Supercharged m50 b30 throttle placement

Discuss general engine, turbo and supercharger conversions in this section

Moderator: martauto

User avatar
dicko
E30 Zone Regular
E30 Zone Regular
Posts: 342
Joined: Fri May 12, 2006 11:00 pm
Location: ireland

Post Sun Apr 19, 2009 9:47 pm

I am going to build a supercharged m50 with s50 b30 crank rods and pistons , I will be using a eaton m90 and I am wondering if I should put the throttle before or after the s/c , also wondering if ITBs would be a waste with the forced induction.
Also i will be fitting m20 flywheel , what clutch would all you
turdo m20 lads recomend , I am hoping for a lot of torque so will need a good clutch.
If I place the throttle after the s/c will it make it very noisy ?
appletree
E30 Zone Addict
E30 Zone Addict
Posts: 3482
Joined: Fri Jan 20, 2006 11:00 pm
Location: Retford

Post Sun Apr 19, 2009 10:25 pm

Put the throttle before the charger, on a positive displacement charger like an eaton its a pain to have it after, dump valves and snappy respose as the valves slam shut when the throttle opens.

Look at oem set ups, there all before for a reason, smoothness and quiteness if there real words :mad:
Image

You should never underestimate the predictability of stupidity

M42 Supercharged 285bhp + M3 6speed box
User avatar
dicko
E30 Zone Regular
E30 Zone Regular
Posts: 342
Joined: Fri May 12, 2006 11:00 pm
Location: ireland

Post Sun Apr 19, 2009 10:47 pm

So before the charger it is ,I will still need bypass Appletree ?
appletree
E30 Zone Addict
E30 Zone Addict
Posts: 3482
Joined: Fri Jan 20, 2006 11:00 pm
Location: Retford

Post Sun Apr 19, 2009 11:39 pm

I ran mine with out and then with a recirc bailey dump valve between the charger inlet and outlet after a few books suggested it was a good idea to run one, i thought it might dealy throttle response so didnt fit one to start with.

It did'nt realy dealy it anymore and was a bit quiter on overrun and part throttle, slightly better mpg but nothing major over not running it.
:D
Image

You should never underestimate the predictability of stupidity

M42 Supercharged 285bhp + M3 6speed box