Motor Comp. vs supercharged PSI
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 1,014
Likes: 7
From: Ft Wayne IN
Motor Comp. vs supercharged PSI
I built my 383 for good compression but know I feel the itch for more HP. I think the only way to get 50-75hp more would be a supercharger? Other than some exotic heads I don't think any motor parts will get me close and still be streetable.
My problem is my motor was built with 11:1 comp. (on paper) do to pistons and 52cc heads. My higher duration cam will bleed off some.
My question is what compression do I need to be at for a mild supercharger?
My problem is my motor was built with 11:1 comp. (on paper) do to pistons and 52cc heads. My higher duration cam will bleed off some.
My question is what compression do I need to be at for a mild supercharger?
Race Director
Joined: Sep 2001
Posts: 14,679
Likes: 752
From: NEwhere Ohio
May want to consider nitrous, if your only goal is better et's.
Be aware of the following limitations with nitrous
a. the initial 'hit' punch quickly drops off as rpms build
b. a half full bottle will provide less HP/TQ than a full bottle...EVEN WHEN USING A BOTTLE HEATER TO SPRAY AT THE SAME PSI.
c. I want 100% of that power to be there all the time. Not just when I have a full bottle and have the bottle opened.
Sorry about the caps (i know some people dont like it), but i want to emphasize that. Its for those 3 reasons that I got rid of the nitrous and am supercharged
Ive been through nitrous / done that and am happiest with a supercharger.
If you want street performance thats always there 100% of the time:
Go FI. A centrifugal with a big pulley (to limit your boost to 5/6 psi or so maximum) AND methanol injection (to cool the charge) is your ticket. Id refer you to greg at blowerworks for c4 applications.
All this said, I ran my fastest time w/ nitrous. I have yet to run my latest supercharged setup.
Be aware of the following limitations with nitrous
a. the initial 'hit' punch quickly drops off as rpms build
b. a half full bottle will provide less HP/TQ than a full bottle...EVEN WHEN USING A BOTTLE HEATER TO SPRAY AT THE SAME PSI.
c. I want 100% of that power to be there all the time. Not just when I have a full bottle and have the bottle opened.
Sorry about the caps (i know some people dont like it), but i want to emphasize that. Its for those 3 reasons that I got rid of the nitrous and am supercharged
Ive been through nitrous / done that and am happiest with a supercharger.
If you want street performance thats always there 100% of the time:
Go FI. A centrifugal with a big pulley (to limit your boost to 5/6 psi or so maximum) AND methanol injection (to cool the charge) is your ticket. Id refer you to greg at blowerworks for c4 applications.
All this said, I ran my fastest time w/ nitrous. I have yet to run my latest supercharged setup.
