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Andrew Brown
TryHard
NSW
Soarer V8

Posts: 376
Reg: 10-2012

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 Friday, June 02, 2017 - 11:14 am, by:  Andrew Brown (Crazyassdrummerboy) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Hoping someone can help me with the maths. I have changed gearbox, diff, and wheels so this is a bit complicated.

Currently I am running 225/35R20 wheels with standard 3.9 diff and manual swap so is reading 10% over actual speed. So 100kph reads as 110 on the cluster

When I install my 4.1 diff and change to 235/40R18 wheels what will my cluster read at 100kph?

please help haha!
Blake Gloyn
Goo Roo
manawatu
soarer JZZ30 TT

Posts: 1347
Reg: 02-2006

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 Friday, June 02, 2017 - 07:43 pm, by:  Blake Gloyn (Blakenz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
your diff change will bring the speedo down(actual 100km/h) to 105km/h displayed. The wheel change will bring it down further to 102km/h.
Andrew Brown
TryHard
NSW
Soarer V8

Posts: 377
Reg: 10-2012

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 Friday, June 02, 2017 - 11:13 pm, by:  Andrew Brown (Crazyassdrummerboy) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
I have no idea how you worked out, but thank you so much for doing it mate!
Mike Beck
Goo Roo
New Zealand
3UZ-FE V8 4.3 UZZ32

Posts: 6109
Reg: 11-2005

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 Tuesday, June 06, 2017 - 10:20 pm, by:  Mike Beck (Gold_40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
On a side note, you should probably run 245/40R18 rather than 235/40R18 as this gives the correct tyre diameter. 1.2% error otherwise.

That said, depends how low you have the car if rubbing is an issue, 235 will give you a bit more guard room.
Mark Donovan
Goo Roo
Auckland
V8 Limited, LS400

Posts: 1031
Reg: 07-2005

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 Thursday, June 08, 2017 - 06:54 am, by:  Mark Donovan (Mark_donovan) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Run a navigation app like Waze, or Apple Maps, when driving on the highway. It will display your speed as calculated via GPS.

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