Diyman25

With S2 Transmission, that really speed up my Final drive upgrade time period

Decide to upgrade to 5.3 final drive
With very careful simulation on Sofeware

Along with it updated Lsd from Rx7 torsen to cusco RS lsd, with low intial TQ i should not loose too much speed at corner entery

Also on list is Jdm garage Revolution high capacity diff cover, with extra Liter of oil should keep Temperature down and reliability of LSD locking at limit

TeamRX8

iTrader: (25)

if that’s the JDM S2 then at least it has a better 3rd gear ratio than we get here in the US. If you ever need 6th gear though, I’m not sure the lower rear gear will help enough to overcome the gap of how much steeper the S2 0.787 ratio is from 1.000 in 5th. That’s a big gap to jump at that speed with the NA Renesis power level. I suppose it just depends on the track.

Would love to have that cover, but hard to justify the cost for what I do.

Diyman25

With two of only Track at Taiwan max speed
Is about 165km for Rx8, which roughly around
4th 8500 Rpm , so I think I don't ever need 6th

Yeah that is pretty rare item , and special design. For Rx8 with Offset exhaust in mind
Hope I can get away with high capacity diff cover without trouble of Diff pump and cooler

dannobre

iTrader: (3)

Extra fluid doesn't increase cooling capacity that much. Will likely need cooler if you push it hard. Although that LSD should run cooler than some

Diyman25

Hope all thing help , extra fluids, heat dissipation coat and low Intial TQ one way LSD

I only need 2-3 lap~
Since I don't to do Full on W2W on my Rx8

dannobre

iTrader: (3)

2-3 laps will be no problem 😀

DocWalt

I'm glad to see that diff cover has a fluid ramp in it so the windage around the ring gear goes where it should.

Diyman25

Good eye

Without it all the oil will be splash around all over the place

mrbarry76

I just modded the FD one

Diyman25

Nice
Do u put the oil splash plate inside ?

mrbarry76

Of course

Diyman25

Been using variety of aftermarket LSD for long time
kazz, ATS , OS giken , and very aware of LSD need special friction modifier oil in order eliminates the chattering noise

This Cusco RS LSD , was developing very bad Chattering noise, i change two completely diff brand of LSD and different grade did not improve at all, at last a friend who has tons experience on Cusco told me Cusco RS only work with their Cusco 80/90 oil
Finally solve my problem, learn something new today , and save my weekend from disaster because i am scheduling to track testing

Diyman25

Without cooler ,u can run about 2-3 lap
Within safe range, if push over whole session for 7-8 lap the temperature will spik to 170c and oil will expand from vent tube, create a mass

Next track test will be 10/17, will build a overflow tank for diff

Diyman25

some video of testing of 5.3 after bleed off exceiss diff oil , the rhyterm of 5.3 is not there yet , so i need more seat time then i think but with 4km faster on staight way
i think i will get it dial down , Cusco RS still lock too aggressively at slow turn

trackjunkie

350F is a bit hot

Diyman25

Found this extra latge Cpu processer cooling fin at local store
Decide to give it a try gor Differential cooling fin

To give it max cooling capacity bought the some high temp thermal heat paste
So fin have no air package between diff cover and fin

trackjunkie

lol ninja rigged. hope that doesnt fly off on track and go through someone's windshield. should get someone to weld it to the diff cover.

Diyman25

Yeah ... that's why switched to 80-250 oil
And add cooling fin this time

Muti angle safety wire it too , if this work
Will weld it on to diff or bolt it to diff cover

trackjunkie

Did you heat wrap the exhaust near the diff?

Diyman25

Doing it this time , last time when I install 5.3 run out of supply of exhaust wrap

TeamRX8

iTrader: (25)

wth ...

you should quit playing silly games and install a proper pump and oil cooler just like everyone before you has found out and stated for the last 15 years.
.

Diyman25

U should think outside of box some times

http://odula.blog85.fc2.com/blog-entry-1911.html

TeamRX8

iTrader: (25)

I can think out of the box, but don’t see that dropping 150* off the oil temp while running such a low rear gear

trackjunkie

i have thought about that i dont think that's enough to drop 100F temp.

you dont want to destroy your new expensive cusco lsd and 5.3 FD. i spent like $300 for my diff cooler setup.

DocWalt

That's an ND diff though which is *crazy* low gearing compared to your 5.3 rear end. ND diff doesn't make all that much heat even without much attempt at cooling. Look at the lack of fins from the factory.