So glad I found this. I’ve had my new MX5 for a month and on my local b roads it honestly feels unhinged, the front tucking with the slightest lift and the rear being disconnected. Just started looking at suspension mods and I think I’ll add a rear strut to the list. One of my thoughts was maybe the KPC system (I think it brakes the inside wheel) was doing it’s thing and unloading the outside wheel, though the way to test that is turn traction fully off and it still felt the same to me.

I know exactly what pop you're referring to. Mine is left-hand drive for the US and does this on left-hand turns, so I'm thinking it has to do with seating position. That leads me to believe it does it on both sides regardless, but it just feels dramatically different depending on which side. Similarly, I've had passengers say "did you feel that?" when I didn't feel a thing, and vice-versa. It was one of the first things I noticed when I bought the car. A shock tower strut is likely helping by reducing chassis flex. From what I've gathered from professionals, flexing in the chassis makes it difficult for suspension parts to work properly. Hope that helps, either way, I don't think you're crazy.

Hello. How about going to the Mazda dealer and test driving one of their MX5? I also think I have an issue with weird rear end stability, I havent fine diagnosed the conditions as much as you but I run a completely standard car and have the "problem" which makes me keep the traction control on in perfect dry conditions. I will be completely redoing the rear end suspension with new and uprated bushes, all of them, its hugely expensive and powerflex and only just this week made the bushes needed for the whole hub carrier/knuckle, before you could get other brands to get the 2 per side spherical bearings, but that still leaves all the others in the carrier/knuckle. Anyway I will try that and all new either OE or uprated link arms etc. I will be keeping standard dampers and springs. I had the rear brace like you fitted but realised I didnt want to cut the carpet or fuel pipe shield, so returned it. I should have tested it. I have put on 15" wheels and smaller tyres for weight saving. Acceleration feels nice, way too small diameter at moment but using up tyres before I fit bigger ones. I have a lot less grip now overall, but I think this is actually much better to discover the balance of the car, I can lose the car at very much lower speeds making it safer to test if you know what I mean. The behaviour of the rear is the same. My mind is focused on the bushes until I get them all fitted and still have the problem! We will see. Just and idea, lets say your rear brace has somehow given you more rear grip by spreading the loads more evenly, this might mean you still have the problem but its now at higher mph it will suddenly bite you. Try fitting some cheap nasty budget thin small tyres on spare wheels and see if the same overall balance is there at the lower speeds.

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Could the sensation you're having be more related to how the diff works? With this car, on a fast corner at high rpm, if you suddenly lift off the throttle the rear end would come loose or seem to come loose. This is something the ND3 was trying to fix. I have an ND2 and this is not an issue for me. I just know it behaves like that. If you want to check for chassis deflection you can just put a laser pointer on one of the shock mounts, raise the opposite end and see if the point where the laser is changes.

You didn't mention alignment. That's the first thing I thought of when you mentioned a difference between left and right turns. In a Miata, the suspension loads are transferred to the pick up points of the arms. The forces at the top of the shock are much less significant to handling than they are on a car with a strut suspension. It's hard for me to see that the bar that just supports the top of the shocks could make much difference to handling, especially at the rear where the "tower" is really not present. Did you ever try swaping the right and left rear wheels? Are you sure everything is tight and in good shape on both sides of the car?

I followed your Nitron issues on the lotus forum. Glad you finally got it sorted.

Now that your still alive whats it sound like?

I can't wait to see how the new exhaust system, but especially the headers, change/alter the sound. I think the stock series 2 (400 / GT) sound is incredible, but there are definitely bonuses to changing the headers (performance increase, less heat, less weight, more engine bay room, etc), but it will be interesting to see how the sound changes. Are you planning on running the stock backbox with the new exhaust system? Can't wait to see your follow up video(s)! A driving one under load similar to this would be useful to help compare the changes. Good luck!