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Thread: M156 cam timing tuning/tune limitations.

  1. #1
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    M156 cam timing tuning/tune limitations.

    2010 C63
    After receiving a great tune from MEP performance, I decided to start fresh and give it a go myself.
    Fastest time in the quarter mile using e85 is 11.94 @119mph. All season tires, no burn out, starting from idle, and an extra 400 pounds of passengers. Car drives fantastic and has all the options of all the other tunes(exhaust pops/burble, throttle blip on downshifts). Car is absolutely awesome.

    When it comes to cam timing, will the difference in tuning be able to be felt by my butt Dyno? Car has never been on a Dyno, only street tuned.

    The idle cam tables don?t work at all. 1% throttle input and it jumps to the correct cam timing tables, back to idle and it jumps back to a default value for both intake and exhaust. I?ve commanded 15 degrees on every cam table and it works perfect off idle for following the tables. Back to idle and not commanding any of my values. I?ve been attempting to ?park? the cams different for a more aggressive idle. Support has no followed up.

    Also upset there is no way to control fueling outside of driver demand(wot). Gas mileage is piss poor at 1 lambda on e85. I have improved my gas mileage once my maf and spark timing were perfect, so I?ve gained a tad. 200 miles to a tank, driving nice.
    Last edited by harmless; 1 Week Ago at 11:49 PM.

  2. #2
    Senior Tuner BackyardTurbo_FTW's Avatar
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    I would assume if you bought a tune from MEP that he tuned the cam timing tables. But there are definitely substantial gains to be made over stock if you're starting over with the cam timing!

    Ive found the idle cam tables don't seem to work as well. I tried to set it up for the "ghost cam" crap just to see how it would sound and could not move the cams at idle. I didn't put a ton of effort into it honestly after it didn't just work.

    Someone else had posted before about changing the stoich lambda. You can try and raise the stoich min and max to achieve a leaner cruise. They never reported back if that worked on their car from what I can remember. BUT, on corn you are going to lose SOME MPGs, its just the nature of the beast. You can def minimize it with cruising leaner and increasing timing further in the cruise areas.

  3. #3
    Tuner in Training
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    I tried this on my car, even though the I had 1.05 lambda targeted it, it would only correct to 1 lambda. So I'm not sure if i've got the wrong table, but I wasn't able to get it anyleaner.

  4. #4
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    That person was me. The min and max stoich only work in driver demand mode(wot). Hp tuners made it clear to me that 1 lambda was hard coded in. Maybe they just haven?t given us all the table we need yet.

    Same thing with the cams, idle tables only work in driver demand mode... meaning it?s pointless. The scanner reports it?s using tables I can not see.

    Current tuning wall is injector multiplier. Decreased my maf to shift different, increased injector multiplier and when I floor it I get limp mode.
    Last edited by harmless; 1 Week Ago at 09:24 PM.

  5. #5
    Senior Tuner BackyardTurbo_FTW's Avatar
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    Have you raised your permissible tq from pedal table??

  6. #6
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    I?m assuming I should treat this table with care, increasing percentage wise till limp mode is no longer an issue?