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05-07-2020, 08:57 AM | #23 | |
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05-07-2020, 09:08 AM | #24 | ||
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Did you check AFR? At what rpm was that hiccup you describe? I am currently on a 100 octane tune. Just looked up the injectors, they are dirt cheap. I might change them in some time since I am getting close to 50k miles (77k km currently).
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05-07-2020, 09:29 AM | #25 | |
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I saw notes previously people were buying them in the $300 range for a set from FCP.
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05-07-2020, 09:33 AM | #26 |
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No I haven't logged AFR yet. its around 2.5-3k rpm for me.
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05-07-2020, 09:34 AM | #27 |
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I just saw them on ecs for under 60 a set. I've been looking at injectors as I'm getting bigger ones for the stroker. Sorry for the thread jack!
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05-07-2020, 09:36 AM | #28 | ||
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Sounds about the same then. What exhaust setup do you have and how many miles on the car?
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05-07-2020, 09:46 AM | #29 | |
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Are you talking about spark plugs? Injectors are $68.50 each. https://www.ecstuning.com/b-bosch-pa...647838440~bos/
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05-07-2020, 09:47 AM | #30 | |
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110k on it. Probably original injectors, coils and o2 sensors. Spark plugs are only a few months old, probably 2k miles.
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Last edited by tdott; 05-07-2020 at 11:03 AM.. |
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05-07-2020, 10:05 AM | #31 |
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I'd take everything back to 100% stock, running 241E (that's the current one right?)
Check fuel flow rate, ignition, compression, timing advance, and the plugs/coil packs. Probable you've done this already, but eliminating every possible variable is the first step to an accurate diagnosis. Our thoughts and prayers are with you my brotha' |
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05-07-2020, 10:41 AM | #32 | |||
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I agree, datalogging with the stock xpipe for comparison would be a good idea. Although I don't know if that would bring me closer to a solution - I want to keep the custom xpipe and as you can read SYT's posts, there's nothing fundamentally wrong with it. I didn't put any weird mods on my car - apart from the xpipe I have a carbon afe intake (new mod, didn't change anything, the hiccup was there with the stock intake too), and Alpine tune (same story). Basically the first mod I put was that xpipe and it was on a stock car. After that the car immediately started behaving like that. I have no fault codes, the only thing I can see now is that the car is running rich at the rpm that it feels weak. It's really weird, since other than that it pulls really great, and part throttle at low rpm is also very good (with good and stable afr as well). Guess I just could avoid flooring it under 3k and let it go, but on the other hand I am very curious what's causing it.
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05-07-2020, 10:50 AM | #33 | |
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I am never able to post pictures on forums, all my pics are on IG @baye30 https://www.instagram.com/baye30/
Current Garage - [2011 E90 M3 ZCP] [2005 E53 X5 3.0 Sport] [1988 E30 325IS 24V] |
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05-08-2020, 03:31 PM | #34 |
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Tested the original tune today. Same stuff, AFR drops at about 2.5k rpm. It doesn't go as low as 12, but I noticed the car runs generally leaner than with the stage 2 tune. The hiccup was exactly the same as with the tune, so it's definitely not causing it.
Cold start was the same as far as rpm goes, just louder - so most likely the secondary air pump doesn't engage with the tune I have (like it should), but for some reason the rpms still go up and the car sounds the same (ticking, like it has a leak), just a bit quieter. What (apart from low battery) can cause high rpm (1100) on a cold start even with cold start deleted?
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05-08-2020, 06:36 PM | #35 |
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So odd... someone else has a Alpine tune and a Bimmerworld Xpipe with cats in the secondary position and complains of low rpm sluggishness... I'm not sure if that existed before the xpipe install or not Audioslave686
Edit: and now that I think about another friend with a BW catless xpipe and an ESS tune doesn't complain about anything. Could perfectly be coincidence, I'm sure the Alpine tune is just fine. The Bimmerworld xpipe is a high power design like the ESS one and many others, with an X as forward as possible |
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05-08-2020, 07:34 PM | #36 |
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I have the BW race pipe on the Alpine stage 2, no issues.
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05-08-2020, 10:03 PM | #37 | |
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Then I installed bimmerworld x pipe and Stage 2 and I started to experience some pre-detonation sometimes. But I learned to live with it. Just stay higher than 2500 rpm. Lol I wouldn't blame a tune for that. I think it is a combination of factors. I was flushing the ECU to stock and Stage 1, but the issue was still there |
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05-09-2020, 03:12 AM | #38 | ||
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Curious why SYT didn't ever have such problems with that xpipe then. I got another Emissions check engine yesterday evening, I'm very curious what's that. I'll read that later and let you know.
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05-09-2020, 07:15 AM | #39 |
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Here you go, once again fuel pressure fault code. I have the low fuel pressure sensor already on the way, I'll change it next week.
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05-09-2020, 10:44 AM | #40 |
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I have also checked another thing - fuel pressure and fuel pulse in the datalogs I recorded. Fuel pressure stays relatively the same.
Fuel pulse readings mimic afr - they drop to about 8-9ms at 2500rpm, then raise to 12ms at 3100rpm and stabilize at 11ms afterwards. Could someone tell me what does fuel pulse reading inform about?
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05-09-2020, 11:45 AM | #41 | |
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Btw I already replaced a low-pressure fuel sensor. It had zero impact, however, I didn't have any fuel-related fault codes. Sometimes I'm getting O2 sensor codes, despite I have only around 5000 miles on them |
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05-11-2020, 08:43 PM | #42 | |
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What i felt driving audioslave's car is a clear problem with the car even though it doesn't throw a CEL. For whatever reason it is not happy at those rpms and I'd bet a bmwlogger log would show similar results to what you see. Again, I don't really think it's tune related, but something is wrong. Audioslave and another friend both did the same xpipe at the same time with similar miles on their cars, one of them has a alpine tune and the other has an ess tune, the ess tune guy doesn't have the hesitation. If you are running into CELs then all bets are off, as even shadow codes will upset the ECU. But I guess we'll know better the day we switch tunes on audioslaves car to another tune. (For the record, i don't have ess or alpine tunes on any current cars). Every two years I swap my E92 back to the stock tune and xpipe and it's just a downgrade in every sense. A hesitation like you two are describing is not something easy to miss |
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05-11-2020, 09:07 PM | #43 | |
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I had a very similar issue when I installed my MS catless x pipe . Except I was throwing misfires on one side of the engine . Car would also misfire if I came to an idle but not while cruising. Anyways mine was an exhaust leak were the header and the x pipe meet . The clamps were tight as hell on both sides so I didn’t think it was issue until I pushed up against the test pipe and it would slide up and down on the header clamp. If that makes sense. yet the other side Wouldn’t budge or move. But it Wouldn’t hurt to double check . |
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05-12-2020, 03:16 AM | #44 | ||
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I have sent quite some time analyzing the logs and graphs, to me it looks like this: O2 sensor finds too little oxygen in the exhaust gases at that rpm range for some reason (Lambda about 0.85, afr about 12.5) -> then it causes a fuel trim of usually about -10%~-15% -> then the fuel pulse width is reduced and therefore the engine has less power. All these readings have a significant dip at about 2500 rpm. I was thinking what factors can cause a rich fuel mixture and basically all can be ruled out - MAP readings look good, airflow looks good as well, so it isn't poor air delivery for sure, fuel trim is negative and pulse width is reduced, so it's rather unlikely that the engine is getting too much fuel. Only things left are poor combustion process and false o2 reading. I used to get some o2 sensor faults last year, they disappeared eventually but it doesn't mean they are not faulty anymore. Sprak plugs as I mentioned are 25k km old, so changing them will be also a good idea. Basically I plan to replace o2 sensors and spark plugs, since they aren't that expensive. After that I'll check the logs again. If the problem still occurs, I'll probably ask Alex to prepare a custom tune for me, I hope he'll be able to address this issue. My bet is false reading from the O2 sensors, since the reaction caused by them reading too rich is inadequate (trimming fuel does not improve engine operation, makes it worse). The only thing that is completely weird for me is that it occurs always and only at 2500 rpm. Not at idle, not at redline, not anywhere else in the rev range.
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