Mazda MX-5e Tesla Powered

Mazda MX-5e Tesla Powered

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robcollingridge

Original Poster:

610 posts

283 months

Thursday 23rd March 2023
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The interior behind the seats is now complete. We stripped the front off the car today and found very little rust :-)

The Bearded Tit

241 posts

32 months

Thursday 23rd March 2023
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Cool project. So, it'll be lighter than standard because of all the weight-stripping. Would be interesting to see how the weight compares if the EV swap was the only thing done. How much does one of those Tesla units weigh compared to an MX5's engine and gearbox, exhaust etc? How does it affect the weight balance?

robcollingridge

Original Poster:

610 posts

283 months

Friday 24th March 2023
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The Bearded Tit said:
Cool project. So, it'll be lighter than standard because of all the weight-stripping. Would be interesting to see how the weight compares if the EV swap was the only thing done. How much does one of those Tesla units weigh compared to an MX5's engine and gearbox, exhaust etc? How does it affect the weight balance?
The Tesla SDU is 88kg and it will sit where the diff is currently located. The batteries will be where the fuel tank currently is and will also run along the centre tunnel. We plan to move 12V battery and some other stuff into the bonnet area.

I'm in the process of building my own scales to measure the corner weights.

snotrag

14,459 posts

211 months

Friday 24th March 2023
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Interested to know why your getting rid of the Power Steering? The car was designed with steering geometry to work with power steering and uses the appropriate rack ratio.

The only MX-5s that come without Power steering were those poverty spec, naff run out models and it was done as a cost saving, not a 'performance improvement'. The Non assisted rack is awful.

The infamous 'depowered PAS rack' is similarly awful, generally used 'bEcoz RaceKar!" by people who think not having power steering is cool. Despited the fact the car drives better with it, on road and track.

Smitters

4,003 posts

157 months

Friday 24th March 2023
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Very interested in this. For some exceedingly odd reason I have a desire to EV swap a Morris 1000.

I guess it depends on what you intend to do with the car, but I'll be really interested in how you approach HVAC for comfort and screen clearing. If the power-steering makes a reappearance - because I assume you're going to need a decent amount of front grip to avoid terminal power understeer - Bad Obsession used an electric pump.

Edited by Smitters on Saturday 25th March 07:05

Undercover McNoName

1,350 posts

165 months

Friday 24th March 2023
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Awesome!
I used to own an NA, and can only imagine what it would be like.

robcollingridge

Original Poster:

610 posts

283 months

Saturday 25th March 2023
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snotrag said:
Interested to know why your getting rid of the Power Steering? The car was designed with steering geometry to work with power steering and uses the appropriate rack ratio.

The only MX-5s that come without Power steering were those poverty spec, naff run out models and it was done as a cost saving, not a 'performance improvement'. The Non assisted rack is awful.

The infamous 'depowered PAS rack' is similarly awful, generally used 'bEcoz RaceKar!" by people who think not having power steering is cool. Despited the fact the car drives better with it, on road and track.
We are going to see what it is like without. PArtly to save weight and also because we don't plan a vacuum pump to drive it. If it doesn't work out, we could add electric assistance.

Rob

robcollingridge

Original Poster:

610 posts

283 months

Saturday 25th March 2023
quotequote all
Smitters said:
Very interested in this. For some exceedingly odd reason I have a desire to EV swap a Morris 1000.

I guess it depends on what you intend to do with the car, but I'll be really interested in how you approach HVAC for comfort and screen clearing. If the power-steering makes a reappearance - because I assume you're going to need a decent amount of front grip to avoid terminal power understeer - Bad Obsession used an electric pump.

Edited by Smitters on Saturday 25th March 07:05
The plan is to install full electric HVAC and this will be a test of the system we plan to install in the OSSEV.

Rob

Merry

1,370 posts

188 months

Saturday 25th March 2023
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snotrag said:
The infamous 'depowered PAS rack' is similarly awful, generally used 'bEcoz RaceKar!" by people who think not having power steering is cool. Despited the fact the car drives better with it, on road and track.
We did that with our Mx5 track car. It was better depowered, on a track at least.

Could be a personal preference thing and can totally see why you'd avoid the complexity with this build.



robcollingridge

Original Poster:

610 posts

283 months

Saturday 25th March 2023
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We have finished stripping down the front end and treating any rust. The whole front end and the constituent parts of the bumper have been done. It's now time to put it all back together!



Whilst we are not using the 1.6 engine in this project, we are spending a lot of time to check it is all running well. It's only done 80,000 miles and would be an ideal donor for my son''s 1990 Eunos Roadster 1.6 which has done 135,000 miles.


robcollingridge

Original Poster:

610 posts

283 months

Monday 3rd April 2023
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We are currently stripping out the dash, to replace it with a new black one. New black carpets and door cards going in too. Hoping to MOT the car very soon but we are also replacing the whole braking system first.



Moderator edit: please don't link to your own website

robcollingridge

Original Poster:

610 posts

283 months

Tuesday 4th April 2023
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And the dash is out. Hard work!



Pretty much all this is going. The car is being re-wired with a CAN bus and we are even contemplating a bespoke dash to save even more weight.

ChocolateFrog

25,373 posts

173 months

Tuesday 4th April 2023
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robcollingridge said:
No joke. It will weight less than the original Eunos Roadster we have just collected. Slightly less range though :-)

Yes, more involving to drive too. Loads of driver focussed upgrades including ditching the power steering, improved suspension, better brakes, sports seating with 6-point harness, etc. And 295hp
Sounds ambitious, must be a very small battery to get it lighter than the original car.

madbadger

11,563 posts

244 months

Tuesday 4th April 2023
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Great project.

Looking at changing the RF for an EV as it is mainly used for commuting. Can’t help but think if Mazda did an E-MX5 we would be looking at that.

thecremeegg

1,964 posts

203 months

Tuesday 4th April 2023
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Ooooh this looks exciting

Register1

2,142 posts

94 months

Tuesday 4th April 2023
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Awesome

robcollingridge

Original Poster:

610 posts

283 months

Thursday 6th April 2023
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ChocolateFrog said:
Sounds ambitious, must be a very small battery to get it lighter than the original car.
About 30kWh, giving a range of 120'ish miles.

Rob

robcollingridge

Original Poster:

610 posts

283 months

Thursday 6th April 2023
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Our plan A is to do something radical and build a custom dash and this is what we will be exploring in the coming weeks. We can reuse the metal support frame.

robcollingridge

Original Poster:

610 posts

283 months

Thursday 6th April 2023
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If this doesn't work, our plan B is to fit this new black dash.


robcollingridge

Original Poster:

610 posts

283 months

Thursday 6th April 2023
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The 10" infotainment touch screens arrived today. These will be separate to the car's instrumentation and are basically stand-alone units that support Apple CArPlay and Android Auto. Really good quality and very responsive. Will be mounted centrally.