Tre Rear Differential Upgrade Service
Don't know, I've never driven a 1 way. i don't have any complaints though. I think ours is adjustable 1.5 to 1way. I might have to try it out if you think 1 way is better.
Evolving Member
Joined: Nov 2007
Posts: 151
Likes: 0
From: SoCal
not upgrading cause they are weak.. upgrading from a weak limited slip diff (in terms of locking ability) to stronger limited slip diff (with greater locking ability) for better corner exit... The stock LSD does not have the holding capacity of many aftermarket units that can lock/reduce inside wheelspin that is prevalent in the EVO). Read the thread..
For the rear, it greatly depends/varies from platform to platform. It seems that 1.5-ways work well for the EVO and it could be a due to the dynamics of the chassis and its tendency to pick up the inside rear wheel.
Nils - are you running a 1.5-way rear? You have the best handling EVO i've ever driven!
Last edited by stuntman; Mar 31, 2009 at 08:57 PM.
Fixed that for you...
In a FWD application, or the front of an AWD car, a 1.5-way LSD has more lockup (keeping the front wheels at closer to the same speed) compared to a 1-way LSD which only has the pre-load of the clutch stack and minimal locking of the front axle on deceleration. Keeping the front wheels rotating at the same speed can reduce turn-in and front grip under deceleration. I would also recommend a 1-way LSD for the front.
For the rear, it greatly depends/varies from platform to platform. It seems that 1.5-ways work well for the EVO and it could be a due to the dynamics of the chassis and its tendency to pick up the inside rear wheel.
Nils - are you running a 1.5-way rear? You have the best handling EVO i've ever driven!
In a FWD application, or the front of an AWD car, a 1.5-way LSD has more lockup (keeping the front wheels at closer to the same speed) compared to a 1-way LSD which only has the pre-load of the clutch stack and minimal locking of the front axle on deceleration. Keeping the front wheels rotating at the same speed can reduce turn-in and front grip under deceleration. I would also recommend a 1-way LSD for the front.
For the rear, it greatly depends/varies from platform to platform. It seems that 1.5-ways work well for the EVO and it could be a due to the dynamics of the chassis and its tendency to pick up the inside rear wheel.
Nils - are you running a 1.5-way rear? You have the best handling EVO i've ever driven!
are you saying the best set up is 1 way for the front, and the 1.5 way for the rear?
Evolving Member
Joined: Nov 2008
Posts: 269
Likes: 0
From: IL
For those who want max lock-up I'm working on a 16 friction plate rear diff but this would be best for those who are in the loose slippery stuff (snow, mud or ice). I'm guessing that it'll have too much lock-up for pavement and the car might become a bit squirrelly after the apex when the throttle is mashed.
1-way type is only providing lock-up when accelerating. Both neutral throttle and decel will act just like an open differential.
1.5-way offers works just like the 1-way except it will provide a little bit of lock-up on decel. Neutral throttle will act like an open differential.
2-way will offer lock-up during both accelerating and decel but to a lesser degree being that the ramps on the side sheaves mustn't have to much angle of the backlash will beat up the cross shaft and ramp profiles. Neutral throttle will act like an open differential.
From what I've gathered, the pro's like a 1-way diff being that they want to have the car free of influence during decel so it won't upset the suspension or turn-in characteristics while rookies may like the forgivingness of slower turning that a 1.5 way offers.
2-way is going to provide lock-up in both directions and this can be an advantage when the driver wishes for the rear of the car to get loose and rotate during well timed downshifts that are often found in rally or Tokyo drift type driving. Again, I'm not the guru race car driver and would like to hear other people's take on what works for them.
Jon
1-way type is only providing lock-up when accelerating. Both neutral throttle and decel will act just like an open differential.
1.5-way offers works just like the 1-way except it will provide a little bit of lock-up on decel. Neutral throttle will act like an open differential.
2-way will offer lock-up during both accelerating and decel but to a lesser degree being that the ramps on the side sheaves mustn't have to much angle of the backlash will beat up the cross shaft and ramp profiles. Neutral throttle will act like an open differential.
From what I've gathered, the pro's like a 1-way diff being that they want to have the car free of influence during decel so it won't upset the suspension or turn-in characteristics while rookies may like the forgivingness of slower turning that a 1.5 way offers.
2-way is going to provide lock-up in both directions and this can be an advantage when the driver wishes for the rear of the car to get loose and rotate during well timed downshifts that are often found in rally or Tokyo drift type driving. Again, I'm not the guru race car driver and would like to hear other people's take on what works for them.
Jon
Fixed that for you...
For the rear, it greatly depends/varies from platform to platform. It seems that 1.5-ways work well for the EVO and it could be a due to the dynamics of the chassis and its tendency to pick up the inside rear wheel.
Nils - are you running a 1.5-way rear? You have the best handling EVO i've ever driven!
For the rear, it greatly depends/varies from platform to platform. It seems that 1.5-ways work well for the EVO and it could be a due to the dynamics of the chassis and its tendency to pick up the inside rear wheel.
Nils - are you running a 1.5-way rear? You have the best handling EVO i've ever driven!
To me it sounds as if the only place it does anything is a full throttle lift. It seems as if it acts as a bit of rear brake and settles the car on turn in, but shouldn't affect slaloms or offsets that are steady (neutral) throttle. I like the fact that the 1 way is totally off on turn in and the chassis is allowed to do it's thing until you get back in the throttle. Maybe for the track at high speeds the 1.5 way is more desirable.
Either way I don't really know, I've only driven a OEM diff and 1 way.
John
Evolving Member
Joined: Nov 2008
Posts: 269
Likes: 0
From: IL
Does 1 way lock more than 1.5 way/ Have more surface area?? I thought they all had the same.. Which is the more "extreme" setting? 1.5 right? I thought the only thing difference was the bit of lock up on decel
And before you go lighting the witch hunt torches on the forum, yes initially you may notice the clutch plates making some noise while taking tight turns. This is completely normal while they are bedding in. You may speed this process up by doing figure 8's in a parking lot. Also you will hear more noise from the rear diff when you change the sloppy rubber bushings over to solid bushings, if you're going to replace the rear bushing keep in mind that solid metal bushings are going to transmit a lot more noise into the car. I'd option for polyurethane over metal.
I have the same noise as you. Backing up and turning, occasional slow 90 deg turns from a stop. Mostly starting slowly from a stop. Pretty unsettling. Sounds like something is broken. I even sent mine back to Jon. He checked it and it was fine. I think that it is normal for this setup.
I have the same noise as you. Backing up and turning, occasional slow 90 deg turns from a stop. Mostly starting slowly from a stop. Pretty unsettling. Sounds like something is broken. I even sent mine back to Jon. He checked it and it was fine. I think that it is normal for this setup.
LMFAO, I sent mine back to him too fearing the worst. All was well.
