The Moss Kit is a new one (hotside) based on a 62 cubic inch supercharger. The old JR was a 45 cubic inch. The 62 flows a lot better than the 45 as well and has more potential for boost (probably 20 psi or even more really).
I believe there is the the odd brp kit in Oz but I don't think anyone apart from ChrisP in Adelaide and myself have an MP62 based kit (we have the Fast Forward Kit). Nobody over here would have the Moss Kit as yet.
For my FFS coldside presently I am waiting on my install to be finished which has had the odd space related challenge - therefore no impressions from me yet (Chris loves his though and recently achieved the target hp numbers). On an NB8A there is an issue with location of the brake lines requiring some re routing, on an NB8B whilst its a squeeze there are far less issues.
Re the Moss kit or Turbo? Depends on what you are after. If ultimate HP was my only goal I guess I would have gone turbo. It wasn't though. Basically I wanted 140kw atw & cool noises coming from under the bonnet along with factory driveability etc. I have no doubt in my case that a turbo would have been a bit easier to fit in hindsight.
For me the road less travelled was the one I wanted to take to achieve my goals though hence I ordered the FFS kit. Tom the guy that runs the business also provides great service which is certainly a commodity.
As a counterpoint there are also heaps of people on this site that love their turbo kits and there are certainly many with impressive HP numbers. I'm sure they are great to drive but given the choice it wasn't for me.
If you are unsure of which way to go maybe you should experience a Supercharged and Turbo'd MX5 via the passenger seat of some friendly club members and decide for yourself on that basis.
Comparing the Moss to the FFS. The Moss kit being a hotside is more conventional, therefore you will have far less install issues. The PC pro that comes with the kit by all reports is a great piggyback (FFS kit has two). You can also intercool it which you can't do with the FFS coldside.
That said the other thing you might want to consider is that if you prefer a hotside, Tom from FFS also markets one these days similar in config to the Moss. This also comes with a PC pro (x1 or x2 I think). The postive about both Tom's kit's is that there are people out there that are actually using them at the moment. Tom has done a lot of R & D to make sure they work.
The Moss kit whilst basically the same is somewhat of an unknown at this stage (there could be subtleties in the config of the PC pro for example). I am also unsure of whether the moss has a 4 rib or 6 rib pulley, 6 rib is better (FFS use 6). The Moss kit does have timing control as well though which is an asset. The FFS kit is a few hundred USD more expensive which may or may not matter to you.
Something that was important to me is that the coldside kit was carb (emissions) approved in california. I believe Tom is in the process of going for carb approval for the hotside. If you plan to get it engineer certified (and really, you should) this could be an advantage - not to say the Moss kit wouldn't be capable of passing an Aussie emission test also however.
To further muddy the waters \"16bit\" is currently having bulletsportscars install a rotrex S/C on his car. His thread is entitled \"Mule Car\" just below. Sounds like it could be interesting. If After deciding which way to go you favour a S/C then it might be good to see what his results are like at least. It will after all be locally available.
Hope you find the above vaguely useful
Steve
