A way to reduce boost without pulley change?
04-07-2005 | 12:47 PM
#31
Registered User
Joined: Jun 2004
Posts: 840
From: bakersfield ca.
Re: A way to reduce boost without pulley change?
PONYHNTR, i just read your last paragraph again.
are you saying that your are using more power from your motor to run the higher blower speed with the smaller pulley that should make more boost? parasite drag on your engine?
yeah i can see that. but think of this, if the blower is incurring less resistance/boost, then it will take less power to drive the impeller....
are you saying that your are using more power from your motor to run the higher blower speed with the smaller pulley that should make more boost? parasite drag on your engine?
yeah i can see that. but think of this, if the blower is incurring less resistance/boost, then it will take less power to drive the impeller....
04-07-2005 | 01:31 PM
#32
Registered User
Joined: Feb 2001
Posts: 946
From: Lees Summit, MO
Re: A way to reduce boost without pulley change?
Originally Posted by ss#1230
maybe someone else who agrees with your theory can explain it better, because what you said doesnt make any sense.
the supercharger doesnt expect to make any boost at all. and it surely doesnt know what YOU expect it to make.
boost pressure is a byproduct of the resistance of the blower's airflow from the motor etc...
if your saying that there will be less stress with a larger pulley because the rpm of the blowers impeller is reduced then you are correct. but i dont think that the blower he owns has any problems at the rpms it is running now. the lowest advertised ATI blower is 8psi. im sure his blower can easily make over 20psi when pullied to do so.
slim doesnt want to fork out a bunch of cash to reduce the boost so we are throwing out ideas for him to relieve excess boost.
releasing boost to the atmosphere will not cause anymore stress on the blower. it will not be working any harder. the blower rpm is directly related to the engine rpm. reguardless of how much boost (resistance) you will see on your boost gauge, with the same pulleys the blower will be "working" the same amount.
its like this, the blower creates a certain amount of air flow at a certain rpm. resistance creates pressure on the discharge side of the blower. bleeding off air doesnt change how much flow the blower is putting out, it just changes where the air is going.....into the motor or into the atmosphere...
the supercharger doesnt expect to make any boost at all. and it surely doesnt know what YOU expect it to make.
boost pressure is a byproduct of the resistance of the blower's airflow from the motor etc...
if your saying that there will be less stress with a larger pulley because the rpm of the blowers impeller is reduced then you are correct. but i dont think that the blower he owns has any problems at the rpms it is running now. the lowest advertised ATI blower is 8psi. im sure his blower can easily make over 20psi when pullied to do so.
slim doesnt want to fork out a bunch of cash to reduce the boost so we are throwing out ideas for him to relieve excess boost.
releasing boost to the atmosphere will not cause anymore stress on the blower. it will not be working any harder. the blower rpm is directly related to the engine rpm. reguardless of how much boost (resistance) you will see on your boost gauge, with the same pulleys the blower will be "working" the same amount.
its like this, the blower creates a certain amount of air flow at a certain rpm. resistance creates pressure on the discharge side of the blower. bleeding off air doesnt change how much flow the blower is putting out, it just changes where the air is going.....into the motor or into the atmosphere...
I'm not one to argue, so I'm going to leave it at that. I know it's hard to believe, but trust me!
04-07-2005 | 10:53 PM
#33
Registered User
Joined: Jun 2004
Posts: 840
From: bakersfield ca.
Re: A way to reduce boost without pulley change?
i agree that the most effecient way to make the boost you want is to pulley it accordingly. but my case (and slim doesnt want to spend the $$ to do so), there is no way to reduce the boost level unless i have a larger SC pulley custom made to reduce the impellar speed.
so im simply letting some of the boost pressure escape. and my V-2 doesnt have any problem with the low impellar speed that it is set at to begin with (6.66crank & 3.33sc). it is advertised to make up to 20psi. so im not worried about "wearing it out" enough to spend the money on a pulley to drop the psi by 1-2.
hope i didnt seem like i was attacking your post. im not an authority by any means on this stuff. i usually just as lost as anyone else on here. i think that you just werent able to explain what you were thinking. i think i understand the point you were trying to make.
so im simply letting some of the boost pressure escape. and my V-2 doesnt have any problem with the low impellar speed that it is set at to begin with (6.66crank & 3.33sc). it is advertised to make up to 20psi. so im not worried about "wearing it out" enough to spend the money on a pulley to drop the psi by 1-2.
hope i didnt seem like i was attacking your post. im not an authority by any means on this stuff. i usually just as lost as anyone else on here. i think that you just werent able to explain what you were thinking. i think i understand the point you were trying to make.
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