tires
Submitted: Wednesday, Jul 27, 2005 at 16:58
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ndamico
G'Day,
I have a prado 120 V6 5speed Manual. Along with other mods allready undertaken, it has now come time to swap the oem 265/65R17 (776mm diameter) Grantrecks to something more robust. I would like to upgrade in size a little aswell, 275/70R17 (818mm diamter) to be exact.
I have spoken to several owners who have upgrades in sizes from 265/70R17s to 285/70R17 (fitted to oem rim and two inch
suspension lift only) and all seem very happy with their choices.
My question is would a modest upgrade in size from 776mm diamter to 818mm diamter (as mentioned above) justify modifications to diff ratios to suit this tire or should be ok?.. not sure if I should to be on the safe side.
thanx
Nick
Reply By: prado_95 - Saturday, Aug 06, 2005 at 19:13
Saturday, Aug 06, 2005 at 19:13
The ECU uses the speedo input for some calcs, but this should not be an issue on a manual gearbox.
The biggest issue will be remembering that the speed is now reading slow (ie you are going faster than the speedo says), which may lead to getting done for excess speed by up to about 7%.
Of course anybody else who drives the car needs to know this too (specially the missus!).
Fitting some thing like Speedo-matic might help save some licence points and penalty $$.
AnswerID:
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