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R32 Gtr Awd Problems

Uncustom

By Uncustom,
in General Maintenance

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Uncustom

Posted
Posted

Hi guys,

I've searched online for quite a while and haven't found any threads that match my problem so far, so here goes.

I have a problem with my AWD in the 32. It seems that the AWD is kicking in when it isn't needed. When I'm just cruising at 70km/h on constant throttle, the torque meter shows a constant 5% and increases with more throttle (never more than 10% though). This causes the car to stutter ever so slightly while cruising. Basically, the car is always in AWD mode.

A bit of background:

This only began straight after I had the front two tyres switched to brand new ones. The tyres are the same size all around. After having this done, I also had the wheels aligned. My suspicion is that it's to do with the alignment. This problem wasn't there before.

Anyone have any ideas?

Cheers in advance.

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https://www.sau.com.au/forums/topic/438047-r32-gtr-awd-problems/
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jiffo Mentor

jiffo

Posted
Posted

Always the same problem with ATTESSA.

Think about it.

You fitted new front tyres, no mention of new rears so I presume the fronts are now bigger in circumference than the rears?

So for any given road speed, the fronts are rotating more slowly than the rears.

Thus the ATTESSA thinks the rears are slipping and applies torque to the front, trying to compensate.

The ATTESSA computer has a small tyre wear allowance but once you exceed that, it's going to start applying front torque which is why, if you must run uneven circumference tyres (front to back) put the new tyres on the back.

Then the fronts will be rotating faster than the rears, moving the wear allowance envelope in the opposite direction.

Always run a tape around your tyres and note each circumference. Fit the largest on the back.

Unfortunately most tyre shops presume GTR's have a 3rd differential, so they don't consider wear when fitting up partial sets of tyres.

jiffo Mentor

jiffo

Posted
Posted

Always the same problem with ATTESSA.

Think about it.

You fitted new front tyres, no mention of new rears so I presume the fronts are now bigger in circumference than the rears?

So for any given road speed, the fronts are rotating more slowly than the rears.

Thus the ATTESSA thinks the rears are slipping and applies torque to the front, trying to compensate.

The ATTESSA computer has a small tyre wear allowance but once you exceed that, it's going to start applying front torque which is why, if you must run uneven circumference tyres (front to back) put the new tyres on the back.

Then the fronts will be rotating faster than the rears, moving the wear allowance envelope in the opposite direction.

Always run a tape around your tyres and note each circumference. Fit the largest on the back.

Unfortunately most tyre shops presume GTR's have a 3rd differential, so they don't consider wear when fitting up partial sets of tyres.

jiffo Mentor

jiffo

Posted
Posted

Always the same problem with ATTESSA.

Think about it.

You fitted new front tyres, no mention of new rears so I presume the fronts are now bigger in circumference than the rears?

So for any given road speed, the fronts are rotating more slowly than the rears.

Thus the ATTESSA thinks the rears are slipping and applies torque to the front, trying to compensate.

The ATTESSA computer has a small tyre wear allowance but once you exceed that, it's going to start applying front torque which is why, if you must run uneven circumference tyres (front to back) put the new tyres on the back.

Then the fronts will be rotating faster than the rears, moving the wear allowance envelope in the opposite direction.

Always run a tape around your tyres and note each circumference. Fit the largest on the back.

Unfortunately most tyre shops presume GTR's have a 3rd differential, so they don't consider wear when fitting up partial sets of tyres.

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