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ddnspider ddnspider is offline
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Default Low Cost LSD Upgrade for Q50/Q60-Install w/ Pics - 04-09-2019, 12:09 PM

*Disclaimer- I do not work for or am affiliated with the vendor who makes this LSD upgrade kit. I simply wanted to be the guinea pig to try a lower cost option for an LSD upgrade*

I had looked at the AMS and Z1 diff upgrades and it seems like they were pretty expensive and in some cases required a core or shipping your center section back, so I began researching alternatives. I found a post where someone confirmed that the rearend in our cars is called the "R190" which has been around for quite some time in 1 form or another. When I searched for R190 LSD, I came across a company called Traction Concepts. They've been around for quite awhile in the racing scene (auto-x, rally, drag, etc.) and sell plate style upgrade kits to convert the 1 tire fire into an LSD for $350. They are made to fit inside the existing diff and apply spring pressure to the gears to keep both wheels turning when torque is applied, but still act like an open diff when there is light throttle or tight turns like in a parking lot. Being that you use the same ring/pinion gears, you don't have to worry preload/backlash/break-in etc. Install and go! I talked at length with their engineer who actually stated how robust the R190 rearend is, particularly with this upgrade. He said he has no concerns with 500/600/700 hp. Here is the process for the tear down and pics of the installed upgrade......
PICS HERE: Low Cost LSD Upgrade for Q50/Q60-Install w/ Pics - Infiniti Q50 Forum

Last edited by ddnspider; 04-09-2019 at 12:28 PM..
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ddnspider ddnspider is offline
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Default 04-09-2019, 12:09 PM

PICS wont upload regardless of how many ways I try so here's a link with pics https://www.infinitiq50.org/forum/engine-technical-discussion/127519-low-cost-lsd-upgrade-q50-q60-install-w-pics.html

Boy it helps having access to a lift! Here is the view from underneath prior to teardown:

Make sure the car is in neutral and the parking brake is off.
Begin by taking off the mid-pipe and 2 heat shields along with the cross member.
There are 2 braces- 1 on either side of the diff that must also be removed. Take off the rear sway bar.
Support the rear diff
Mark the rear prop shaft rubber coupler and the final drive companion flange- you must put these back with everything lined up to these marks. Do NOT remove the rubber coupler from the prop shaft. Once its marked you can remove the 3 bolts and gently pry the prop shaft forward to loosen it from the final drive companion flange. Loosen the center bearing mounting bracket on the prop shaft towards the transmission end of the prop shaft. This will allow the prop shaft to slide out of the front of the differential.

There are 2 large bolts on the bottom of the diff that need to be loosened and 1 horizontal bolt at the top of the diff that must be removed. Support the diff and lower it slightly so you can better access the 2 wheel speed sensors and diff vent tube that must be disconnected.
Get a pry bar and gently pry each of the CV axles out of the diff. There will be tension here so take your time and don't damage anything.
Get that that baby out!

Last edited by ddnspider; 04-09-2019 at 12:28 PM..
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ddnspider ddnspider is offline
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Default 04-09-2019, 12:09 PM

Once you have the diff out, drain the oil and start breaking it loose. There are 6 smaller bolts and 4 larger bolts and then just split the 2 halves apart.

We took off the ring gear after marking its location so it went back exactly in the same orientation. Here are the machined axle/pin gears.

Machined gears back in:

LSD upgrade installed with machined gears

NOTE- You MUST remove the 2 clips and 4 dowels after the LSD upgrade is installed in the diff. This is what allows the upgrade kit to do its job and let the spring tension push against the gears.

Last edited by ddnspider; 04-09-2019 at 12:27 PM..
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Default 04-09-2019, 12:10 PM

Once you've got he diff back in the housing, clean off all the grease and dried RTV and put down a light bead of new silicon/RTV. You'll probably have to use a rubber mallet to get the cover back on the diff housing.

Reassembly is the opposite of disassembly. Make sure the CV axles are pushed in all the way and that the C clips were still in place on the axles when you press them back into the housing. You'll have to play with the diff angle and height to get them to slide back in but its not bad. You can reuse the oil seals if they're in good shape.

We got the diff back in and used a pump to refill the diff.
NOTE- The service manual says to fill with 2 1/4 PINTS of oil. We ended up with more like 3 pints (1.5 qt) until it dripped out of the fill plug.
Make sure to reconnect the wheel speed sensors and diff vent tube.

Last edited by ddnspider; 04-09-2019 at 12:27 PM..
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ddnspider ddnspider is offline
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Default 04-09-2019, 12:10 PM

Driving impressions- once we got the car off the lift, I backed out and expected to hear some noise turning or something. NO SOUND. It's like we never did an upgrade at all. Traction Concepts states to take it easy for the first couple hundred miles as well as long slow figure 8s in an empty parking lot so that the kit embeds and "gets to know each other". I did give it to light launches and immediately noticed the sound of TWO tires spinning! I also hit it from a low roll and did NOT get wheel spin which is new to me. So far so good! Once I get a couple hundred miles I'll be comparing the 0 to 60 in the jb4 as well as going back to the drag strip to compare 60ft times.

Last edited by ddnspider; 04-09-2019 at 04:25 PM..
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Default 04-10-2019, 08:42 AM

Impressive - I’m looking forward to your post ‘break in’ results!


2017 Q50 Premium RWD
  • BMS JB4 w/ Fuel Wires
  • BMS CAI w/ Inlets
  • BMS WMI
  • AMS HE
  • AMS LDP
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Default 04-15-2019, 09:47 AM

Pulled a tenth off my best 0-60 (including at the drag strip with no wheel spin) on unprepped surface today by messing with how it shifts and the new LSD...
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ddnspider ddnspider is offline
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Default 04-18-2019, 07:24 AM

Down to 12.4@114. TOO much traction at the track lol. still took 2 tenths off my best 0-60 as well.
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ddnspider ddnspider is offline
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Default 05-01-2019, 12:46 PM

Bumping this up. Been daily driving the car. No noises or issues otherwise. She see's boost typically daily and has been laying 2 stripes of rubber 1000 mile diff fluid change is coming up so we'll see what kind of wear is in there from break-in.
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ddnspider ddnspider is offline
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Default 05-19-2019, 02:36 PM

1000 mile diff change done. Pretty easy to change it actually. Lots of fine particles as expected. Nothing that was alarming and no pieces is always a good thing. Will update next change in another 1000 miles.
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Default 05-19-2019, 04:18 PM

Quote:
Originally Posted by ddnspider
1000 mile diff change done. Pretty easy to change it actually. Lots of fine particles as expected. Nothing that was alarming and no pieces is always a good thing. Will update next change in another 1000 miles.
Sounds promising - still performing equally well after 1k miles I would assume?!?


2017 Q50 Premium RWD
  • BMS JB4 w/ Fuel Wires
  • BMS CAI w/ Inlets
  • BMS WMI
  • AMS HE
  • AMS LDP
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ddnspider ddnspider is offline
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Default 05-19-2019, 04:30 PM

Quote:
Originally Posted by jrobohm
Sounds promising - still performing equally well after 1k miles I would assume?!?
Yup, no noises or issues....just burning 2 tires now instead of 1
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