What have you done to your RX-8 today????

[kopite72]

great work Loving that lift aswell,very impressive

[warpc0il]

Looks like you had a good day for it.
It was baltic here, with blizzards.

[Neilparry]

Good days work today Ben Envious if that lift lol.
How does that cage fit with the seats in place??
Ed fitted his with bearly 10 mm to the back of his seat.


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[Phil Bate]

Just fyi, you can fill the 6sp from the shifter tower

[mrspiller]

Just fyi, you can fill the 6sp from the shifter tower

I never knew that ...... I always stick a hose pipe from the engine bay


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[untakenname]

Did some mocking up of a sub box, think I can just about squeeze it all into the back part of the boot leaving most the rest free for luggage.

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[TerryH]

Just fyi, you can fill the 6sp from the shifter tower

Phil,

Can you expand on this a little please,

Do you mean remove the gear stick and litraly fill through that opening?

Do you leave the fill plug out so you can guage when at correct level?

If so this has to be one of the best tips

If not I'm confused and glad I asked before trying it

Cheers

Terry

[Eddie_r32]

Just fyi, you can fill the 6sp from the shifter tower

Phil,

Can you expand on this a little please,

Do you mean remove the gear stick and litraly fill through that opening?

Do you leave the fill plug out so you can guage when at correct level?

If so this has to be one of the best tips

If not I'm confused and glad I asked before trying it

Cheers

Terry

Oil syringe FTW, not expensive and keeps the smell of tran fluid out the car.

[johnbb99]

FTW?

[untakenname]

For the Win.
I think I'm going to attempt to overfill my gearbox as I'm getting the 3rd to 4th grind at high revs and according to the issue on the rx8club.com forum it can be helped by overfilling the gearbox.

[ChrisHolmes]

I have the same issue and have just changer the oil to Red Line MT90 as that is a straight GL4 oil. Apparently GL4 / GL5 blends are too slippery for the synchro cones in the RX8 gearbox.
Snetterton next Monday will be the big test to see if it has worked. Assuming my motor lasts that long!

[untakenname]

MT50? I use Redline MT-90 in mine (have changed it twice in short succession) and it grinds badly above 7k when changing into 4th, I'm not sure what it was like with the stock fluid as I didn't drive the car hard before changing to redline, doubly annoying as I chose to keep the gearbox in the Kuro when swapping the engine from my old car as it had 20k less on it than my old 04 RX8 and no swarf was on the magnetic drain plug.

These posts on the rx8club.com forum give me hope that it can still be resolved without an expensive gearbox swap.

My car did the same exact thing when I went from stock oil to MT90 this summer. MT90 made it grind only in 4th past 6k RPM and when I tried to remedy it thinking I need to go heavier to 75w-140 lightweight shock proof, it got worst. Grinding then was persistent past 6k rpm in both 3rd and 4th. I went with MTL (70w-80) and the problem went away. This was checked multiple times on the highway screaming it up to 8~9k shifting without a single grind. This told me it was NOT the transmission but was the oil that caused the problem. Unless there is some rare coincidental timing of your transmission wanting to crap on you when you switch to a different oil, if the new oil creates a grind get something else to work. I switched out the trans. oil thrice within a month until I found the right oil to work with it.

Try going to a lighter weight oil such as 75w-85 GL4 (not GL5) or MTL (70w-80) as I did, or perhaps even better yet, stock oil. 75w-85 GL4 wasn't a selection I recall being available during the summer when I was looking online all over for that grade before going lower to MTL.

And a couple like this about overfilling the tranny

I had this same problem then I changed my fluids to a synthetic 75W90 gear oil and still had it. Then I put some extra fluid to top it off some more through the gear box by taking out my stick shifter out and pouring it through the hole and voila! No more grinding in fourth gear!

[mrspiller]

I’ll be watching this gear oil chat with interest as mine started crunching after I changed to the MT90


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[Dazza44]

Mine was crunching a little then I did a double change with motul mt90 and solved the problem(about 6 months since)

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[ChrisHolmes]

MT50? I use Redline MT-90 in mine (have changed it twice in short succession) and it grinds badly above 7k when changing into 4th, I'm not sure what it was like with the stock fluid as I didn't drive the car hard before changing to redline, doubly annoying as I chose to keep the gearbox in the Kuro when swapping the engine from my old car as it had 20k less on it than my old 04 RX8 and no swarf was on the magnetic drain plug.

These posts on the rx8club.com forum give me hope that it can still be resolved without an expensive gearbox swap.

My car did the same exact thing when I went from stock oil to MT90 this summer. MT90 made it grind only in 4th past 6k RPM and when I tried to remedy it thinking I need to go heavier to 75w-140 lightweight shock proof, it got worst. Grinding then was persistent past 6k rpm in both 3rd and 4th. I went with MTL (70w-80) and the problem went away. This was checked multiple times on the highway screaming it up to 8~9k shifting without a single grind. This told me it was NOT the transmission but was the oil that caused the problem. Unless there is some rare coincidental timing of your transmission wanting to crap on you when you switch to a different oil, if the new oil creates a grind get something else to work. I switched out the trans. oil thrice within a month until I found the right oil to work with it.

Try going to a lighter weight oil such as 75w-85 GL4 (not GL5) or MTL (70w-80) as I did, or perhaps even better yet, stock oil. 75w-85 GL4 wasn't a selection I recall being available during the summer when I was looking online all over for that grade before going lower to MTL.

And a couple like this about overfilling the tranny

I had this same problem then I changed my fluids to a synthetic 75W90 gear oil and still had it. Then I put some extra fluid to top it off some more through the gear box by taking out my stick shifter out and pouring it through the hole and voila! No more grinding in fourth gear!

Whoops! Typo its Redline MT90 of course

[PeteH]

This could turn into another oil thread if we are not careful, but my tupence is.... I only noticed 4th gear grinding when I switched to MT90. It eventually resulted in a gearbox change. I now use Comma EP75W90 GL4 synthetic. It's not foolproof (but I change at nearly 10k rpm, so I doubt anything is foolproof), but it definitely seems better than MT90 to me. And it's less than half the price. And you can get it from Halfords. This club started to recommend MT90 after some bad experiences with GL5 (I believe), but I really think sticking to the MT90 recommendation is not a good policy. If we keep recommending it we might run out of RX-8 4th gear synchros......

[mrspiller]

This could turn into another oil thread if we are not careful, but my tupence is.... I only noticed 4th gear grinding when I switched to MT90. It eventually resulted in a gearbox change. I now use Comma EP75W90 GL4 synthetic. It's not foolproof (but I change at nearly 10k rpm, so I doubt anything is foolproof), but it definitely seems better than MT90 to me. And it's less than half the price. And you can get it from Halfords. This club started to recommend MT90 after some bad experiences with GL5 (I believe), but I really think sticking to the MT90 recommendation is not a good policy. If we keep recommending it we might run out of RX-8 4th gear synchros......

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[Dazza44]

This could turn into another oil thread if we are not careful,




,



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[Dazza44]

Back on topics,dropped car off this morning to have aero kit fitted hoping get it back Wednesday

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[Dr. FrankenRex]

Ordered myself a Varta E23, new R3 ECU set with keys, spare coil set lovingly loaned from Nick and a new fuse box... Wish me luck on fixing this ballsup lads...

[PaulAV]

Good luck Dr frankenrex

[nightfire10]

Thanks

A note to everyone here: BE VERY CAREFUL WHEN JUMP STARTING... DON'T GET THE TERMINALS THE WRONG WAY AROUND...

[TerryH]

Just fyi, you can fill the 6sp from the shifter tower

Phil,

Can you expand on this a little please...

It's exactly as it sounds Terry - remove the shifter and pour it in! It does mean removing the centre console though, so unless you are doing this anyway or your car is light on interior trim like Ben's then it's probably easier to run a hose down from the engine bay with a funnel in the top. You will still need to remove the top plug to allow it to drain to the correct level.


And just to be clear - DO NOT FILL A 5SP FROM THE SHIFTER TOWER!!!

[PaulAV]

Removed passenger side rear light cluster (personal swimming pool edition)emptied it out, flushed it out and dried it, cleaned up the body work where it mounts and used some storm guard weather strip (was only a couple of pounds from B&Q) to fashion a new seal, fingers crossed I may have lost a swimming pool but gained a dry light cluster

[warpc0il]

This could turn into another oil thread if we are not careful, but my tupence is.... I only noticed 4th gear grinding when I switched to MT90. It eventually resulted in a gearbox change. I now use Comma EP75W90 GL4 synthetic. It's not foolproof (but I change at nearly 10k rpm, so I doubt anything is foolproof), but it definitely seems better than MT90 to me. And it's less than half the price. And you can get it from Halfords. This club started to recommend MT90 after some bad experiences with GL5 (I believe), but I really think sticking to the MT90 recommendation is not a good policy. If we keep recommending it we might run out of RX-8 4th gear synchros......

I was happy to recommend Redline MT-90, after the massive improvement to the change action and noise when I refilled with MT-90, less than a month after the dealer filled the 'box with god-knows-what. The previous action was so hard and nasty that I couldn't understand why anyone would want a short-shifter, as I needed all the leverage I could get. However, with MT-90 the change was nice and slick and remained so, even when I fitted the short-shifter that I'd been bought for Christmas.

That was nearly 10 years ago and my 'box is still running on that same fill, 27k miles and many track days later . Doesn't time fly when you're having fun.

I've also seen the internal damage to other peoples 'boxes caused by Fuch GL4/5 on both the 3rd and 4th gear synchros, and was party to the on-site analysis that concluded that the damage was due to the oil being "too slippery" for the synchros to correctly engage.

The issue from the Fuch GL4/5 was most apparent on-track but also while attempting any fast changes on road, and started within less than a hundred miles of the fill. At least six members cars were impacted.

However, I can also confirm that a well-overdue fill of MT-90 doesn't prevent 4th gear synchro issues, as mine refused to give me 4th cleanly @ 9krpm (for the first time ever) after the 8th lap of Kirkistown this year. On the second session the problem was apparent from lap 5, and by the last session it was starting on lap 2. See in-car footage of later laps - camera didn't work for earlier laps.


Driving on the road since it hasn't been possible to replicate the problem, as you need to be accelerating hard beyond 95 mph (9krpm in 3rd) consistently. I've also not had any issues with 3rd, on track or on the road.

As well as my 'box being well overdue an oil change, my car is one of the early models known to have an issue with internal leakage passed the piston seal of the clutch slave cylinder, which can cause difficulties engaging gears when the transmission is hot. I have had this problem a couple of times when caught in hours of stop-start traffic on the M25 in summer. I bought a replacement (Pagid) slave cylinder and a nice stainless braided hose 3 years ago but a house move, life and health issues mean that they're still in my to-do box, along with clean brake/clutch fluid.

I've since bought enough MT-90 to do a double change, making sure all the worn-out stuff is removed, and I'm hoping that, along with the replacement clutch slave cylinder, that the issue will be resolved. I say "hoping" as I'm not convinced that it will be enough and I've already got agreement from the guy that manages Kirkistown that I can go round for a few test laps to see if it's fixed after.

The alternative is to replace the 'box but, as I've also said in PM discussions with a few members, the problem isn't apparent at all on the road. This means that any other 'box could also be supplied, in good faith, as not having a problem, only to find that it's just as bad, if not worse, under track conditions. After all, if I wasn't driving mine on track I'd say my 'box was fine too.

So, is MT-90 the cause of the problem? The evidence says not, otherwise it would have occurred, at least on track, many years ago.
The clutch slave cylinder may be a factor but, while the others changes were a bit notchy when really hot, it was only 4th that had the real issue.

I blame myself for leaving it so long before giving the gearbox oil a refresh. When life happens it's easy to think "I only did that a couple of years ago" and let things slide. It was only when I checked my records that I discovered that the battery that I've been criticising for not holding 100% charge is coming up to 7 years old - so it's not really that much of a surprise.