EFIDynoTuning Forum

Thanks,that got me back on track.
If I want to drop my idle desired idle down to say 800rpm, can I just change that (nubase?), reset my throttle stop to get proper ISC DTY, and redo my dashpot? Or do I need to go through all the steps in the Idle writeup? It’s currently a little high at 1024 rpm.

is that called something different under the parameter tree? i expanded every friggin + sign and i’m not seeing it.

Thanks for the tips. I tried using some of the default settings from the Dashpot write up. All rpms below 3500 set at 0.0 and 3500 up at 2.0. Been playing with the decay settings, but keep getting the hang at around 1600 still. When this happens, the Dashpot gauge on the dashboard sticks at .5000 and stays there until rpms finally drop down. ISC DTY sticks at .51 when this happens
I'll play with more extreme decay settings but I have a feeling it's something unrelated to dashpot.

Thanks.
Anyone have an idea as to what cell I would adjust in the Decay table to stop the 1600rpm hang. Do I simply see what my Dashpot gauge reads when logging, and adjust at that Dashpot on the table? When logging I often see Dashpot sitting at .5000. Is that it clipping at that RPM?.......It seems to coincide with ISC DC reading .51.

Back again. Playing around with dashpot. With my old foxbody strategy it seems there are really only 2 tables to play with
1 The dashpot airmass clip lbs/min at RPM and
2 decay dashpot at airmass lbs/min
I think I'm missing some math here and honestly I don't completely understand this.

Seeing as I can't really screw anything up too bad playing with only these 2 tables I did some experimenting. Lowering my airmass at lower RPMs got rid of the sucking sound from the IAC and got rid of my cruise control at pretty much all speeds. I still get a little bit of a hang at around 1600rpm.
I keep raising the airmass at lower dashpot settings in the decay table but I still get a slight hang there.
I've attach a short log and a screenshot of my decay and airmass clip tables, if anyone has time to explain what I'm doing wrong.
Thanks

eta: also, does “emulation” mean I can make changes while the car is running? Do I need to do anything other than enable emulation or do I have to hit the up arrow after a change? I’ve just been doing it a bin at a time and if there’s an easier way, all the better.

Thank you both.
That’s a huge help. Lots to take in.
Will keep reading.

Ok, next round of questions. From the Dashpot writeup:

SURGING IDLE - PRACTICAL EXAMPLE

Lets say your idle is screwed and you just can't seem to get it tame enough for the ECU to control the ISC correctly. You may have to temporarily crack open the throttle blade to get the idle tame and do the following:

Get her up to warm idle (180-200*F ECT), once shes been idling at normal operating temp for 5 minutes take note of the ACTUAL
RPM
MAF
ISCDC
IPSIBR
ISCKAM2

let the idle settle and watch ipsibr and isckam2 they should both be working their way towards 0.000

add them both together, if their sum is +/- 0.05 then call it good and never look back

otherwise if their sum (ipsibr+isckam2) is greater than 0.05, then you need to open the throttle stop a little bit (1/4 turn)

If their sum is less than -0.05 then you need to close the throttle body stop a little bit (1/4 turn)

Has IPSIBR and ISCKAM2 been given different names? I don’t have them on my dashboard and don’t see them listed in the “Edit Gauges”.

Just trying to understand a few easy things first.


Also, going back to fuelling, here are a couple of screen shots. One shows KAMRF in the .700's. So, if I understand this right, I'm in closed loop, so HEGO's are monitoring the AFR in the exhaust pipe, the ECU is asking for a LAMBSE of whatever is entered in the MAF table(yes?) and the KAMRF’s are making the correction to reach the targeted LAMBSE. Is that right?
What is making the KAMRF think it needs that much fuel removed when LAMBSE is currently showing close to 1.0. That's where you want LAMBSE and KAMRF to stick around.....is that correct?

In the other screenshot it shows LAMBSE at around 1.200 with KAMRF providing virtually no correction. What is going on there that makes KAMRF not add fuel to fix it?
Incidentally, both instances happen at about 300 IMAF.
Just not sure if I'm seeing something off, or if all is good.

Thanks for the explanation.

Thanks.....yeah that makes sense about the ISC.....it’s a main component of dashpot control.

Still a little foggy on the fuelling. The Lambse is what the ecu is commanding. Based on what? Is that a number calculated by the tuner and input into a fuel table or maf count table? Must be based on the adcounts requested during initial tuning, right?
Kamfr is what’s really happening with fuel, based on info from the hego?
From what I’m reading, lambse and kamfr should be pretty close to 1.00 if fuel is right. If kamfr is reading in the .700 range does that indicate simply that fuelling is rich, or that it is adding fuel? And what would be the cause of the kamfr reading in that range?
See....still pretty foggy, but picking away at it.
Thanks.

Decipha, I'm just posting this here so other people can relieve you of answering my stupid beginner questions. I know you're busy and I don't want to bogart your time until it's necessary, like when I need my tune updated.

I'm a Premium member, and Decipha has done a great job getting my tune close to where I want it.

Where should the ISCDTY sit while driving? I'm slowly getting the throttle stop so it sits at around .15 at warm stable idle but when driving it often sits at around .75. Maybe I'm not understanding the function of the ISC, but when driving, shouldn't the ISC essentially be off since the throttle body is controlling the air intake at that point. ie if driving around and using the pedal, why would the ISC need to contribute air?
I didn't see this mentioned in the write ups, so thought I'd ask here.

Also, I'm a little lost on the LAMBSE and KAMFR. KAMFR is long term fuel trims (which I don't really understand either) ? I notice in a log I took tonight that sometimes my KAMFR reads in the .700's and turns orange while driving in slow cruise. Is that showing a lean or rich condition? It coincides with a slight hesitation or buck at those slow speeds.

Grateful for any explanations.
Cheers. Brad