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2010 2011 BMW 5 Series Forum F10 catless downpipe for 535 opinions |
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04-30-2015, 10:39 AM | #23 |
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Apparently you fail to see how no matter what you do, it hits 5,500 rpm and ends at the same place... unless you have another suggestion why it can't make any more power up top?
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04-30-2015, 10:47 AM | #24 | |
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Once you get out of first gear, your car wont ever drop below 5500-6000 rpm again (depending on 6 speed or 8 speed trans) unless you're manually shifting it at a lower RPM, so basically you're investing more money into it when all you're doing is spinning the turbo harder down low, and once you hit about 5500, its out of air. This is why people are getting HUGE gains off aftermarket turbos on these cars, and why you don't see any N55 535s picking up much from stock. If you want to count the under the curve gains, sure you can make a bunch of power... but honestly what good is that unless you just want the car to "feel" fast, or blow the tires off. I don't get offended one way or another if you dump a bunch of money into those engines and feed off the hype of "40-80 horsepower gains" when the power only comes on in a specific area of the curve. BMW did a great job at perfectly matching that turbo to the inline 6, which is why it spools up fast for a single turbo as opposed to using a larger turbo that may yield larger gains for aftermarket stuff but suffer on spool time. The downside is with that perfectly matched turbo, there just isn't any room for improvement except the areas where the turbo isn't on full demand, such as the mid range and lower RPMs. |
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04-30-2015, 10:52 AM | #25 | |
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It tapers off torque just like a BMS N54 tune does. I'd imagine there has to be some sort of conservative approach to a nationwide tune. I'm sure if you lean on it with a custom tune you could probably increase duty cycles up top to help. |
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04-30-2015, 10:55 AM | #26 |
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If your engine hits max HP at 4500-5000 rpm, what are you shifting at redline ?
I would shift at 6000 rpm so car is always in the power range between 4000 - 6000 rpm. Thats what all the N54 guys do.
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04-30-2015, 12:25 PM | #27 |
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Call me crazy, but I guess I bought an automatic car so I don't have to shift...
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04-30-2015, 12:28 PM | #28 |
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But you said that Catless DP do not provide any benefit because engine is maxed out. You should have said Catless Downpipes do not add any gains because im too lazy to shift at 6000 rpm
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04-30-2015, 12:31 PM | #29 | |
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IF someone did make a neat E85 tune for that car where it could reliably and correctly run 100% E85 and not a mix, you could get a lot more timing out of it before inducing knock retard, but unfortunately on 91 or even 93, the correct answer isn't just keep adding boost until you run out of turbo, and then keep trying to add more. The other manufacturers have been playing that game for decades now and none of it ended well for the owners that tried it. I guess on the upside, it may give you the unexpected opportunity to put a forged rotating assembly and correct turbo in after whats left of your engine comes out |
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04-30-2015, 12:35 PM | #30 |
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04-30-2015, 06:51 PM | #31 |
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FenixMike I do get your point and to some it is less than ideal to have to manually shift at 6000rpm and it would be nice to be able to flash the tcu to change the shift point.
In my case I am most of the time doing city driving and added torque add to driving enjoyment. Also I am not that often full throttle so I am not much worried about premature turbo wear, I am also not tracking my car. The few times I am doing spirited driving, I am already using the paddle shifter. Still if you do not shift at 6000 rpm there is still some gain up top vs stock with a tune (adding anything else do not add past 6000rpm though). All your comments are informative to help people decide if those mod are for them or not but to me a 1200$ including installation (JB4 and downpipe) to gain around 15% peak hp on 94 pump gas we have here in Canada is a no brainer. Adding anything more on top of that (excluding turbo upgrade) will be considered as mostly a waste of money. By the way I am coming from an Audi A4 2.0t (7 years of fun) with a tiny turbo with all bolt on so I am already used to that type of feeling "Diesel" like since you have a lot of torque but need to shift in lower RPM. Also the turbo was still running strong after 100k miles. |
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05-01-2015, 08:47 AM | #32 | |
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05-01-2015, 10:57 AM | #33 | |
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05-01-2015, 11:04 AM | #34 | |
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Im just hoping people will go through the true costs of what it will cost THEM to do these mods before whipping out a credit card and spending the next few months paying it off with disappointment. Im glad I did my research, but many others may see its ok for them and be perfectly content... as I said, doesn't matter to me one bit what anyone does, I'm just trying to provide insight to my research. |
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05-10-2018, 09:02 PM | #35 |
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I know this post is 3 years old but i have a question. I have a F10 535i and wanna know if a Catless downpipe with stock exhaust will be loud inside the car.....and what it sounds like outside the car...anybody care to comment?
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05-10-2018, 09:07 PM | #36 | |
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05-10-2018, 09:10 PM | #37 | ||||
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05-10-2018, 10:19 PM | #38 | |||||
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05-10-2018, 10:22 PM | #39 | ||||||
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Thank you for the advice Paul
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