Has any one looked at using a Rotrex unit sinc 10,000-12,000Rpm input shaft =75,000-100,000rpm impeller speed

I can in theory buy a SC kit for my car with one of those... the thing is they are frightfully expensive.

I have seen some of their SC's for sale second hand. If you got one I feel it's simpler and cheaper to just just get a plate made up and run it normally than adding a electric motor to it...

I think for 99% of the people an electric turbo has to be cheaper than a a real SC or turbo or why bother.


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MkngStffAwesome said:
I can in theory buy a SC kit for my car with one of those... the thing is they are frightfully expensive.

I have seen some of their SC's for sale second hand. If you got one I feel it's simpler and cheaper to just just get a plate made up and run it normally than adding a electric motor to it...

I think for 99% of the people an electric turbo has to be cheaper than a a real SC or turbo or why bother.


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I may be upgrading from a Rotrex c30 to a c38 on my Scion FRS .so I could convert the c30-84 in to an electric supercharger. What KV motor would work to get 10,500 rpm on the input shaft and make 35-45hp? I know it’s takes between 35-40 hp of paresthetic loss for my 2.0 L gas engine to turn supercharger with 6 rib belt from the crankshaft pulley. The drive ratio is 1:9.5. So If I could get a electric motor to turn it to 10,500rpm the impeller would be at 99,750. Which would be enough to make 400-420bhp on a 2000cc 4 cylinder
 
I’m looking at using a C30-94 for an electric supercharger, probably best to choose your pack voltage to suit your application unless you are already invested in a battery setup.

Work out required KV by taking max input RPM of the supercharger and divide by voltage.
C30-94 max input 10,500rpm
12S nominal voltage 44v
14S nominal voltage 51v

10,500/44 ≈ 238kv
10,500/51 ≈ 205kv

Those are very low KV, there will be motors out there suiting 1:1 drive with the Rotrex input though

This one is close at 150KV, definitely going to operate at boost making RPM for the rotrex, not going to max it out though.
Turnigy RotoMax 150cc Size Brushless Outrunner Motor
 
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