Can Anyone Check This A/F Log

Discussion in 'Gen II' started by SYNFULL, Aug 4, 2008.

  1. SYNFULL

    SYNFULL Viper Owner

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    Can any of you guys take a look at my first log file since I installed my LC-1 with my air fuel?
    [​IMG]
    I started out in 2nd gear around 3000 rpm. I think I let off the gas a little before I nailed it and that is where it goes to almost 17. When I am WOT it's around 10 or 11, then when I let off a little to shift it goes up to around 13 then stays around 11 again till I let off. Should I be concerned about the high numbers (lean) when I am not WOT?

    Thanks!
     
  2. BOTTLEFED

    BOTTLEFED Viper Owner

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    Looks pretty good, on the rich side, but safe.
    The higher a/f off throttle are normal and still in a very safe area.

    I'm tuning mine to 12:1 a/f so yours is much safer than mine.
    But don't listen to me, I've already blown up one motor :D
     
  3. RTTTTed

    RTTTTed Viper Owner

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    Water/meth?

    I'm not an expert either but yours looks similar to some of mine (with w/m). You may want to zip the file and check it with Sean - he's the expert.

    Ted
     
  4. SYNFULL

    SYNFULL Viper Owner

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    Thanks Guys- I do have w/m. I think that is -an3 which is the yellow line at the bottom. At least I know I am in the ballpark.
    Gary
     
  5. Steve 00RT/10

    Steve 00RT/10 Viper Owner

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    Tune by 250 RPM increments. I have no W/M and and am tuned around 11.5 to 11.8 at WOT. You should be able to smooth the WOT line out by using the 250 RPM steps. I think you have some fuel to take out in the meat of the run, but it looks to me like your transition area may be a little lean for too long. Mine never goes that high. I get a slight bump up when I hit it, then I'll actually go a little rich for a couple hundred RPM. Then I'm dead flat (at target AFR) all the way up from within 500 RPM or so of the log start. A good AFR line should be flat...no jagged edges at all. I'm not sure how to post the thing, but it might be helpful to see it

    Steve
     
  6. EllowViper

    EllowViper Viper Owner

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    I never understood the logic of progressive W/M as your set-up appears to indicate. Max W/M should come on at max load and actually taper off as RPM increases (engine loading decreases)..atleast according to RSR Water Injection. At a constant flow, it does this automatically. I run two 325 mml nozzles at 150 PSI on at 1500 RPM @ 2.3 boost. " Maximum water delivery should be in higher load low to mid rpm ranges tapering somewhat at peak rpms where load is less." RSR Water Injection Calculator
     
  7. Fast Too

    Fast Too Enthusiast

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    Which analog did you tie your A/F input in from the LC-1. Did you select the LC-1 A/F on that analog in the log setup window? It looks like you might have selected the OEM narrow band input for the A/F readout instead. Also the boost should be setup on Analog 3 MPX_US_3 so we can read psi.
     
  8. SYNFULL

    SYNFULL Viper Owner

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    I am using the w/m settings that sean gave me. It is set to
    25% at 3.4 psi
    50% at 4.5 psi
    100% at 5.7 psi

    Fast Too-
    LC-1 is set to AN2 slave - WB LM1 LC1. Sean had to email me a vec file with this setting in it so I could use it.
    I set analog 3 to MPX_US_3 as you suggested.

    Steve,
    You are right. Do I lower the "fuel enrichment percentage" in this area?
    [​IMG]
    Thanks for the help!
     
  9. Steve 00RT/10

    Steve 00RT/10 Viper Owner

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    If you are just starting, I think the best thing to do is to check your LTFT and adjust by increasing or decreasing the base injector set on the fuel options page. I had to add 5% to what it came with (now at 70%). Based on plug color, the cylinder trim can be adjusted a little too, but some miles on the car will give you better input for the trim after getting some good logs. I check my plugs every spring /10,000 miles now. They are all the same color...even the back ones. Looks like you have a VEC 2 so IAT adjustment is not an option. I upgraded my VEC 2s and have nailed the IAT down pretty good. You will definitely need more than one card depending on temperature. I used to run 3 cards before upgrading the VECs. If you consistently run in one temp range it won't be an issue. On the hot side it won't matter as much, it will just run a little rich. However, in low temps, you will run possibly too lean. We run in 30 degree temps in the fall, so I had a 40 degree card along with 70 and 90 degree cards.

    Yes, that is the page you add/subtract fuel from. I have an excel sheet with all my log runs in it. You can proportionally remove / add fuel based on the 250 RPM snapshots.
    I did mine the old fashioned way.........individually with the help of the spreadsheet. Every car is a little different. My AF line is pretty much flat from this method.

    I know there is a better way to get this in here, but here is my attempt. The black line is my AFR. Red is RPM. Yellow is boost. The green line on top is IAT.

    Steve

    [​IMG]



    Steve,
    You are right. Do I lower the "fuel enrichment percentage" in this area?
    [​IMG]
    Thanks for the help![/quote]
     
  10. SYNFULL

    SYNFULL Viper Owner

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    Steve,
    Would increasing the base injector set lean out the tune or richen it? I think I will try adjusting the fuel enrichment % and take out a little fuel there to see how it does.
    I aslo am taking your advice where you said i was too lean in the transition area for too long. This was my settings.


    [​IMG]

    I am going to try to bring it up a little faster.

    Thanks for your help
    Gary
     
  11. Steve 00RT/10

    Steve 00RT/10 Viper Owner

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    Increasing the base injector set will richen the tune in closed loop, but I believe (could be wrong), it is also the starting point for when the VEC settings come into play and you add / subtract fuel pulse duration. Basically when you play with the base injector set, you are fooling the pcm, which thinks it is sending a full signal to 29 pound injectors instead of 50s....or bigger

    The reason I set my LTFT was that I set a lean light early on and found that I had tripped the lean parameters (I belive it's around +32% when the light trips). This meant that over a period of time, the pcm was trying to add fuel back in....and couldn't get enough in. It works between the boundarys of -32/+32%. I could have played with the cylinder trim, but decided to go to square one and get the LTFT set close to zero. Once set, it's not really necessary to chase it around. Weather conditions can impact it some. I'm around +8% right now. I check in the spring just for GP.

    I added / subtracted all my fuel from the fuel RPM page and fuel options page. My fuel load pages are from Sean. Both my cars fuel load pages are different from yours (and a little different from each other). I don't have W/M so my little 5 pounder is probably the easiest to play with for tuning. You very well may need some advice from Sean on your particular situation. I never started with a graph like yours, but the WOT logs were running extremely rich upon installation. I am absolutely no expert in this area, having never done anything like it before, but I've got almost 30K smile producing Roe miles between the 2 cars since 5/06 and no issues.

    Steve
     
  12. SYNFULL

    SYNFULL Viper Owner

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    Steve
    Thanks for all the helpful info. I guess it will take some trial and error doing runs and recording logs and then comparing the changes. I am reading up on LTFT now as I know nothing about it. Thre just isn't a whole lot of info out there on how to tune with the roe software. Thanks to you and guys like Damn Yankee I am learning.

    Gary
     

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