R200 LSD options/setup

Engine, Transmission and related drivetrain.
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jeffball610
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Re: R200 LSD options/setup

Post by jeffball610 » 08 Jan 2019 20:28

I found this video by KAAZ that seems identical to the clutch type LSD that Tomei makes. They show how to adjust the lockup from 100% to 80% or 65%.

https://youtu.be/dYG3G7fQdi8
1972 Datsun 510
7-bolt 4G63T, EVO 9 pistons & rods, Garrett GT3076R, "Flipped" Stock Intake Manifold, Toyota R154, Z31 R200 w/ CVs

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JordanTr
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Re: R200 LSD options/setup

Post by JordanTr » 09 Jan 2019 18:16

Yep that sounds like exactly what you need to do. Like you said, they are reducing the number of slip planes so it therefore reduces the breakaway. Pretty smart really.

I think you've got er Jeff!

I would change my recommendation from before to just the recommended Redline treat rate if you are going to reduce the torque down to 65% of original.

Please update with burnout vids. :twisted:
Jordan | '72 2 door KA project | '94 240sx RB26DETT | '97 Silvia RB25DET | '90 Audi 90 Quattro 20V (DD)

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jeffball610
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Re: R200 LSD options/setup

Post by jeffball610 » 19 Jan 2019 15:19

It's installed and broken in. I haven't taken it out yet since I changed the fluid, but my initial impressions are it's noisy and clunky. I assume it just needs to break in more, but I'm sure I have some bushings that need some refreshing.
Image
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I still don't have a proper torque reading. I followed the Factory Nissan manual for checking the torque at the wheel, but it just says if it's within spec or not. I got a reading of about 60ft/lbs before break in, and about 50ft/lbs after using a torque wrench with about a 16" handle.. According to the manual, that's within spec, but I have no idea what the actual reading is. I'm sure there is a math equation that I can calculate it, but I don't know it off hand. Anyone have input?
Image

Small update: I took it out for spin. The clunking only seems to be at low speeds. I guess I just need to drive more aggressively :-)
1972 Datsun 510
7-bolt 4G63T, EVO 9 pistons & rods, Garrett GT3076R, "Flipped" Stock Intake Manifold, Toyota R154, Z31 R200 w/ CVs

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JordanTr
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Re: R200 LSD options/setup

Post by JordanTr » 19 Jan 2019 16:28

Are you using a bending beam or click type torque wrench?

Need a bending beam to really do this accurately.

I can help you work through the force/moment balance later.
Jordan | '72 2 door KA project | '94 240sx RB26DETT | '97 Silvia RB25DET | '90 Audi 90 Quattro 20V (DD)

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Byron510
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Re: R200 LSD options/setup

Post by Byron510 » 21 Jan 2019 23:46

Just as a passing note; when I installed my new Precision gear CLSD years ago- it sounded like a bag of hammers Out of the box. I seriously thought it was broken. After putting a few miles on it, and adding a bottle of GM LSD fluid, I found a parking lot that I could drive around in tight to tighter circles both turning right, then turning left for 5 minutes at at time until I thought I was so dizzy that I was going to puke....

But it did get the fluid between the clutch plates and the diff sounded and worked much better from that point onwards.

You’ll find that once the fluid is between the plates, your break away torque will call a bit. So at roughly 50lbs - your close. I wouldn’t want to drive it much night unless you’re on R compounds or race rubber.

:-)

Byron
Love people and use things,
because the opposite never works.

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jeffball610
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Re: R200 LSD options/setup

Post by jeffball610 » 22 Jan 2019 20:20

Byron510 wrote:
21 Jan 2019 23:46
Just as a passing note; when I installed my new Precision gear CLSD years ago- it sounded like a bag of hammers Out of the box. I seriously thought it was broken. After putting a few miles on it, and adding a bottle of GM LSD fluid, I found a parking lot that I could drive around in tight to tighter circles both turning right, then turning left for 5 minutes at at time until I thought I was so dizzy that I was going to puke....

But it did get the fluid between the clutch plates and the diff sounded and worked much better from that point onwards.

You’ll find that once the fluid is between the plates, your break away torque will call a bit. So at roughly 50lbs - your close. I wouldn’t want to drive it much night unless you’re on R compounds or race rubber.
The unit seems much better the more I drive it, and it really only makes noise or clunks during low speed tight turns while on throttle. At higher speeds and gentler turns, it doesn't make a sound. I still have no trouble breaking tracking through second gear, but it seems more in control based on the little hooning I've done so far. I hope to put a few more miles on it before the road course event this weekend. Now if I can only sort out the brakes so I don't die.
1972 Datsun 510
7-bolt 4G63T, EVO 9 pistons & rods, Garrett GT3076R, "Flipped" Stock Intake Manifold, Toyota R154, Z31 R200 w/ CVs

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bertvorgon
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Re: R200 LSD options/setup

Post by bertvorgon » 23 Jan 2019 09:17

Just to confirm you are not alone....my diff clunks and thunks on slow speed, tighter turns, just a function of the diff being locked up. You should have heard mine on full race slicks, sounded like it was blowing up.

It's not bad now after after 36 years of use!
"Racing makes heroin addiction look like a vague wish for something salty" - Peter Egan

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1973 2Door Slalom/hill climb/road race / canyon carver /Giant Killer 510
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icehouse
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Re: R200 LSD options/setup

Post by icehouse » 23 Jan 2019 12:27

Byron510 wrote:
21 Jan 2019 23:46
Just as a passing note; when I installed my new Precision gear CLSD years ago- it sounded like a bag of hammers Out of the box. I seriously thought it was broken. After putting a few miles on it, and adding a bottle of GM LSD fluid, I found a parking lot that I could drive around in tight to tighter circles both turning right, then turning left for 5 minutes at at time until I thought I was so dizzy that I was going to puke....

But it did get the fluid between the clutch plates and the diff sounded and worked much better from that point onwards.

You’ll find that once the fluid is between the plates, your break away torque will call a bit. So at roughly 50lbs - your close. I wouldn’t want to drive it much night unless you’re on R compounds or race rubber.

:-)

Byron

The 180 LSD I bought was the same way! So bad at first. So loud and clunky.
"People don't like it when shit doesn't match their rule of thumb." Sam

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