Rear Diff clutch plates installed incorrectly from factory
Jul 9, 2011, 04:12 PM
#92
For those looking to replace the drain bolt washers, here are the specs I measured:
Drain bolt diameter = 17.5mm
Fill bolt diameter = 15.8mm
You'll need copper washers that have an inner diameter slightly larger than what I measured, since those are almost exact. The outer diameter is not going to matter much.
Drain bolt diameter = 17.5mm
Fill bolt diameter = 15.8mm
You'll need copper washers that have an inner diameter slightly larger than what I measured, since those are almost exact. The outer diameter is not going to matter much.
Jul 10, 2011, 12:23 PM
#93
I had an autocross event today and was finally able to test this mod out in real world applications. My suspicion was that this mod would benefit road racers more. I confirmed it today. With autocross, the turns can be excrutiatingly slow at times, and you will not slide the rear end out until the boost hits. During really slow corners, the boost may not kick in until you are at the corner exit, which you probably don't need rear end rotation anymore.
I was able to capture a video of the rear end catching me off guard today, so I countersteered in reaction to the slide, as opposed to anticipation. This scenario would have definitely been understeered in the past--more gas would have pushed me off line, outward.
http://www.youtube.com/watch?v=uJlZZ7x9OMI
If you have corners that are faster and you're already in boost rpm mid-corner (road race corners, or bigger autocross venues), you'll do better with this mod then. It'll allow you to rotate the car as you approach the corner exit, therefore, letting you get on the gas sooner.
I was able to capture a video of the rear end catching me off guard today, so I countersteered in reaction to the slide, as opposed to anticipation. This scenario would have definitely been understeered in the past--more gas would have pushed me off line, outward.
http://www.youtube.com/watch?v=uJlZZ7x9OMI
If you have corners that are faster and you're already in boost rpm mid-corner (road race corners, or bigger autocross venues), you'll do better with this mod then. It'll allow you to rotate the car as you approach the corner exit, therefore, letting you get on the gas sooner.
Last edited by Thoe99; Jul 10, 2011 at 12:43 PM.
Jul 10, 2011, 01:46 PM
#94
nice review. after hearing what you say i think i'd definitely recommend the tre 1.5 way for any autoxers not running in STU or lower. car can break loose whenever, and it will have more neutral/oversteer tendency under decel, since the stock diff is a 1 way. i wish i had a gopro, i'll see if I can post a vid one day of the cusco in action, it's pretty ridiculous
Jul 10, 2011, 08:50 PM
#97
IMO You're better off with a TRE MAX LOCK unit.
Reasons for doing a TRE... more plates, rebuilt with new bearings, ring and pinion contact points are precisely aligned, TRE can modify the rear cover to raise the fluid level & add a sight glass, TRE can also beef up the bearing that supports the ring gear end of the diff, by putting in a bearing that can support approx 3 times the load with a CNC'd backhalf. Not to mention gear detailing and shot peening.
You'd have to work for a drivetrain mgfr as an engineer to have a DIY solution that could come close to rivaling Jon's work. But certainly Jon's experience is unmatched.
I sound like a TRE sack swinger because I am. He does amazing work and I think everyone should know it. It transformed my car, and I recommend his rear diff service to ANYONE and EVERYONE with an Evo.
Reasons for doing a TRE... more plates, rebuilt with new bearings, ring and pinion contact points are precisely aligned, TRE can modify the rear cover to raise the fluid level & add a sight glass, TRE can also beef up the bearing that supports the ring gear end of the diff, by putting in a bearing that can support approx 3 times the load with a CNC'd backhalf. Not to mention gear detailing and shot peening.
You'd have to work for a drivetrain mgfr as an engineer to have a DIY solution that could come close to rivaling Jon's work. But certainly Jon's experience is unmatched.
I sound like a TRE sack swinger because I am. He does amazing work and I think everyone should know it. It transformed my car, and I recommend his rear diff service to ANYONE and EVERYONE with an Evo.
Jul 10, 2011, 08:55 PM
#98
Account Disabled
Join Date: Jul 2011
Location: FL
Posts: 34
Likes: 0
Received 0 Likes
on
0 Posts
Jul 10, 2011, 08:58 PM
#99
Account Disabled
Join Date: Jul 2011
Location: FL
Posts: 34
Likes: 0
Received 0 Likes
on
0 Posts
IMO You're better off with a TRE MAX LOCK unit.
Reasons for doing a TRE... more plates, rebuilt with new bearings, ring and pinion contact points are precisely aligned, TRE can modify the rear cover to raise the fluid level & add a sight glass, TRE can also beef up the bearing that supports the ring gear end of the diff, by putting in a bearing that can support approx 3 times the load with a CNC'd backhalf. Not to mention gear detailing and shot peening.
You'd have to work for a drivetrain mgfr as an engineer to have a DIY solution that could come close to rivaling Jon's work. But certainly Jon's experience is unmatched.
I sound like a TRE sack swinger because I am. He does amazing work and I think everyone should know it. It transformed my car, and I recommend his rear diff service to ANYONE and EVERYONE with an Evo.
Reasons for doing a TRE... more plates, rebuilt with new bearings, ring and pinion contact points are precisely aligned, TRE can modify the rear cover to raise the fluid level & add a sight glass, TRE can also beef up the bearing that supports the ring gear end of the diff, by putting in a bearing that can support approx 3 times the load with a CNC'd backhalf. Not to mention gear detailing and shot peening.
You'd have to work for a drivetrain mgfr as an engineer to have a DIY solution that could come close to rivaling Jon's work. But certainly Jon's experience is unmatched.
I sound like a TRE sack swinger because I am. He does amazing work and I think everyone should know it. It transformed my car, and I recommend his rear diff service to ANYONE and EVERYONE with an Evo.
Jul 10, 2011, 09:01 PM
#100
Again though if you need to stick in a particular class this mod (rearranging plates) is the best bet
Jul 10, 2011, 09:01 PM
#101
http://auto.howstuffworks.com/differential4.htm
Since there's more discs, there's more bite. Like how a single disc compares to a twin disc clutch. You can daily a single disc easily every day but when you put 2 clutches in there, it has more friction to grab, which is why twin discs are either "on or off". No smooth engagement.
Jul 10, 2011, 09:12 PM
#102
How our LSDs work is by clutch type.
http://auto.howstuffworks.com/differential4.htm
Since there's more discs, there's more bite. Like how a single disc compares to a twin disc clutch. You can daily a single disc easily every day but when you put 2 clutches in there, it has more friction to grab, which is why twin discs are either "on or off". No smooth engagement.
http://auto.howstuffworks.com/differential4.htm
Since there's more discs, there's more bite. Like how a single disc compares to a twin disc clutch. You can daily a single disc easily every day but when you put 2 clutches in there, it has more friction to grab, which is why twin discs are either "on or off". No smooth engagement.
The spider gears mount on the pinion cross shaft which rests in angled cutouts forming cammed ramps. The cammed ramps are not necessarily symmetrical. If the ramps are symmetrical, the LSD is 2 way. If they are saw toothed (i.e. one side of the ramp is vertical), the LSD is 1 way. If both sides are sloped, but are asymmetric, the LSD is 1.5 way.
http://en.wikipedia.org/wiki/Limited...rential#Clutch Type LSD
Seems like its about set up, not just more plates
Jul 11, 2011, 09:59 AM
#105
Evolving Member
Join Date: May 2003
Location: Cincinnati Ohio
Posts: 224
Likes: 0
Received 0 Likes
on
0 Posts
Sealership Cost
I called my local dealer to see what they would charge to swap the plates.
$1012 + tax
I cant see spending that much to do this. I guess I should just do it myself.
$1012 + tax
I cant see spending that much to do this. I guess I should just do it myself.