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  1. #1
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    Has anyone tried raising the idle rev speed to combat SMFW chatter?

    Have any of you used INPA to do this? and if so, did it actually help at all?
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  2. #2
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    I have asked the same question before but got no response. One person said the max they could raise it was only to like 750. I think it would need to be at 900-1000k idle to eliminate it completely.
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  3. #3
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    I did. You have three different settings for idle rate that can all be raised a hair under what you actually need. Doesn't help 100% maybe 70%.
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  4. #4
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    any little bit helps, i may have to do this... i've had enough of the noise
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  5. #5
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    Have you tried throwing a bunch of marshmellows into the transmission fluid. I heard that can work.
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    If it's really bothering you, change to a heavier flywheel.

    Raising the idle is a bit of a kludge, plus you''ll likely have accelerated clutch wear

    Neil

  7. #7
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    I'll probably end up with the steel one i guess
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    I have spec2+ and SS SMFW. Before I purchased this combo, I was super reluctant to get an SMFW due to all the forums posts I read. I drive my car daily and take clients out for lunch , dinner etc. Because of the new turbos, I was advised to go with the SMFW option. After the install, my installer cranked up the car and I asked him when would I hear the noise, he told me that "this is it!". So, the noise is nowhere near what I was expecting. Yes, it is certainly noisier than the OEM setup but at the same time I knew that I had to compromise a little bit for this type of power. The noise-rattle does go up, when the A/C is on. I am not knowledgeable enough to know if there is a noise difference between SS and Aluminum units but my set up is certainly not that noisy.
    Spec2+ Clutch, SS SMFW, BMS backend flash, VRSF DPs, ETS 5" FMIC, ER CP - Tial BOV, N20 3.5 Bar map sensor, BMS OCC, Walbro 255, Wavetrac LSD, Defiv Diff. lockdown kit, UUC EVO3 and DSSR, AFE DCI, H&R Coilovers, M3 Front control arms, rear arms, rear subframe bushings, Rogue Engineering transmission mounts, Michelin PSS 265/35/18 - 235/40/18, Apex ARC-8.

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    I raised it to 800-850 (max I could). Posted how sometime ago ago, but unfortunately don't remember the specifics. It's through INPA, but not the obvious menu option as this is for testing... resets when cars off. There's 3 or 4 settings that use values from 0-250 IIRC. You'll find it if you search the menu options.

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    Click here to enlarge Originally Posted by JoshBoody Click here to enlarge
    I raised it to 800-850 (max I could). Posted how sometime ago ago, but unfortunately don't remember the specifics. It's through INPA, but not the obvious menu option as this is for testing... resets when cars off. There's 3 or 4 settings that use values from 0-250 IIRC. You'll find it if you search the menu options.
    So there is no way to permanently raise the idle then? and the max was 8-850?
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    2 out of 2 members liked this post. Reputation: Yes | No
    Yes you can adjust permanently, but the seemingly obvious menu screen is just for temperary testing.

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    @JoshBoody so the INPA screen doesn't do what's advertised?

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    Click here to enlarge Originally Posted by Tzu Click here to enlarge
    @JoshBoody so the INPA screen doesn't do what's advertised?
    theres 2 screens. 1 you can directly enter an rpm, but it resets when cars off. The 2nd permenently changes idle speed, but not obvious (i have German version). The adjustment values do not directly translate to an rpm change, so i tried various and max i could change was around 800-850. IIRC the values may have been 0-250 which could be the rpm added, but its been awhile.

    The vid above is private.

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    Click here to enlarge Originally Posted by onebadmofo Click here to enlarge
    I made a video back in a day.
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    Video says its private.
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  16. #16
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    I'm just going to get a steel flywheel this time around and some thicker fluid
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    Click here to enlarge Originally Posted by jpsimon Click here to enlarge
    I'm just going to get a steel flywheel this time around and some thicker fluid
    If you don't want the aluminum smf ill take it...

  18. #18
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    INPA is mostly for diagnostics and troubleshooting. It gives you the ability to manually perform certain type of actions that the ECU will perform under certain conditions. Those are called "activations". For an example: you can "activate" the coolant pump with output of 20% and keep increasing it all the way till 80%. The idea is to test the electric motor of the coolant pump while the engine is off.

    Same thing with the idle activations. The ECU has a built in logic where it will increase the idle speed depending on whether the oil is cold, whether the AC is on, whether the battery is discharging or whether "rough running" is detected in any of the cylinders. INPA allows you to test all those conditions manually, without actually having to wait for them to occur on their own.

    Changing the idle permanently involves recoding. INPA may have a feature like that hidden somewhere, but you are more likely to find it hidden inside the ECU maps. Those are the default parameters built into the firmware that the ECU loads and runs with.

    I think the guys at Cobb may have stumbled upon these at some point during their development.
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    Click here to enlarge Originally Posted by jpsimon Click here to enlarge
    I'm just going to get a steel flywheel this time around and some thicker fluid
    The steel one still rattles, but from what I hear, not as loudly as the aluminum fw
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  20. #20
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    @jpsimon the aluminum is that bad eh?

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