06-21-2019, 08:07 PM | #1 |
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+20HP / +14.75 ft/lbs TQ midrange with BMS intake. For real or BS?
Most people say intakes don't add any performance on our cars. Well this sure begs to differ. Dyno back to back stock vs BMS.
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06-22-2019, 09:18 PM | #3 |
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Real numbers bcuz everybody drives with hood open Like that...lol
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06-24-2019, 12:42 AM | #5 |
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Even if the gains are just maybe 5-10hp isn't it a relatively cheap and safe way to give that increase?
I'm considering a stage one tune in comparison that is quite a lot more expensive although the gains with the tune are definitely more "guaranteed".. |
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06-24-2019, 02:48 AM | #6 | |
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N55 is really limited by the stock turbo. It struggles in the upper RPM range because of the smaller turbo. The S55 stock intake is quite similar I think and those make a lot more power, because of the turbo change. Even a tune alone without other mods might not get you 20 HP across the entire range, but I bet a tune is more effective than this intake. |
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06-24-2019, 08:36 AM | #7 |
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Stick with the stock paper filter. Intakes on turbocharged cars achieves nothing make noise and fatten the wallets of distributors/manufactures of intakes. I'm actually surprised in 2019 this is still a thing.
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06-24-2019, 08:48 AM | #8 |
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This video runs a stock air box then an aftermarket one for a relatively large increase in hp/tq midrange. So unless the numbers are made up what is the explanation here? It’s a controlled before/after comparison.
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06-24-2019, 01:15 PM | #9 | |
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On the track, where you spend a lot of time around high in the RPM range I suppose the performance increase would be a wash. You'd gain time in corners where your gearing lands you below 4k but lose time in straights when you'd usually be running to red line. The dyno graph would suggest you'd want to short shift at around 6.25k RPM (I think, the video is a bit blurry). |
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06-25-2019, 07:07 AM | #11 |
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As others have noted, a dyno test with the hood open does not replicate what happens in the real world with the intake sucking in hot air from the engine compartment. That's thought #1.
Thought #2 is that BMW engineers do things for a reason. They are not dummies. Maybe that reason is something that you don't care about (intake noise, engine longevity, etc.) but they just don't do things a certain way for the heck of it. Thought #3 is the most important, and I'll explain that with an anecdote: Many years ago I was at the track talking to a guy who worked for Ford SVT. He had worked on the Lightning project, IIRC. I asked what he thought about K&N and other such filters, and why they are not OE. He replied that Ford [and all manufacturers] spend millions of dollars to get the maximum horsepower out of their engines. "If a different filter would make a difference, don't you think they would be using it?" In my mind, the same applies to all of these "cold air intakes" which are, if you think about it at all, are actually the opposite. What they are is $12 of plastic that is sold for hundreds of dollars, making some guy very, very happy.
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06-25-2019, 02:33 PM | #12 | |
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To be more specific though, the engineers probably want to balance the intake characteristics - some intakes perform better at low flow while others perform better at high flow. Most likely they will design an intake to complement the engine. Aftermarket intakes can potentially change that characteristic, which could be good if it fits your use-case. |
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06-25-2019, 05:29 PM | #13 | ||
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Overall I agree with you, however I think you forgot that those engineers also work within strict budget and time constraints. Perhaps they could design a better intake but they simply lacked the budget or were under such time crunch that they had to use the off the shelf 235i part. Of course this is pure speculation on my part, but it could be a reason. Do we have other videos or forum members with before and after dyno runs with just an intake? |
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06-25-2019, 06:06 PM | #14 |
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Market segmentation is a more likely reason for a given intake/filter being used than the lack of development budget or time.
But, they also have to keep it quiet. So they put restrictors in the airbox to minimise intake noise. I would note that on the 1st generation Mini Cooper S, the use of the Works airbox led to quite a bit more intake noise (particularly over 4k rpm), but also - apparently - a 20bhp increase over stock. All the other intake pipework was standard, so that suggests a cone filter around a tapered intake tube is more effective than a panel filter across the middle of the same airbox volume. But as mentioned earlier, within no restrictors on the intake of the box to minimise noise... Last edited by M Fifty; 06-25-2019 at 06:08 PM.. Reason: Spool Chucker pro bells |
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06-25-2019, 07:10 PM | #15 | |
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06-26-2019, 04:18 PM | #17 |
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06-29-2019, 09:15 PM | #18 |
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While it looks on those plots that midrange HP is more, not sure I agree with his finding that there is any increase at all in Peak. Matter of fact, above 5700 rpms, it looks here its losing a few HP and ft lbs to stock.. Its acacemic though, as overall, the gains are greater than the loss by a not insignificant amount on those plots. Doesnt mean these gains will translate fully to the road, with hood down, and other uncontrolled differences.
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07-02-2019, 09:00 AM | #20 |
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Ha ha ha. Yes I have. I have wasted a lot of money in the past on fluff mods like this but it doesn't mean people have to continue the cycle.
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07-08-2019, 11:50 AM | #21 |
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Yes you do get gains from open air intakes, that being said get it for the sound. The gains are for a short period of RPM that most of the time you wont even feel it.
If you are looking for power there are a lot of mods which offers more value, you can always add the intake as the last step.
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