PROcede V2 and boost question

e.n335 · 01-08-2008, 12:17 PM

Why is the PROcede V2 boost curve different ( e.g. boost tapering down ) in different gears when I accelerate with the pedal floored ? Sometimes in high gears the PROcede V2 seems to not taper down boost at all. Could the engine be hurt from 13.5 - 14 psi boost @ 6000+ rpm ?

Thanks,
Eugen

O-cha · 01-08-2008, 12:20 PM

I'd be more worried about the turbo then the engine if anything. As for high gears do you mean 1st 2nd or 3rd 4th.

e.n335 · 01-08-2008, 12:21 PM

^ gears 4,5,6

Kbueno · 01-08-2008, 12:25 PM

Can you post some logs, my boost tapers off after 5500 rpm

e.n335 · 01-08-2008, 12:29 PM

Quote:

Originally Posted by 335lvr

Can you post some logs, my boost tapers off after 5500 rpm

What is your highest boost @ 6900 rpm ?

e.n335 · 01-08-2008, 12:38 PM

Quote:

Originally Posted by 335lvr

Can you post some logs, my boost tapers off after 5500 rpm

I found a good example with the latest map but not that high boost numbers, 12.9 psi. Isn't this a bit high for 6000 rpm ? And you can trust me, I have seen 14 psi @ 6000 rpm as well already.

In 3rd gear, boost is 11.2 psi @ 6075 rpm. In 4th gear, boost is 12.9 psi @ 6075 rpm.

The boost in 3rd gear is lower than in 4th gear. Shiv advices his customers to fine-tune user torque in 3rd gear.

Sniz · 01-08-2008, 12:49 PM

I'm seeing lower boost in 3rd gear as well. Boost in 4th gear seems to be stable and not dropping.

As of right now though I wouldnt use my car as a data point for V2 boost levels.

O-cha · 01-08-2008, 12:59 PM

The difference between gears is because turbos are more efficient in higher gears. More engine load, more exhaust longer pull ETC. It could also have to do with IATs climbing (again since the pulls are longer) and the ECU adjusting boost up to compensate.

e.n335 · 01-08-2008, 01:04 PM

Quote:

Originally Posted by O-cha

The difference between gears is because turbos are more efficient in higher gears. More engine load, more exhaust longer pull ETC. It could also have to do with IATs climbing (again since the pulls are longer) and the ECU adjusting boost up to compensate.

Understood. Thank you !

Now, could it hurt the engine to run 14 psi @ 6000 rpm ?

Sniz · 01-08-2008, 01:07 PM

Quote:

Originally Posted by O-cha

The difference between gears is because turbos are more efficient in higher gears. More engine load, more exhaust longer pull ETC. It could also have to do with IATs climbing (again since the pulls are longer) and the ECU adjusting boost up to compensate.

sounds reasonable to me

bmwzimmer · 01-08-2008, 01:08 PM

I have the EXACT same issue with 3rd gear boost drop. 4th gear is very flat.

e.n335 · 01-08-2008, 01:10 PM

Quote:

Originally Posted by bmwzimmer

I have the EXACT same issue with 3rd gear boost drop. 4th gear is very flat.

Could it hurt the engine to run 14 psi @ 6000 rpm ?

O-cha · 01-08-2008, 01:17 PM

Quote:

Originally Posted by e.n335

Now, is it bad for the engine to run 14 psi @ 6000 rpm ?

Quote:

Originally Posted by O-cha

I'd be more worried about the turbo then the engine if anything.

Engines fine, you're not putting out anywhere near the amount of torque as you are down low, yes you can't really say if it makes the torque at lower engine speeds its ok to make the same at high speeds, but it gives you a good idea of what the engine can likely handle. You would need to worry about how much the turbos need to spin to put out that pressure or about detonation or excessive timing retard and again if anything.

e.n335 · 01-08-2008, 01:21 PM

Quote:

Originally Posted by O-cha

Engines fine, you're not putting out anywhere near the amount of torque as you are down low, yes you can't really say if it makes the torque at lower engine speeds its ok to make the same at high speeds, but it gives you a good idea of what the engine can likely handle. You would need to worry about how much the turbos need to spin to put out that pressure or about detonation or excessive timing retard and again if anything.

Thanks a lot !

If anything, the turbo's will be the price to pay it will be a good reason for exchanging / upgrading them

.

bmwzimmer · 01-08-2008, 01:22 PM

I remember someone saying that the Turbos are past their efficiency range so 15PSI at 6-7Krpm doesn't make much more HP than 12PSI at 6-7K rpm.

OpenFlash · 01-08-2008, 01:38 PM

In higher gears, you are seeing higher intake charge temps. This increase in IAT is what raising boost pressure. This is one reason that cars with good intercooler upgrades will see less boost than cars with stock intercoolers. This is also the reason that you see less boost in cold ambient conditions than you do in warm conditions. Until you do a run up through the gears, of course. At which point, IAT is substantially higher than ambient temps.

Shiv

e.n335 · 01-08-2008, 01:46 PM

Thank you Shiv.

01-08-2008, 12:17 PM	#1
e.n335 Moderator 270 Rep 4,481 Posts Drives: e93 ///M3 DCT, 07/2009 Join Date: Feb 2007 Location: Switzerland, ZH iTrader: (0)	PROcede V2 and boost question Why is the PROcede V2 boost curve different ( e.g. boost tapering down ) in different gears when I accelerate with the pedal floored ? Sometimes in high gears the PROcede V2 seems to not taper down boost at all. Could the engine be hurt from 13.5 - 14 psi boost @ 6000+ rpm ? Thanks, Eugen
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01-08-2008, 12:20 PM	#2
O-cha Brigadier General 218 Rep 4,726 Posts Drives: Mcoupe Join Date: Oct 2007 Location: In front of you iTrader: (2)	I'd be more worried about the turbo then the engine if anything. As for high gears do you mean 1st 2nd or 3rd 4th. __________________
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01-08-2008, 12:21 PM	#3
e.n335 Moderator 270 Rep 4,481 Posts Drives: e93 ///M3 DCT, 07/2009 Join Date: Feb 2007 Location: Switzerland, ZH iTrader: (0)	^ gears 4,5,6
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01-08-2008, 12:25 PM	#4
Kbueno Lieutenant Colonel 99 Rep 1,712 Posts Drives: F82 Join Date: Jan 2007 Location: California iTrader: (5)	Can you post some logs, my boost tapers off after 5500 rpm
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01-08-2008, 12:49 PM	#7
Sniz Lieutenant General 654 Rep 10,587 Posts Drives: e92 335 - gone // e36 M3 turbo Join Date: Mar 2007 Location: Ellicott City, MD iTrader: (1)	I'm seeing lower boost in 3rd gear as well. Boost in 4th gear seems to be stable and not dropping. As of right now though I wouldnt use my car as a data point for V2 boost levels. __________________
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01-08-2008, 12:59 PM	#8
O-cha Brigadier General 218 Rep 4,726 Posts Drives: Mcoupe Join Date: Oct 2007 Location: In front of you iTrader: (2)	The difference between gears is because turbos are more efficient in higher gears. More engine load, more exhaust longer pull ETC. It could also have to do with IATs climbing (again since the pulls are longer) and the ECU adjusting boost up to compensate. __________________
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01-08-2008, 01:08 PM	#11
bmwzimmer Major 35 Rep 1,084 Posts Drives: 335 Join Date: Jan 2007 Location: 91 octane states iTrader: (0)	I have the EXACT same issue with 3rd gear boost drop. 4th gear is very flat.
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01-08-2008, 01:22 PM	#15
bmwzimmer Major 35 Rep 1,084 Posts Drives: 335 Join Date: Jan 2007 Location: 91 octane states iTrader: (0)	I remember someone saying that the Turbos are past their efficiency range so 15PSI at 6-7Krpm doesn't make much more HP than 12PSI at 6-7K rpm.
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01-08-2008, 01:38 PM	#16
OpenFlash 1737 Rep 17,960 Posts Drives: A Lot Join Date: Sep 2006 Location: SF Bay, CA iTrader: (0) Garage List 2018 Ducati Panigal ... [0.00] 2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00]	In higher gears, you are seeing higher intake charge temps. This increase in IAT is what raising boost pressure. This is one reason that cars with good intercooler upgrades will see less boost than cars with stock intercoolers. This is also the reason that you see less boost in cold ambient conditions than you do in warm conditions. Until you do a run up through the gears, of course. At which point, IAT is substantially higher than ambient temps. Shiv
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01-08-2008, 01:46 PM	#17
e.n335 Moderator 270 Rep 4,481 Posts Drives: e93 ///M3 DCT, 07/2009 Join Date: Feb 2007 Location: Switzerland, ZH iTrader: (0)	Thank you Shiv.
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