Rear Diff Options - Power Oversteer Found Here
#1188
EvoM Guru
iTrader: (2)
It also varies from setup to setup. If you lock the rear on decel it'll usually push the rear end less which means the car may understeer more depending on how the suspension is setup and the corner you're going through.
Last edited by Ayoustin; Oct 3, 2018 at 09:39 AM.
#1189
Depends what you're using the car for. 1.5 would help the car rotate better but may upset it at higher braking speeds if set too aggressively, but usually increases braking stability into/through a corner so I could see an advantage for an autox car, and a track car if set properly.
It also varies from setup to setup. If you lock the rear on decel it'll usually push the rear end less which means the car may understeer more depending on how the suspension is setup and the corner you're going through.
#1190
EvoM Guru
iTrader: (2)
Corner exit you should be on the gas, so there wouldn't be a difference between a 1 and 1.5. The 1.5 in most cases will make the car more pushy but I wouldn't move to a 1 way if you're doing track stuff for the same reason track guys don't remove sway bars and autox guys do, high speed stability.
#1191
Corner exit you should be on the gas, so there wouldn't be a difference between a 1 and 1.5. The 1.5 in most cases will make the car more pushy but I wouldn't move to a 1 way if you're doing track stuff for the same reason track guys don't remove sway bars and autox guys do, high speed stability.
There can be a difference under accel depending on the ramp angles for all clutch type diffs - i.e., the 141FG uses an aggressive 55 degree ramp angle, vs it's 141F which I believe is a 45 degree, though they are both 1-way diffs.
That said, if we're talking about high speed stability, and for a given 1-way and 1.5-way that have the same cam angle, what we are referring to is the high speed braking stability, correct? Since under accel they would be the same. So for high-speed braking, the 1-way is going to be open, and the 1.5-way is going to weakly attempt to lock the rear wheels together. While I agree that will lead to more stable braking, how much is needed in sacrifice for corner entry is my question. Right now, I feel I have too much binding in my rear diff.
#1192
EvoM Guru
iTrader: (2)
not to be argumentative, I like these technical discussions:
There can be a difference under accel depending on the ramp angles for all clutch type diffs - i.e., the 141FG uses an aggressive 55 degree ramp angle, vs it's 141F which I believe is a 45 degree, though they are both 1-way diffs.
That said, if we're talking about high speed stability, and for a given 1-way and 1.5-way that have the same cam angle, what we are referring to is the high speed braking stability, correct? Since under accel they would be the same. So for high-speed braking, the 1-way is going to be open, and the 1.5-way is going to weakly attempt to lock the rear wheels together. While I agree that will lead to more stable braking, how much is needed in sacrifice for corner entry is my question. Right now, I feel I have too much binding in my rear diff.
There can be a difference under accel depending on the ramp angles for all clutch type diffs - i.e., the 141FG uses an aggressive 55 degree ramp angle, vs it's 141F which I believe is a 45 degree, though they are both 1-way diffs.
That said, if we're talking about high speed stability, and for a given 1-way and 1.5-way that have the same cam angle, what we are referring to is the high speed braking stability, correct? Since under accel they would be the same. So for high-speed braking, the 1-way is going to be open, and the 1.5-way is going to weakly attempt to lock the rear wheels together. While I agree that will lead to more stable braking, how much is needed in sacrifice for corner entry is my question. Right now, I feel I have too much binding in my rear diff.
A 1.5 in most cases isn't exactly a weak lock up under decel. No one runs a 2 way for track driving because going full lock under decel would make the car twitchy and hard to control properly. The ramps rates between accel and decel do not have to be equal with a 1.5 way and they can be set to lock harder on decel if for some reason that was desired.
Yes, high speed braking/decel where you come off the throttle. I don't see there being a sacrifice in corner entry, if you're understeering then tune that out with the suspension. What makes you feel the there's too much decel lockup?
#1193
My last comment would be assuming that they're using the same ramp angles + have the same amount of clutches etc.
A 1.5 in most cases isn't exactly a weak lock up under decel. No one runs a 2 way for track driving because going full lock under decel would make the car twitchy and hard to control properly. The ramps rates between accel and decel do not have to be equal with a 1.5 way and they can be set to lock harder on decel if for some reason that was desired.
Yes, high speed braking/decel where you come off the throttle. I don't see there being a sacrifice in corner entry, if you're understeering then tune that out with the suspension. What makes you feel the there's too much decel lockup?
A 1.5 in most cases isn't exactly a weak lock up under decel. No one runs a 2 way for track driving because going full lock under decel would make the car twitchy and hard to control properly. The ramps rates between accel and decel do not have to be equal with a 1.5 way and they can be set to lock harder on decel if for some reason that was desired.
Yes, high speed braking/decel where you come off the throttle. I don't see there being a sacrifice in corner entry, if you're understeering then tune that out with the suspension. What makes you feel the there's too much decel lockup?
#1194
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I had John at TRE do a 1.5 way for me. 100% track car and couldn't have been happier.
At the limit a light mid corner lift would help the rear come around. Also enhanced the ability to throttle steer the car around long high speed sweepers.
And made driving it loosy goosy like a rally car far and away better.
Evo's don't like to turn. If you can get the rear to help you'll go faster.
Shoe
At the limit a light mid corner lift would help the rear come around. Also enhanced the ability to throttle steer the car around long high speed sweepers.
And made driving it loosy goosy like a rally car far and away better.
Evo's don't like to turn. If you can get the rear to help you'll go faster.
Shoe
#1197
yea, my ****ing axle won't go back into the diff. i've tried everything, i'm 95% it's the axle snap ring on the passenger's side (driver's side is inexplicably much smaller, and goes in with the force you would expect). i've stood against the wall with both hands on the axle pushing it in, no go. i'm hunting sources for a smaller snap ring. i think it needs ~26mm, this one is 28mm. I spoke with my friends who regularly work on cars and did this the last time the diff was out. they said getting the axle in was the hardest thing they've EVER done on a car. so, yea. I can get the driver's side in with ease now, and not the passenger's side. i ordered from Mitsu, and it's the same oversized ****. The pn seems to have been superceded and it is likely that the new part is larger. I'm contacting a number of places to see what they've got.
#1198
Evolved Member
iTrader: (1)
Sort of relevant to the rear diff... How is it possibly I missed out on this beauty of an aftermarket piece?
https://www.maperformance.com/produc...SABEgLPyvD_BwE
It's $100 cheaper then the Buschur competitor and aluminum. Eliminates 13 pounds from the rear end.
https://www.maperformance.com/produc...SABEgLPyvD_BwE
It's $100 cheaper then the Buschur competitor and aluminum. Eliminates 13 pounds from the rear end.
#1199
EvoM Community Team Leader
iTrader: (60)
Sort of relevant to the rear diff... How is it possibly I missed out on this beauty of an aftermarket piece?
https://www.maperformance.com/produc...SABEgLPyvD_BwE
It's $100 cheaper then the Buschur competitor and aluminum. Eliminates 13 pounds from the rear end.
https://www.maperformance.com/produc...SABEgLPyvD_BwE
It's $100 cheaper then the Buschur competitor and aluminum. Eliminates 13 pounds from the rear end.
#1200
Evolved Member
iTrader: (38)
Sort of relevant to the rear diff... How is it possibly I missed out on this beauty of an aftermarket piece?
https://www.maperformance.com/produc...SABEgLPyvD_BwE
It's $100 cheaper then the Buschur competitor and aluminum. Eliminates 13 pounds from the rear end.
https://www.maperformance.com/produc...SABEgLPyvD_BwE
It's $100 cheaper then the Buschur competitor and aluminum. Eliminates 13 pounds from the rear end.