reading this months por/911 world mag, it mentions future info about strapping the mini-cooper s-supercharger to a 944? anybody out there aware of this mod?, is that possible? what would the bhp be with this mod? sounds exciting as didnt think you could do very much apart from pro-max chip and exhaust on s2s?
cooper-s supercharger on 944
- Thread starter jasonp
- Start date
edh
New member
Would have thought the Cooper S charger will not be big enough for a 3.0 (or even a 2.5) - you'd probably need a larger Eaton charger (M90?)
Unless you are very handy, it's not going to be easy - or all that cheap. You're going to need custom intake pipework, brackets, pulleys, not to mention ECU mods (or replacement).
Peter Empson is strapping a supercharger kit onto his S2 soon - in theory that should be easy as all the above is sorted for you. In practice.....
Probably cheaper to sell the S2 & buy a turbo [
]
Unless you are very handy, it's not going to be easy - or all that cheap. You're going to need custom intake pipework, brackets, pulleys, not to mention ECU mods (or replacement).
Peter Empson is strapping a supercharger kit onto his S2 soon - in theory that should be easy as all the above is sorted for you. In practice.....
Probably cheaper to sell the S2 & buy a turbo [
]si30boxsters
New member
sounds iffy to me!
Diver944
Active member
Jon Mitchell was looking at this a few years ago as more secondhand superchargers became available from Mercs and Minis. However, without doing any engine work to lower the compression ratio then it is not safe to run much more than 5 or 6 psi of boost so one of these tiny superchargers would 'probably' fit the bill and 'could' in theory up the power by 25 to 30%
Peter Empson
PCGB Member
If you're on Rennlist have a look at this thread as there's a new SC kit being developed for the 968 which they are looking to adapt to the S2. Don't know what the price is going to be but it may be one of the cheaper off the shelf options (much less than the SFR I suspect).
Peter Empson
PCGB Member
Been running a bit short of spare time to be honest, the pressure is really on to get it ready for Silverstone but that's still my aim.
Diver944
Active member
www.speedforceracing.com produced a kit a few years ago that use ATi Prochargers, their current websites lists Lux at $5500, S2 at $6000 and 968 at $6500
Ninemeister in Warrington resold the 968 kit but improved it and used a differenet supercharger (Peter E knows a lot about this). It's not on their website anymore but cost was £5750 IIRC
To date I think they have sold between 5 and 10 kits so the price is always going to be high for such a low volume of sales
Ninemeister in Warrington resold the 968 kit but improved it and used a differenet supercharger (Peter E knows a lot about this). It's not on their website anymore but cost was £5750 IIRC
To date I think they have sold between 5 and 10 kits so the price is always going to be high for such a low volume of sales
tr7v8
New member
I have an excel spreadsheet which does s/c sizing (send me a mail to tr7v8 at phaetonconsulting dot co dot uk if you want a copy. The Mini which is 45 Cu Inch displacement is too small, the minimum is the M62 which is 62 Cu Inch from a Merc W202/3. The problem is fitting it under the bonnet, on a 8 Vit may just be possible on a 16V head their is no space. Hence mine when I finally get moving will use a Vortech V5G. These new are around $3,000 alone so not a cat in hells chance of doing a kit for 2K GBP. Brackets are easy, getting it to fit in is easier than the Eaton but still not easy. Percentage increase is directly proportional to boost, so 8PSI is 1/2 an atmosphere. So 3L @ 211BHP becoes circa 320ish, this with intercooler.
Neil Haughey
New member
Miller cycle, but then the problem is this effectively reduces the capacity of a 3 litre to something closer to 2.5 litres. Mazda had a miller cycle engine awhile back that was very well received but it seemed to be a bit of a dead end. This is what I would do though if supercharging a S2 or 968, anything else requires changes elsewhere to lower the CR hence considerably more expense, hence not worth bothering with. If one is lucky (I haven't looked), one may find that swinging the inlet cam by one tooth will give the required retardation. That would make the job a distinct low cost tuning possibility.
tr7v8
New member
Miller cycle lump in the Mazda was very expensive to maintain & had some longevity issues I believe.
With intercooling you can go to 8psi on a 944 without CR reduction. But the Mini blower needs to be spun very fast to pump enough air
& this cause heating losses aside from potential unreliability.
With intercooling you can go to 8psi on a 944 without CR reduction. But the Mini blower needs to be spun very fast to pump enough air
& this cause heating losses aside from potential unreliability.
944 man
Active member
The Mercedes part is similar to that used on many Boxster retro-fit kits, so itll certainly be big enough for 944 engines. I doubt (as confirmed by Jim) that the BMW Mini part will be suitable for a high pressure kit; but itll probably be suitable for a low pressure kit which retains the original compression ratio. Any form of turbo/supercharger is only an air pump after all (as is an engine for that matter) and the Mini supercharger will be more than able to move enough air for 6psi-8psi, Im sure...
Simon
Simon
Hilux
New member
I`m inclined to agree. The modern turbos on day to day cars dont add huge puff but `assist` the puff if you see what I mean.
An S2 will take a slightly higher CR so a useful addition possibly. As always its the cost of re-mapping the ECU, re-plumbing the inlet manifold, intercooler (if needed) and exhaust etc that makes the gains uneconomic.
Neil Haughey
New member
Really? surprised by this as it was a pretty normal engine just with a blower and variable valve timing ISTR to give the Miller cycle effect. The Miller cycle has made a comeback of late in hybrid systems, its main drawback has always been that its very expensive and heavy, as effectively you need say a 3 litre engine to make an effective 2.5 litre motor. Would make sense on the 16v motors as it would be like a 2.5 turbo but with 16v head. Personally though its all so much time and money I can't see the point.
tr7v8
New member
I've just re-run the spreadsheet & the MAX that the M45 can achieve on a 2.5L is 4.7PSI at 16,100 RPM which is 100RPM above peak, the efficiency will be dire at these RPMs as well.
You get 1.5PSI on the 3Litre, it simply is too small.
As a comparison the M62 would give 7.2PSI on the 3L at 16,100RP
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