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Engine Specific Info and Questions => IDI Engine => Topic started by: Op-Ivy on February 01, 2009, 10:30:29 pm

Title: Plastic Ring Under LDA Diaphragm
Post by: Op-Ivy on February 01, 2009, 10:30:29 pm

I noticed this plastic ring on the LDA Diaphragm pin. It seems like it is there to prevent the boost pin from going to low.

Taking it out would probably let the pin push lower thus producing more fuel at high boost. Correct?

Pic of ring:

(http://i96.photobucket.com/albums/l163/Op-Ivy/P2010001.jpg)

Title: Plastic Ring Under LDA Diaphragm
Post by: gldgti on February 01, 2009, 11:22:17 pm

thats what i thought - so i removed mine... seems that it did allow a bit more fuelling in my case.

Title: Plastic Ring Under LDA Diaphragm
Post by: Smokey Eddy on February 01, 2009, 11:24:01 pm

Hmmm
I wonder why this hasn't been mentioned till now. Smart thinking fellas.

Title: Plastic Ring Under LDA Diaphragm
Post by: Powered by Spearco on February 01, 2009, 11:28:33 pm

I think someone a while ago said that its there as kind of a bump stop, as to keep the pin from bottoming out hard when boost builds.
I've heard that you can shave down the plastic and still have a pad of some sorts and still get more boost.

Title: Plastic Ring Under LDA Diaphragm
Post by: Op-Ivy on February 01, 2009, 11:59:37 pm

Ah thanks for the input Andrew. I did this when I pulled it out by looking at the little groove that the pin has made on the boost pin. Looked alright.

Title: Plastic Ring Under LDA Diaphragm
Post by: Clintwalker85 on February 02, 2009, 12:19:39 am

would changing the boost pin to get more boost make your engine run alot higher in temp?

Title: Plastic Ring Under LDA Diaphragm
Post by: dillenger1 on February 02, 2009, 03:14:26 am

I removed mine and it isnt bottoming out.I can see the path in the grease i applied.It still stops about 6mm from the top.I think maybe the foot of the pin needs ground to.

Title: Plastic Ring Under LDA Diaphragm
Post by: Clintwalker85 on February 02, 2009, 08:46:27 am

whats a good running temp?

Title: Plastic Ring Under LDA Diaphragm
Post by: Smokey Eddy on February 02, 2009, 11:49:56 am

Quote from: "libbybapa"

The concern is EGTs (exhaust gas temperatures).  Before making adjustments to fueling an EGT gauge is required to effectively prevent engine destruction.

Andrew

Haha, Destruction. You put that nicely.