drive ratio
- Thread starter kaotik
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JAP63
E III Recaro Pilot
tharaka said:
Different size gearing?
WRCVR4
Well-Known Member
JAP63 said:
Its not a different Ratio, but a different torque split, i know the rally guys use all sorts for different events/surfaces, probably the same as the late model EVO has the different center diff settings :roll:
Entaran
Well-Known Member
kaotik said:anyone know what sort of ratios there are in a VR4 J-spec?
in terms of front to rear wheel power transfer.
ive been told WRX's are 50:50, just wondering about the vr4
cheers
The correct answer to this question is:
Variable.
Unlike subaru's all vr4's run centre differentials which can spin from 99/1 to 1/99 in either direction depending on load/traction/etc. The centre diff is limited slip which means it can never go 100/0 in either direction and the likely minimum you'll ever see is 10/90 on a HARD launch (90% rear if you have rear lsd fitted) or usually around 60/40 biased to the front.
The ratios themselves are final drive 3.545 (top speed 256kmh or so) or 3.909 (top speed 214kmh or so) depending on diffs installed (4bolt or 3bolt rear end and crown/pinion). 3.909 are usually 23 spline boxes with transfers to match, 3.545 22.
Mr Gears
Member
If traction, load and balance is equal...power and torque will be equal at each wheel. Take a wheel off the ground and all power will try to escape through that wheel (limited by the VCU, and other LSD's if fitted).
So it is variable, starting from equal power at each wheel to all power at one wheel depending on the variables.
So it is variable, starting from equal power at each wheel to all power at one wheel depending on the variables.
ahahahaJayRome said:off topic: and thus why EVO's are better then WRX's
yeah
thats right
because the extra pumps and what not for the ayc and acd arent going to need servicing and break more often
JayRome
Blurring the line between 1st to 3rd Gen engines..
off topic: Subarpoo's have stolen VW beatle engines...... WTF cant make there own design?......... many years of "evolution" (no pun intended) has gone into re designing the 4wd Mits Drive line and world known 4G63 series engine!!!
BobWrinkle
Member
- Joined
- Dec 19, 2005
- Messages
- 1,201
JayRome said:
WTF are you on about...
Using that logic...Fuck Evos are shit why don't they create their own engine. They are using Model t designed engines (straight 4s).
You can't knock WRXs for using a technically better engine design (boxer), that's just stupid.
The WRX drivetrain is piss poor though...
BobWrinkle
Member
- Joined
- Dec 19, 2005
- Messages
- 1,201
Straight = Tonnes of vibration
V = less due to some canceling out
boxer = minimal due to maximum cancelation.
At least that was the impression i got.
Less vibration means less wasted energy...no?
V = less due to some canceling out
boxer = minimal due to maximum cancelation.
At least that was the impression i got.
Less vibration means less wasted energy...no?
AUSVR4
Well-Known Member
Subaru's 2.5L boxer is the 2006 engine of the year. Like it or hate it, that's that
JonnyRochester
Member
The VR4 does not have a super smart design like some people would surgest. It is all mechanical, nothing to intelligently control torque split. Basically there are 3 diffs, centre, front and rear. Same as all full time 4WD's. But there is a viscous coupling on the centre diff.
Thinking about it myself, I can't see how it would have any other ratio other than 50:50 if all the wheels are on the ground. Maybe if there is more driveline friction in the front or back, that would create a natrual bias. Or maybe there is a different front diff ratio than the back (unlikely)? You could change this yourself to set the bias, but it means your viscous coupling would be working hard the whole time.
With open front and rear diffs as normal, if 1 back wheel and 1 front wheel is off the ground, you are going to just spin, zero torque, going nowhere.
If both front wheels are off the ground, you still get some drive to the back. But you won't get 100% power, as the viscous will always slip and never lock up. (Maybe only 10% power, not sure).
On launching the car, I expect the fronts may spin only because the car is lifted up at the front and putting less weight on the front tyres.
Short of using electrically controled active centre diff, how can a car have a torque spit other than 50:50? It's a serious question, I need to read up on this.
Thinking about it myself, I can't see how it would have any other ratio other than 50:50 if all the wheels are on the ground. Maybe if there is more driveline friction in the front or back, that would create a natrual bias. Or maybe there is a different front diff ratio than the back (unlikely)? You could change this yourself to set the bias, but it means your viscous coupling would be working hard the whole time.
With open front and rear diffs as normal, if 1 back wheel and 1 front wheel is off the ground, you are going to just spin, zero torque, going nowhere.
If both front wheels are off the ground, you still get some drive to the back. But you won't get 100% power, as the viscous will always slip and never lock up. (Maybe only 10% power, not sure).
On launching the car, I expect the fronts may spin only because the car is lifted up at the front and putting less weight on the front tyres.
Short of using electrically controled active centre diff, how can a car have a torque spit other than 50:50? It's a serious question, I need to read up on this.
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