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Old 06-15-2010, 04:39 AM   #1
wsc
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Default reversed Suby drive train dilema

Moved on advice

Like the title said i have a small problem, i'm trying to figure out a small dilema, i'm not even sure it can be but if it can i'm hopeing someone here may have the answer.
Problem, am trying to figure out if a reversed suby engine and trans mounted in a VW, ie rear engined, trans in front, will work in a 4WD configuration, the problem i see is the torque split and trying to figure out how to sort it out, vehicle will be used on tarmac if built so it has to steer around cnrs.
any help and advice appreciated
Cheers
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Old 06-15-2010, 09:32 AM   #2
Jaxx
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hmm
all the reversed layout cars that i have seen use a different transmission
so unless you can cut your own gears it will be tough
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Old 06-15-2010, 02:50 PM   #3
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fairly epic project. reversing the rotation of the diffs is not an easy project. There isn't room inside the case to flip the diff around. So you'd have to do some serious machining on the transmission and differential cases to get it all to work.

Also, at least for the divorced diff, possibly for the one in the trans as well, the pinion is not centered. So the gears will not properly mesh when reversed, so you'll have to get some custom gears made.

unless you plan to get the engine to run the other way.....but that's a whole new can of worms.



if you can get over that, the torque split won't be an issue. As long as it's an older EJ transmission (pre-2002, IIRC. the newer ones have a 1.1:1 transfer gearset that theoretically gives them some rear bias), there isn't any bias to one end or the other.
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Old 06-15-2010, 03:23 PM   #4
AKGC8
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Or don't mod anything and set the world speed record for a VW in reverse.
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Old 06-15-2010, 03:45 PM   #5
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www.subarugears.com flipped ring and pinions
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Old 06-15-2010, 04:59 PM   #6
Jaxx
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interesting ...
use the kit above then find a matching diff for the front ..
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Old 06-15-2010, 06:02 PM   #7
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fliping the diff etc isnt a problem as everthing is available and reasonbly priced, my main concern is the torque split, so it dosnt wind up a massive understeering car under power.
cheers
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Old 06-15-2010, 08:50 PM   #8
Jaxx
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if its 50/50 as a front engine ... it should be 50/50 as a rear engine unless you have a dccd
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Old 06-15-2010, 09:57 PM   #9
wsc
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yeh thats right but at 50-50 with applying power out of a cnr it will understeer badly wont it, i was of the opinion you had to have a rear bias under power or am i wrong, this is the bit that worries me
thanks for the input
cheers
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Old 06-15-2010, 11:31 PM   #10
Jaxx
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nope it 50/50 unless it has a dccd
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Old 06-15-2010, 11:38 PM   #11
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Saw one on a buggy at outfront motor sports.
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Old 06-16-2010, 02:09 AM   #12
Numbchux
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Quote:
Originally Posted by wsc View Post
yeh thats right but at 50-50 with applying power out of a cnr it will understeer badly wont it, i was of the opinion you had to have a rear bias under power or am i wrong, this is the bit that worries me
thanks for the input
cheers
it *should* understeer less than a subaru as the torque split is the same but the weight bias is in the rear. the rest is up to your suspension setup.
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