Tre Rear Differential Upgrade Service
#136
Evolving Member
iTrader: (5)
The Cusco 40/60 that is being referred to is the center diff and that is located in the transmission and it will bias the torque split between front and rear differentials.
Having more bias towards the rear of the car is good for making the EVO finish the turn while having your boot on the throttle but this only works if the rear inside tire doesn't spin into smoke because the rear diff can't provide the necessary lock-up.
If the rear diff can provide enough lock-up the car will enjoy the advantage of better acceleration while exiting out of a turn. Also, the driver can steer the car out of the turn with throttle thus unwinding the steering wheel sooner and anytime that you can use the throttle more and steering less the car will be quicker around the track.
Now understand that too much lock-up can be just as bad as having the suspension set up wrong and based off the feedback from the test group it sounds like the rear diff upgrade is working properly, providing the ideal amount of lock-up without making the car squirrelly.
#137
Evolved Member
Thread Starter
iTrader: (66)
Join Date: Jul 2005
Posts: 1,606
Likes: 0
Received 0 Likes
on
0 Posts
So, let me see if I understand:
A perfect combo would be: A properly built TRE tranny with the cusco 60/40, a TRE re-manned t-case with ralliart or quaife front diff. and a TRE re-manned rear diff upgrade with adequate locking
This would then allow to opt for a softer rear suspension perhaps as the car will rotate more as-is without the need for a big rear bar or stiff rear springs...
Good to know I am 2/3rd's of the way there, Jon! Thanks for all your help and great customer service!
A perfect combo would be: A properly built TRE tranny with the cusco 60/40, a TRE re-manned t-case with ralliart or quaife front diff. and a TRE re-manned rear diff upgrade with adequate locking
This would then allow to opt for a softer rear suspension perhaps as the car will rotate more as-is without the need for a big rear bar or stiff rear springs...
Good to know I am 2/3rd's of the way there, Jon! Thanks for all your help and great customer service!
#138
Evolved Member
Thread Starter
iTrader: (66)
Join Date: Jul 2005
Posts: 1,606
Likes: 0
Received 0 Likes
on
0 Posts
I figured readers can see that you offer more than just 1 option based on their needs and type or racing....
#139
Evolved Member
iTrader: (22)
Join Date: Nov 2004
Location: CT
Posts: 1,427
Likes: 0
Received 0 Likes
on
0 Posts
So, let me see if I understand:
A perfect combo would be: A properly built TRE tranny with the cusco 60/40, a TRE re-manned t-case with ralliart or quaife front diff. and a TRE re-manned rear diff upgrade with adequate locking
This would then allow to opt for a softer rear suspension perhaps as the car will rotate more as-is without the need for a big rear bar or stiff rear springs...
Good to know I am 2/3rd's of the way there, Jon! Thanks for all your help and great customer service!
A perfect combo would be: A properly built TRE tranny with the cusco 60/40, a TRE re-manned t-case with ralliart or quaife front diff. and a TRE re-manned rear diff upgrade with adequate locking
This would then allow to opt for a softer rear suspension perhaps as the car will rotate more as-is without the need for a big rear bar or stiff rear springs...
Good to know I am 2/3rd's of the way there, Jon! Thanks for all your help and great customer service!
John
#140
Evolving Member
iTrader: (5)
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
#141
Evolved Member
Thread Starter
iTrader: (66)
Join Date: Jul 2005
Posts: 1,606
Likes: 0
Received 0 Likes
on
0 Posts
Thanks for listing this out clearly, Jon
PS - PM or email me back as to the details on my TC you are finishing up on. I tried calling, but no answer. I understand you are busy and probably have a bunch of stuff to get done and I don't want to chat your ear off like last time
PS - PM or email me back as to the details on my TC you are finishing up on. I tried calling, but no answer. I understand you are busy and probably have a bunch of stuff to get done and I don't want to chat your ear off like last time
#142
Evolved Member
iTrader: (17)
Join Date: Apr 2004
Location: 41° 59' N, 87° 54' W
Posts: 6,224
Likes: 0
Received 0 Likes
on
0 Posts
Wanted to provide some additional feedback on the rear diff upgrade: simply put ... IT WORKS! Had the chance to slide the car around a bit last week, and the car barely pushed (if at all) under power coming out of hard corners. This is on a stock '03 suspension with only minor upgrades (rear trailing arm bushing and rear strut tower brace). I'm very happy. IMO one of the better, lower cost upgrades I've put on my car.
On a separate note, the AMS solid rear diff mount is nice, but probably too noisy for prolonged street use...
l8r)
On a separate note, the AMS solid rear diff mount is nice, but probably too noisy for prolonged street use...
l8r)
#143
Evolved Member
Thread Starter
iTrader: (66)
Join Date: Jul 2005
Posts: 1,606
Likes: 0
Received 0 Likes
on
0 Posts
Thanks, Ludi. I am exicted. My rear diff. is here. My TC is on the way back. I wish Devo had the lightweight driveshaft ready as well so I could bolt on the stuff. Damn CF one costs a metric azzton pounds, else I would just get that!
#144
Evolved Member
iTrader: (18)
I finally had the chance to put the rear diff to the test this past weekend, and I was impressed. I had several changes made over the off-season, so it's tough to make a side-by-side comparison between regular rear diff and TRE rear diff, but from my experience the TRE rear diff was well worth it.
TRE did my rear diff, along with installing a front LSD in my t-case (as well as a Stage 2 tranny rebuild). I took the Evo to an autocross at Devens, MA this past weekend, and I and Point&Shoot, who co-drove with me, put it thru its paces.
The car handled very well, with a HUGE difference in the amount of understeer it exhibited. While I'm sure the front LSD helps eliminate some of it, teaming it with the TRE rear diff made the Evo become a much better balanced vehicle. It wasn't overly tail-happy, but it certainly rotated when needed. The grip and balance was even more impressive when you consider this was all on year-old R compounds and mid-50s temps....
TRE did my rear diff, along with installing a front LSD in my t-case (as well as a Stage 2 tranny rebuild). I took the Evo to an autocross at Devens, MA this past weekend, and I and Point&Shoot, who co-drove with me, put it thru its paces.
The car handled very well, with a HUGE difference in the amount of understeer it exhibited. While I'm sure the front LSD helps eliminate some of it, teaming it with the TRE rear diff made the Evo become a much better balanced vehicle. It wasn't overly tail-happy, but it certainly rotated when needed. The grip and balance was even more impressive when you consider this was all on year-old R compounds and mid-50s temps....
#147
Evolving Member
iTrader: (1)
Join Date: Jan 2004
Location: Lex, KY
Posts: 234
Likes: 0
Received 0 Likes
on
0 Posts
EJ and Ludi: just to clarify, are you guys on stock center diffs or have those been upgraded as well? I just want to make sure I dont need a new center as well before I install the rear diff.
To the collective: would using the 1.5 or 2 way diff be good to also induce rotation on corner entry? Or would this be too much upsetting of the car and be less effective than setting up early for the turn or using trail braking?
To the collective: would using the 1.5 or 2 way diff be good to also induce rotation on corner entry? Or would this be too much upsetting of the car and be less effective than setting up early for the turn or using trail braking?
#149
Evolving Member
iTrader: (3)
Join Date: Aug 2003
Location: Lexington, MA
Posts: 222
Likes: 0
Received 0 Likes
on
0 Posts
EJ and Ludi: just to clarify, are you guys on stock center diffs or have those been upgraded as well? I just want to make sure I dont need a new center as well before I install the rear diff.
To the collective: would using the 1.5 or 2 way diff be good to also induce rotation on corner entry? Or would this be too much upsetting of the car and be less effective than setting up early for the turn or using trail braking?
To the collective: would using the 1.5 or 2 way diff be good to also induce rotation on corner entry? Or would this be too much upsetting of the car and be less effective than setting up early for the turn or using trail braking?
Mike
#150
Evolving Member
iTrader: (1)
Join Date: Jan 2004
Location: Lex, KY
Posts: 234
Likes: 0
Received 0 Likes
on
0 Posts
I just installed the evo9 front diff (sourced from TRE, and very quickly at that) and it was definitely a noticable difference, which is all the more reason I like the idea of the rear diff rebuild as well. And with all that Ive put into upgrades this year, after a new set of r-comps, this will be all I can afford.