MT75

engmpoll · Post by **engmpoll** » Wed Oct 03, 2007 9:11 pm

Mike,

You'll have to tell me what car your running, I know i've seen it before in the forums but can't remember right now. How do you have your setup orientated, engine behind the seats and box towards the rear or engine in the back with box pointing to the front??

stevieturbo · Post by **stevieturbo** » Wed Oct 03, 2007 9:29 pm

Both Ford an Nissan chose to mount their front diff to the sump.

But again, this all depends on what you are building, and if this is feasable.

Id say it would be a normal approach for a front engined awd vehicle though that uses a rwd style layout.

engmpoll · Post by **engmpoll** » Wed Oct 03, 2007 9:46 pm

I must admit, I was leaning towards front engined having seen the 4x4 V6 Mini on the internet, google search brings it up. Plus the gearchange would be correctly laid out and it seems to be the way to do things with all the manufacturers, grp B rally cars excluded.

engmpoll · Post by **engmpoll** » Thu Oct 04, 2007 3:32 pm

[quote="kiwicar"]

One solution might be a box/transaxel like the audi quatero one off an 4.2 V8, it also comes with a v8 engine attached, stick it in the middle, drive the rear wheels off the diff on the front of the box and take the drive that would normally drive the rear wheels forward and to the side of the engine, you would then have enough propshaft length to get the drive to a diff at the center of the car at the front (and be able to sit in it), you could use the box that transfers the drive forward to sort out the correct direction of rotation and use the rear audi diff at the front, the ratio wiould atleast be right.

I'm understanding what your getting at here, 4.2 behind the front seats, gearbox towards the rear, rear wheels driven off the front diff, and then the drive whiich normally does the rear diff send to the front somehow?? Am I right on that Mike, problem lies with getting the rear drive to the side and around the the engine??

kiwicar · Post by **kiwicar** » Thu Oct 04, 2007 4:13 pm

Yup that was the idea but I am not sure if you can get the torque split to work correctly.
I am building a Mclaren M1 c replica, it all fits in (though I could do with another half inch for the gearbox) but I recon I can hide it with the number plate.
Mike

engmpoll · Post by **engmpoll** » Thu Oct 04, 2007 4:38 pm

Is the torque split an electronically controlled piece of kit on the audi system? or pressure based like on the skyline box? Any thoughts on how you would get the drive for the front diff out to the side of the engine?

kiwicar · Post by **kiwicar** » Fri Oct 05, 2007 7:10 pm

I don't know how the audi controles the torque split outside the box, but knowing audi it involves several micro controlers. Inside it will be hydraulic pumps and valves, could all be pnumatically linked to the electronics, would be worth sticking an enquiry on one of the audi sites.
Getting the drive to the side is a case of having a gearbox, chain drive or toothed belt set up made up or adapted from somthing like a power take off box what you use would be dictated by which way the drive shaft has to turn by it gets to the front and how close to the sump/bellhousing you can run it.
Mike

kiwicar · Post by **kiwicar** » Fri Oct 05, 2007 7:17 pm

have you had a nose around the quaife website, http://www.quaife.co.uk/ you may get some ideas there.
Mike

engmpoll · Post by **engmpoll** » Sat Oct 06, 2007 9:47 pm

Just had a look around the quaife website, some very nice pieces of kit on there, technical porn if you will!!

stevieturbo · Post by **stevieturbo** » Sat Oct 06, 2007 9:55 pm

Quaife defo make nice diffs.....

Havent heard so many good reports about their gearsets or boxes though.

Over on PF, the Ford guys seem to say their MT75 gearsets are crap.

Mark · Post by **Mark** » Sat Oct 06, 2007 10:38 pm

engmpoll wrote:Hi Guys,

Anyone any experience of the MT75 4x4 gearbox? Anyone know what kind of abuse power wise one of these can take and if they can be uprated to take more??

Thanks in Advance

What are you bolting to it ?

I'm risking a Ford 302 V8 to a 2.9 V6 XR4x4 MT 75 box

Much over 350 LBSFT seems to kill them but they are cheap

Mark

engmpoll · Post by **engmpoll** » Mon Oct 08, 2007 5:54 pm

I'm not fully decided yet on the engine to use, plus the MT75 is off the list due to its poor performance, I know there cheap but don't fancy being on my back every weekend putting a new box in!!

stevieturbo · Post by **stevieturbo** » Mon Oct 08, 2007 5:58 pm

Search the old forum for user name "Autronic" if you can.....

He was bolting a 4.0 Lexus V8 into a 4x4 Sierra, using the MT75 etc....

Lots of superb fab work going on there.

engmpoll · Post by **engmpoll** » Mon Oct 08, 2007 9:09 pm

The old forum?? is the address the same?? Forgive the ignorance!!

stevieturbo · Post by **stevieturbo** » Mon Oct 08, 2007 9:37 pm

There is a link somewhere on the front page...

The V8 Owners Forum -

MT75

Re: MT75