Awhile back i got my car dyno'd and this has been eating away at me ever sense. Normally according to Jestr the evos are 50/50, when they were dynoing my car they had to lock the dyno due to the fact the front wheels were spinning faster then the rear. I am assuming at a rate of Front 60% and rear 40%. Is this normal when the cars are strapped to a dyno? Could the differential have been modified by previous owner?

Any input is apprciated.

 

Make sure it's in Tarmac.

 

Those ACD options don't cause bias power. It shouldn't have any bias... It's still 50/50 whether it's tarmac, gravel, or snow.

 

Hmm, that was always my thought until I watched how it loaded up on the dyno. Changed to Tarmac from Gravel and wheels rotated equally as opposed to the rears being delayed. Maybe it was just that, a delay, and afterwards it was 50/50. My apologies to the OP. Back to his original question...

 

Jestr switched between all options on the dyno and it had no effect. Could a mechanical problem cause this to happen or do you think someone has modified the differential previously?

 

Yup a busted center diff. Your car ever been towed?

 

What type of dyno? I have noticed some of the Dyno Dynamics dont seem to like the ACD, not sure why.

 

If you still have a acd transfercase then there is no mod to change the bias. GSC did have a 60/40 center diff for the pre acd evos. They don't offer that anymore, and from research, the one that Quaiffe offers that was somewhat close to the GSC unit, is not a 60/40. No offerings for ACD equipped evos though.

 

What would be some symptoms of a busted diff? I am not sure what kind of dyno Titan motorsports uses. I would assume the stock transfer case would be in place, any tips on identifying stock from modified?

 

Bringing back from the dead... Any help would be appreciated.

 

as the other guy said, it sounds like a bad center diff.

When mine was broken I spun the front wheels bad when launching. Surprisingly, it wasn't the most obvious thing in the world when it was broke, but maybe because so many other parts of the trans also were breaking the same day...

 

Thanks for the reply, I have no noise or vibration of any sort. Ive been driving with no real drivability issues, ive only launched a few times and it feels like im launching a FWD car so i think you guys have hit the problem on the head.