08-02-2022, 08:29 PM | #45 | |
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That said, some say long term fuel trims can be impacted but there is very little to no data that supports that, from what I've found. |
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08-02-2022, 08:56 PM | #46 | |
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08-02-2022, 10:49 PM | #47 |
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It's not afr's im worried about - since bmw's have incredibly smart ecus that can adapt. I am more worried about slight overboosting, because with a catless downpipe it spools much faster causing overboosting if not tuned for.
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08-02-2022, 10:54 PM | #48 | ||
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Drives: 2017 Big Turbo BMW M2
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08-03-2022, 09:43 AM | #49 | |
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Good deal on hardware. Didn’t see it mentioned. |
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08-03-2022, 09:44 AM | #50 | |
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08-03-2022, 01:19 PM | #51 | |
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When you say overboost, are you speaking on the car throwing a code/ hitting a limp mode or just small increments of boost outside of what the car is targeting? I can confirm my boost levels "appear" consistent but obviously that changes dramatically based on temps and various other factors. Ranges are all the way from 13.5-17psi per weekend |
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08-03-2022, 02:31 PM | #52 | ||
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08-03-2022, 02:44 PM | #53 | |
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08-03-2022, 06:26 PM | #54 | |
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Aren’t these cars basically MAF with MAP to supplement? These concerns seem slightly OCD to me given BMW offered an optional exhaust that would present similar “concerns”. I know you’re well versed on all this theory and what not F87source but I’d love for a tuner with extensive experience tuning BM3 or Ecutek to weigh in on just how material concerns like this are because I’m missing something. |
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08-03-2022, 09:40 PM | #55 | |
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AFR's should be fine as the car will adapt to it (as long as you aren't asking for it to adjust stft more than +/-30% which is the max) the over boost if small should also be ok - only if it isn't a major issue. 0.5 psi is very little and should be ok, but what happens if the over boost is alot, say a couple of psi when you're doing a full throttle pull? This scenario could cause a large knock event, because the ECU isn't expecting this. In higher gears the turbo spools faster than the rpms increase, and if you over boost alot here this could exacerbate lspi, and lspi is what blows motors. Imo I'm not ok with any of this on my personal car, I would never run a single mod that is not closed loop (i.e. charge pipes and intercooler which don't affect anything as they cannot alter the volume of air going into or out of the engine, or affect afrs) without a tune. So this thread kind of bothers me, because you ideally should never run a single non "closed loop" mod without a tune, you should also never rely on the ECU to adapt for everything or else you're asking for trouble (especially if you're asking for too much or somehow end up running in open loop mode). I always say bmw owners are really spoiled (myself included because I used to spend $1k on dyno tunes for every single mod I installed on my sti) because of how strong these engines are and how smart these ecus are, and how these things allow bmw owners to get away with things that shouldn't be permitted. But this teaches really bad habits, like chasing power mods over doing supporting mods first. Anyways this was just my rambling - ignore if you wish it's just my opinion coming from japanese cars which were really fastidious. No, these cars are map based, the maf sensor does very little (idle conditions), as soon as your on load it's map based. A cat back exhaust does little to affect anything, the catalytic converter is what your should be worried about. Even on a Subaru where the ecus are extremely stupid and you must tune for literally every mods even an intake, catbacks don't need a tune. Mhd was the one that told me not to flash stage 0 in order to delete the cel and run a catless downpipe. They told me it would be best to run it with a tune so I wouldn't get overboosting issues. Last edited by F87source; 08-03-2022 at 10:10 PM.. |
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08-04-2022, 01:24 PM | #57 | |||
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08-04-2022, 01:39 PM | #58 | ||||
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What straight pipe are you running? You changed your CP, yes?
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08-04-2022, 05:35 PM | #59 | |||||
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Amazed that this part still exists in plastic, lol |
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08-04-2022, 05:37 PM | #60 | ||
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We learned the hard way on my buddy's WRX back in the day. Even a cone filter caused it to hit a hard cutoff at 4k RPM. |
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08-04-2022, 05:39 PM | #61 | |||
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08-04-2022, 05:48 PM | #62 | ||||||
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But yeah with it being plastic I sold mine for $100 and replaced it as a Maintenance Preventive measure
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08-05-2022, 07:05 PM | #64 | |
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Even a car back exhaust slightly altered fuel trims, but thankfully not enough to require a tune. Nice!!! What a beauty! Get us some exhaust clips if you can!
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08-05-2022, 07:23 PM | #65 | ||
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I will soon
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