08-23-2015, 05:46 PM | #1 |
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Stock Boost Levels
Anyone know what the stock boots level is at WOT ?
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08-24-2015, 01:47 PM | #2 |
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58 views and no one has the answer
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08-24-2015, 02:31 PM | #3 |
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Around 17.5/18 PSI (1.2 Bar)
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08-24-2015, 03:43 PM | #4 |
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Depends, 560HP cars run 15-16 psi, those with competition package run around 17.2-18 psi
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04-24-2016, 07:45 PM | #6 |
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Found this and it contradicts the 15-16 psi quote. Under WOT or heavy load, max boost is apparently 1.5 bar or 22psi (the magic number that requires JB4/BCM, same number a lot of tuners can't go passed).
http://www.bimmerfest.com/forums/sho...d.php?t=842484 EDIT: the reason I brought this up was to see if we can read boost levels after a couple of runs on e-sys. Somehow when I submitted this post it didn't include the e-sys inquiry. Last edited by TheHouseWon; 04-24-2016 at 08:32 PM.. |
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04-24-2016, 09:20 PM | #7 | |
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Quote:
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04-24-2016, 10:04 PM | #8 | |
F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph
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The number is 22.7psi to be exact. |
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04-24-2016, 10:12 PM | #9 | |
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How are tuners getting more than 22psi w/o jb4/bcm? |
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04-24-2016, 11:11 PM | #10 | |
F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph
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2. JB4+BCM actually controls the wastegates directly to target any boost value. The DME believes it is at its max programmed value. You want to keep that delta small for fueling and other purposes |
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04-25-2016, 09:03 AM | #11 |
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http://f10.m5post.com/forums/showthread.php?t=548345
Actually, stock S63Tu's maximum pressure is 1.5 bar = 22psi. Unless you are referring to normal boost, then yes around 18psi.
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08-21-2016, 04:51 AM | #12 |
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Sorry but I don't understand, the boost with map 1 JB4 is 18psi and the sotck boost is 18 psi too? Do I miss something?
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08-22-2016, 10:17 PM | #13 |
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09-06-2016, 10:55 AM | #16 |
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All modern bmw turbo cars,and,and almost any car maker adjusts boost based on temp, elevation and essential air density. It always strives to make target hp. On a cold day at sea level a stock car perhaps hits 14 max boost. A hot day at elevation a car may hit 18.
Jb4 stage 1 and similar Piffy backs tap into this window and therefore essentially will make a car see 18 boost even if its,cold and normally would be 15. A hot day you have less headroom |
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