is it safe for me to use 2.5 quarts of GL-5/80W-90 gear oil in a b series tranny? any info would help or recommendations of what i can use.

some people say use GM synchromesh with friction modifier


or GL-5/80W-90 gear oil w/lsd additive

which one is best for clutch type lsd?


Modified by OhMyEG at 11:41 PM 12/11/2007

 

Honda/Acura's were made to take fluid similar to a 5w30-10w30 type. If you put a heavier fluid it will burn up the transmission....I see this happen a lot when shops mistakingly put the wrong fluid in a Honda/Acura trans and a month later the car is back in the shop with bad trans.

Problem with some clutch type LSDs is the manufacturer wants you to use the fluid that is compatible with their product and that fluid is not always compatible with the transmission.

 

i figured that stuff was too heavy weighted. so what do you have in mind that i should use with this carbon lsd?

 

http://www.carbonetic.net/products/lsdoil.html

I thought it would be obvious.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RagingAngel &raquo;</TD></TR><TR><TD CLASS="quote">http://www.carbonetic.net/products/lsdoil.html

I thought it would be obvious.

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i saw that but i was worried to put such a thick weighted oil in the tranny since from factory they use thin *** oil.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by OhMyEG &raquo;</TD></TR><TR><TD CLASS="quote">


i saw that but i was worried to put such a thick weighted oil in the tranny since from factory they use thin *** oil. </TD></TR></TABLE>

That is the unfortunate risk that is associated with using clutch pack LSDs. They work best at track operating temperatures which are obviously much higher than anybody would experience on the street.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eric Kangas &raquo;</TD></TR><TR><TD CLASS="quote">
75W-90 gear oil would be roughly equivalent to a 10W-40 engine oil
80W-90 gear oil would be roughly equivalent to a 20W-40 engine oil
80W gear oil would be roughly equivalent to a straight 20 engine oil

http://www.gasgasrider.com/htm....html
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The real **** is running an oil that is not suitable for the bearings inside the transmission and risk damaging the transmission... or, you run an oil that is probably not going to be compatible with LSD causing damage to the LSD.

I know that's a real captain obvious statement there, but since the carbon LSD is relatively new on the market, I'm not surprised of some instances like this one found here:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ZTRACK &raquo;</TD></TR><TR><TD CLASS="quote">
I am now having to rebuild my 3.5 diff. for the third time since installing the ATS Carbon LSD, the first time the installer replaced the side bearing, seals and setup the diff to spec this setup lasted around 4000km before it started howling, I took it back the diff installer and he just shrugged is shoulders saying the mods on the car where causing the problem ie to much torque through the rear wheels (ASP TT approx 400rwhp). So I purchased new bearings, seals, crown wheel and pinion for the full rebuild, I decided to use another diff/gearbox specialist who had built many drag and track cars diff's, after stripping down the pumpkin he said it was full of gunk and sludge which he suggested cause the wear on the bearings and gears he also suggested to replace the crushed washer with and solid bush to prevent pinion end play, which may have been caused by the higher HP of the motor. Anyway to cut a long story short this rebuild lasted 6000km before it started whining and howling, the installer said it's the new fancy carbon LSD causing all the wear and tear from the carbon getting into the bearings and gears acting like a grinding paste, I told him I've been changing the oil very 3000Km as per ATS recommendations, he is at a lost to what is causing the eary failures.

Question to all ATS LSD owners, how many miles since your install, what power are putting through the diff and how is it running ( I mean whining gear/bearing type noises not the LSD popping type sounds, which the ATS is very smooth in its action). Do you think all the carbon gunk created by the LSD to be causing the early failure? I do track the car and really love the way the ATS LSD works in putting the power the road, so do I replace the ATS LSD with a Quaife ATB LSD?

http://www.350z-tech.com/forum...22310
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http://www.350z-tech.com/forum....html

the above info is going to be hard to read as the original poster does not write in English very well. It was originally posted on honda-tech in the ITR forum IIRC. The pictures do speak for themselves.

 

So instead of focusing on finishing my proposal at freaking 4:30am.... Here's something that might benefit those who are considering/currently using an ATS carbon LSD.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ATS-USA from 2006 &raquo;</TD></TR><TR><TD CLASS="quote">

....Carbon disc differs from metal disc by maintaining the very stable friction characteristics not only at the 100% locking, but also at 50 % or 80 % locking position, and by displaying some degree of flexibility in taking a corner R.

Consequently a driver enjoys an exhilarating cornering without worrying about abrupt locking movements. Furthermore, the mild characteristics of carbon LSD help avoiding push under-steer when you accelerate during cornering. Unlike a metal LSD, carbon LSD does not cause "braking phenomenon" - when LSD locks, an increase of the traction deprives the engine torque and slows down the RPM increase - and produces ideal traction.

Carbon LSD also excels in the durability. Even with a decreased initial torque at around 3kg, it produces enough friction which activates the cam ring smoothly. The overhaul cycle of carbon LSD is at least 3 times as long as the metal one, possibly much longer.

Regarding the unwanted chattering noise, with recommended LSD oil, the noise of carbon LSD is so low that a driver hardly notices the existence of the LSD. Street driving and parking maneuver is very easy and fun. The heat produced by the disc friction frequently decreases the performance of metal LSD.

Compared with metal LSD, carbon LSD does not produce as much heat as metal LSD and maintains the superior performance longer and at the same time it increases the life of LSD oil.

However, a regular oil change is recommended especially after a hard driving on a race track. ATS recommends 75W90 LSD oil with less friction additive. Oils with too much friction modifier might cause excessive slippage and might negatively affect the performance. We hope our carbon technology will enhance your enjoyment in motor sport.


http://www.a-t-s-usa.com/new%2...D.htm
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With the above in bold, it might be a fair compromise in transmission and LSD longevity to use this here:
http://www.redlineoil.com/prod...yID=7



<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redlineoil website &raquo;</TD></TR><TR><TD CLASS="quote">
This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.</TD></TR></TABLE>

 

appreciate the info dudes