High Idle mod question

Reply Subscribe

Thread Tools

Search this Thread

Mar 14, 2011 | 11:03 PM

smokersteve

Thread Starter

Posting Guru

Joined: Nov 2008

Posts: 1,458

Likes: 2

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

Mar 14, 2011 | 11:11 PM

XB70

Elder User

Joined: Feb 2011

Posts: 564

Likes: 0

By "high idle mod," do mean SEIC or BCP or some home made circuit? Since SEIC and BCP are factory programed up idle circuits, I wouldn't call either a high idle "mod."

Mar 15, 2011 | 04:05 PM

bpounds

Hotshot

Joined: Aug 2006

Posts: 17,398

Likes: 317

From: Whittier, CA

Quote:

Originally Posted by smokersteve

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...

How much boost pressure? You should have nearly zero boost when in park, regardless of RPM.

Mar 15, 2011 | 04:15 PM

smokersteve

Thread Starter

Posting Guru

Joined: Nov 2008

Posts: 1,458

Likes: 2

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.

Mar 15, 2011 | 04:28 PM

bpounds

Hotshot

Joined: Aug 2006

Posts: 17,398

Likes: 317

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.