I asked this at my local forum www.mkcruise.co.uk someone suggested to try asking at this site.

I need to know whether it's possible to change the torque split from 30/70 to 70/30 (or as close as possible). Is the torque split in the transfer box, or is it something to do with the diffs?

This would be for a project, where the entire engine and transmission system would be rotated 180°, and the differentials would be flipped over so the wheels turn the other way round. This would create a 4wd, rear engined setup.

The problem with this is that the torque split will put most of the power through the front wheels, where there is no weight as the engine is in the rear. If i could swap the torque split around so most of the power goes to the rear wheels, i'll be sorted.

Any help would be greatly appreciated.

 

contact gearboxman bob, he'll tell you everything you need to know.

i can tell you that it's nothing to do with the diffs, but not much more than that. it has something to do with the ratio's in the transfer box i think.

sounds like an interesting project. i would also check with bernie that the diffs will be ok upside down - there may be lubrication issues (like the oil pissing out of the breather hole for a start )

 

I've sent him a PM, thanks very much.

The diffs would be very interesting, not so much the lubrication issue which could be sorted with some slight modification to the diff cases. But i'll have to squeeze the larger diff that takes most of the power under the engine somehow, whilst keeping the centre of gravity lower than a double-decker bus with a group of American tourists on top. I see some serious sump mutilation coming!

 

the torque split is down to the planetary gears inside the transfer box
and it's 1/3rd to the front and 2/3dr's to the rear under all conditions
the viscous coupling is always locked up but because the axles are roating at the same speeds it doesn't do anything
when the rear axle starts to spin faster than the front one the lock sends more of the twist towards the front

you won't be able to unengineer this fact just by turning the box around or doing anything to the internals

 

and while we are on the subject of gearboxes, he's in this months fast ford

10 points to anyone who can spot the error in one of his answers though (but this may be down to someone else writing down the wrong words also)

 

Cheers dojj, to be honest i'm a little relieved, i almost bought a 4x4 engine and transmission very cheap on ebay, but decided to be certain that i could use it first. Now i know i didn't miss out on a great deal.

 

no worries

i thought about this a while ago when me and mob were trying to get our heads around all of it, and it's an engineering nightmare
you have 1 input and 2 outputs
if you wanted to make the split somewhere else you'ver have to change the input into the transfer box from the gearbox, not worth the time and effort (or money)

 

Maybe I will get my Fast ford sometime this week :-D I hope.
sounds like an interesting article. I tried and email that guy a couple times but I never got a response from the company. ohh well, guess I need to call if I really need an answer.

The more my poor Scorp sits I think about turboing the v6 (t2's or t3's) but may need a stronger 4x4 setup. dunno.

 

that's what i was going to do with mine until a change of plan has forced me into putting in the cossie engine. i even bought a couple of tubular steel exhaust fanimolds for it to fabricate up for turbo's. i would've gone for escort or fiesta rs turbo units, as they are plentiful and cheap (due to people upgrading to t3's) and just had a nice low boost setup to up the midrange nicely.

 

what did you plan on using to add extra fuel and timing?
one advantage (the only one) of the 2.8 head design is that there are only two ports, so all I have to do is run two tubes to the turbo and be done with it. LOL. damn this is starting to sound easier than I originally thought.
The scorp will be used as a daily driver (long drives) and towing the sierra to race events. so I just want a lil more kick in the rear (all four) once in awhile, but still maintain gas mileage. turbos can if configured right... improve fuel economy.

 

i would've built a megasquirt ecu