Author Topic: All great things have a beginning  (Read 12040 times)

Offline Paul_13

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Re: All great things have a beginning
« Reply #450 on: July 13, 2020, 06:26:46 PM »
Rx8 and mx5 diffs are different size unfortunately. Rx7 and rx8 are same.

I have a 4.1 diff in mine and it suits the NA engine nicely.
For your car you'll want 3.9.i think they did a 3.7? I've got a couple of spare diffs here. I'll check the ratios of them.

That arm is definitely bent.

Rear ARB's are puny. Rx8 items are a straight swap.

If it's a 2.0 liter you've got, it will most likely be a LSD

Offline Grant Monkhouse

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Re: All great things have a beginning
« Reply #451 on: July 13, 2020, 08:31:38 PM »
It's a 1.8, from what info we can find, if it's got a leather interior 5 speed and 1.8 it has anLSD but probably beyyer to swap out for whole rx8 rear end?

I can restore it and do bushings and the do a straight swap then can't i

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Offline Grant Monkhouse

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Re: All great things have a beginning
« Reply #452 on: July 13, 2020, 08:33:19 PM »
Mx5 half shafts are weird to me, they thin on the ends and fat in the middle

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Offline Paul_13

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Re: All great things have a beginning
« Reply #453 on: July 13, 2020, 08:33:31 PM »
The rear subframes don't swap straight over. The studs on the mx5 chassis aren't long enough.

I can't see why the rx8 diff won't swap in. The diff hanger bracket is the same on the mx5.

Offline Grant Monkhouse

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Re: All great things have a beginning
« Reply #454 on: July 13, 2020, 09:20:21 PM »
The rear subframes don't swap straight over. The studs on the mx5 chassis aren't long enough.

I can't see why the rx8 diff won't swap in. The diff hanger bracket is the same on the mx5.
Glad you've pointed that out! I was looking at buying the complete rear end from an rx8

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Offline Grant Monkhouse

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Re: All great things have a beginning
« Reply #455 on: July 14, 2020, 05:43:08 PM »
From the sparse info I'm finding online, the diff goes in but the ppf doesn't fit, which isnt an issue because the mx5 ppf won't fit anyway due to using the fd gear box.

Going to be making my own and/or tying the gear box and the diff to the chassis and roll cage

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Offline Paul_13

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Re: All great things have a beginning
« Reply #456 on: July 14, 2020, 08:14:08 PM »
Yes the PPF won't fit but as you're going custom /modified it doesn't matter

Offline Grant Monkhouse

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Re: All great things have a beginning
« Reply #457 on: July 14, 2020, 10:22:29 PM »
Yes the PPF won't fit but as you're going custom /modified it doesn't matter
What ratios diff have you got lying around then? Iv been looking for info online as to ratios but everyone says different lol

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Offline Paul_13

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Re: All great things have a beginning
« Reply #458 on: July 14, 2020, 10:28:05 PM »
I think it's a 3.9 diff. I haven't counted the teeth on the diff crown wheel.

Offline Grant Monkhouse

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Re: All great things have a beginning
« Reply #459 on: July 14, 2020, 11:19:51 PM »
I think it's a 3.9 diff. I haven't counted the teeth on the diff crown wheel.
I take it all the rx8s are LSD?

The 8s are an 8" compared to the 7" of the mx5.

Should be more hopeful for holding the 5-600hp I'm hoping for

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Offline Casey

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Re: All great things have a beginning
« Reply #460 on: July 15, 2020, 09:33:30 AM »
I take it all the rx8s are LSD?

That's correct Grant. Different ratios on S1 and R3  but physically interchangeable.
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Offline Grant Monkhouse

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Re: All great things have a beginning
« Reply #461 on: July 15, 2020, 01:18:04 PM »
I take it all the rx8s are LSD?

That's correct Grant. Different ratios on S1 and R3  but physically interchangeable.
Thanks. I take it the R3 was the 4.44 or did it have a 4.7?

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Offline Grant Monkhouse

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Re: All great things have a beginning
« Reply #462 on: July 15, 2020, 02:56:06 PM »
Intake pipes and flanges dropped off to be welded

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Offline Mr Spiller

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Re: All great things have a beginning
« Reply #463 on: July 15, 2020, 03:39:36 PM »
I take it all the rx8s are LSD?

That's correct Grant. Different ratios on S1 and R3  but physically interchangeable.
Thanks. I take it the R3 was the 4.44 or did it have a 4.7?

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R3 was 4.7


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Offline Grant Monkhouse

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Re: All great things have a beginning
« Reply #464 on: July 16, 2020, 01:50:53 PM »
Just realised the fuel tank has gone, there's now easy access to the diff and subframe from inside the car.

Something I remember reading years ago, think it might have been a feature on the dragon performance CamO time attack car that they tied the diff mount into the roll cage, and also the gear box so there was no need for a PPF.

Looks like something I will be able to achieve quite easily now with all that room for activities under the car

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