Please Help 32gtr Attesa

[DVS JEZ]

got some new tyres today 255/40/17 on the rear previously had 245/45/17 ont the rear.

front has 235/45/17 which have been on there for a little while,

since new tyres on the rear my front torque gauge is always up except on decel, slightr accel it goes up a bit,

i tried to match the front to rear outside diameter as close as possible, weird thing is that the tyre combo i have now is closer than it was before,

do 32GTR gauges always read on slight accel?

i have tried disconnecting the battery cuase i thought maybe it needed to be reset.

all help appreciated?

cheers

Jez

Edited March 2, 2007 by DVS32R

[ali-turko]

mate your tyre profiles are different fronts 45 and rears 40,

in order for the 4wd system to work properly u must have the same rolling diameter on each wheel

[JonesyGTR]

^^^^what he said

Cheers,

Dan

Edited March 2, 2007 by JonesyGTR

[heller44]

Same rolling diameter, or smallest rolling diameter on the front.

With new tyres, with your sizes, your rears have a slightly smaller rolling diameter.

When I replaced my worn fronts with the same size as the rears, even that was enough of a difference in rotating diameter to upset the 4wd, showed as a pulsing torque.

Attatched tyre calculator for anyone interested..

edit. won't let me add the xls file. sorry.

Edited March 2, 2007 by heller44

[DVS JEZ]

mate your tyre profiles are different fronts 45 and rears 40,

in order for the 4wd system to work properly u must have the same rolling diameter on each wheel

i got tricked by this too.

the 40 and 45 are percentages.

255 rear and 40% of 255 = 102

235 front and 45% of 235 =105.75

245 rear and 45% of 245 =110.25 (old rear tyres, with this it pulsated alot)

its closer than what i had, but i think you guys are right about the fronts need to be smaller.

it doesnt pulsate it is just alot more responsive. it actually feels better out of the corners

THANKS EVERYONE

Edited March 8, 2007 by DVS32R