Supercharger Boost Control

[Yazza54]

Hi gents

I'm looking to supercharge the B18C type R Honda engine in my GTM Libra. For various reasons I want to use a centrifugal vortech supercharger.

I'm happy with the application etc but this will be my first venture delving into force induction - most people who use a centrifugal supercharger select the pulleys based on the max impeller speed they want to run based on a estimated max boost. For example the vortech I want to use can have a max impeller speed of 52000 rpm, but I know some people who use the same unit on GT86s run them at 42000rpm at peak engine revs which gives them 9psi at maximum revs, so they have a linear power spread but only ever get their maximum boost at peak revs.

My question is, can't I just forget all that and run it at 52000 rpm at peak engine RPM and control the boost/bleed off somehow, to gain mid range and build the boost earlier?

[Yazza54]

You're probably right, geared for max impeller RPM at max engine RPM only gives me about 3000 higher impeller rpm at 4000 engine rpm than if I had it set to give me what I want at peak rather than bleeding off. Not worth the additional complication

Edited by Yazza54 on Friday 8th September 11:45

[Yazza54]

SuperchargedVR6 said:

You won't be wanting a centrifugal blower then.

I am aware of the characteristics of a centrifugal supercharger mate. Just thought this may optimise the setup a little, but given the impeller speed difference at low-mid RPM it's not worth the bother.

Edited by Yazza54 on Wednesday 13th September 20:48