Try spinning it by blowing into it. The fact that it continues to spin as the motor deaccelerates has more to do with the inertia of the turbines and the effeciency of modern bearings. I don't deny that it takes relatively little energy to spin a turbo. My point is the only "free" power is increasing the compression ratio. All manner of forced induction are alternatives to running a higher static compression ratio and have some trade-offs.

 

you been reading how stuff works?....

 

Actually, the other pistons not in the power stroke will cause more drag with a higher compression ratio. Nothing is free!

Randy

 

Not recently. I'm oversimplifying all the concepts of forced induction but I'm doing so so that the misconception of free power isn't taken the wrong way. Despite our best efforts turbos create a restriction in the exhaust stream and the compressing of air heats it. These are both part of the "cost" of turbocharging. Supercharging is no different in that it replaces the increased back pressure at lower RPMs with parastatic drag at all RPMs.

 

That is also true, I was only thinking in terms of total volumetric effeciency and not really looking at what the trade-offs of increased cylinder pressure and the increase in force needed to create this increased compression ratio.
Again with the simplification. lol

 

I try to keep it as simple as possible and still cover all the bases - pretty hard with these topics though .

Randy

 

Do you guys have any pictures?

 

I've been around the Horn with engine mods on more than a few turbo cars; porsche, vw, saab, and subaru... It's fairly straight forward to dial in boost and A/F (air fuel). In my experience you dial in more whp as you lean out the fuel, trying to avoid getting too lean to where it detonates. I would run different maps in winter and summer to avoids pings (or worse). But, when you do this you are going to see some crazy egt's (exhaust gas temps) and unless you do a "fix"... you will see CEL (check engine lights) from your egt sensor always.

This is my first go around with a s/c car and I am loving the drivabillity (none of that sudden spool). And also the lack of worry associated with mod'd turbo cars as you anguish over insane EGT, warped exhaust flanges, and the knife edge tuning that seperrates whp and detonation... and also, how could I forget, "boost creep" +1 for s/c's

 

That's why I'm so interested in staying with the supercharged route, as opposed to twin-charging or going to a straight turbo set-up. Most of the problems I encountered with modified DSMs centered around the heat of the exhaust and the dreaded boost creep and boost spikes. It also seems the supercharged MINI's don't seem to have as many seasonal problems related to tempurature as the highly boosted DSMs.

 

and the bumble bee can't fly..... meanwhile my car just continues to run strong....

 

I'm personally lovin' this cold weather we are having right now. My stock MCS is feeling rather strong about now. Ambient temps are hovering around 25F to 30F.

 

Single digits here, mang. You need to move further north.

</OT>

 

And mine runs strong as well.......

 

Any chance you would be willing to share some more details? It would be nice to get a few more first hand accounts. The more the better.

 

ha ha don't you know the first rule of owning an M62....

 

 

Now your funny.....

what do you want to know 225 whp and 191 ft lb

 

come on man... that one was accually good....

so... YOUR car is at 225...

but what about this "M7 car".... the kit is not sorted... we know that... so what's the progress... hows the car? It started @ 224.... so did the M62 help?

 

It must have helped it do something...

 

i'm figuring it did... just curious what...

 

does anyone think that eatons new TVS SC will be something to look at in the future? eatons said it would be 2008 before they might have one for the minis (if i remember their email correctly) good discussion.

 

wow... the torque is impressive... but still 225whp for a car that has a head, custom built header, custom tune, injectorys etc... i was hopping for more... i was hoping to see something at least near 260. since about 240 has been made on an m45

 

ooooo.....swift kick below the belt...

 

you know what... all i hear is silence... you know what else... cars don't make sound when they don't run... call it a hunch...

 

Me too, I really thought we would break 250. My car has Randy's head and it is a +1 +1 head...... maybe not the best for the 62. There is some experimenting being done with other configs..... We can get more power if we raise the rev limiter because it is pulling VERY strong all the way up. Since I do not want engine problems just to post a big number I have decided to back off raising the rev limiter.

who has posted 240..... I have my doubts