Stock Boost Levels

13M5F10 · 08-23-2015, 05:46 PM

Anyone know what the stock boots level is at WOT ?

13M5F10 · 08-24-2015, 01:47 PM

58 views and no one has the answer

Igor_M5 · 08-24-2015, 02:31 PM

Around 17.5/18 PSI (1.2 Bar)

lfelunden · 08-24-2015, 03:43 PM

Depends, 560HP cars run 15-16 psi, those with competition package run around 17.2-18 psi

13M5F10 · 08-24-2015, 05:38 PM

Thanks guys

TheHouseWon · 04-24-2016, 07:45 PM

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.

lemetier · 04-24-2016, 09:20 PM

Quote:

Originally Posted by TheHouseWon

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.

It depends...it's still tied to Absolute Manifold Pressure. It will run more or less under different demands and different atmospheric conditions. There are also a few different turbo/wastegate, fuel rail, fuel injector, exhaust manifold, valve covers, and 2 different DME Software Versions. Certain build dates have various combinations of these revisions which will show different mapping results. The most recent cars (1.16 and newer) are in a way a sort of unofficial S63TU1.

allmotor_2000 · 04-24-2016, 10:04 PM

Quote:

Originally Posted by TheHouseWon

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.

No - the DME has maps upto 22psi. The requested target (torque) can be anything upto that level... not requested in boost pressure, rather nm torque. The DME will provide upto 22psi to achieve the torque target. In most cases, the car can support 560-580hp with 15-17psi. When you get a flash, you target a high torque request, so that you pretty much request 22psi all the time.

The number is 22.7psi to be exact.

TheHouseWon · 04-24-2016, 10:12 PM

Quote:

Originally Posted by allmotor_2000

No - the DME has maps upto 22psi. The requested target (torque) can be anything upto that level... not requested in boost pressure, rather nm torque. The DME will provide upto 22psi to achieve the torque target. In most cases, the car can support 560-580hp with 15-17psi. When you get a flash, you target a high torque request, so that you pretty much request 22psi all the time.

The number is 22.7psi to be exact.

Great info, thx.

How are tuners getting more than 22psi w/o jb4/bcm?

allmotor_2000 · 04-24-2016, 11:11 PM

Quote:

Originally Posted by TheHouseWon

Great info, thx.

How are tuners getting more than 22psi w/o jb4/bcm?

1. Flash does MAP scaling but it is not 100% working well yet. The stock TMAP at the intake manifold is swapped to a 3.5bar one and the flash does some math to scale boost. To date it still uses the a ratio of the existing maps rather than creating a custom map for those values
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

JNoSol · 04-25-2016, 09:03 AM

Quote:

Originally Posted by Igor@ONEighty

Around 17.5/18 PSI (1.2 Bar)

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.

rif75 · 08-21-2016, 04:51 AM

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?

Msizzle · 08-22-2016, 10:17 PM

Quote:

Originally Posted by rif75

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?

no stock is 15-16, i have a boost gauge and have verified it plenty of times

boots · 08-23-2016, 09:08 AM

Wow. So many different answers.

lunden · 08-23-2016, 11:05 AM

Quote:

Originally Posted by boots

Wow. So many different answers.

Stock boost on NON CP is aroun 15-16 psi, CP is usually around 17.2psi

8600RPM · 09-06-2016, 10:55 AM

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

08-23-2015, 05:46 PM	#1
13M5F10 Hide! My wife's coming! 812 Rep 2,816 Posts Drives: 2013 BMW M5 \| MSR Stage 3 Join Date: Jun 2015 Location: Las Colinas, TX iTrader: (5)	Stock Boost Levels Anyone know what the stock boots level is at WOT ? __________________ * SOLD * 2013 BMW M5 \| Space Grey \| MSR Stage 3 Tune \| Catless Downpipes \| MSR Intake and Charge Pipes \| MSR Exhaust (Prototype) \| Vorsteiner Rear Diffuser \| RW Carbon Front Lip \| RW Carbon Trunk Spoiler\| Vorsteiner VS-310 Forged Wheels \| Escort 9500CI w/Laser Jammers
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08-24-2015, 01:47 PM	#2
13M5F10 Hide! My wife's coming! 812 Rep 2,816 Posts Drives: 2013 BMW M5 \| MSR Stage 3 Join Date: Jun 2015 Location: Las Colinas, TX iTrader: (5)	58 views and no one has the answer __________________ * SOLD * 2013 BMW M5 \| Space Grey \| MSR Stage 3 Tune \| Catless Downpipes \| MSR Intake and Charge Pipes \| MSR Exhaust (Prototype) \| Vorsteiner Rear Diffuser \| RW Carbon Front Lip \| RW Carbon Trunk Spoiler\| Vorsteiner VS-310 Forged Wheels \| Escort 9500CI w/Laser Jammers
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08-24-2015, 02:31 PM	#3
Igor_M5 2134 Rep 1,834 Posts Drives: Many, BMW. Join Date: Aug 2007 Location: New York City iTrader: (10) Garage List 2007;2013 E91 335is [10.00]	Around 17.5/18 PSI (1.2 Bar)
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08-24-2015, 03:43 PM	#4
lfelunden Banned 60 Rep 643 Posts Drives: BMW M5 F10 Join Date: Aug 2011 Location: German Autobahn iTrader: (0) Garage List 2013 BMW M5 [0.00] 2011 Alpina B3S Bit ... [9.50] 2010 Alpina B3 Biturbo [10.00] 2009 Alpina B5S [10.00]	Depends, 560HP cars run 15-16 psi, those with competition package run around 17.2-18 psi
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08-24-2015, 05:38 PM	#5
13M5F10 Hide! My wife's coming! 812 Rep 2,816 Posts Drives: 2013 BMW M5 \| MSR Stage 3 Join Date: Jun 2015 Location: Las Colinas, TX iTrader: (5)	Thanks guys
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04-24-2016, 07:45 PM	#6
TheHouseWon Colonel 644 Rep 2,039 Posts Drives: 2013 M5 Join Date: Nov 2015 Location: SoCal iTrader: (10)	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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08-21-2016, 04:51 AM	#12
rif75 Lieutenant 64 Rep 412 Posts Drives: BMW M4 LCI ZCP and BMW M5 f10 Join Date: Jan 2014 Location: Paris iTrader: (0)	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? __________________ BMW M5 ZCP and M4 ZCP. BMW 540i G30 stage 2 with KW street confort, Wagner DP, Remus catback, M sport brakes 395mm front and 385mm rear. MHD tune.
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08-23-2016, 09:08 AM	#14
boots Curve Thrasher 623 Rep 3,773 Posts Drives: 2013 Bmw m5..White/Blk. Join Date: Nov 2012 Location: Cypress Tx iTrader: (0)	Wow. So many different answers.
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09-06-2016, 10:55 AM	#16
8600RPM Lieutenant Colonel 657 Rep 1,749 Posts Drives: e92 m3 Join Date: Oct 2014 Location: AZ iTrader: (0)	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
	Appreciate 1 FSociety3811.50 Quote

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