OFT VANOS Shift

Aerotest · 11-23-2013, 08:02 PM

I am running the OFT Stage 1 tune and recently added a Mr. 5 intake setup. I had the boost differential around 4100 RPM in previous data logs, but it all but vanished after I had my valves cleaned. With the colder weather (41F) it seems the boost differential with the VANOS shifts is more pronounced and is causing a significant throttle closure (see data log at ~4100 RPM). I know this issue is caused by the VANOS creating a shift in VE (Shiv confirmed). Anybody have any recommendations on how to smooth the VANOS tables to prevent this boost differential?

Tks

E30 Racer · 11-23-2013, 09:26 PM

What firmware?

Aerotest · 11-23-2013, 10:09 PM

1.17

E30 Racer · 11-23-2013, 10:27 PM

Not sure what that is. What ROM are you using (e.g., IKCOS).

AWTT335i · 11-24-2013, 12:45 AM

I'm not sure OFT has the proper parameters available to datalog to fix it. You could try reverting to oem vanos, might fix it.

Aerotest · 11-24-2013, 07:13 AM

I8AOS

Aerotest · 11-24-2013, 07:17 AM

I am going look at the 3d maps today. After doing some reading I think issue is the VANOS becomes active at that point, VE changes, and the ability fornthe engine to injest air goes down creating a temp overboost condition. Having RPM and load I hope to smooth some of that table to eliminate. We dont have access to all the VANOS control in comparison tonthe E46 guys. Every OFT log I have seen has this little departure so I know it isnt my car.

Aerotest · 11-24-2013, 07:22 AM

Quote:

Originally Posted by AWTT335i

I'm not sure OFT has the proper parameters available to datalog to fix it. You could try reverting to oem vanos, might fix it.

Agreed. If we could data log Vanos activity this would be an easy fix.

11-23-2013, 08:02 PM	#1
Aerotest First Lieutenant 15 Rep 315 Posts Drives: 2008 E90 335i 6MT Join Date: Aug 2013 Location: Yo mama iTrader: (0)	OFT VANOS Shift I am running the OFT Stage 1 tune and recently added a Mr. 5 intake setup. I had the boost differential around 4100 RPM in previous data logs, but it all but vanished after I had my valves cleaned. With the colder weather (41F) it seems the boost differential with the VANOS shifts is more pronounced and is causing a significant throttle closure (see data log at ~4100 RPM). I know this issue is caused by the VANOS creating a shift in VE (Shiv confirmed). Anybody have any recommendations on how to smooth the VANOS tables to prevent this boost differential? Tks Attached Images
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11-23-2013, 09:26 PM	#2
E30 Racer Captain 223 Rep 696 Posts Drives: '11 1M, '09 335i M Sport Join Date: Aug 2011 Location: Ohio iTrader: (2)	What firmware?
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11-23-2013, 10:09 PM	#3
Aerotest First Lieutenant 15 Rep 315 Posts Drives: 2008 E90 335i 6MT Join Date: Aug 2013 Location: Yo mama iTrader: (0)	1.17
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11-23-2013, 10:27 PM	#4
E30 Racer Captain 223 Rep 696 Posts Drives: '11 1M, '09 335i M Sport Join Date: Aug 2011 Location: Ohio iTrader: (2)	Not sure what that is. What ROM are you using (e.g., IKCOS).
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11-24-2013, 12:45 AM	#5
AWTT335i First Lieutenant 12 Rep 368 Posts Drives: E90 M3 Join Date: Aug 2013 Location: United states iTrader: (0)	I'm not sure OFT has the proper parameters available to datalog to fix it. You could try reverting to oem vanos, might fix it.
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11-24-2013, 07:13 AM	#6
Aerotest First Lieutenant 15 Rep 315 Posts Drives: 2008 E90 335i 6MT Join Date: Aug 2013 Location: Yo mama iTrader: (0)	I8AOS
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11-24-2013, 07:17 AM	#7
Aerotest First Lieutenant 15 Rep 315 Posts Drives: 2008 E90 335i 6MT Join Date: Aug 2013 Location: Yo mama iTrader: (0)	I am going look at the 3d maps today. After doing some reading I think issue is the VANOS becomes active at that point, VE changes, and the ability fornthe engine to injest air goes down creating a temp overboost condition. Having RPM and load I hope to smooth some of that table to eliminate. We dont have access to all the VANOS control in comparison tonthe E46 guys. Every OFT log I have seen has this little departure so I know it isnt my car.
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