John Cooper Conversion 90hp. (26 replies)
What's the opinion of the new John Cooper kit offered by Mini Sport. I am considering fitting one to my MPI.
Yep, got the is understanding now. Being an engineer and tech author (in another field - and guilty of same.....) I'm familiar with the creative accounting relating to engineering and engineers figures. Just confused about the actual wording. Got it now N-M and Mini's to
What a great thread this one is guys ?!!...the only actual BHP that applies to an indiv car is that that's shown on a Dyno/Rolling road after the cars been fettled/tuned set up etc etc... even then it cant be deemed as 100% perfect.. for example take 2 S jcw upgrades and I bet both would show diff output dependant on indiv cars condition/wear etc.. Mine showed just under 100 BHP etc etc...that's purely down to all the modified bits and bobs in my car,carbs,crank,cam,cyl head mods,exhaust etc etc....tested a car is what it is !!!... foxy52.
The point that seems to be being trailed in the thread is this John A. You'd feel a bit miffed if you went to Waitrose and bought a load of stuff at Waitrose prices and found that it'd been bought in from Asda/Walmart. Even though there's nothing at all wrong with Walmart.........
When I was at John Coopers collecting the S Works in 1999 I saw in the workshop 3 mpi kits ready to fit and they were in clear plastic bags with Minisport written on them in red. Minisport did supply Mpi kits so I don't see any reason why they should not be able to market them now.
[QUOTE=Graham Bichard;n167186]I think it's down to the ECU restrictions, mostly the fuelling. The ECU doesn't have the ability to deliver sufficient fuel, thereby running weak at top end, limiting power. One remedy was to fit a high pressure fuel regulator (wasn't it part of the original Cooper kit?), but general experience suggests it still didn't allow 90bhp, and tended to mess up the fuelling elsewhere in the rev range.
But I can only really comment on my own experiences, with my own 'kit', which produced 74bhp on the Slark rolling road. I'll let you know what the 'big bore' produces, as and when it's ever completed :([/QUOTE]
Sorry to join in a little late but agree with comments by Graham based on personal experience. Don't expect 90bhp or anything near it. I had a Palmer Brothers S Works kit which was based on the original Cooper Works and though I have no complaints about the quality of the kit and fitting I only get high 70bhp even after fitting a high pressure fuel regulator afterwards from doing some research. I would say that even though it cannot get the extra 'potential' performance down to the wheels it's much more accomplished and stronger with the pick up in 3rd and even 4th doing when doing long motorway journeys.
I just think the ECU is just not letting the improvements work to their full potential with the MPi. The MPi ECU is a bastard thing.
The other major killer of performance for the mpi is the final drive ratio...done to appease the e.u. or for emissions or something...