Powerdyne Supercharger Spool

[M3SCharged]

hi, I am not sure if this would relate to any kind of Supercharger, but mine starts to get the "true" hard pull boost at around 4300RPMs, how come not sooner? Is there anything I can change/add/fix to spool quicker?

Current Engine Mods:

Rebuilt motor (JE 9.5:1 pistons, AA Head gasget, balanced, 20 over, plus more)
RMS racing head (3.2 valves, stronger springs, retainers, 3angle valve)
RMS 36lb injectors
RMS cams (264/256)
Powerdyne based 9lb supercharger based on dinan kit)
9lb pulley
Euro 3.5" HFM
UUC Twin Silencer Exhaust
UUC lightweigh flywheel
Sach HD clutch

Thanks for any input.

[stimpee]

No, you cannot get more sooner, unless you remove it and put on a turbo or twin screw.

It is the nature of the centrifugal compressor. Makes boost as a function of rpm squared. You will not see more than about 1-2 psi of boost below 4000rpm no matter what you do

Steve

[QuiickSilver]

is that auburn washington?

[tophermack]

stimpee: what supercharger do you have? i have been thinking of F/I and want a twin screw s/c any one better than the rest?

[@bgynite@]

actualy i make 4 psi at 3k but i am also running 15 psi at redline so go figure.

if you want more power go with a xb1a gear driven powerdyne s/cer thats what i have and im lov en it.
they are good for 18 psi on a mustang engine which is about 21 psi on an e36 motor for the same impeller speed. You just have to get a tec 3 and lower that compression a shit load.

[stimpee]

Originally Posted by @bgynite@

actualy i make 4 psi at 3k but i am also running 15 psi at redline so go figure.

if you want more power go with a xb1a gear driven powerdyne s/cer thats what i have and im lov en it.
they are good for 18 psi on a mustang engine which is about 21 psi on an e36 motor for the same impeller speed. You just have to get a tec 3 and lower that compression a shit load.

OK, so double the redline boost, and you double the low end boost.

If I set the twin screw to deliver 15psi at redline, I would have 13+ psi at 3k rpm.



tophermack, I am running the Active Autowerke Twin Screw kit (stage II+ in my case) on my 97 M3/4.

I designed the hardware for the kit, and worked with Active to bring it to production.