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nsx-r diff conversion

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This DIY is NOT for everyone,but with that said, if you have your trans out and you are rebuilding it or a shop is rebuilding it ,it does not cost much more to do this upgrade and is well worth it. Here is the vid I made when I converted my diff to a NSX-R diff. Hope it helps someone.. Also special thanks to LarryB who helped when I needed <iframe width="420" height="315" src="http://www.youtube.com/embed/tn2oF8rT6io" frameborder="0" allowfullscreen></iframe>
 
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goldNSX

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Thanks, I'll need this in the near future.
 
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I am not sure I know this... what exactly is the difference between the standard and the R?
 
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I am not sure I know this... what exactly is the difference between the standard and the R?

The standard "unlocks" at about 50 lb/ft of torque. The R unlocks at a little over 100. Essentially, it keeps the rear wheels locked together longer, so you have more power to the outside wheel when coming out of a corner. I have this mod and I love it, though it is only apparent under very spirited driving.
 
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here is a vid I made when I converted my diff to a NSX-R diff. Hope it helps someone.. Also special thanks to LarryB who helped when I needed <iframe width="420" height="315" src="http://www.youtube.com/embed/tn2oF8rT6io" frameborder="0" allowfullscreen></iframe>

Does this conversion only work on a LSD 6speed also? or only on the 5 speed LSD

Bryan
 
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The standard "unlocks" at about 50 lb/ft of torque. The R unlocks at a little over 100. Essentially, it keeps the rear wheels locked together longer, so you have more power to the outside wheel when coming out of a corner. I have this mod and I love it, though it is only apparent under very spirited driving.

Why didn't Honda make them all this way? :confused:
 
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Does this conversion only work on a LSD 6speed also? or only on the 5 speed LSD

Bryan

The type r differential is actually a 5 spd diff since the regular 6 spd is not compatible w power steering. Not sure about the shimming but I think you can shim either one.
 
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Thanks for posting the video! Very informative. :)
 
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Why didn't Honda make them all this way? :confused:

I believe it was a "comfort" issue. Supposedly, the tighter lockup makes the car harder to turn during very slow maneuvering, i.e., parking. The NSX-R was designed as a "track day" NSX, so the primary concern was performance, not comfort. Some people claim to be able to feel the diffeerence during parking. I can't.

The type r differential is actually a 5 spd diff since the regular 6 spd is not compatible w power steering. Not sure about the shimming but I think you can shim either one.

The 6-speed Diff first appeared in the 95+ 5-speeds. It is a helical, torsen type diff, unlike the 91-94 model, which is a spring-loaded clutch. Thus, there is no need to shim the 6-speed diff because it is gear-driven. Unlike the spring-loaded clutch, which only has one preset breakaway, the helical version locks tighter as you turn harder,meaning you end up with likely more than 100 lb/ft of breakaway at track speeds. I think it is a superior design and Honda claims 10% better corner exit speed (compared to the stock NA1)
 
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I believe it was a "comfort" issue. Supposedly, the tighter lockup makes the car harder to turn during very slow maneuvering, i.e., parking. The NSX-R was designed as a "track day" NSX, so the primary concern was performance, not comfort. Some people claim to be able to feel the diffeerence during parking. I can't.



The 6-speed Diff first appeared in the 95+ 5-speeds. It is a helical, torsen type diff, unlike the 91-94 model, which is a spring-loaded clutch. Thus, there is no need to shim the 6-speed diff because it is gear-driven. Unlike the spring-loaded clutch, which only has one preset breakaway, the helical version locks tighter as you turn harder,meaning you end up with likely more than 100 lb/ft of breakaway at track speeds. I think it is a superior design and Honda claims 10% better corner exit speed (compared to the stock NA1)

Man good to know honcho! I read that in my little guide about changes for the 95 model year (corner exit speed increased by 10% due to new diff) but I didn't know they kept using it for the consequent years.
 
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Yes thanks for clearing that up Honcho.
 
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Chris how do you like that setup? I was going to do the same thing but I am rethinking it.
 
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Chris how do you like that setup? I was going to do the same thing but I am rethinking it.

I guess, I have to love this setup due to the cost of a 6 speed trans, NSX-R 4.23 twin imput shaft.

Really I don't think the performance gains outweigh the cost of this upgrade. When I did this transmission, there weren't much options for clutches for the 6 speed trans. My options were stock, RPS and Comptech and the pedal feel was too firm for me. That's why I went with the NSX-R twin imput shaft.

I had a Comptech clutch in my first NSX and it sucks driving in traffic.

You will need to source a 91-94 5 speed diff to do NSX-R 4.23 in a 6speed transmission.
 

goldNSX

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A different question to those who opened the diff and had a sight on the diff clutch discs: how many miles do they last? Did anybody have to change them?
 
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Very cool. So all that is needed are the two parts that you mention in the video? Where can they be obtained, and are they expensive? I might like to do this if I pull my trans to upgrade to the short gears and 4.23 final drive.
 
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Very cool. So all that is needed are the two parts that you mention in the video? Where can they be obtained, and are they expensive? I might like to do this if I pull my trans to upgrade to the short gears and 4.23 final drive.
You can get the parts at SOS for around 100 bucks. Most dealers wont have the parts that end in J00 as these are JDM parts. The part numbers are listed in the video.
 
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A different question to those who opened the diff and had a sight on the diff clutch discs: how many miles do they last? Did anybody have to change them?

Apparently a very long time. Before we opened my diff- we tested the breakaway and it was well within spec. The discs looked fine with plenty of life left. My diff had ~80,000 miles at the time. I think an important thing to note is that Honda OEM MTF probably helps with the wear.
 
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Sigh I just did the short gears and final drive. Guess I gotta open up the tranny again
 
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A different question to those who opened the diff and had a sight on the diff clutch discs: how many miles do they last? Did anybody have to change them?
That diff that you see in the video has 130000 miles on it and you can see no wear on the clutches.I certainly think that Honda overbuilt this part of the car.
 
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Back from the dead. Thank you for the video.

I broke the snap ring in my 92 a few weeks ago. I had already replaced the transmission about 8+ years ago with one that had all the JDM gears and typeR FD.
I was able to source a new casing and so I'm not sure if this transmission also had the TypeR differential conversion already done to it.
Since I have to open up the transmission, might as well buy the conversion kit and have it ready.
 
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