new 1.5 LSD issues/concerns

[JC71]

 

looking for some help and maybe some insight on others experience with a new LSD.

R34 GT ran and drove beautifully, but always alot of grip loss due to the open R200 rear end, so I just installed a new 1.5 LSD way into the stock open R200 for a ER34. Simple. Everything seemed right.

I test drove for the first time this weekend. as I started to back out the garage the first time slowly with tires straight it sounded and felt like I had a loose or half disconnected drive shaft...that was clucking around loose and shaking entire vehicle, and making it feel like the trans clutch was spontaneously slipping then grabbing very roughly while just letting out pedal slowly.

I backed it out went to pull forward with the same noise, shake and slip grab feeling with hesitation, I turned the tires to back out more and then pulled ahead some same thing but worst because of added wheel resistance (which that I expected) puzzled … pulling it back in checking everything over and finding nothing wrong, I tried it the next day.

same thing, couldn’t believe how it shook everything again making a terrible noise and making it feel like the trans clutch was slipping and grabbing, but I got it out of garage into the driveway, got it straight, drove forward and then reveres a few times in a straight line everything shaking , causing what felt like clutch slip and grab every time, sounded like right behind front driver tire and I could feel it in the floor board with my feet,... worst right when beginning to let clutch pedal out to engage slightly, shuttering and sounding terrible along the way…I managed to slowly get down the road, babying it the whole way, once I was rolling (out of 1^st) seemed to be better and between shifts, then clutch felt closer to normal…not slip/ grab etc., but back down to any stop, straight road or turning, same thing. Made no difference if all tires were straight or if I was turning. All other gauge read out correct.

with in 2 miles as planned I reached the empty parking lot and performed the break in procedure that came with lsd, essentially to drive in a figure 8 a bunch.  Did this, binding chattering, and shaking the car the whole way. I drove it back home seemed somewhat normal once I was in straight line and past 10 mph or so, and I know it will “bind” on corners and cause some tires squeal when turning especially from a stop, but when I begin to move it still causes what feels like the trans clutch to slip and jerk badly as well as shaking the entire car, and sounds terrible, that I didn’t expect.

I used the fluid they supplied with LSD kit and did the breaking, planning to change fluid as they suggest after breaking, but wondering will it get smoother or less aggressive with use?

maybe a 1.5 is just too aggressive for normal road driving?

 

I have a LSD that I put in my 71 cuda when I restored it, with amazing smooth , quite yet effective results.

Different style LSD but that ones a joy to drive. maybe expecting too much from this R200?

Edited Monday at 11:56 AM by JC71

[JC71]

Clutch is a spec brand, new clutch system,( PP, flywheel, friction disc, etc. pull type) installed 100 miles ago, with no problems.

[Kinkstaah]

What 1.5 way? There's no such thing really as a 1.5 way, just different ways of explaining 2 ways with different ramp rates.

HOWEVER.

In any driving in a straight line your 1.5 or 2 or 1.7 way should have no clunking at all. With the clutch fully depressed the diff should be silent (unless it's welded but I'm assuming it's not).

Something aint right here.

[JC71]

sold listed as a Tomei LSD 1.5 Way For 1998+ Nissan Skyline ER34 25GT RB25DE w/Open R200

https://www.ebay.com/itm/174006114594?campid=5338967980&mkevt=1&mkcid=1&toolid=10050&customid=&mkrid=711-53200-19255-0&loc_physical_ms=108689&loc_interest_ms=&campid=5338967980&mkevt=1&mkcid=1&toolid=10050&customid=71883f2ccc571356e0a757bc7adfdde2&mkrid=710-53481-19255-0&loc_physical_ms=108689&loc_interest_ms=

it went in like butter all gears, alignment, back lash etc, rotation and clearances correct, and if rolling all rotates smooth and free when coasting down road , clutch in or out over 10 mph smooth... its the binding, clunking and jerking from a stop that is most concerning, also seems like its going to tear the tires off in 10 miles of normal road driving. 

Edited Monday at 01:41 PM by JC71

[MBS206]

7 hours ago, Kinkstaah said:

What 1.5 way? There's no such thing really as a 1.5 way, just different ways of explaining 2 ways with different ramp rates.

HOWEVER.

In any driving in a straight line your 1.5 or 2 or 1.7 way should have no clunking at all. With the clutch fully depressed the diff should be silent (unless it's welded but I'm assuming it's not).

Something aint right here.

Even welded diff, in a dead straight line is quiet. It's what's in my R33, and you only notice it is welded when attempting to turn.

 

This to me sounds like there is play somewhere. But I'm not sure where I'd look to be honest.

 

OP: are your tyres the same size left to right?

Can you check what the markings on the rear left and rear right tyre are, and then how much tread is on each tyre?

[Dose Pipe Sutututu]

What fluids are you using? 

[JC71]

the Tomei LSD fluid with lsd kit. frustrated that it was shaking the car to crap and affecting everything else negatively, I pulled the diff last night, and removed the lsd carrier, could not find anything wrong, however it seem to be 100 locked up acceleration, and deacceleration, wondering if they sent me a 2 way not a 1.5??  either way I installed the stock open carrier back in place. test drove everything smooth as butter again. no shake, shutter, random, what felt like clutch slip and grab or drive shaft play, etc. something differently wrong in side the lsd. I might bother taking it apart (if possible) to figure out what's going on inside this carrier, as bought too long ago to return.  only draw back is its back to a one wheel wonder.

Edited yesterday at 01:17 PM by JC71

[GTSBoy]

A 1.5 way is a 2 way. It is just a 2 way with a less aggressive ramp on overrun.

[MBS206]

8 hours ago, JC71 said:

the Tomei LSD fluid with lsd kit. frustrated that it was shaking the car to crap and affecting everything else negatively, I pulled the diff last night, and removed the lsd carrier, could not find anything wrong, however it seem to be 100 locked up acceleration, and deacceleration, wondering if they sent me a 2 way not a 1.5??  either way I installed the stock open carrier back in place. test drove everything smooth as butter again. no shake, shutter, random, what felt like clutch slip and grab or drive shaft play, etc. something differently wrong in side the lsd. I might bother taking it apart (if possible) to figure out what's going on inside this carrier, as bought too long ago to return.  only draw back is its back to a one wheel wonder.

Since you came here to ask for help, have you thought about answering our questions, that might help us lead you to why it was skipping, or have you given up on getting advice?

[Dose Pipe Sutututu]

Is this a brand new LSD? if so, have you followed any break/bed in procedure for it?

Usually involves heaps of figure 8 patterns, a fluid flush.

[JC71]

all brand new unit from Tomei, fluid, bearings, etc.

Tomei said they call it a 1.5 lsd because its 100 percent lock up under acceleration and 50 percent under deacceleration. 

as I mentioned I used their fluid, install and their break-in procedure, (alot of figure 8's) but even when driving straight, or even slowly backing out of garage for first time, (at 2 mph) then driving to and from figure 8 parking lot, each tire in the rear would sporadically grab, skip, bounce, shutter and skip, shutter back a force I could feel causing clutch to slip then grab, at any speed. shaking entire car. I removed unit, since I put stock back in and all is fine, via process of elimination, its something with the lsd unit itself.

I wasn't going to beat up the entire car more or change anything else for no reason as I had a feeling something in the lsd itself was wrong as everything was fine before this alone was installed and I rechecked over everything else after first time backing out I suspected an issue. I'll probably sadly already need new tires now just from trying to drive it 5 miles and performing the figure 8 break in.

but if someone has any ideas I'm all ears 

Edited 7 hours ago by JC71

[Dose Pipe Sutututu]

Have you flushed the initial fluid yet?

It should look like a rainbow unicorn shat glitter into it. 2nd or 3rd fluid change is when you party.

[GTSBoy]

2 hours ago, JC71 said:

shutter

I gotta pull you up on this. It's driving me crazy. A shutter is something that closes, like over a window or in a cmera. The word you want is shudder.

That LSD is clearly f**ked. Take it to a diff shop and get it disassembled and examined by an expert. YOu might have plates welded together or something equally crazy.

[Murray_Calavera]

He still hasn't said what the fluid was, saying "Tomei fluid" isn't enough detail. 

Using my crystal ball, sounds like the diff oil was 80W90, that is the only "Tomei fluid" I can find anyway. 

This problem might have been solved in 5 seconds by using a decent 80w-140 oil. 

[MBS206]

6 hours ago, JC71 said:

but if someone has any ideas I'm all ears 

Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.