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Barra/Patrol Idle dropping low and stalling


XR85
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Hi

GU patrol Ute with a BF n/a Barra engine with fog plenum and throttle body with bf pedal.

I have an issue with a converted Barra patrol idling very low and stalling on decel or stumbling at idle before a second later idles fine with no issues. I have attempted several times over many days to rectify this problem with no hope in sight.

Hoping some of you out there may have some ideas for me!

I have swapped the map sensor to be the bf one, lifted and reduced scalars in idle section, increased battery voltage, increased and reduced scalars in dashpot etc.

As you can see I am flying blind and don’t seem to be able to figure it out on my own.

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24 minutes ago, XR85 said:

Hi

GU patrol Ute with a BF n/a Barra engine with fog plenum and throttle body with bf pedal.

I have an issue with a converted Barra patrol idling very low and stalling on decel or stumbling at idle before a second later idles fine with no issues. I have attempted several times over many days to rectify this problem with no hope in sight.

Hoping some of you out there may have some ideas for me!

I have swapped the map sensor to be the bf one, lifted and reduced scalars in idle section, increased battery voltage, increased and reduced scalars in dashpot etc.

As you can see I am flying blind and don’t seem to be able to figure it out on my own.

It might pay to revert back to stock & start again after reading some useful info provided by @BeerTurbo
 

 

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3 hours ago, XR85 said:

Thanks Bill

Tried the items and more from beer turbo with no change! Any ideas?

I assume you've checked that you don't have any mechanical issues, throttle body is clean & isn't restricted in any way and you don't have any fault codes. 
Does it have the problem when hot, cold or both? 

I haven't done the conversion but have seen several people complain about an idle issue & they fixed it by drilling a hole in the throttle body to increase the idle airflow. Have you searched "idle airflow"? There's differences in these tables that may help if you haven't already tried them.
Comparing auF0030 & auF0032 in a BF turbo file vs FG turbo, 
auF0030 Aircharge in lb/min at idle speed P/N
FG is 0.36@700rpm & BF is 0.65
FG is 0.4@800rpm & BF is 0.74
FG is 0.52@900rpm & BF is 0.88
This is just a sample from the auF0030 & you'll see similar differences when you start looking at auF0032 Aircharge in lb/min at idle speed in gear. 
I haven't looked at the adders but there may be differences there too.

Let us know how you go.

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I played with a lot of variations to make my r31 idle.

Basically everything in drive by wire and pedal are left to the BF configuration. 

 

check:

AUF0082 - i have mine set to a FG NA configuration.  the feed forward request throttle is more in the low load areas on the FG param. (more throttle angle at idle)

 

the idle airflow in p/n i have stock... but you need to watch out the fg ones are lower values so dont use them if your having trouble. there also differences across the turbo/na/allsorts of same model car

 

Now you can bump these number up if your having issues , they only then relate back to the feedforward throttle angle table and pump up the idle. 

 

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