Honda Tech Told Me Passenger Rear Tire Wears First
01-09-2010, 10:57 PM
#21
Registered User
Originally Posted by SpitfireS,Jan 9 2010, 01:41 AM
You can swap directional tires L/R too, but you have to take them off the wheel.
IMO its best to keep worn-in tires spinning in the same direction.
IMO its best to keep worn-in tires spinning in the same direction.
By running a little more aggressive camber you may be able to reduce shoulder wear due to cornering.
01-10-2010, 12:13 AM
#22
Moderator
Originally Posted by Elistan,Jan 9 2010, 06:29 PM
My open-diff truck will do as you say - too much gas and the inside rear tire spins up all day long.
However my S2000, under certain situations, certainly does behave like your single axle example. During 90-degree right turns, like entering a street, I can hear the inside tire "hopping" as it over-rotates for the distance it's traveling. It's a much different result from the open-diff behavior you describe. IIRC, it's the same reason our cars pull to the side when given gas and one of the rear tires is low on pressure - the LSD acts much like a single axle when under load. (Well, 50% like one, isn't it?)
However my S2000, under certain situations, certainly does behave like your single axle example. During 90-degree right turns, like entering a street, I can hear the inside tire "hopping" as it over-rotates for the distance it's traveling. It's a much different result from the open-diff behavior you describe. IIRC, it's the same reason our cars pull to the side when given gas and one of the rear tires is low on pressure - the LSD acts much like a single axle when under load. (Well, 50% like one, isn't it?)
01-10-2010, 02:37 AM
#24
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Elistan Posted on Jan 10 2010, 12:29 AM
The Torsen works because of rev difference between L&R.
Turning when both wheels have grip (your example) makes it work hard.
Because:
#1 - rev difference & applied torque generates lock.
(like you say it starts to act like a single axle)
#2 - equal grip in slow corners does not allow lock.
What to do?
Rely on Oil.
The diff oil has to allow the gears inside the Torsen to turn at different speeds while those different speeds press the gears together to generate lock.
Torsen claims the unit can run on ATF, but in the S2000 IMO it shouldn't.
The ring & pinion need the GL-5 and so does the Torsen.
I've noticed odd behaviour in slow tight corners myself.
The car acted like it just didn't want to turn in, like understeer, especially under light throttle, or as much throttle as taking the turn could handle.
This behaviour started suddenly, almost overnight.
At that time I had an unknown diff oil, put in by a dealer.
When I bought the car I had engine/trans and diff oil changed by that dealer.
It had been in there for a while but certainly not longer then the official diff OCI.
(I guess you allready see where this is going)
I went to another Honda dealer, one that workes on S2000 regularly, and asked them to check the steering rack as I figured that must have been it (it wasn't)
They put in the SAE 90 GL-5 diff oil, the Honda Marine stuff.
They kept a sample of the oil that came out of the diff, it looked pitch black and was pretty thin compared to the fresh SAE 90.
Probem solved.
Instantly.
In the first corner I allready noticed the change.
Back to normal.
What diff oil are you using?
When was it changed?
IMO, the diff should not lock when both wheels have equal grip.
The oil should deal with it.
When I manuever around on the small parking lot in front of my garage box I sometimes here the bricks move, I guess that is what you describe.
Bricks are slippery, have sand in between them, grass growing, etc. IOW don't have that much grip.
On tarmac I've never heared or noticed it.
During 90-degree right turns, like entering a street, I can hear the inside tire "hopping" as it over-rotates for the distance it's traveling. It's a much different result from the open-diff behavior you describe. IIRC, it's the same reason our cars pull to the side when given gas and one of the rear tires is low on pressure - the LSD acts much like a single axle when under load. (Well, 50% like one, isn't it?)
Turning when both wheels have grip (your example) makes it work hard.
Because:
#1 - rev difference & applied torque generates lock.
(like you say it starts to act like a single axle)
#2 - equal grip in slow corners does not allow lock.
What to do?
Rely on Oil.
The diff oil has to allow the gears inside the Torsen to turn at different speeds while those different speeds press the gears together to generate lock.
Torsen claims the unit can run on ATF, but in the S2000 IMO it shouldn't.
The ring & pinion need the GL-5 and so does the Torsen.
I've noticed odd behaviour in slow tight corners myself.
The car acted like it just didn't want to turn in, like understeer, especially under light throttle, or as much throttle as taking the turn could handle.
This behaviour started suddenly, almost overnight.
At that time I had an unknown diff oil, put in by a dealer.
When I bought the car I had engine/trans and diff oil changed by that dealer.
It had been in there for a while but certainly not longer then the official diff OCI.
(I guess you allready see where this is going)
I went to another Honda dealer, one that workes on S2000 regularly, and asked them to check the steering rack as I figured that must have been it (it wasn't)
They put in the SAE 90 GL-5 diff oil, the Honda Marine stuff.
They kept a sample of the oil that came out of the diff, it looked pitch black and was pretty thin compared to the fresh SAE 90.
Probem solved.
Instantly.
In the first corner I allready noticed the change.
Back to normal.
What diff oil are you using?
When was it changed?
IMO, the diff should not lock when both wheels have equal grip.
The oil should deal with it.
When I manuever around on the small parking lot in front of my garage box I sometimes here the bricks move, I guess that is what you describe.
Bricks are slippery, have sand in between them, grass growing, etc. IOW don't have that much grip.
On tarmac I've never heared or noticed it.
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