I remember talks about new and improved SC for the Mini a while back. Has any of them materialized yet?

Does anyone know if the standard SC is ceramic coated?

 

If you mean other Eaton models that make more boost, I think I remember hearing about it a while back. Lately, I only hear about ported & polished OE units, but it seems likely that bigger gains could be had with an out-and-out replacement.

Also, it's my understanding that sometime during the '04 MY, MINI switched over to ceramic coated SC's.

 

There is barely any room for improvement in any roots blower, it's the most inefficent design. Replacement is the only big bang option. Yes the '05's at least are coated now. It doesn't make much difference though. Even porting barely makes a difference. I ported and coated my M90 on my other car. It helped with heat soak, that's about it. On the Mini though, the intercooler helps 10x more than s/c improvements.


The only big advantage to other units (Eaton roots) is the construction of the unit, others having separateable snouts, allowing for keyed pulley's. On my other car changing the pulley is simply unbolting the end nut and sliding another size on to suit my conditions. It takes litterally 5 minutes - makes it great to go from track use to drag use to street use, towing, changing octane requirements, etc.

 

http://www.magnacharger.com/aboutus.htm



They can no doubt answer any questions you have.

 

Anyone know the model number of the Mini's SC? M-?

 

45

 

You can see all the specs. there.

 

IIRC, there has been some speculation about whether the supercharger in the MCS is an M45 or an MP45. What is for sure is that it is not an off-the-shelf supercharger from Eaton, since it has the water pump drive, special mounting bosses, etc.

 

So what is the real answer in terms of getting more power? bigger intercooler or changing the SC?

 

Both.

 

As stated on the site;
"The Magnuson/Eaton Model MP45, 4th Generation is a “State of the Art” supercharger, engineered for 1.0 to 2.4 liter port injected engines."

Magnuson 4th generation superchargers have internal bypass valves < ours is external
This is confusing because here they refer to the MINI supercharger as a Gen 4 here,
http://www.magnusonproducts.com/rema...minicooper.htm

I think we have an M45 with an adaptions to drive the water pump.
There is a lot of other info as in specs. on efficiency here,
http://www.magnusonproducts.com/mp45.htm check out the CMF out put rating.

I believe these apply to the M45 also since it's the same displacement.

 

I am very interested in this so if anyone has any info please come forward. There is a story that the SC mods are more effective in lightly modded cars (14 - 20 hp) and marginal to non existent ( I heard of a loss of 4 whp on one car) increase as the car gets more heavily modded. I have heard good things about Endyn and their work seems to be the best in terms of gains....I have no proof..... Henry in England was going to post his results after adding the M7 but I have not seen anything. Randy Webb says he can't detect a noticeable improvement. After I get my intake from Randy I am going to make a decision on the SC. The car is running strong now so I am not terribly motivated. I have already posted that lightly used SCs are available on Ebay.uk for very reasonable prices look for $100 - $150 in freight.

 

IMHO, replacing the supercharger is the better way to go, as long as you can afford it. Not only would you be improving the thermal efficiency (reducing the amount that you are heating the air) but you'd also be improving the mechanical efficiency (how much engine power the supercharger uses). Of course the above would only apply if there were a bolt-in supercharger replacement that offered both improvements.

 

Hi Andy,

But replacing it with what is my question? I noticed a nice increase when I replaced my IC..... if the gain was that dramatic I would do it in a heartbeat.

Bob

 

I spoke with a rep at Magnuson, the US distributor for Eaton about this yesterday. He told me that years ago the aftermarket porting was helping a lot because the superchargers were very inefficient. But he says now Eaton is producing much more efficient superchargers, the porting and polishing will only help to tweak a setup and is not worth the $500 - $1000 that people are paying. He also said that the powder coating on the the JCW and 05 minis help reduce heat soak, but it's not ideal if you are using boost fuels such as nitro. He said the older caoting is much better if you are running nitro or plan to. I also spoke with another company called Stiegemeier that specializes in porting superchargers. They claim a 10 - 15 hp gain for the Mini. I don't know about that , but in reviewing their web site, there was some speculation about the ported superchargers losing boost and torque on the Mustang Cobra when the cars were more heavily modded. Thae issue seemed to be resolved by closing up the vacuum hoses that are coming ut of the supercharger and then it showed some gains. They did a dyno showing before and after. That may explain why the Endyne approach may be showing some gains, while i believe one person reported a loss from M7's supercharger.

By the way, this notion about getting a supercharger for $100 - $150 through ebay needs some clarification. It is not US dollars, but British pounds, which pretty much doubles the price for us. Plus shipping is over $100. So, one would be looking more realistically at around $400 - $700 US for a good used supercharger.

At this point i think i'm modded out, the next cost effective step would be to port my own supercharger or go with a turbo when the technology is there.

 

What about an increase in displacement...to 1.8 litres either thru stroke and or, piston diameter???

 

Twin Screw (if only)!!!

http://www.kennebell.net/

 

:smile:

 

[QUOTE= They did a dyno showing before and after. That may explain why the Endyne approach may be showing some gains, while i believe one person reported a loss from M7's supercharger. [/QUOTE] Thank you for your input....
Your information is wrong, the car that your alleged loss of horse power
come from a car that was basically at its limits before the SC upgrade.
The dyno operator lost 2hp after the SC upgrade, at 229 whp versus
231 whp now that’s a whopping 2hp difference, well within the +/- fudge factor on any dyno.

The SC applied to a JCW with an upgrade of a 16% pulley and a basic
MTH map , did dyno a very impressive 17whp over the stock JCW hp levels.

And where have you seen a dyno map of the "better" Endyne performance,
not here on NAM......

 

I dont know of to many people who have cracked open Mini blocks yet. There are a couple really fast Minis in Chicago, and they all have stock bottom ends. Another option that I havent heard of anyone running is a higher compression piston.

I'm pretty sure that the Cooper runs a 10.6:1 piston, and they are both 1.6L with the same bore and stroke. So swapping in some Cooper pistons would be a great increase in power. Now...I dont know if the MCS pistons are forged and the MC's aren't...something to think about though.

From the Tritec site I've found that the valve sizes are the same, and Im wondering if the blocks are interchangeable...that would just mean that you could swap blocks rather than having to get pins pressed out and avoid the entire disassembly of the block. They are both cast iron blocks..im going to call mini and find out about forged vs. unforged pistons....

Well...no word from my dealership. *shrug* "the guy who would know left for the day"

Anyone know whats forged or not forged in the MC, and MCS?

 

[QUOTE=M7]You see my list of mods........about everything without turbo or nitrous. With a proper Unichp tune what do you think the gains would be on my car with the M7 ported SC? 10 -20 whp? (I am adding WMS ported intake)

 

102hp is within the dyno fudge factor?

 

That is gonna be a really tough call IMO. You may be looking at levels approaching the maximum flow of your head already, or you may not. If you can flow more, then power goes up when your SC flows more. If not, it may stay essentially the same? I think?

PS: I have an M7 SC, and my installer who has an S himself said, "I need to get me one of these!" So, take that for what it is. The thing spins a lot more freely than my old one did. [I still had the stock airbox on at that time].

 

really is to bad no twin-screw. it would be sweet if someone figured how to plop one on. here is a good SC (click on supercharger system) that is being used for classic volvos, gets full boost at 1500 rpms... made in sweden by Autorotor, maybe they can make a special one for the mini

 

The RMS twin screw that was tested by Webb used an Autorotor twin screw. FYI.