05-16-2019, 10:01 AM | #23 |
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I certainly can not be certain beyond a doubt but I do believe that the odds are in my favor of being correct. There's way too many people running these mods and more with no engine failure. There's a thread of an M2 being converted entirely to a track car and regularly raced competitively with no engine failure. When the dust settles I still think that this is a motor failure that would have happened regardless if modded or not. Time will tell. We're all just guessing at this point.
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05-16-2019, 10:11 AM | #24 | |
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Try telling a dealer that there are many people running the same mods with no engine failure and that's why it is BMW's fault. I am pretty sure the warranty will be denied right away. If the OP has a pretty good relationship with the service department at the dealer, I think the best way forward is to fess up about what happened and ask for some good will. There are certain strings that the dealer can pull and they would love to do a job like this because of all the labor involved. I wouldn't go in there guns blazing accusing BMW of building a faulty engine because other people have used the same mods with no failure. Good luck to the OP.
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05-16-2019, 10:14 AM | #25 | |
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05-16-2019, 10:22 AM | #26 |
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Possible, but highly unlikely. Within my local track community, I have heard of a couple of instances of something similar happening. Both cars had downpipes, intercooler, and were tuned. One happened at Road America and the second happened at the Autobahn Country Club.
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05-16-2019, 10:28 AM | #27 | |
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Interesting. |
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05-16-2019, 11:01 AM | #28 | |
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OP there are tons of used n55 complete engines for sale at $4k-$8k on ebay, and used s55s for $10k still not cheap but cheaper.
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05-16-2019, 11:25 AM | #29 |
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05-16-2019, 11:45 AM | #31 | |
Luxury at the redline :)
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A customer with such mods is not worth the hassle and I don't blame them. |
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05-16-2019, 11:52 AM | #32 | |
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In theory dealers/manufacturers can't void your warranty purely due to aftermarket parts. In reality, you can't afford to fight them. |
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05-16-2019, 12:06 PM | #33 | ||
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"High flow" cats that are actually flowing at a higher rate than stock cats should trigger a CEL. Why even bother half risking it all for questionable gains.. : The only real solution if you're going after more power is a balls-out catless DP with a tune to disable the emissions check.. At least then you know exactly what you're getting yourself into without some wary assurances.. |
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05-16-2019, 12:35 PM | #34 | |
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https://f87.bimmerpost.com/forums/sh...3&postcount=56 |
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05-16-2019, 12:39 PM | #35 | ||
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05-16-2019, 12:46 PM | #36 | |
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If there is a decrease in cat material and the O2 sensors are moved out of the exhaust flow a proportional amount then the sensors should continue seeing the decrease in emission the computer expects. That is until someone starts "tuning" other parameters, mixing gas, etc. IMHO those are people having a CEL w/the FSDP. If you remove the cat entirely then there's no decrease in emissions between the sensors so the lower sensor would have to be so far out that it's not feasible to construct a catless pipe that way. Which is why it's easier to lie to the computer through programming...these are not the droids your looking for... All that said, what the heck do I know. Last edited by omasou; 12-11-2019 at 07:13 AM.. |
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05-16-2019, 12:56 PM | #37 | ||
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And FS only claims a 20hp increase "with a tune." My theory is the louder exhaust sound with a sports DP is what fools folks into believing it's producing more power. If your vehicle is new and has a proper functioning stock cat, there is only so much to gain with a catted downpipe, beside the raspy sound. |
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05-16-2019, 03:24 PM | #40 | |
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If that is correct, the question then becomes what caused the 'super knock'? There could be any number of things, but I did think the DME protections were put in place to prevent this by retarding ignition etc. as soon as light knock is detected. I suppose it's possible that if there were extremely high IATs combined with an aggressive tune, low octane west coast fuel, lack of fuel rail pressure due to LPFP starvation on track which would cause the combustion to run lean, possibly some other things creating a perfect storm of conditions that even DME protection algorithms couldn't prevent damage to the engine. It therefore might be true that a Downpipe and / or tune are unlikely to cause an engine to fail, but a combination of bolt ons and conditions at a track could create the perfect storm condition that could cause engine damage. Perhaps a stock M2 would have gone into limp mode earlier, or run less boost etc. The truth is we'll never know unfortunately... The OP stated at some point that the M2 was his first turbo car. My M2 is my first turbo car as well, and I personally found that I had a huge amount to learn about the way forced induction engines are controlled. I still have a lot to learn but I certainly wouldn't have ignored a super knock code in the DME on a track day. Whilst I have sympathy for the OP, and I'd hate to be in his position, I don't think the takeaway is that the M2 isn't track suited, or tuning your car is especially dangerous. My take away is that when tuning, keep an eye on logs and error codes, even if you're not at the track, but especially if you are. BM3's logging and dashboard capabilities are great, and it does worry me that some tunes like the VF maps don't suggest getting logs or monitoring things like knock and IATs.
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05-16-2019, 03:50 PM | #41 | |
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05-16-2019, 04:01 PM | #42 |
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I wouldn't tune on it unless you have something to increase that rating.
The car pulls timing even with just 91 and an upgraded intercooler. These are High Compression, Forced Induction motors...octane should not be taken lightly. But day to day use 91 on a stock car will have to do. Crappy for us West Coast people. But if I track my car with a tune I'm filling up the tank with 100octane. Even if it is over 100 dollars to a tank. That's the price to pay...tracking isn't cheap, these cars aren't either. |
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05-16-2019, 04:24 PM | #44 |
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There is a night and day difference when going to FS DP from stock. There is no question, your ass tells you and that’s better than any imperial data. If you can’t feel it, what’s the point?
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