Now I think I'm high from breathing exhaust fumes while logging the truck at idle

Tee hee!


Ow, my head hurts

 

Schweet!!

Got my avg RAFIG down to like 0.06 g/sec and my avg RAFPN to 0 exactly after idling for 4-5 minutes each in park and in gear. Drives like a charm now! They were both maxed at 1.50 when I started, hence my problems.

Idle is set at 725 RPM. I get a slight drop when I shift from P to D since it kicks into gear right away, no drop when I go from P to R because there is the 1-second delay before it drops into gear and the IAC has time to compensate.

The bouncing RPM when coasting slow in N is gone too. Sticks right around 725.

 

i saw your other post saying you got it going. glad to hear you got it worked out. BTW, what did you wind up with for your P/N and Gear values?

 

LABELS Desired Airflow (Grams/Second)
ECT °F {link: SAE.ECT} In Gear Park/Neutral
-40 18.500000 15.877930
-18 17.599609 15.093750
3 16.349609 13.917969
25 14.900391 12.447266
46 14.728936 10.977539
68 14.557482 9.653320
90 14.386028 9.506836
111 14.214574 9.391338
133 13.951785 9.245690
154 13.688996 9.100043
176 13.492667 8.644117
198 12.713885 7.889155
219 12.713885 7.889155
241 12.713885 7.889155
262 13.492667 8.295596
284 14.271448 8.701038

 

RAF looks good and is really not to far off from a truck I was working with close to the same setup. Had some bad cruise affect off idle and around 20mph after RAF. Have a fix if your doing the same.

 

Explain cruise effect....not sure what you're talking about.

I found out tonight that it makes a HUGE difference if you are doing your idle logging with the headlights on or off.....I guess loading up the alt a little bit really changes idle. I finally got it straightened out, but I go from -0.40 g/sec P/N headlights off to 0.40 HL on, and -0.60 g/sec IG HL off, 0.60 IG HL on.

New values:

LABELS Desired Airflow (Grams/Second)
ECT °F {link: SAE.ECT} In Gear Park/Neutral
-40 18.500000 15.877930
-18 17.599609 15.093750
3 16.349609 13.917969
25 14.900391 12.447266
46 14.728936 10.977539
68 14.557482 9.653320
90 14.386028 9.506836
111 14.365078 9.391338
133 14.344127 9.245690
154 14.323177 9.030048
176 14.302227 8.814406
198 13.476719 8.044571
219 13.476719 8.044571
241 13.476719 8.044571
262 14.302227 8.459019
284 15.127734 8.872449

 

What I ment by cruise effect... Low speed cruise... Or better yet put it in drive and take your foot on the brake on a straight road, You should not be hitting 25-30 mph. Not saying you are but I had issues with a simialr set up.

 

Oh gotcha..I'll have to try it and see what happens.

 

Hey Thunder,
When I get back in the USA, I would like to get a copy of your tune to compare to mine. I am still having the same issues of rpm jumping between P/N P/D etc...but it idles ok, even with the AC on.
Chris

 

That would be these tables for you. Min would idle fine once it bounced around for a little bit. Tweaking these tables helped stop the jumping around. Lemme know when you get back and I'll send my tune over.