Brakes Idea 1st Gen Most liked posts in thread: A possible different bigger brake idea and, Meth Injection and more

OK, found some different data. Appears the stock crank is 140 mm and the stock sc pulley is 65.5 mm. The JCW pulley is 58 mm (about 11.5%), the 15% pulley is 55,7 mm, and the 17% pulley is 54,4 mm. Last the ATI 2% overdrive crank pulley would be 142,8 mm. On redlines, it appears the start is 6750 with fuel cut out at 7000. The problem is that if you use standard pulley ratios the stock and the JCW is reflected below but everything that Eaton has says 10 PSI at 14,000 RPM: 1.) Stock = 140/65,5 = 2.14 x 7000 = 14,980, 2.) JCW = 140/58 = 2.42 x 7000 = 16,940.

There may be some factors involved so using the 2.06 I have in a post above we have:

1.) Stock = 2.06 x 7000 RPM = 14,420 SC RPM
2.) JCW = 2.06 x 1.115 x 7000 = 16,078 SC RPM
3.) 15% = 2.06 x 1.15 x 7000 = 16,583 SC RPM
4.) 17% = 2.06 x 1.17 x 7000 = 16,871 SC RPM
5.) 19% = 2.06 x 1.19 x 7000 = 17,159 SC RPM

If these values are somewhat correct than the JCW SC RPM value is well above the 14,000 value that Eaton publishes for the M45. I have seen posts on other types of forums that talk about porting the SC in an effort to aid in lifespan when pushing higher RPM's. The question is where is the magic redline for the supercharger and does anybody have pump curves for the water pump so it can be determined where cavitation commences.

 

Wow are you the same guy I saw driving the black coupe at MOTD this year?????

 

I thought that looked like a rug on your head . . . . .

 

Now back to the jacked brake thread, I just read something from years back that the M45 max is 16,000. It also appears that my 2.14 pulley ratio is correct. That means the JCW is pushing well over the 16,000 value.

So how many 17% pulley folks we have here and many miles on the car after changing to it?

 

G

Gee you guys here are sooooooo helpful. I am going to run down to Walmart and buy me a bunch of that blue stuff. The more expensive winter stuff is not on the shelves yet.

The money I am going to save . . . . . .

 

But the beard, perhaps its his brother???????

 

Do you have an electric waterpump?

Back to pulleys, running just numbers if the Redline Cutout was lowered to 6500, then a 19% pulley, that would provide more low end torque, would be spinning the supercharger at around 16,500 that is actually lower than the JCW pulley does. I could be way off base but what I am thinking is the heat is caused by the boost/pressure hitting the valves, backing up and causing the sc to work harder. So how does a cam and a high flow exhaust help mitigate the issue as they both let the air flow better through the system?

 

I need to do some research on a way to lower the redline. I know it can be done when you are tuning, I am wondering whether something like ista can do it.

 

Yes I know, blame it on NAM

 

I will do some data logging on both the boost and intake temperatures. You have the Mistress running like a rat on Walter White meth so I am thinking with the cooling of a low injection of 70% water and 30% meth either an 18% or a 19% is in my future.

I also work from home, getting my SS check each month, so my car is not driven that much. Guys like Teddy and me just need all you younger folks to keep working so the only work we do is think of ways to spend our handout each month . . . . . .























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From what I have read and some common sense, it appears that as allot of the heat build up from the SC is that it can create more air than can go through the intake valves, the backpressure equates to more resistance that therefore results in more heat. With a cam, a header and a high flow cat, my boost values are down around 11 PSI, at least according to my very inexpensive mechanical boost gauge so a couple more PSI from a smaller pulley might not be that bad. Next, the boost developed from the Eaton is not completely linear but it is closely related to the engine rpms.

Now if the you can believe all the literature from Eaton that the M45 was made to handle 14,000 rpms and that the maximum spin rate could not exceed 16,000 then there are more than few MINIs that exceed that value each day as every JCW every produced either by a dealer or the factory exceeds the 16,000 limit. Then you add on everybody that ever put a 15% or higher number value pulley on their car. Last you have the Mistress with her equivalent 33% pulley. A MINI with a 19% pulley and at an engine rpm of 6,274 has a supercharger spinning at 16,000 rpm. At 6,500 rpms this same equipped 19% pulley car is matching the JCW supercharger spin of 16,583 rpms. These are approximate but for discussion purposes I would think they could be used.

On the water/meth injection rate, I am thinking the water being the larger percentage does most of the cooling and the methanol with its high octane but low btu release helps level out the gas amount that is displaced by the injection while at the same time helping to keep EGTs down. The MINI and its narrow band O2 sensor cannot significantly moderate the gas volume displaced by the MI mixture, I thought from what I read. Would think this is basic physics and the engine design does not carry that much of an impact. Hopefully somebody a whole lot smarter than me will chime in and point where my logic is flawed.

Yes any time alky is added into the mix, oil dilution should be addressed but most of what I read deals more with methanol oil dilution due to the methanol being the only fuel agent and remember that it takes about twice as much alcohol to create the same energy output as gas; 30 mpg on gas but only 15 mpg on methanol. I have read that MI varies from 10-12% on the low end to possibly 25% on the high end. So if the Mistress is at that high end then for every 128 ounces (1 gallon) of fuel (gas and MI) consumed by the engine there is approximately 96 ounces of gas and 32 ounces of methanol. On low percentage MI with a 70% water/30% methanol that 32 ounces is reduced to approximately 4 ounces.

I am hoping that some long slumbering MA members that have forgotten more about MI than I will most likely ever know will make some posts here.