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Changing the Speedo Sender unit for a 3:27 Ratio Diff 


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Posted: Wed Oct 01, 2008 10:31 pm 
Getting Side Ways

Posts: 6166

Joined: 8th May 2007

TROYMAN wrote:

this is a tricky one?
today i changed the diff in my ed from 3.08 to 3.27.
i also changed the speedo gear from 20 teeth to 21 teeth.
the speed is correct for the ratio.
and it did not change the shift points at all?? the car was shifting at 4700 full throttle with the 3.08 and with the 3.27 it still shifts at 4700 rpm.

Cant see why it should change any different. Changing diff ratio just means the revs peak out faster, and changing to the correct speedo gear fixes speedo reading.

If you left the old speedo gear with the new ratio, and used a speedo corrector to fix speedo reading instead, only then you would find different rpm's with shift points

s**t, i just confused myself...
Posted: Wed Oct 01, 2008 10:59 pm 
Tyre Shredder
User avatar

Age: 29

Posts: 312

Joined: 4th Oct 2007

Gallery: 8 images

Ride: AU XR8 220 Series 2

Location: Melbourne
VIC, Australia

Ive changed my diff from 3.23 to 3.45 (as some of you know- dont laugh) also the engine EL tickford with matching ECU. In power mines changes at 5200rpm usualy its great no complaints, in economy when you plant in it kicks back 1 or 2 gears n revs to 5000rpm n damn the car moves. I luv it



EB 1 Fairmont - SOLD
AU 2 XR8 220 - Stock - Silhouette, 5spd man.

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