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04-27-2022, 12:39 PM | #1 |
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High rpm bogging
Long history in a short period. NA engine rebuilt after rocker arm/timing chain issue. What would cause the ignition timing advance to drop at wot? Still waiting for my tuner to get back to me.
https://datazap.me/u/blsfrs/log-1644...&data=10-20-21 |
04-30-2022, 10:47 AM | #2 |
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Funnier behavior. If I push the pedal 3/4 (under load, 2nd and 3rd gear pulls) to the floor, the rpms go from 3000 to 7300, no problem.
If I push the pedal 4/4, at around 5000, the engine bogs like hitting a rev limiter and my ignition advance drops to 3*-5*. The point that the advance drops can vary from 4500 to 7000. Are there any diagnostics I can do while waiting to hear back from my tuner, Said he's going to look at my logs this weekend. |
05-02-2022, 09:32 AM | #3 |
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Did something get changed in the tune recently or is this just since the rebuild?
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The Following User Says Thank You to NoHaveMSG For This Useful Post: | blsfrs (05-02-2022) |
05-02-2022, 11:22 AM | #4 | |
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The Following User Says Thank You to shr133 For This Useful Post: | blsfrs (05-02-2022) |
05-02-2022, 12:32 PM | #5 | |
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March 2021: Ingested something in #3. Ejected intake rocker arms, broke timing chain. Complete rebuild by Cody Dawson. Injectors serviced by Injector Pulse. Engine reinstalled September 2021 PROBLEMS SINCE REINSTALL Intermittent P0219a and P0119f (AFR codes) and decreased power. Replaced: MAF, MAP, upstream 02 sensor. No change. January 2022: PTuning: No problems found. Retuned. NEW PROBLEM: Upon picking car up, found bogging at 5500-6500rpm. On the way to Charlottesville the CEL for secondary 02 came on but hasn't come on again. No improvement with replacement of throttle body. February-March 2022; Bogging/decreased power worsened to the point where the car wouldn't go over 35-40 mph. Upstream cat removed after temp/back pressure tests. Immediate improvement in power up to 6000rpm then bogs like hitting rev limiter. Sometimes improves with 3-4 3rd gear pulls but bogging returns next drive cycle. Installed Nameless 2.5" catted midpipe: No change in bogging. CEL for P0219a and P0119f came on last week. A couple of weeks ago went back to PTing. Their guy could not reproduce bogging. He then rode with me and I reproduced it with him in the car. He and their tuner went out to data log but could not reproduce bogging. I finally was able to send them an Ecutek datalog and am waiting to hear back from them. |
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The Following User Says Thank You to blsfrs For This Useful Post: | NoHaveMSG (05-02-2022) |
05-02-2022, 12:40 PM | #6 |
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05-02-2022, 01:08 PM | #7 |
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Can you log what the sensor voltage outputs are in Ecutek? I wonder if you have something going out or range on the higher end. Also hard to tell if it is picking up any knock and that is why it is pulling timing, though I doubt this is the case. I'd imagine the PT gus have looked at that already. It's hard to tell what's the chicken/egg.
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The Following User Says Thank You to NoHaveMSG For This Useful Post: | blsfrs (05-02-2022) |
05-02-2022, 06:22 PM | #8 | |
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https://datazap.me/u/blsfrs/log-1651...og=0&data=7-12 |
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05-02-2022, 07:33 PM | #9 | |
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05-02-2022, 08:03 PM | #10 | |
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I noticed that none of the PTuning drivers seemed to change my seat position. I have long legs. So, I question if those drivers could push the gas pedal as far as I can. Also, the car was tuned with a failing cat. |
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05-02-2022, 11:25 PM | #11 | |
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The Following User Says Thank You to makinen For This Useful Post: | blsfrs (05-03-2022) |
05-03-2022, 02:49 AM | #12 |
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What is going on with the DI from 4.5 to 5.5 seconds into that log? Fuel rail pressure too. Like an intermittent electrical something cutting out from vibration. Red herring? it doesn't happen in the second pull. I'm always afraid to join in on these discussions.
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The Following User Says Thank You to Ultramaroon For This Useful Post: | blsfrs (05-03-2022) |
05-03-2022, 06:23 AM | #13 |
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Something is quite off mechanically/electronically, also we can t see the tune or if he used custom maps too so really can t help, just look to me that something is too off to be tune related
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The Following User Says Thank You to tomm.brz For This Useful Post: | blsfrs (05-03-2022) |
05-03-2022, 08:56 AM | #14 |
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Good observation. I didn't see that before. It looks like the afr goes rich when the timing advance drops. Maybe it unburnt fuel as a result of lack late spark?
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