How do you calculate blower drives?

57 Magnacharger · Post by **57 Magnacharger** » Fri Jul 13, 2001 6:34 am

If you Know: eng size / blower size, can
you calculate drive ratio to give a certain boost?

57 Magnacharger · Post by **57 Magnacharger** » Sun Jul 15, 2001 5:31 am

here's a partial, possible method (maybe spark some comment). thanks to Moog
Use the specs of the blower to see what flow it gives, eg my 40ci---195 cfm at 6000 rpm
..... 450 cfm at 12000 rpm.(measured at 6lbs)
Then match to engine flow rates (this is where things get weired-- cause I cant
calculate this yet.)

I am pretty sure that trial & error will be needed in the end. So many factors will influence Boost. If I can get close it will save me time and money on set up.

moggy · Post by **moggy** » Sun Jul 29, 2001 2:16 pm

Here you go Glenn, read through this page. All the calc's you need.
http://www.gnttype.org/techarea/turbo/turboflow.html

57 Magnacharger · Post by **57 Magnacharger** » Fri Aug 03, 2001 7:02 am

Thankyou Moggy, That's answered my Question well and truely. All I have to do now is wait til I'm not so tired & try to calculate mine by these formulas.
CHEERS.! . . . Glenn.