Dyno after Euro Headers

kav · 04-14-2010, 01:58 PM

Before and after Euro OEM catless headers.
Other mods: RPI intake scoop and filter, SS X pipe, SS Powerloop exhaust, CDV.

I'm surprised that the HP increase is only above 6000 rpm.

inTgr8r · 04-14-2010, 02:19 PM

Engine mgnt may be doing funny things due to the sensor issue?

kav · 04-14-2010, 02:25 PM

Quote:

Originally Posted by inTgr8r

Engine mgnt may be doing funny things due to the sensor issue?

That is possible. I had a look under the car and could not see anything obviously wrong with the wiring or sensors..

So next step is the ECU or O-Cha's fix for the CELs.

DarkstarZero · 04-14-2010, 04:05 PM

I think the issue might be like what happens when you have an o2 sensor failure, the engine runs rich. O-Cha's fix is a simulator that sends the ECU a normal signal so it's not trying to compensate. The ESS tune turns off the sensor which does the same thing.

I could also be completely wrong... I'm just guessing.

Thisisdudewhoru · 04-14-2010, 04:41 PM

I've never seen stock or euro headers. But is the only difference between them cats and no cats? Cause if they have exact same bends and diameters, the power gain only above 6000 sounds about right as I would think thats when the motor starts producing enough exhaust gasses to make the catted/stock headers restrictive...Just my guess though.

DarkstarZero · 04-14-2010, 05:02 PM

These are the dyno results pal got after installing his euro headers:

You can see his thread here: http://www.zpost.com/forums/showthre...t=euro+headers Looks like either something's wrong with your car or something's wrong with the dyno.

Zed4M26 · 04-26-2010, 10:33 AM

I think Pal is running a complete factory exhaust set up aside from the headers. Kav is probably losing some power at low rpms due to the loss of backpressure with the race cans and x pipe. I have the csl headers with ss section 1, x pipe and race cans. I have not dynoed yet but I can feel all the power come on late around 5K.

inTgr8r · 04-26-2010, 08:11 PM

Unless he has changed, Kav has powerloops, not race.

pokeybritches · 04-27-2010, 05:04 AM

Looks like your max power was falling off around 7k rpm before the headers.

04-14-2010, 01:58 PM	#1
kav Lieutenant 49 Rep 401 Posts Drives: Z4M Join Date: Oct 2007 Location: Canada iTrader: (1)	Dyno after Euro Headers Before and after Euro OEM catless headers. Other mods: RPI intake scoop and filter, SS X pipe, SS Powerloop exhaust, CDV. I'm surprised that the HP increase is only above 6000 rpm.
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04-14-2010, 02:19 PM	#2
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	Engine mgnt may be doing funny things due to the sensor issue?
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04-14-2010, 04:05 PM	#4
DarkstarZero Lieutenant Colonel 1014 Rep 1,721 Posts Drives: Daytona 95 M3, X7 M50, e92 M3, Join Date: Nov 2007 Location: Washington DC iTrader: (6)	I think the issue might be like what happens when you have an o2 sensor failure, the engine runs rich. O-Cha's fix is a simulator that sends the ECU a normal signal so it's not trying to compensate. The ESS tune turns off the sensor which does the same thing. I could also be completely wrong... I'm just guessing. __________________ BMW CCA Track Instructor Join to win a M School Day at the Performance Center! Enter Referral ID: 420186
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04-14-2010, 04:41 PM	#5
Thisisdudewhoru Captain 82 Rep 698 Posts Drives: 16 BSM 340i Join Date: Mar 2010 Location: 423 iTrader: (1)	I've never seen stock or euro headers. But is the only difference between them cats and no cats? Cause if they have exact same bends and diameters, the power gain only above 6000 sounds about right as I would think thats when the motor starts producing enough exhaust gasses to make the catted/stock headers restrictive...Just my guess though. __________________ '16 BSM 340i M Sport + Track Pack.:.M Perf Exhaust.:.Polished BBS RS-GT.:.JB4.:.BMS Intake.:.H&R Sport.:.
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04-14-2010, 05:02 PM	#6
DarkstarZero Lieutenant Colonel 1014 Rep 1,721 Posts Drives: Daytona 95 M3, X7 M50, e92 M3, Join Date: Nov 2007 Location: Washington DC iTrader: (6)	These are the dyno results pal got after installing his euro headers: You can see his thread here: http://www.zpost.com/forums/showthre...t=euro+headers Looks like either something's wrong with your car or something's wrong with the dyno. __________________ BMW CCA Track Instructor Join to win a M School Day at the Performance Center! Enter Referral ID: 420186
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04-26-2010, 10:33 AM	#7
Zed4M26 Second Lieutenant 31 Rep 208 Posts Drives: 2007 M Coupe Join Date: May 2008 Location: Long Island, NY iTrader: (4)	I think Pal is running a complete factory exhaust set up aside from the headers. Kav is probably losing some power at low rpms due to the loss of backpressure with the race cans and x pipe. I have the csl headers with ss section 1, x pipe and race cans. I have not dynoed yet but I can feel all the power come on late around 5K. __________________ BONE STOCK
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04-26-2010, 08:11 PM	#8
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	Unless he has changed, Kav has powerloops, not race. __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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04-27-2010, 05:04 AM	#9
pokeybritches Colonel 479 Rep 2,782 Posts Drives: ESS/G-Power Z4M, VF Z4, 996tt Join Date: Sep 2009 Location: Los Angeles iTrader: (12) Garage List 2006 BMW Z4M [10.00] 2006 BMW Z4M [8.50] 2003 BMW Z4 3.0i [9.00]	Looks like your max power was falling off around 7k rpm before the headers.
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