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        General >> Give/Need advice to/from others >> scorp rear diff
        
(Message started by: goldie on Nov 15^th, 2011, 4:53pm)

Title: scorp rear diff
Post by goldie on Nov 15^th, 2011, 4:53pm

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 ! ;D

Title: Re: scorp rear diff
Post by goldie on Nov 15^th, 2011, 5:42pm

the slipper was a sierra cosworth slipper by the way not a 24v ;D

Title: Re: scorp rear diff
Post by gozz on Nov 15^th, 2011, 8:30pm

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.

Title: Re: scorp rear diff
Post by goldie on Nov 15^th, 2011, 8:36pm

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

Title: Re: scorp rear diff
Post by Stixy on Nov 15^th, 2011, 8:40pm

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 ?

Title: Re: scorp rear diff
Post by goldie on Nov 15^th, 2011, 8:46pm

225/50/16 ;D

Title: Re: scorp rear diff
Post by gozz on Nov 15^th, 2011, 9:02pm

Must be the tyres as well then added to the sender ?
GOZZ.

Title: Re: scorp rear diff
Post by goldie on Nov 15^th, 2011, 9:05pm

what do you mean gozz ?

Title: Re: scorp rear diff
Post by Stixy on Nov 15^th, 2011, 9:11pm

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

Title: Re: scorp rear diff
Post by goldie on Nov 15^th, 2011, 9:15pm

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

Title: Re: scorp rear diff
Post by Stixy on Nov 15^th, 2011, 9:17pm

That sounds about normal to me with the Scorps i have had

Title: Re: scorp rear diff
Post by goldie on Nov 15^th, 2011, 9:21pm

one good thing ive got a proper slipper now so the wet will be fun pmsl !

Title: Re: scorp rear diff
Post by goldie on Nov 15^th, 2011, 9:23pm

thought that tyre size was standard anyway ??

Title: Re: scorp rear diff
Post by gozz on Nov 15^th, 2011, 9:37pm

You could try to get the correct gear wheel for the diesel,I think they clip in don't they ?

Title: Re: scorp rear diff
Post by goldie on Nov 15^th, 2011, 9:43pm

?? gear wheel ??

Title: Re: scorp rear diff
Post by Tekno on Nov 30^th, 2011, 9:53pm

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