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Post by niklas on Jun 7, 2019 14:56:33 GMT
The guys over at miataturbo has measured temps above 170 degees celcius / 340 degrees frankenstein. That's a bit much for, well, everything oily.
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Post by howardb66 on Jun 7, 2019 15:28:50 GMT
Bugger, sorry to see this. Hope you get it fixed soon. Phone call to DaveFab?
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Post by Zed. on Jun 7, 2019 16:11:15 GMT
Going with a Tailgate McNoIndicate transmission would be costly. We'll see, if I can get it to survive with a cooler it would be awesome. I don't really need more power. It'll be interesting to see how you get on - it might be worth looking at some heat shielding between the exhaust and the downpipe / midpipe as I would imagine that contributes a lot to how hot the box gets. I wonder if you can tap the sump plug and put a temp sender in - see how hot it actually gets? heatshielding & a temp-sender are the cheaper options  as to a gear-oil cooler system, should be easy & cheap to build a system but beware of leaks & damage as it would rapidly empty the system with another gearbox being needed  if your car was rhd then modifying the tunnel to shift the exhaust & downpipe away from the gearbox would be a good option as it would allow more airflow between gearbox & exhaust (maybe some ducted airflow from the front of the car to 'cool' the area?) to lower the radiated-heat - not easily done on a Lhd car as theres usually a driver in the way & they don't like having less room to sit & a glowing exhaust melting their shoes & leg  as to a 'Bavarian-Murder-Weapon' gearbox, how about taking it further with the the Getrag 7 speed DCT? www.miataturbo.net/suspension-brakes-drivetrain-49/7speed-getrag-dct-transmission-swap-99647/I'm following this with intrest, looks like the physical fitment is easy (also, note the tunnel modification to move the exhaust) but the electronic's need some thought (although it could be a lot easier as a stand-alone  ) Rich. |
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jon
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Post by jon on Jun 7, 2019 16:18:40 GMT
Shifting the exhaust over requires tunnel modifications though - and with a 3" exhaust there's not a lot of space...
I've been following the DCT swap as well - not sure I'd count it as 'easy physical fitment' as you need to widen the trans tunnel, lift the engine, a trans adaptor plate, clutch replacement plate, PPF replacement etc etc etc... Nice swap though, and some great fab skills...
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Post by niklas on Jun 7, 2019 16:49:59 GMT
zed and jon: there is some guys in sweden fitting dct's to almost everything. If I need to go B M W transmission, then I'll aim for the dct for sure. It ends up about the same cost as the getrag.
But then. If I can make the 6spd stay alive for 1/6th the cost (minimum), then I'll go with that.
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jon
Chats A Lot
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Post by jon on Jun 7, 2019 17:11:13 GMT
Yeah - I've been waiting to see how it works out in practice, a DCT '5 would be pretty cool Since swapping from a 5 speed to a 6 speed, it's apparent the 5 speed is a much nicer box  |
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Post by niklas on Jun 7, 2019 17:27:09 GMT
 And thats all I did š but eventually I'll be able to sneak out and work on the car. |
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Post by niklas on Jun 7, 2019 17:27:58 GMT
And thats all I did š but eventually I'll be able to sneak out and work on the car. I do appreciate that it takes 5 minutes to raise the car now. Edit: wrong button. Wasn't supposed to quote myself š |
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Post by niklas on Jun 11, 2019 20:45:32 GMT
Collected my spare box. Found some industrial oil pumps.
Probably need to shop for a sintered clutch disc and some fanned coolers.
Anyone have experience with a sintered dicc in a FM pressure plate? I have a stage one, it slipped with hot abuse. I would need something that can handle about 500nm. the fm stage one will handle 430. I have a slight bit more. A sintered disc might just get me what I need, as long as I haven't killed the pressure plate and flywheel.
I need to find time to tear everything down.
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Post by niklas on Jun 12, 2019 15:28:03 GMT
Took the box down. With the crap engineering subframe I can remove the downpipe without removing the turbo and manifold, even though it is ewg. That is very nice. An all too familiar sight.  Clutch plate and flywheel seemed ok. As did the clutch disc. This leaves me with the question if I keep everything as is, or if I put in a sintered 6-plate disc. The latter will handle heat better, something the current organic one didn't   The transmission oil looked funky. And contained bits of metal.  Without knowing what I'm doing I started to strip down the old transmission. 6th looks fine anyway š but the oil is gray.  Now, getting the new box on there is easy. To design a cooling system for it takes a little more work. I have a track day booked the 28th, but I think I may have to forfeit that |
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Post by V6 on Jun 13, 2019 19:42:56 GMT
My tech has a 330bhp turbo and is on his 5th or 6th gearbox now. I may have to pick up a spare gearbox before you turbo guys trash the lot of them.
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Post by V6 on Jun 13, 2019 19:52:24 GMT
Yeah - I've been waiting to see how it works out in practice, a DCT '5 would be pretty cool Since swapping from a 5 speed to a 6 speed, it's apparent the 5 speed is a much nicer box
I've heard this comment a LOT. One of the reasons i really want to keep mine. Even if it means being sensible and sticking close to 300bhp to be safe.
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jon
Chats A Lot
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Post by jon on Jun 14, 2019 6:10:45 GMT
I've heard this comment a LOT. One of the reasons i really want to keep mine. Even if it means being sensible and sticking close to 300bhp to be safe.
My 5 speed survived at circa 280 FWHP for a fair few years - I'm not sure how turbo torque compares to your V6, but there's a chance you could be perfectly fine with one... The 6 speed is notchy in comparison, crunchy when cold and I'm not keen on the gate spacing - I very rarely missed shifts, if at all on the 5 speed and I've missed a few on the 6. There's also something funky with 4th to 5th if you shift in a hurry - I think you overcome the reverse detente then something jams up and you get locked out of most of the gears. Cue frantic waggling, de-cluctching and eventually it will engage another gear, usually 4th and be OK. I have read that there's a selector fork that can be adjusted in the box (or that bends) which can cause shifting issues. It doesn't do it very often, usually when I'm trying to shift quickly. I've swapped to stiffer engine mounts (Supermiata Hybrid), put the v8 roadsters shifter bushings in, and it's running the recommended Castrol oil, so not sure what else to try other than pulling it out and apart. |
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Post by niklas on Jun 14, 2019 17:07:48 GMT
Yep 5spd>6spd when it comes to being a nice gearbox. But then again. A 5spd would last something like out of the driveway in my car..
I hope cooling will make the 6spd last
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Post by V6 on Jun 14, 2019 17:46:16 GMT
Did Dave Fab sell any of their gearbox coolers? I'm sure they are great but they seemed incredibly expensive to me.
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)
le sigh
Jul 15, 2023 20:03:52 GMT