Tempting. You get turbo-like efficiency but roots-like throttle response--good for about 300hp(?). Kudos to Longboard Mini for donating a MINI to science.

It will be interesting to see how it works out over time, but for all the effort I might be inclined to go with a turbo and go way north of the target output for this project.

 

If you want more info, the R53 and other CAIs have been discussed ad nauseum in the M7 CAI thread.

 

In theory the roots should produce tq sooner than the rotex BUT RMW/Longboard will be able to tell us what that gap is shortly. Its a question I raised a while back w/ Jan who at the time did not know because of the early stages. The other thing to bear in mind is the performance of a rotex w/ head, cam , header, ect.......................

Perhaps Longboard would be willing to strip all the other goodies off and give us some plain old rotex numbers

 

In theory the roots should produce tq sooner than the rotex BUT RMW/Longboard will be able to tell us what that gap is shortly. Bear in mind that th erotex will produce linear TQ so at some point it has to produce more TQ than the roots. Its a question I raised a while back w/ Jan who at the time did not know because of the early stages. The other thing to bear in mind is the performance of a rotex w/ head, cam , header, ect.......................

Perhaps Longboard would be willing to strip all the other goodies off and give us some plain old rotex numbers

 

(Moved over from the New Voltage CAI! thread.)
Given the enormity of the TMIC, did Jan consider going to an FMIC?

 

Very nice job on the Intake. Like how it matches the other parts and hoses.
Very cool.

 

WOW!

 

No need. The new intercooler cools great. The main reason was to flow more air which it does by double.

LB

 

Here are more pics.

LB

 

Quote " In theory the roots should produce tq sooner than the rotex BUT RMW/Longboard will be able to tell us what that gap is shortly. Its a question I raised a while back w/ Jan who at the time did not know because of the early stages. "



The above is not a theory, it’s a fact. Both roots and twinscrew produce more torque through the usable power band than centrifugals. Although a "usable" power band can be questioned by racers, normal driving permits a usable torque band from 2k to about 6k on a Mini Cooper unless you’re Michael Andretti.

This is where things can get interesting. The roots blower will be the first to fall short of torque at upper rpms although it’s very capable in low to midrange torque. Take the example above of a usable torque curve and remove another 1k. Meaning a roots blower will produce more torque compared to a centrifugal from 1k to about 4500 rpms on a Mini.

A twin screw blower again exhibits the same trait of being a torque contender as the roots blower; however being better in design the torque curve will be greater through the torque band. A twinscrew supercharger will produce more torque than a centrifugal and a roots blower from 1k rpms to about 6k rpms.

Now the centrifugal supercharger is pretty different in design compared to its cousins. The centrifugal shares a lot more characteristics to a turbocharger in design and looks. A centrifugal blower makes less torque than both roots and twinscrew in the usable torque band however just like the turbo will make more peak torque at higher rpms. A centrifugal will make a lot less torque in the usable power band of 1k to about 6k but make more peak torque anything higher than 6k rpms.

What’s does all the above really mean.

In straight line acceleration test from start through 6th gear a roots style blower would loose to both centrifugal and twin screw superchargers it’s a known fact.

A centrifugal will fall short in the areas below 6k and prevail in the upper 6k+ rpms. However the centrifugal still has a higher peak number, like any of the above style superchargers eventually once peak torque is produced well it will be downhill from there.



I hope all the information if any helps on clearing up some questions or thoughts on how the superchargers differ from one another.

 

Now lets talk about the heat difference between the two as mounted on a MINI.

 

When we talk about thermal efficiency we should also cover the difference in pressure ratios and how they all reference to heat. Please begin the conversation I think this can be very informative for all.

 

So what's your estimated whp now Longboard?

 

why after reading this last page do I feel so much smarter?

 

sweet!! now you can go build fast cars Jan!! you've been enlightened

 

it's amazing how much I learned today... wonder how I was even able to figure out a system like the Rotrex

wonder how long it is before someone tries to steal this....

 

I guess they didn't read the whole thread. This has been talked about many many times.

The Rotrex is not your standard centrifugal. Not even close.

Longboard

 

Im confused where did this conversation go.....We went from talking about superchargers to stealing???????

Sucks Jan who would want to steal your designs and all of your hardwork that bastard should be shot...

My two cents I will keep in my pocket and off this thread....

 

I've got a 40 cal, wanna borrow it?

 

Clarify

 

just when we thought Gintani learned their lesson...

 

What happened to Johan's Mini. You were days into the tune and said the numbers looks really really good and you would post vid and numbers that day. That was over a month ago now? That's got to be one hell of a tune.

Longboard

 

If your talking about over 300hp on the stock supercharger, then yes you are all correct its one hell of a tune......

 

so, let's see it? you should have the motor all back together by now.

 

Is that the rumors rofl......I will be scheduling a dynapak dyno test for comparison. Gintani will give you what you want to see no problem.



Johan can you also please post some vid of your car.....Lets end these rumors once and for all.