Thread: 4WD on 2WD Dyno

Originally Posted by Zute

Thats why they left the centre diff' lock in the first D2's. So they could be dynoed on a 2wd dyno.
But yeh, remove front drive shalf. dont just jack up the front wheels. Or we'll be reading about it in the Darwin awards.

No...its not....It'll quite quickly ruin the centre diff

Pull the front propshaft at home, lock the centre diff and head to the Dyno, it will be fine and its the only correct way

Originally Posted by Zute

.... dont just jack up the front wheels. Or we'll be reading about it in the Darwin awards.

Zute thanks for posting but please explain your view (which is pretty pointed re the Darwins suggesting I am a very dead dickhead if I don't disconnect front shaft) as my thread seeks ie "why" (that is mechanical reasons)??

Originally Posted by rovercare

No...its not....It'll quite quickly ruin the centre diff

Pull the front propshaft at home, lock the centre diff and head to the Dyno, it will be fine and its the only correct way

Hi Rovercare....providing front wheels are off the deck (as I state up front to this thread) ...why then will the centre diff be ruined as you say if front shaft is also not removed ????

Originally Posted by cockie55

Hi Rovercare....providing front wheels are off the deck (as I state up front to this thread) ...why then will the centre diff be ruined as you say if front shaft is also not removed ????

That was in reference to the D2 and not having a centre diff lock, if you run without CDL on a 2wd dyno and your front wheels of the ground it won't work very well if you run on a 2wd dyno with front wheels on the ground and front prop in, without CDL you'll ruin your centre diff quick smart

I think it'd be a tad foolish to run with your front wheels happily whizzing around at 100+km/hr as opposed to removing the front shaft....but I am a believer in natural selection

My originating post said...."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 ?????"

Therefore I don't know where doing it with a D2 and or leaving centre diff unlocked came from??? Anyway seems the answer is removing front prop shaft adds nothing mechanicaly and drive line will be sweet.

Thanks all

Originally Posted by Zute

Thats why they left the centre diff' lock in the first D2's. So they could be dynoed on a 2wd dyno.
But yeh, remove front drive shalf. dont just jack up the front wheels. Or we'll be reading about it in the Darwin awards.

Originally Posted by rovercare

No...its not....It'll quite quickly ruin the centre diff

Pull the front propshaft at home, lock the centre diff and head to the Dyno, it will be fine and its the only correct way

Originally Posted by cockie55

My originating post said...."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 ?????"

Therefore I don't know where doing it with a D2 and or leaving centre diff unlocked came from??? Anyway seems the answer is removing front prop shaft adds nothing mechanicaly and drive line will be sweet.

Thanks all

It came from the above post and that post I was referring to, not your original post, to put it in lamens terms, you can lock your centre diff and prop the front wheels, but its 1. lazy and 2. a stupid idea having large amounts of rotating mass hanging of the ground spinning like ****, make sense?

For those in Sydney, Unigroup Engineering has one. Sees all sorts of vehicles. Yavuz is an excellent tuner as well.

Pretty much most performance shops have them as Skylines/Evo's/Subarus NEED them. Any shop that didn't want your work I wouldn't worry about.

What are you having done? Anything performance related I'd rather tune it with full load on the whole system. I know it should be the same but...

I did some ringing around today....seems a whole lot of respected 4X4 shops simply prop front wheels with centre locked and don't remove prop shaft........interestingly when I then said I was concerned about the front drive line having no load they imediatley agreed that dropping the shaft was preferable but that would take more time ...blah ...blah.

While I am only after comparative data on some alternative setups and therefore not that interested in actual outputs on a 2wd being out of wack, I have decided to put up with the extra wait time and $ and do it on a 4wd. All the same I would be interested to hear one day why removing the front shaft and not jacking the wheels is a must do?