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So I ordered that Revolution Extra Capacity Rear Differential Cover from RHD Japan.
I think something must be wrong with their site as there price on this part is currently like $14 at current exchange rates. I went ahead and ordered it... we'll see what happens.
As I mentioned, I used a S2 diff cover. I think it took a bit more oil than the S1 but it could very well be placebo effect. The S2 cover does have more cooling fins than the S1.
Hell of a deal considering it lists for $290 in Japan, probably should have kept that under your hat because if they suddenly get a dozen orders somebody will wonder wtf is going on
I just got my diff oil analysis back. 2 yrs, 19 track days and 26500 miles on Amsoil 75W/90 severe gear oil in a 2010 (S2). I was pleasantly surprised as wear appears to be completely normal!
Going to send my gearbox oil in next. I'm not expecting that to look so good as it was more grey than black after the same amount of abuse.
hm interesting note about the heat, so good syn diff oil will handle S2 diff heat just fine even with heavy track use..good to know!
I just flushed my S2 diff, car(new to me) only has 28K of probably gentle street driving. I put in 50/50 mix of Redline lightweight shockproof and their 75w-90 gear oil.
As I mentioned, I used a S2 diff cover. I think it took a bit more oil than the S1 but it could very well be placebo effect. The S2 cover does have more cooling fins than the S1.
I don't know about a capacity change in putting an S2 cover on an S1 diff, but I can tell you that my S2 diff holds almost exactly 1.5 quarts.
My strategy for my diff and trans is to use Redline 75W90 and MT90, respectively, and change them once per year. Both looked good last June after a year and 11 track days. I will probably send them to Blackstone this June for analysis out of curiosity.
The owners manual lists both s1 and s2 differential oil capacity as 1.4 quarts. I used closer to 2 quarts both times I changed my s2 diff oil though. Some wastage, but still seems like more than 1.4 quarts went in with the car level.
Rx8performanc.com has a cooling device in the front under panel that you can buy. They claim it can be used for many things like a transmission cooler or a differential cooler. I hope this info is beneficial to somebody. Me not having my 2nd 8 yet, I have research nearly every performance website there is to find. I wonder if anyone else is a rx-8 junkie like me. :/
Is this something I need to be concerned about when running a mostly stock vehicle on HPDEs?
Without installing a diff temp gauge, is there a way to figure out at what point this is something I need to be concerned about? I've done many HPDEs on my 8, but haven't even thought about my diff temps... realistically, I just take the car out and go - so long as nothing pops up on the dashboard, I figure I'm ok, haha.
I agree with Dan. You'll be fine at stock power, but it is prudent to change the diff oil yearly with high quality synthetic gear oil. I use and like Redline 75W90 as noted above. I actually just changed it last weekend after 14 track days, and it looked very good. I forgot to take a sample, so there will be no UOA report this year.
Yep, see my UOA in post #31 Diff seems to hold up well (on an s2 at least). Gearbox is another story. There was a lot of metal in my transmission fluid after the same duration.
^^which is why it's not a good idea to angle your exhaust over towards it, some people still don't get it
synthetic fluid only goes so far, have a 3rd gear synchro pic on here somewhere from the past with what looks like burn-on all over the surface and it had cracked & broken, all that went away when I changed the piping to stay away and then bend it over at the end of the tunnel
Has anyone done any write up on a differential cooler install? It's time for me to do it. Would just be nice if someone else has done the homework on fitting sizes/thread that kind of thing.
03-20-2015, 03:16 PM
