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R32 Grt Chugging In 4Wd Mode After A Certain Speed Is A Achieved

danny14
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danny14 Mentor

danny14

Posted
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hey guys my gtr 32 is chugging when goin about 80 kms it only does it in 4wd mode

is it because car too low ??

what could it be its deff in drive chain not engine weird

please help if ya can

danny14 Mentor

danny14

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diff size tyres from front to back .. but it has always done it a bit and got worse now only in 4wd really annoying

but i had squeak in suspension checked and they said it sitting on bump stops at front

fluids are fine i repalced some copper washes at attessa pump because was leaking .

whats best thing to do ?

Moodles2 Grand Master

Moodles2

Posted
Posted

diff size tyres from front to back .

A problem right there (not *the* problem though I don't think), ATTESSA expects same size tyres all around (best to stick to same brand).. even with the same brand tread difference between front and back can trip ATTESSA up. ATTESSA wasn't meant to be run fulltime, even if it's a tiny bit from the tyre difference the damage to the transfer case (clutch packs in particular) might already be done.

heller44 Mentor

heller44

Posted
Posted

Even when I had 235/45/17's all around, with the new ones on the front and worn ones on the back it was enough of a difference to produce this effect.

What rims and tyres are you running currently?

blind_elk Grand Master

blind_elk

Posted
Posted

diff size tyres from front to back .. but it has always done it a bit and got worse now only in 4wd really annoying

Shouldn't ever do it in 2WD mode. As per the several thousand other threads that discuss this problem, the ATTESSA thinks the rear wheels are slipping, because they are smaller rolling diameter than the fronts, and therefore rotate faster.

I am still at a loss as to how many times we have to tell AWD owners to match the front and rear wheel / tyre sizes.

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