Lumpy Idle after IOP,IRL changes -> KFMI

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Topic: Lumpy Idle after IOP,IRL changes -> KFMI_UM? (Read 17992 times)

ddillenger

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	Re: Lumpy Idle after IOP,IRL changes -> KFMI_UM? « Reply #15 on: April 29, 2013, 05:48:04 PM »

I've had some good results bumping the pressure up with the 630s, seems to smooth things out a bit. If you've seen used dekas on a flowbench, you'll understand they dribble more than they spray. More pressure seems to be a bandaid.


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nyet

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	Re: Lumpy Idle after IOP,IRL changes -> KFMI_UM? « Reply #16 on: April 29, 2013, 05:49:21 PM »

Quote from: ddillenger on April 29, 2013, 05:48:04 PM

I think the problem is exacerbated by heat as well, which is why they idle WORSE after the motor is warmed up...


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catbed

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	Re: Lumpy Idle after IOP,IRL changes -> KFMI_UM? « Reply #17 on: April 29, 2013, 05:52:52 PM »

Quote from: nyet on April 29, 2013, 05:38:46 PM

i assume your idle trims are stable throughout the warmup cycle, all the way through normal engine temps?

If not, maybe take a peek at KFFWL and try to get them stable? perhaps wall wetting tables as well?

the dekas just suck IMO. some batches just won't seem to idle right, no matter what you do.

Or, maybe we're all just missing something.

Yup, idle trims are within 3%. My next train of thought was indeed wall wetting, as I know these injectors are crap.

dd, I do have a 4bar FPR I can throw in. That was on my list to do before getting new injectors. I think ID1000s or EV14 biguns are my choice.

EDIT: I still think it could be a software issue. It idled fine on my OTS Uni tune that I ran up until a couple weeks ago.


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phila_dot

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	Re: Lumpy Idle after IOP,IRL changes -> KFMI_UM? « Reply #18 on: April 29, 2013, 06:08:04 PM »

What does wall wetting have to do with idle?


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nyet

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	Re: Lumpy Idle after IOP,IRL changes -> KFMI_UM? « Reply #19 on: April 29, 2013, 06:54:30 PM »

I thought wall wetting sometimes throws closed loop fueling off as the ecu adds/removes fuel, delaying the adjustment's effect and inducing wide swings in trims.

but that is just regurgitating somebody else told me a long time ago. Perhaps it was bs?


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catbed

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	Re: Lumpy Idle after IOP,IRL changes -> KFMI_UM? « Reply #20 on: April 29, 2013, 07:24:47 PM »

Wall wetting was just an idea. Haven't delved into the FR about it yet though.


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phila_dot

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	Re: Lumpy Idle after IOP,IRL changes -> KFMI_UM? « Reply #21 on: April 29, 2013, 08:34:30 PM »

The idea is to maintain target lambda during load changes.

If wall wetting is causing problems at idle, then the injector calibration is off elsewhere and tmot based changes in wall wetting is exposing it.


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catbed

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	Re: Lumpy Idle after IOP,IRL changes -> KFMI_UM? « Reply #22 on: April 30, 2013, 01:02:07 PM »

Any other ideas besides bumping up fuel pressure? Like I said it idled fine with my OTS Uni tune that I was running until a few weeks ago.


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