johnc Posted April 20, 2006 Share Posted April 20, 2006 I am very concerned about heat damage over time.... I do not expect to work on this rear end every season.. I would like it to last at least 8-10 seasons of abuse.... that is roughly 80-100 events... More power to you, I hope you get those results! With around 200 hp most of the ITS guys I know rebuilt their clutch pack LSDs at least every 2 years and the couple GT2 guys I knew who were running coolers and heat exchangers rebuilt their diffs on about the same schedule. Quote Link to comment Share on other sites More sharing options...
bjhines Posted April 20, 2006 Author Share Posted April 20, 2006 I am seriously looking into safety wiring the ring gear bolts..... I just don't trust locktight... I have not been able to purchase the original locking compound that Nissan used... Drilling the hole was realatively easy.... The housing material is soft... it drills and taps as easily as aluminum...actually it taps MUCH BETTER than aluminum... it cuts cleanly without gouging... and it does not clog the tap... I used 6 little rare earth magnets on both sides while I was drilling... they caught EVERYTHING...I drilled the hole upside down and nose high for insurance.... I wrapped the pinion in a plastic baggie... but the magnets really did catch every bit of metal... The carrier just pops out once you remove the cap bolts... I did have to use a plastic mallet to knock it out into a plastic bin on a wood floor... that sucker is heavy and you would not want it to hit concrete.... But it is really not that bad to remove differential carriers.. the R180 style or the R200 style... I prefer to work on the R180s... they really do come apart easily... Quote Link to comment Share on other sites More sharing options...
bjhines Posted June 27, 2012 Author Share Posted June 27, 2012 I got some results back from the track on heat in the LOM-59 CLSD in my R200 3.54 rear end. I was really able to push it hard and the temps just keep climbing the whole time I am out there. It get's to 300f in about 6- 7 laps. It is pegging the gauge(>340f) after 10-12 hard laps. That is 20-30 minutes of hard driving, depending on the track. I am definitely going to add the pump for the cooler and get some new test results next outing. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted June 27, 2012 Share Posted June 27, 2012 I'm having trouble with a little oil coming out of my stock diff vent. If it continues (I could be a little over filled) i plan to add a little hose to it and remote the vent a little so the oil doesn't run all over my new,pretty diff. Anything wrong with that plan? I think this is on subject so please gently correct me if I'm thread jacking. Quote Link to comment Share on other sites More sharing options...
bjhines Posted June 28, 2012 Author Share Posted June 28, 2012 I have run into that problem on track often. The mushroom vents will melt down eventually, I pull the plastic vent-remains and tap the hole for NPT threads. install a hose nipple and run the hose up to a metal fuel filter with the open end up. It is a catch can that drains back. I just zip tied it to the brake line to keep it up high. Quote Link to comment Share on other sites More sharing options...
RACERZ Posted June 28, 2012 Share Posted June 28, 2012 We ran a line off our EP car to a remote vent and it still overflowed some. you best bet is a vented catch/expansion tank (we will be adding one for next year). As far as running a oil cooler/pump I would call Greg Ira, he had issues with his power bruit lsds on his EP car and added a pump setup. He is a super nice guy and will be able to give you the optimum setup. He has a web page that has his number give him a call. Another source is Sam Neave at LNA enterprises he does a lot of race setups on NISSANS. Quote Link to comment Share on other sites More sharing options...
Nelsonian Posted June 29, 2012 Share Posted June 29, 2012 I have run into that problem on track often. The mushroom vents will melt down eventually, I pull the plastic vent-remains and tap the hole for NPT threads. install a hose nipple and run the hose up to a metal fuel filter with the open end up. It is a catch can that drains back. I just zip tied it to the brake line to keep it up high. Got any pics of this set up? Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted June 29, 2012 Share Posted June 29, 2012 Aaaaaargh! I need another project like a hole in the head. I think I'm gonna use a rag for a while. I also figure id have to pull the cover so the tapping waste doesn't go into the diff. I'm off the thread so you fellas can continue. Quote Link to comment Share on other sites More sharing options...
24OZ Posted June 29, 2012 Share Posted June 29, 2012 (edited) The finned R200 diffs came with a metal vent, maybe see if Nissan stocks the metal vents if melting is an issue. Edited June 29, 2012 by 24OZ Quote Link to comment Share on other sites More sharing options...
bjhines Posted June 29, 2012 Author Share Posted June 29, 2012 I found some pics This is the LOM-59 12 disk, 2 way, low ramp angle, low breakaway/pre-load, with a forged cross. Here is the prepped rear cover with NPT barbed vent, temp sender, and tapped drain connector. Here is a shot under the car showing the filter, hoses, and the vent can as high as it will go, with a road draft tube coming back down. ... Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted June 29, 2012 Share Posted June 29, 2012 Sweet!!! Have you posted this on the IT forums? They need to liven up the technical postings there. Quote Link to comment Share on other sites More sharing options...
Bob_H Posted June 30, 2012 Share Posted June 30, 2012 Something to consider- in the FD RX7's, they have a big problem with the diffs overheating ESP with a swapped 8.8 diff. tests have been run when running the ford 8.8 diff,(what I had in mine). Tests of temps in both the FD and the Ford Cobra showed the exhaust really put some heat in the diff. Wrapping the exhaust pipes near the diff kept the temps from continually rising ESP in the cobras the had two pipes under the diff like you have. Their assessment was the exhaust pipes were the source of much of the heat. In mine, it stopped the "puking" out the top vent. Food for thought. Bobby Quote Link to comment Share on other sites More sharing options...
johnc Posted June 30, 2012 Share Posted June 30, 2012 Sweet!!! Have you posted this on the IT forums? They need to liven up the technical postings there. Diff coolers are not legal in IT. That's why we cooked the fluid in our R180s all the time. You also learn how to swap a hot diff between practice and qualifying, by yourself, in less then 35 minutes. Quote Link to comment Share on other sites More sharing options...
bjhines Posted June 30, 2012 Author Share Posted June 30, 2012 (edited) I will have to consider the exhaust issue. It is unlikely the exhaust tubing can transfer enough heat to cook the differential, but... exhaust heat could interfere with the ability for the differential to dissipate heat as it builds up. It takes a full hard session to peg the diff temp gauge. That is ~ 20 minutes to get to 350f. It takes 20-30 minutes for the diff to cool back down(<150f.) between runs. That is not too bad considering I run it in time trials and practice sessions. The engine oil and water temps reach a peak in ~6-8 minutes of hard laps. [[oil=240f. water=210f.]]. Engine temps cool down quickly when I take it easy on the cool-down lap [[oil=180f water=180f]]. The diff temp just keeps rising. I would have stopped if it pegged the gauge earlier, but it takes a full session to get that hot. Edited June 30, 2012 by bjhines Quote Link to comment Share on other sites More sharing options...
Tony D Posted June 30, 2012 Share Posted June 30, 2012 You don't need track sessions to melt the plastic cover vent on an R180 for sure! I melted mine off towing a small trailer to Phoenix one summer. Went synthetic oil afterwards. The R200 is marginally better, but they still get hot. For someone driving the desert southwest at highway speeds...stick a VW Head Temp Gauge (thermocouple) on the cover and prepared to be amazed they last as long as they do! Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted July 5, 2012 Share Posted July 5, 2012 Diff coolers are not legal in IT. That's why we cooked the fluid in our R180s all the time. You also learn how to swap a hot diff between practice and qualifying, by yourself, in less then 35 minutes. I thought they were legal in ITE and PRO/IT Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted July 8, 2012 Share Posted July 8, 2012 I just saw a photo of a Q45 diff. They have a hose coming off what looks like the diff vent location. Anybody know anything about that diff and if the parts can be exchanged? Quote Link to comment Share on other sites More sharing options...
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