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Old 08-31-2012, 08:14 PM   #1
sporadic
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Question 2006 Turbo Duratec 2.0 need decel/closed throttle help

Cliffs notes: need help with fueling transitions. Where do I start?

I JUST finished installing a new cossie knock-off intake manifold, 60# injectors, IAT sensor in the manifold, and water/meth injection.

OK, so I've had the Pro Racer Package for quite a while now, but am still cutting my teeth on some things. The acceleration part of the tune is by far the simplest!
What I am running into now and have before (mainly on a warm startup) is a momentary lean condition after closing the throttle. It is pretty clear there is a transition occurring where it is reading values from somewhere other than the acceleration tables (MTF, BFT, etc).
My idle is great. The idle is actually better than before with no ISC changes etc. MTF needs a bit more tweaking, but I'll get there.
Even on a hot day like today I have zero knock during accel or decel, 0psi or 11psi, so the acceleration part of my tune is at least safe.
Note: I have Coasting Fuel Shut Off disabled by setting the Min Coolant value to 250. This was an attempt to help me control these transition better.

My question is: what tables/multipliers should I be researching that have a significant but momentary (1-2 seconds) affect on my AFRs on decel?
Also, upon installing the cossie-style intake manifold I disabled set the IMRC switch to 0. Does anything else need done? The logs for IMRC_OPEN are always "0" now. I thought it would be "1".
One more question, I have 60# ford racing injectors. The first file I tried filed under Ford\Injectors\60# where WAY off. Even the pdf file on the ford racing site was incorrect! The car would run worth anything with those values. Then I noticed the minimum pulse width was WAY high (about 300% high). I tried another 60# injector file named "NEW 60# injector" and it works fantastic. I'm not sure if the values are 100% accurate, but it's far better. If anyone knows for certain what value file to use for the ford racing 60# please let me know.

I don't want to come off as a complete noob. The main problem is I don't tweak my tune but every couple years, at which point I manage to forget everything I learned.

I will be continuing to research, and if I find my answer before someone replies I'll post up.


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Old 08-31-2012, 09:41 PM   #2
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May I ask why you are worried about going lean after you close the throttle ? is it effecting when you get back on the throttle ?

You know you can contact me on IM about help

Tom
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Old 08-31-2012, 09:48 PM   #3
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Quote:
Originally Posted by 1turbofocus View Post
May I ask why you are worried about going lean after you close the throttle ? is it effecting when you get back on the throttle ?

You know you can contact me on IM about help

Tom
My tip-in is OK actually. It's rather annoying that the car bogs like crazy and my AFR pegs 20 when I let off the throttle. It's a general driveability issue. If I just ran the 1/4 mile or dyno this would be fine.
Yeah I know you could set me up over IM, but I figured I'd take advantage of this tuning sub-forum and share the knowledge.
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Old 09-01-2012, 08:21 AM   #4
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You have many options for turning off the fuel cut off , VS , RPM , Temp etc , you even have a timer you can set so the coasting fuel wont come on for a given time all depending on your ECU code

Have you tried any of these

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Old 09-21-2012, 09:42 PM   #5
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UPDATE

So the decreasing load and fueling issue is indeed directly related to setting the IMRC System Switch to "0".

This is what I changed (or not) in my tune to compensate for installing a new intake manifold with no flaps. You may be able to get away with leaving the spark tables alone, but personally I like to know exactly where the total spark value is coming from without guessing whether or not the PCM is actually adjusting for IMRC.

1) leave the System Switches\Scalar\IMRC Switch at "1"
2) Add the IMRC\Spark Adder to Borderline for IMRCs values to the Spark\Borderline Knock\Borderline Knock Table
3) Zero-out the IMRC\Spark Adder to Borderline for IMRCs values
4) Add the IMRC\Spark Adder to MBT Table for IMRCs values to Spark\MBT Spark\MBT Spark Table
5) Zero-out the IMRC\Spark Adder to MBT Table for IMRCs values
6) leave IMRC\IMRC Opening RPM as-is. This seems to no longer have an effect, as the "imrc open" flag is always "1" now in the logs, even at idle.

There are some tables under "Transient Fuel" which I did not touch.
I will update this thread if I feel there is anything else to add.

In closing, I will say that I DO NOT KNOW exactly why the PCM 1) negates the load calculation at the IMRC Open RPM position and 2) pulls fuel like crazy by setting the IMRC Switch to "0". Until I hear an explanation I am going to assume it is a bug in the SCT software.
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