All great things have a beginning

Grant Monkhouse · July 09, 2020, 08:25:23 PM

Just for reference this is an anti roll bar on a supra that runs 6s, stick shift Independent Rear Suspension, runs straight as an arrow

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Grant Monkhouse · July 09, 2020, 08:35:35 PM

Quote from: clive on July 09, 2020, 08:23:06 PM
Grant, real puzzled by the post because when going in a straght line the anti roll bar does nothing, it just goes up n down with the suspension

When the car squats with IRS they don't just go up and down, the tyres, plus the car will "torque" to one side pushing one tyre in harder which will steer the car.

There's an rx7 Len Bacon I believe owns it and his car literally drifts down the race track running 7s because of the IRS.

Cars without beefy ARBs tend to lift one of the front wheels when they launch, going up isn't going forward which means you aren't going quick as you could be

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Grant Monkhouse · July 09, 2020, 09:23:28 PM

https://youtu.be/k_8s2XuLmlY

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re japi · July 10, 2020, 08:51:53 AM

IRS isnt best option for going on straight line if having massive amount of power. However, it can do the job if its good. FDs for example is good, even tho it hasnt got much in travel in suspension

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Grant Monkhouse · July 10, 2020, 11:12:45 AM

Quote from: re japi on July 10, 2020, 08:51:53 AM
IRS isnt best option for going on straight line if having massive amount of power. However, it can do the job if its good. FDs for example is good, even tho it hasnt got much in travel in suspension

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Yep, solid axle and an auto gear makes a better consistent car but unless your piloting 3000hp it prety boring

IRS and manual gear box means more fun and more things to learn about, clutch setup, suspension. We choose rotaries to be different, if I wanted to make things easy I would go v8 and a powerglide

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Grant Monkhouse · July 13, 2020, 01:26:01 PM

Glorious gaping hole space created today, along with some fat loss

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Grant Monkhouse · July 13, 2020, 01:26:53 PM

Carbon cannister held in with 2 screws, came off nice and easy

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Grant Monkhouse · July 13, 2020, 01:31:29 PM

1 x fuel tank out.

Internet said requires dropping of subframe.... Internet was wrong.

Unclipped hand brake cables, disconnected from hand brake.

Removed 4 x screws hold tank in.

Removed carbon cannister.

Removed 1 chassis brace that ties subframe to chassis. On the passenger side.

Disconnected fuel filler from inside the car.

Disconnected fuel pump plug and fuel pipe with use of cutters.

Wiggled fuel tank.

Moved head out of way so as to not get broken face.

Clonk, fuel tank hits floor

All completed off 2 Jack stands and 1 x trolley jack.

Took me about 1.5 hours

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Grant Monkhouse · July 13, 2020, 01:32:15 PM

Fuel tank going spare if anyone wants one. Collection only

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Grant Monkhouse · July 13, 2020, 05:38:48 PM

Just been looking at some gear vs rpm vs diff ratio to mph conversions.

This is 3.9 diff.

Unsure of what diff the mx5 currently has in it but I'm guessing a 4.1? And it is a limited slip as far as I am aware as when I spin one wheel the other stays still. If it was an open diff the other wheel would spin backwards?

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Grant Monkhouse · July 13, 2020, 05:42:48 PM

Here the graphs with a 4.1 diff ratio.

Need to figure all this stuff out so that when I pull the rear end out and put which ever diff back in I don't have to do it again unless I brake it.

I don't want to have to change up into 5th gear on the drag strip so I'm thinking it be better to have a 3.9 diff ratio if I'm only revving it out to 8500rpm.

IF the engine was balanced etc then I would rev it out to 10,000 which would negate chossing between the 2 diff ratios.

I deally want to be banging the rev limiter as I go over the line, also depends on how I tune the turbo size as to where it makes the peak power etc...

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Grant Monkhouse · July 13, 2020, 05:44:35 PM

Something interesting on mazdatrix site, the ring and pinions are listed under rx7 and rx8? Would that suggest they are the same size

Are the rx8 duffs and mx5s the same also?

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Grant Monkhouse · July 13, 2020, 05:45:19 PM

Drivers side lower control arm looks a bit bent to me, compared to the passenger side

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re japi · July 13, 2020, 06:15:19 PM

Quote from: Grant Monkhouse on July 13, 2020, 05:44:35 PM
Something interesting on mazdatrix site, the ring and pinions are listed under rx7 and rx8? Would that suggest they are the same size

Are the rx8 duffs and mx5s the same also?

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Yeah, they are

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Paul_13 · 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