Thread: 4WD on 2WD Dyno

Cockie55, The Hand Book state's that to Dyno a D2 on a 2wd dyno. You must remove the front drive shaft and lock the centre diff.
If you where to jack the front wheels off the ground, and run it on a dyno, with the front wheels spinning. If it should fall off the jack or such, than we would be reading about your sorry tail in the Darwin awards. The premise here is that it would be dangerours. Did NOT call you a Dickhead. Lighten up we are all friends here.

Originally Posted by cockie55

Any mechanical reason why you can't use a 2WD Dyno by locking the centre diff (LT230) and lifting the front wheels off the deck ?????

So for clarification to the original question - there are no mechanical reasons why a 4WD could not be dynoed on a 2wd dyno with the front wheels lifted off the ground and the centre diff lock locked.

Clearly there are some possible safety issues already mentioned in the thread. Wouldn't want to see the results of the front diff housing falling off the axle stands

Would be interesting to know how many workshops that test 4wd's on 2wd dyno's actually do remove the front shaft.

Obviously a 4wd dyno would get better results. But on a 2wd dyno wouldn't having the resistance of the front drive/diffs etc be better than having the front shaft removed and having no resistance at all.

There are a few here that have used a dyno service it seems--
I am happy to wait for a 4wd time slot,,

what can i expect to happen in a normal dyno session?

Originally Posted by Pedro_The_Swift

what can i expect to happen in a normal dyno session?

What is a "normal" dyno session?