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  1. #161
    Active Member Two Rings
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    Quote Originally Posted by whiped View Post
    Cool, super helpful fuel logs.

    You're leaning out a bit up top but I think that is a result of the tune and not mechanical. (Injector window gets shorter for some reason)

    Any idea what timing request is on this tune? (It doesn't really change which is why I didn't have you log it assuming you know it :) )

    If possible try to switch to something with mid 20* of timing and do another set of logs. These parameters are fine for the time being. I'm just trying to rule things out.
    I'm not sure. The EPL DP 93 octane tune. I'll ask them tmrw. I think it's meant to lean out at the top, actually.

  2. #162
    Senior Member Four Rings whiped's Avatar
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    Oh ok, I thought you were on GIAC for some reason.

    You're not going super lean just deviating from requested. Doesn't Tony have a tune specifical for an Ethanol blend?
    Geoff
    '13 S4 - Glacier White | DSG | 034 Stage 2+ | Current Setup
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  3. #163
    Active Member Two Rings
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    Quote Originally Posted by whiped View Post
    Oh ok, I thought you were on GIAC for some reason.

    You're not going super lean just deviating from requested. Doesn't Tony have a tune specifical for an Ethanol blend?
    They're reviewing the logs i sent them yesterday. I'm stumped man :(

    Thing is, high end power feels fine, throttle response under like 3500RPM feels like poo though.

    how did my fuel pressure numbers look? specifically down lower?

  4. #164
    Established Member Two Rings
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    Fuel pressure is fine. Lambda request (a.k.a requested AFR) is not what I would call "performance" enrichment until after 4,000rpm. The calibrator (a.k.a. "Tuner") is responsible for the lambda request. Actual follows requested quite well. The engine is doing what the ecu is telling it to do.

  5. #165
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    Quote Originally Posted by sb_gli View Post
    Fuel pressure is fine. Lambda request (a.k.a requested AFR) is not what I would call "performance" enrichment until after 4,000rpm. The calibrator (a.k.a. "Tuner") is responsible for the lambda request. Actual follows requested quite well. The engine is doing what the ecu is telling it to do.
    Everyone else running this tune isn't having problems... That's the thing.

  6. #166
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    Quote Originally Posted by Morritse View Post
    Everyone else running this tune isn't having problems... That's the thing.
    I don't know what to tell you, other than numbers don't lie. Maybe everyone else is oblivious (believe it or not this is actually highly likely)?

    Do you expect that you will get good power with a .90 fuel request @ 4000 rpm on full boost? This engine can make full boost under 2,500 rpms, and the fuel request needs to account for that. It's obvious that their target lambda is ~.80 (which I'd expect to see throughout the powerband) because it eventually enriches to that after 5,000rpm. So why not earlier in the power band like every tune ever on every FI platform? Look at logs from other tunes in this thread. Performance enrichment is in effect immediately when you hit the throttle.

    I just looked through this entire thread for someone else with an EPL tune that had actual or desired lambda logged an came up with nothing.

    Someone who has an EPL tune, I don't care what stage or options, should log their file and include actual and desired lambda. Then we can see if maybe they missed something in your file, or maybe that's just what all of their tunes are doing.

  7. #167
    Active Member Two Rings
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    Going to log with a different tune. Will post ASAP

  8. #168
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    Quote Originally Posted by sb_gli View Post
    I don't know what to tell you, other than numbers don't lie. Maybe everyone else is oblivious (believe it or not this is actually highly likely)?

    Do you expect that you will get good power with a .90 fuel request @ 4000 rpm on full boost? This engine can make full boost under 2,500 rpms, and the fuel request needs to account for that. It's obvious that their target lambda is ~.80 (which I'd expect to see throughout the powerband) because it eventually enriches to that after 5,000rpm. So why not earlier in the power band like every tune ever on every FI platform? Look at logs from other tunes in this thread. Performance enrichment is in effect immediately when you hit the throttle.

    I just looked through this entire thread for someone else with an EPL tune that had actual or desired lambda logged an came up with nothing.

    Someone who has an EPL tune, I don't care what stage or options, should log their file and include actual and desired lambda. Then we can see if maybe they missed something in your file, or maybe that's just what all of their tunes are doing.
    I've got some in the EPL owners discussion thread. A page or two back. Both banks lambda requested vs actual. Im running the DP E85 file


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  9. #169
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    Quote Originally Posted by Johnson View Post
    I've got some in the EPL owners discussion thread. A page or two back. Both banks lambda requested vs actual. Im running the DP E85 file
    Care to provide a link?

  10. #170
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    Quote Originally Posted by sb_gli View Post
    Care to provide a link?
    https://www.audizine.com/forum/showt...php?p=13192442


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  11. #171
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    Those are just graphs, and I can't be sure of the logging source to trust that it's accurate, but yours has a .90 lambda request all the way to redline, and actual doesn't match desired at all. What the?

    I've found a few other EPL logs floating around and the lambda request is delayed on those like I see here too. I don't really understand this strategy. It's a supercharged engine, boost is immediate, you don't need a leaner request to help spool up a laggy turbo. Perhaps this fueling strategy is intended for some other reason?

    I would think you'd want to get right to performance enrichment as (~.80 lambda) soon as possible as to further cool the combustion charge, help prevent detonation, and reduce egts. Logs from other tuners exhibit this strategy.

  12. #172
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    You have to talk about fuel type when talking about lambdas... Can't just be .8

  13. #173
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    You're thinking AFR. I am talking lamdba, just like what your o2 sensor reads. lambda 1 = stoich no matter the fuel type.

  14. #174
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    Oh right. You have to account from lambda to afr... Not the other way around.

  15. #175
    Senior Member Four Rings whiped's Avatar
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    It's probably just Tony's tuning strategy. Mine lambda targets 0.81 in low RPMs and leans out a bit as it gets above 6000

  16. #176
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    Whiped, care to post a log with desired and actual from 2k to red line?

  17. #177
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    Quote Originally Posted by sb_gli View Post
    Those are just graphs, and I can't be sure of the logging source to trust that it's accurate, but yours has a .90 lambda request all the way to redline, and actual doesn't match desired at all. What the?

    I've found a few other EPL logs floating around and the lambda request is delayed on those like I see here too. I don't really understand this strategy. It's a supercharged engine, boost is immediate, you don't need a leaner request to help spool up a laggy turbo. Perhaps this fueling strategy is intended for some other reason?

    I would think you'd want to get right to performance enrichment as (~.80 lambda) soon as possible as to further cool the combustion charge, help prevent detonation, and reduce egts. Logs from other tuners exhibit this strategy.


    I'll post the full logs when I get home. You have me worrying now lol

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  18. #178
    Veteran Member Four Rings
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    Erratic, rough idle and crappy gas mileage for a while now. I have another thread dedicated to this but no conclusive feedback yet. EPL Stage 1, ECS Luft Technik intake wand AWE Touring resonated exhaust. Thanks in advance for any help!

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  19. #179
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    https://drive.google.com/file/d/1Oyb...ew?usp=sharing

    Here are the logs. Fuel logs in one tab, performance logs in the other tab.

  20. #180
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    Quote Originally Posted by Johnson View Post
    https://drive.google.com/file/d/1Oyb...ew?usp=sharing

    Here are the logs. Fuel logs in one tab, performance logs in the other tab.
    I am confused by the flat line .90 lambda request.

  21. #181
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    Quote Originally Posted by sb_gli View Post
    I am confused by the flat line .90 lambda request.
    I'm not sure either, maybe someone else can chime in.

  22. #182
    Established Member Three Rings Ford Prefect's Avatar
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    Alright everyone, here are my logs. Go ahead, make your comments about the timing pull, just offer suggestions too!

    https://docs.google.com/spreadsheets...it?usp=sharing

    Could bad gas really be the cause?

  23. #183
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    Quote Originally Posted by Ford Prefect View Post
    Alright everyone, here are my logs. Go ahead, make your comments about the timing pull, just offer suggestions too!

    https://docs.google.com/spreadsheets...it?usp=sharing

    Could bad gas really be the cause?
    yes, the same thing happened to me on 91 as well.
    Take the suggestion and a a few gallons of ethanol.

    - - - Updated - - -

    I did some logs of boost levels, they seem to be a bit low, I'm running the CTS SC pulley and 179mm crank. I may be getting some belt slippage

    https://drive.google.com/file/d/1QF6...ew?usp=sharing

    What do you guys think?

  24. #184
    Senior Member Three Rings awwturbo's Avatar
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    Quote Originally Posted by Ford Prefect View Post
    Alright everyone, here are my logs. Go ahead, make your comments about the timing pull, just offer suggestions too!

    https://docs.google.com/spreadsheets...it?usp=sharing

    Could bad gas really be the cause?
    The corrections are concerning and the boost doesn't seem to be getting to where a stage 2 should be. Max boost from what I calculated seems to be 14.7psi. It looks like you shifted just shy of 6k rpms as well. Try getting to 7,200rpms and see how the timing and boost levels look. But there is definitely something amiss here. Any misfire codes?

    Here is my most current log from last month.

    https://docs.google.com/spreadsheets...it#gid=7437066
    [2012 Audi S4 Prestige | S-tronic | Moonlight Blue | Black Nappa Leather | Sport Diff | Titanium Package | IE Stage 2 tune & DSG tune | AWE Coldfront System | CTS 57.02mm S/C Pulley | JHM 179mm Crank Pulley | ECS Luft-Technik Intake | CR-15 Brace | H&R OE Sport Springs | 034 Trans Insert | ECS rear diff mount | JHM Race Pipes]

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