High Idle mod question
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Posting Guru
Joined: Nov 2008
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From: CA Sacramento
High Idle mod question
In park I noticed that when HIM is on I have more boost pressure than when I (HIM off) put the throttle at 1,200 rpm... And when I have my foot at 1,200 rpm and then put HIM on, the rpms drop. Another situation I had HIM on with my foot holding the eng at 1,400 rpm and then turned HIM off and the rpms when up.
Is this because of the turbo boosting? and/or is there more going on?
Thanks
Is this because of the turbo boosting? and/or is there more going on?
Thanks
Hotshot
Joined: Aug 2006
Posts: 17,400
Likes: 319
From: Whittier, CA
How much boost pressure? You should have nearly zero boost when in park, regardless of RPM.
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Posting Guru
Joined: Nov 2008
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From: CA Sacramento
it is less than one pis. it jumps between .5 and .7 acording to the insight.
HIM on it will be ~2psi and if I give it throttle to go up to 2,000 rpm it will be ~ 4psi. then if I turn HIM off and go through the rpms the highest I will see is ~1.5psi.
HIM on it will be ~2psi and if I give it throttle to go up to 2,000 rpm it will be ~ 4psi. then if I turn HIM off and go through the rpms the highest I will see is ~1.5psi.
Hotshot
Joined: Aug 2006
Posts: 17,400
Likes: 319
From: Whittier, CA
I wonder if you did the SEIC or the BCP? Just guessing here, but with SEIC it locks the torque converter and is designed to provide power to a take-off device. That would require some boost. With BCP it is just idle to drive the alternator. No boost needed. Other than that, I cannot explain the behavior you are seeing.
Thread Starter
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Posting Guru
Joined: Nov 2008
Posts: 1,458
Likes: 2
From: CA Sacramento
I wonder if you did the SEIC or the BCP? Just guessing here, but with SEIC it locks the torque converter and is designed to provide power to a take-off device. That would require some boost. With BCP it is just idle to drive the alternator. No boost needed. Other than that, I cannot explain the behavior you are seeing.
What are the wire colors? pics?
Hotshot
Joined: Aug 2006
Posts: 17,400
Likes: 319
From: Whittier, CA
BCP = Purple/Green Stripe
SEIC = Solid Orange
from here:
http://www.thedieselstop.com/content...%20High%20Idle
SEIC = Solid Orange
from here:
http://www.thedieselstop.com/content...%20High%20Idle
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