which mx5 used a 35mm caliper piston?
only ones i have listings for are 31.7mm
and that is for every model of mx5 that was made 
In about 1 hour when I am at work I will get you part numbers from textar and jurid for the 35mm calipers
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MX5 series 2 (NB) 11/2000 - 01/2005
TRW part number
Left BHN1182E
Right BHN1183E
Textar part number
Left 38247900
Right 38248000
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There is also a listing for 32mm calipers, maybe it depends on the engine size?
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Every engine size i clicked doesnt show them although the turbo model didnt show a listing so possible it then.
Iâm a bit worried about the rear springs, the Mitsubishi springs are only 2cm shorter (free length) than the factory springs, but with the increased spring rate I think they will give me a ride height the same or higher than factory, which really sucks because the diameter, spring rate and end types are pretty much perfect. If I cut a coil out to get the correct ride height then the rate will increase which is something I donât want because 435 is all ready on the higher end of what we worked out I should aim for.
I have found a company in USA that makes lowered springs for the Mitsubishi L200 and I emailed them asking the free length and spring rate, which is 8.8 inches/22.5 cm and 520 lbs. This also sucks because the length is perfect but the rate is too high 
Now Iâm thinking I will take the measurements of the 2WD rear eibachâs (the 2WD rear springs are longer than the 4WD rear springs) and do some calculations to see what the rate becomes with enough coils cut out to give me the desired ride height for the 4WD, maybe if Iâm lucky it will end up being around 360lb, I really really hope 
Otherwise do you have any ideas or know of any other size charts apart from the moog size chart?
I have found eibach part number 1000.375.0350S but itâs a coilover spring designed for off-road, but itâs the right dimensions and 350lbs or 61N/mm so pretty much exactly double the front. Do you think it will work in my application? Or is it not suitable because itâs designed to use in a coilover?
Coilover? 1 7/8, 2, 2 1/4 or 2 1/2 id? They are the possible variations on a coil over. So you need to have spring seats that match as they wonât sit in the std seat.
Sorry I have no source for checking/matching springs. I just have my suspension mate call King springs and they do the checking on what fits what or if a full custom set up is needed.
The place doing lowered L200 spirngs - if they are making them they should be able to make a set with a smaller diameter wire for a lower rate.
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They are 3 3/4 inch I.D, they are the right size to fit straight in and the free length is 10 inch/25cm so they should give me the right ride height. Is there any reason why coilover springs couldnât work?
Will probably cost me an arm and a leg to get them shipped to Germany, and from what I can see this seller doesnât offer international shipping 
The other problem I have with going down the coilover path is TĂV, I think itâs very unlikely that DSport would be TĂV compliant, but I already have certificates from Koni and GAZ
Cert 9001-2015 12-2016.pdf (79.1 KB)
StoĂdämpfer eintragungsfrei englisch.pdf (41.2 KB)
Here is a size chart from eibach
ERS_20_applications.pdf (6.1 MB)
If you scroll down to the off-road coilover section youâll see the spring Iâm talking about, 10" x 3.75" x 350lbs. But Iâm completely lost as to what the difference would be between an off-road spring and a normal spring would be?? Different material or different range of sizes or??? And I understand in a coilover the spring has a very controlled range of motion only compressing vertically, does anyone know if a coilover spring used in a conventional application would be ok? (I donât see why it wouldnât but at the same time I have no idea haha)
@Mr_Gormsby I feel a bit stupid asking some of these questions, I just went through your build thread again and I have seen you are using coilover type springs in the rear of your car 
oh well, at least one good thing that came from all this is now the community has access to another spring chart with sizes and rates 
I think I will order some when I get a chance, but probably not for a while, I have enough things to do to the car in the meantime.
Man it sucks being on the other side of the world, I often log on during the day here which is the middle of the night over there. It feels lonely here and I often find myself talking to myself here and solving my own problems haha do you think these are the first signs of insanity? 
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Not insanity at all, I understand completely. My better ideas come later into the night, when I am alone with my thoughts.
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Normal spring prob refers to std rate. Off road must mean increased rate or that the way itâs wound it has a tiny bit more travel before coil binding.
You have to explain what you mean by âanyone know if a coilover spring used in a conventional applicationâ? The spring ends are unlikely to sit on original perches due to shape and daimeter. If the perches were changed to match they would work.
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At 3.75" these off-road coilover springs will fit the factory spring seats perfectly, although the rubbers might need a bit of work to accept the squared and ground ends on the coilover springs.
When I ask âanyone know if a coilover spring used in a conventional applicationâ I think the more appropriate question would be are there any differences between a spring designed to be used in a coilover and one that isnât (apart from the ends of course)? And are there any particular reasons why it shouldnât be done?
But these are questions I was thinking of before I realised you were using coilover springs in the rear of your car, which pretty much cleared up the whole âis it possibleâ question
@Mick just to change subject and dunno if any good to you but there is a bloke selling a rally 4 on the daihatsu performance enthusiasts page on facebook, failed MOT so might be reasonably cheapish?
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Would be super nice but right hand drive, here in Germany the cars are LHD 
Would be awesome if someone bought it to wreck though, camshaft are on my wish list 