Smoke coming from gearbox when on Dyno

[BNR32]

Was on a dyno the other day and the wierdest thing happened.

I dont usually dyno the car in rear drive as its usually always tuned on SAS four wheel drive dyno. This time was an exception.

The car has previously made 440HP at all four wheels, so i would have expected over 500 RWHP. The car ramped up to 1.3 bar and at about 6000 rpm smoke started floating from the gear shif boot. I thought this was strange so cancelled the run at 455 rwhp. Went again for the second time and the power went up to 471 and then dropped off with more slight smoke again.

The smoke smelt like gearbox oil, but there was absolutely no gearbox oil to be seen on the ground or anywhere. Checked all fluids and everything rosy. Only just recently i thought that it might have been something to do with the wet clutch pakcs in the tranfer case, any thoughts?

Has anyone had similar problems running BNR32 gtr in rear wheel drive on a dyno?

By the way, i wont be putting the car on another rear drive dyno, its not worth the headache or the stench of burning oil!

TG

[Jay95R33]

Sounds like clutch slip to me

What sort of clutch do you have, and how old is it ?

J

[BNR32]

nismo gmax2 twinny.... new plates and machining about 15,000 kms ago, probably needs rebuild soonish.

I know what a burning clutch smells like, i dont reckon it was that....

[DoughBoy]

How did you revert to 2WD mode? Disconnected fuse? Pulled the front tailshaft? Split controller?

[BNR32]

fuse

[Ustasa]

Transfer case is leaking

[BNR32]

i thought it could be a blocked breather... Does the transfer case have a breather? Where would the transfer case be leaking?