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Old 27th August 2016, 11:11 PM
JimH JimH is offline
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Join Date: Aug 2016
Posts: 1
Default just starting

hi to all,a short intoduction I am 70 year old semi retired and just started to build a haynes roadster based on the chris gibbs book, in this project i am being assisted by my older brother! Progress so far, we have bought a mx5 and stripped it down,bought the book and downloaded the saturn plans.
The next step is to construct the chassis. This is where the questions start, I would like to use as many of the mx5 components has possible but after reading various comments on the forum it appears the is a problem with the mx5 diff in a chassis built to the saturn plans,would it be possible to strengthen the chassis in the area of the diff wings. Another possible solution I have considerd would be to use the mx5 rear subframe and modify the chassis to suit as anyone done ever done this if not why not. Any comments or advise on the above would be very welcome
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Old 27th August 2016, 11:18 PM
SteveH SteveH is offline
Join Date: May 2015
Posts: 76

Welcome to the mad house
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Old 27th August 2016, 11:46 PM
NeilW NeilW is offline
Senior Member
Join Date: Jun 2014
Location: Sunderland, Tyne and Wear
Posts: 224

Phil aka TalonMotorsport is the guy who can point you in the right direction. Not sure if he is still as active as he used to be but he designed a tmxr chassis (mx5 based). Try a search in the forum for previous mx5 builds there will be anything and everything for you to digest.

Welcome to the forum and best of luck with the build. Look forward to your progress
Total Spent so far - £xxxxx
Last Purchase - Engine mounts, steering wheel, slave cylinder.
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Old 28th August 2016, 06:21 AM
vmax1974's Avatar
vmax1974 vmax1974 is offline
Senior Member
Join Date: Apr 2011
Location: Teesside
Posts: 1,141

Hi and welcome

The problem people had with the diff was that they didn't mount the diff to compensate for the ppf on the mx5 this was solved on a few builds by changing the bushes for harder ones and almost hard mounting the diff nose

Phils solution is ok but if you are wanting to keep the components as standard as possible then maybe not for you
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Old 28th August 2016, 04:43 PM
Ianr Ianr is offline
Senior Member
Join Date: Sep 2014
Posts: 233

On mine I put a sierra diff and book rear end in but used mostly MX5 for the rest of the build ie engine gearbox wiring and ecu steering column. I used engine mounts supplied by Phil at Talon and very good they seem. I have seen several solutions to use the diff from the MX5 and would probably use one of them if I built another.
Good luck with your build and welcome to the group!
My build blog here http://ianhaynes20.wordpress.com
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Old 28th August 2016, 07:02 PM
garyt garyt is offline
Senior Member
Join Date: Jun 2014
Location: Dufftown, scotland
Posts: 480

Hi and welcome. Life will never be the same for you both from now on
I used the mx5 diff et al and as said above mine is hard mounted nose and arms on the basis the Sierra diff was and is ok so mine is.
Good luck with the build and don't be afraid to ask questions the only daft one is the one you didn't ask
All the best Gary
remember we are not mad just creatively insane
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Old 28th August 2016, 07:44 PM
Numplumb Numplumb is offline
Senior Member
Join Date: Aug 2012
Posts: 187

Hi and welcome check out Stot's thread for one idea of mounting diff.
Do a search for Saturn plans for the alterations to book spec for Mx5.
I used Mx5 diff and copied the front mount for the diff from one of the American sites, l also used the mx5 pedals on mine and mounted the diff 20mm further back than book spec which made the handbrake cables miss the frame, if you read some of the threads you'll see what I mean.
On mine I had the brackets made by Phil aka Talon Motor and used the Mx5 engine mounts.
Best of luck with your build.
Regards Mick.
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Old 28th August 2016, 07:46 PM
Cropper Cropper is offline
Join Date: Jul 2013
Posts: 92

Hi, my diff is hard mounted on the nose & polyurethane bushes in the "wings", the diff unit pulled up solid on the bushes & i then made the nose bracket to suit, no problems so far. Depending on your donor you maybe lucky enough to get a limited slip diff as well! Enjoy!
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