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Thread: Cylinder Gain settings. Anyone use this table?

  1. #1
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    Cylinder Gain settings. Anyone use this table?

    I wanted to experiment a bit with this table. In the OE configuration, this function is disabled. E38; Fuel > General > Injector Gain / Injector Gain vs Cylinder

    It looks like a standard multiplying table. I'm assuming that if I wanted to en-richen cylinder #7 2%, I'd just enter a value of 1.02? Is that correct?

    And the cylinders are identified as A-H, is A - 1 and H - 8?

    My left bank is running about 5% lean, in comparison to the right bank. Up till around 2500 anyway, then they both level out.

    Thought I better ask first, before screwing around with this table.....
    When arguing with an idiot, make sure he isn't doing the same thing....

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    I haven't, but I have wondered about it.. there's also a static timing retard per cylinder table that I saw. Wonder if those two could help with the whole cylinder 7/8 going boom thing.
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    Quote Originally Posted by schpenxel View Post
    Wonder if those two could help with the whole cylinder 7/8 going boom thing.
    What 7/8 going boom thing?? Just wondering if you had a moment to expound on that a bit, either in this topic, or open another?

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    With the intake manifold design on a lot of LS engines, 7 and 8 tend to run a little hotter than the rest of the engine...at least from what I've seen. I think they wind up a little leaner. On a really high strung setup tuned for max power, this can eventually result in a cracked piston.
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    Quote Originally Posted by tek1229 View Post
    What 7/8 going boom thing?? Just wondering if you had a moment to expound on that a bit, either in this topic, or open another?
    Quote Originally Posted by MikeOD View Post
    With the intake manifold design on a lot of LS engines, 7 and 8 tend to run a little hotter than the rest of the engine...at least from what I've seen. I think they wind up a little leaner. On a really high strung setup tuned for max power, this can eventually result in a cracked piston.
    Yep, that. It's typically only a problem on forced induction engines but I'm sure someone without FI has broken a piston or two over the years. No rear steam vents on a lot of LS engines doesn't help matters, IMO
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    k, whew.. so for just a regular gen 4 in a silverado I should be ok.. not going forced induction, lol least not planning on it in the near future..

    thanks!!!!

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    unlikely you'll break anything without a blower or turbo or nitrous
    Last edited by schpenxel; 07-06-2015 at 12:25 PM.

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    Last I tried that feature it caused issue under WOT, which is where it was needed anyway.

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    Quote Originally Posted by LT1Z View Post
    Last I tried that feature it caused issue under WOT, which is where it was needed anyway.
    Can you elaborate?

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    I tried playing with that a while back, but didn't see any change. Maybe I wasn't adjusting enough. Dunno... Let us know if you manage to get banks more even.
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    Quote Originally Posted by tek1229 View Post
    k, whew.. so for just a regular gen 4 in a silverado I should be ok.. not going forced induction, lol least not planning on it in the near future..

    thanks!!!!
    Quote Originally Posted by schpenxel View Post
    unlikely you'll break anything without a blower or turbo or nitrous
    I'd be a little more cautious in a Silverado than in a car...if there's a possibility of the vehicle towing or carrying a heavy payload, you should give it more fuel at full throttle...even if it makes the most power at say 12.8:1, I'd run it fatter, more like 12.2:1 or something...that little bit of fuel can be an engine saver when it's pulling a lot of weight up a hill for an extended period of time.
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    Does anyone know what # cylinder the letters represent? I'm not sure if it goes by sequential order or firing order. Can't seem to find the answer in the help menu..... I may have just over looked it though.

    I figured I'd try adding bias to the "lean" bank first, to see how that goes first. Then possibly reduce the "rich" bank.

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    Quote Originally Posted by Michael_D View Post
    Does anyone know what # cylinder the letters represent? I'm not sure if it goes by sequential order or firing order. Can't seem to find the answer in the help menu..... I may have just over looked it though.

    I figured I'd try adding bias to the "lean" bank first, to see how that goes first. Then possibly reduce the "rich" bank.
    Here's what I found on that earlier when I was looking at an E38 tune.

    "Typically, ABCDEFGH = 18726543"
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    Quote Originally Posted by schpenxel View Post
    Here's what I found on that earlier when I was looking at an E38 tune.

    "Typically, ABCDEFGH = 18726543"
    The injector bank select table uses the same ABCDEFGH scheme, and it's setup for 01011010, which agrees with the even/odd pattern of the 18726543 where 0's are odd cylinders and 1's are even cylinders...so I would tend to think that would be the same in any table referencing the cylinders individually...just follow the firing order.
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    Thanks fellas, that makes sense. I'll play around a bit and report back.

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    I was able to adjust the banks to get bank to bank trims closer (overdrive gear is still high). But, at higher rpm (over 4K), trims go nuts. They go very high, hold, then go very low. I have not ever seen anything like this before. It is repeatable. I had SD disabled running MAF only. PE disabled, COT/DFCO/CFCO all disabled. About 24 minutes into the log is where you can see this. Not knowing what is causing this, I'm done screwing with this table.

    I've been seeing an imbalance of roughly 4%, so I tried bumping the left bank cylinders up 1% each, then I tried lowering the right bank the same, then lastly, tried .5% up on the left bank cylinders, and down .5% on the right.

    7-11-15 -EVEN ADJ-01.hpl
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    You sure that's the right log? It's only showing up as ~10 minutes long for me

    Around what frame # does it do it?
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    Quote Originally Posted by schpenxel View Post
    You sure that's the right log? It's only showing up as ~10 minutes long for me

    Around what frame # does it do it?
    Whoops! Wrong log, sorry. I'm actually surprised anyone is interested.....frame 39000

    7-11-15 -lft-RT bnk adj-03.hpl
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  19. #19
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    I am, in fact, THAT bored. lol

    Got a copy of the tune that was on it during that log?

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    Quote Originally Posted by schpenxel View Post
    I am, in fact, THAT bored. lol

    Got a copy of the tune that was on it during that log?
    HaHa.... Well in that case, why yes I do!

    7-11-2015-GAIN TEST-MAF ONLY_02.hpt
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