It's not a roots blower. It's a twin screw compressor. It has internal compression unlike a roots which only moves air.
The centrifugal blowers need to get wound up like a turbo and their efficiency changes markedly with speed, therefore they suffer from lack of torque down low.
Bit of an update, got everything in and plumbed up, the intercooler was massive and worked sweet, but i had some issues with the hoses getting sucked in and would have been forced to either line them or make them out of aluminium. Given the tight spaces and that the throttle response was diminished with the large air volume. I probably should have used 2.5 inch everything rather than 3 inch everything.
Well anyway, what i'm doing is having a laminova style intercooler cut into a billet of aluminium and that's going under the supercharger and above the inlet manifold. Plenty of height to play with in the lotus.
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Originally Posted by dougie_504
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