Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

diff ratio change. speedo correct! yer i know pls read

Cuzzy69

Member
Joined
Aug 6, 2017
Messages
48
Reaction score
5
Points
8
Age
45
Location
Vic
Members Ride
Vs wagon exe v6 l67 vx
spoke to marks 4wd adapters in vic. this model im told will work on 4 speed auto. Part Number: MFKSGI-5E
https://www.marks4wd.com/mfksgi-5e.html

About $250 bucks. will try soon. as for now moving the needle downwards.. eg pull of needle and preposition it at below zero by about 2cm it reads 65 at 60.. 80 at 80 87 at 90 etc.. bit of a guessing game below 60 but should help a few out. so basically it under reads below 70 and over reads above but very close.. i have the 3.89 diff and 255/40/17 rims at back. very close to stock diameter. the needle was about 2cm lower than standard on the s3 dash and a small self tapping screw used to stop the needle from falling into the plastic shroud below it. you will need to pull out the dash insert and split it open to do this.. very easy. at least now at most legal speeds i got a fair ideal of speed as before it read so high it was to hard to guess. all the best guys hope it helps a bit.
 

delcowizzid

on holiday
Joined
Jul 8, 2008
Messages
6,992
Reaction score
433
Points
83
Location
NZ
Members Ride
в∞ѕтεכ √&
The Dakota digital Speedo corrector is only about 85-100 bucks
 

gtrboyy

Well-Known Member
Joined
Jan 25, 2006
Messages
2,396
Reaction score
934
Points
113
Members Ride
vt ss & lc gtr
vdo speedo corrector still available?

That is what we used to use when jaycar item tanked
 

07GTS

Well-Known Member
Joined
Sep 8, 2013
Messages
2,375
Reaction score
805
Points
113
Location
Australia
Members Ride
VEGTS BLOWN E85
vdo speedo corrector still available?

That is what we used to use when jaycar item tanked
yep still have them but prices have gone up, vdo just use Bolec elec ratio box
 

Stock AFM SS Wagon

New Member
Joined
May 11, 2019
Messages
13
Reaction score
0
Points
1
Age
45
Location
Gladstone QLD
Members Ride
2011 VE SS Wagon AFM
Need to change the PPM (pulses per minute) in the gearbox via Tech2. Find the standard PPM and divide it by the standard diff ratio, then multiply that number by the new diff ratio and that will give you your new PPM to enter, then all is done.
IE- 2000 PPM ÷ 3.08 = 649.
649 × 3.89 =2524PPM
 

immortality

Can't live without smoky bacon!
Staff member
Joined
Apr 15, 2006
Messages
15,939
Reaction score
4,240
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX s2 Calais S/C
Need to change the PPM (pulses per minute) in the gearbox via Tech2. Find the standard PPM and divide it by the standard diff ratio, then multiply that number by the new diff ratio and that will give you your new PPM to enter, then all is done.
IE- 2000 PPM ÷ 3.08 = 649.
649 × 3.89 =2524PPM
If only it was that simple....
 
Top