BLM question Park vs. Drive
09-17-2009, 10:28 PM
#3
Registered User
Join Date: Jul 2002
Location: Phoenix, AZ
Posts: 1,277
We need to know more about your setup to get into specifics.
It is the same for me. When you have all of your idle air going through the IAC and idle plenum, the air is controlled better at each individual cylinder. This is what happens in park and no throttle if your blades are set up to be completely closed.
Now you give it some gas and air goes through the TB blades, it cannot be so easily controlled at part throttle to go to each cylinder evenly. The vacuum causes this. The larger the cam (reversion back into the intake plenum) the larger the split.
At WOT, you have atmospheric or close to atmospheric conditions so again this issue with split BLM's goes away.
Ben
It is the same for me. When you have all of your idle air going through the IAC and idle plenum, the air is controlled better at each individual cylinder. This is what happens in park and no throttle if your blades are set up to be completely closed.
Now you give it some gas and air goes through the TB blades, it cannot be so easily controlled at part throttle to go to each cylinder evenly. The vacuum causes this. The larger the cam (reversion back into the intake plenum) the larger the split.
At WOT, you have atmospheric or close to atmospheric conditions so again this issue with split BLM's goes away.
Ben
Last edited by 95Blackhawk; 09-17-2009 at 10:31 PM.
09-18-2009, 07:55 AM
#4
Registered User
Thread Starter
Join Date: Aug 2007
Posts: 124
We need to know more about your setup to get into specifics.
It is the same for me. When you have all of your idle air going through the IAC and idle plenum, the air is controlled better at each individual cylinder. This is what happens in park and no throttle if your blades are set up to be completely closed.
Now you give it some gas and air goes through the TB blades, it cannot be so easily controlled at part throttle to go to each cylinder evenly. The vacuum causes this. The larger the cam (reversion back into the intake plenum) the larger the split.
At WOT, you have atmospheric or close to atmospheric conditions so again this issue with split BLM's goes away.
Ben
It is the same for me. When you have all of your idle air going through the IAC and idle plenum, the air is controlled better at each individual cylinder. This is what happens in park and no throttle if your blades are set up to be completely closed.
Now you give it some gas and air goes through the TB blades, it cannot be so easily controlled at part throttle to go to each cylinder evenly. The vacuum causes this. The larger the cam (reversion back into the intake plenum) the larger the split.
At WOT, you have atmospheric or close to atmospheric conditions so again this issue with split BLM's goes away.
Ben
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