MX-5 NC with RX-8 231 Engine

Paul_13 · July 27, 2019, 01:09:41 PM

It's either 3.7 or 3.9. They are the other options

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Paul_13 · July 27, 2019, 01:13:08 PM

I'm wondering if the ecu isn't recognising it's a 5 speed box. Flat foot shift no longer works.
There no switch on mazdaedit to change the gear config

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clive · July 27, 2019, 01:26:17 PM

Quote from: Paul_13 on July 27, 2019, 01:09:41 PM
It's either 3.7 or 3.9. They are the other options

There you go Paul, 100% there's your reason as the gears are now spaced much further apart which is why you have the "issue" you think you have,

Either Ratio is way way too high.

I tried a 4.3 in my road RX-8 and I think this is the highest ratio that will work against an NA RX-8 , the diffence from just 4.4 to 4.3 was very very noticeable with 1st gear in particular becoming noticeably longer, also much quieter on motorways in top.

Paul_13 · July 27, 2019, 01:29:09 PM

Ok. There's not a lot I can do to move away from the diff I have then (4.1 ratio)
I'll go back to a 6 speed box.
Solved that one then

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boosted · July 27, 2019, 01:32:52 PM

Supercharger?

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Paul_13 · July 27, 2019, 01:34:37 PM

Honda s2000 diff fits a mx5. Not sure if it fits NA/NB or NC

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Paul_13 · July 27, 2019, 01:34:57 PM

Quote from: boosted on July 27, 2019, 01:32:52 PM
Supercharger?

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Don't.... I've been looking. And turbo

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Jamie R · July 27, 2019, 01:38:56 PM

Quote from: Paul_13 on July 27, 2019, 01:34:57 PM
Quote from: boosted on July 27, 2019, 01:32:52 PM
Supercharger?

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Don't.... I've been looking. And turbo

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Both?

Paul_13 · July 27, 2019, 01:40:33 PM

Any one got a tip for getting the input shaft bearing off? Atkins rotary/mazda sell replacements.
I've take both split rings off. Can't get on the bearing with a puller

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boosted · July 27, 2019, 01:40:59 PM

No and no.....cheaper to put an rew....( rx7 engine ) in and more reliable.

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boosted · July 27, 2019, 01:45:04 PM

Ref bearing i would have thought youd withdraw gear assembly complete out of casing. Then pulloff with std puller.
Weve got some fancy pullers here that go on inside of inner or outer race after digging seal out. Bearing is scrap then but gets em out.

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Paul_13 · July 27, 2019, 01:46:57 PM

Or reverse the whole conversion and put a 2.5 MZR/duratec engine in...

but where is the fun in that.

Seriously though, I have been looking at Rx7 engines but I can't find one. There is a kit now for putting a REW engine in rx8.

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Paul_13 · July 27, 2019, 01:48:29 PM

Quote from: boosted on July 27, 2019, 01:45:04 PM
Ref bearing i would have thought youd withdraw gear assembly complete out of casing. Then pulloff with std puller.
Weve got some fancy pullers here that go on inside of inner or outer race after digging seal out. Bearing is scrap then but gets em out.

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Looking at that shortly. But major ball ache. I've not rebuilt a gearbox before.
In my eyes, the input shaft bearing needs changing and that's an easy way to achieve it by pulling off the bearing as it is now

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boosted · July 27, 2019, 01:49:48 PM

Pah...200hp...souless dull engine..cams throttle bodys ecu 250hp if you lucky...lots of money....
S2000 or k20...k20 my choice.

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boosted · July 27, 2019, 01:51:05 PM

Weld 2 lugs on?
Or another 6 speed plenty about..60quid going rate.

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