What to the super chargers hold boost at................

Ive got an idea but need some answers

 

dont know

 

cheers bro

 

standard, 8-9 psi

 

Are they like small policemen

 

are they a good unit to start with.

have you known the casings to crack

 

I take it you mean the super charger casing?, no I haven't

 

yes sorry i mean the super charger casing.

well no cracking thats a good start.

last question

is the charger unit a small size or is a fairly big ??



cheers for your help bro

 

This might help, these pictures are of an Aston Martin supercharger against a mini supercharger - mini's the smaller one

 

well spotted

 

Just what I was after all my questions answered.

Thank you Graham for your answers

 

no worries - anytime

 

I now have a brand new one in my garage that I got for nothing, good job my mate works for bmw as a tech

 

Standard units are good for 18-19 psi and no more

 

Thats more then enough for me bro

 

hmm theft

I got 4... legally of course!

Alex

 

PMSL

 

Its an Eaton M45, an off the shelf supercharger, easy to find info.

Its NOT about boost pressure though.

Its about RPM.

At the same rpm on one engine it could give 50psi, on the other it might not give any.
And trying to get the same boost on a different engine would mean changing pulley ratios and overspeeding it like a mutherfucker.

But yeah, you can get about 19psi on a standardish flowing CooperS lump, but even that is well over the allegedly safe (according to eaton) RPM level of the charger.

Ive got one at home.

 

What Steve has said is totally correct (not that you'd doubt him) You need to work out the VE of the engine your using (once modified with head cams etc) and then compare it the the mini engine at similar rpm values, You've already mentioned you want a zetec to rev past 8k so this need to be to in to account if the supercharger is to shit its self at 16.000rpm

 

I meant supercharger RPM danny, not engine rpm, though that needs taking into account obv.

And yes, the VE etc part is the main issue, and then from there you need to work out the pulley ratio and so on.

 

Cheers for your info bro

Im sure we can sort any prblems we come across