"wastegate" for centrifugal supercharger
"wastegate" for centrifugal supercharger
(OP)
assume i want 9psi boost..i have a centrifugal supercharger...it puts out 9psi but i want it at a lower rpm..so i put on a smaller pulley...does the job..however at the higher rpms it produces too much boost...is there a way to blow off the extra boost?...similarly to what a wastegate functionally does on the turbine side of a turbo?...





RE: "wastegate" for centrifugal supercharger
The big disadvantage with centrifugal blowers is the exponential boost to rpm nature.
You could vent the manifold to atmosphere, but you would create quite a gale and waste a lot of power driving it. I expect it might also be quite noisy.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: "wastegate" for centrifugal supercharger
One question, is your compressor rated for the new maximum rpm with the different pully?
RE: "wastegate" for centrifugal supercharger
RE: "wastegate" for centrifugal supercharger
RE: "wastegate" for centrifugal supercharger
Rod
RE: "wastegate" for centrifugal supercharger
Mike Halloran
Pembroke Pines, FL, USA
RE: "wastegate" for centrifugal supercharger
RE: "wastegate" for centrifugal supercharger
Mike Halloran
Pembroke Pines, FL, USA
RE: "wastegate" for centrifugal supercharger
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: "wastegate" for centrifugal supercharger
Friend used to run a 14psi radiator cap on his intercooler piping as a failsafe if he over boosted. Goofy but functional. You'll need something bigger. Like a "wastegate". There's no reason you can't weld a exhaust waste gate to the intake pipe and then vent. Just recirculate the vent to the intake before the SC if it's a MAF car.
RE: "wastegate" for centrifugal supercharger
There are alot of contributing factors that would need to be taken into account and how much you have budgeted for this project.
MAF or MAP
Gas or Diesel
Common Throttle body?
Flow Curve of the Compressor?
Engine Displacement?
RE: "wastegate" for centrifugal supercharger
Assuming the throttle is between the compressor and the engine a secondary throttle body mounted up stream and ultimately controlled by manifold pressure via a servo will act as a restriction to the air ingested.This will result in wire drawing and hence limit flow at higher speeds and flows.