, 4:53pm » |
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hi guys i recenltly blew my rear diff in my diesel estate auto . the only diff i had spare was a cossy rear slipper so i put this one in now the speedo reads 10 mph higher is there anyway i can cure this 
ta
goldie ! 
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goldie
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Re: scorp rear diff
« Reply #1 on: Nov 15th, 2011, 5:42pm » |
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the slipper was a sierra cosworth slipper by the way not a 24v
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gozz
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Re: scorp rear diff
« Reply #2 on: Nov 15th, 2011, 8:30pm » |
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You need a speed sensor to match the diff ratio,I doubt the Sierra one would be suitable though.The next ratio to yours is a V6 which is 3.64 as against the diesel at 3.36,the Sierra probably had a 4.2 or similar,much lower hence the speedo reading.
GOZZ.
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goldie
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Re: scorp rear diff
« Reply #3 on: Nov 15th, 2011, 8:36pm » |
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would a speed sensor out of a 24v auto box do the job ??
i presume a 24v auto box is different to a diesel autobox ??
goldie
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Stixy
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Re: scorp rear diff
« Reply #4 on: Nov 15th, 2011, 8:40pm » |
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Sierra Auto's have a 3.62 or a 3.38 diffs
but they are for 165/13 or 185 65 14 tyres ( both work out to almost the same size 165 total Diameter is 59.42 cm and the 185 65 14 Total Diameter:59.61 cm )
What size wheel/tyre is your Scorp ?
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goldie
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Re: scorp rear diff
« Reply #5 on: Nov 15th, 2011, 8:46pm » |
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225/50/16
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gozz
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Re: scorp rear diff
« Reply #6 on: Nov 15th, 2011, 9:02pm » |
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Must be the tyres as well then added to the sender ?
GOZZ.
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goldie
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Re: scorp rear diff
« Reply #7 on: Nov 15th, 2011, 9:05pm » |
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what do you mean gozz ?
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Stixy
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Re: scorp rear diff
« Reply #8 on: Nov 15th, 2011, 9:11pm » |
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Acording to this website with that tyre size
http://www.kouki.co.uk/utilities/visual-tyre-size-calculator
if you used a Sierra 3.62 or a Scorpio 3.64 speedo drive your speedo 60mph will be actualy be 62.2 mph
have you checked your speedo against a sat nav or gps speed Scorpio speedo's are generaly an optomistic guess at how fast you are going anyway
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goldie
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Re: scorp rear diff
« Reply #9 on: Nov 15th, 2011, 9:15pm » |
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yeah put me sat nav in and at lower speeds 0- 30 its not to bad but at 50 70 and 100 its 10 mph off
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Stixy
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Re: scorp rear diff
« Reply #10 on: Nov 15th, 2011, 9:17pm » |
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That sounds about normal to me with the Scorps i have had
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goldie
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Re: scorp rear diff
« Reply #11 on: Nov 15th, 2011, 9:21pm » |
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one good thing ive got a proper slipper now so the wet will be fun pmsl !
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goldie
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Re: scorp rear diff
« Reply #12 on: Nov 15th, 2011, 9:23pm » |
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thought that tyre size was standard anyway ??
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gozz
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Re: scorp rear diff
« Reply #13 on: Nov 15th, 2011, 9:37pm » |
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You could try to get the correct gear wheel for the diesel,I think they clip in don't they ?
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goldie
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Re: scorp rear diff
« Reply #14 on: Nov 15th, 2011, 9:43pm » |
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?? gear wheel ??
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Tekno
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Re: scorp rear diff
« Reply #15 on: Nov 30th, 2011, 9:53pm » |
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you can fit ford mustang AOD vss gears to scorpio A4LDe/E Box. they have wide selection of teeth and available in US Ebay and other sites which sell AOD parts
for example, 2.0 16v rear diff + scorpio 2.3 16v A4LD + 205/55R16, this gear makes speedo show only 1% more than real speed, eg VERY accurate: http://cgi.ebay.com/ebaymotors/Fox-Mustang-AOD-23-Tooth-Speedometer-Gear -CLIP-302-351-/180393687081
(I bought and fitted that)
more teeth = speedo shows lower
I've also tried 19,20,21
At my experiences between them difference between 1 teeth is about (if I remember correct) 5%-unit in speedo error
so if your speedo reads for example 110 at 100 (error 10%) or 55 at 50 (error 10%), i'd say you need two more teeth in vss gear. Figure out what percentage you have, and then try to find better vss gear. Changing it is very easy once you get under the car
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1998 Ford Scorpio Ultima Estate 2.3i 16V
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