Latest information on DP Fix...

N54Society · 10-29-2018, 01:41 AM

Anyone know if you can leave the downpipe fix installed and active on a car with MHD? 2010 N54.

Thanks

Koolsilver · 10-29-2018, 11:21 AM

It has been asked but the answer is no you need to remove with or without mhd. It is only ment to be installed temporarily.

ryan.ferguson · 10-29-2018, 11:39 AM

Do not leave it installed, it'll throw off your lambda tables.

N54Society · 10-29-2018, 12:31 PM

Quote:

Originally Posted by Koolsilver

It has been asked but the answer is no you need to remove with or without mhd. It is only ment to be installed temporarily.

Quote:

Originally Posted by ryan.ferguson

Do not leave it installed, it'll throw off your lambda tables.

Thanks guys! I'm not new to the N54 scene but "back in the day", we had to remove it due to the reasons you guys listed. It sounds like things are still the same on that front.

Thanks

Jklad · 10-29-2018, 12:32 PM

This is what everyone says, though I have mine dialed to the 0 (off) position and everything's been fine.

N54Society · 10-29-2018, 12:34 PM

Quote:

Originally Posted by Jklad

This is what everyone says, though I have mine dialed to the 0 (off) position and everything's been fine.

And does your O2 sensor stay "ready"?

Jklad · 10-29-2018, 05:34 PM

Quote:

Originally Posted by vbp6us

Quote:

Originally Posted by Jklad

This is what everyone says, though I have mine dialed to the 0 (off) position and everything's been fine.

And does your O2 sensor stay "ready"?

No dash lights if that's what you mean, I haven't checked readiness indicators since I passed emissions. People on here have told me to remove it still, but my mechanic says it's fine to leave it on.

IllSic_Design · 10-29-2018, 06:37 PM

Quote:

Originally Posted by Jklad

No dash lights if that's what you mean, I haven't checked readiness indicators since I passed emissions. People on here have told me to remove it still, but my mechanic says it's fine to leave it on.

If you actually take the time to read how the dp fix works then you would figure out that it is going to do what people on here have said about messing up fuel trims. You might not "notice" anything but your car isn't going to be running fully optimal.

ryan.ferguson · 10-30-2018, 10:18 AM

^+1 on this. It's not hard to install/uninstall, don't leave it on.

N54rsenal · 11-01-2018, 09:56 PM

Why not just set it to zero then?

I have a 2010 335i n54 w MHDS2+93 and I have catless DP's and got shadow CEL codes 29F4/29F5 Catalytic-converter coversion/2.
I installed the VRSF Catless Downpipe Fix and it's on setting #6 and no related codes yet.

I'm still tuned and Catalyst is still showing as incomplete. Am I doing the test properly I haven't reset any cels yet to see if it shows up in the drive cycle im just over a 100 miles now.
Also in MHD settings should I select stock or catless downpipes for testing?

Jklad · 11-21-2018, 12:46 PM

Quote:

Originally Posted by IllSic_Design

If you actually take the time to read how the dp fix works then you would figure out that it is going to do what people on here have said about messing up fuel trims. You might not "notice" anything but your car isn't going to be running fully optimal.

I've spent some time searching on here and google to learn more about how it works, but i'm not getting good info.
The install document says that the '11 pm setting will disable the dp fix altogether'. If set to 11pm, is it still in some way interfering or altering signals? Genuinely interested in learning as i'd like to know more, and I think this would be helpful to others as well.

MILLER335I · 11-22-2018, 07:58 AM

There is a DIY here on a quick disconnect dp fix mod that solves any issues. Better to be safe than sorry!

10-29-2018, 01:41 AM	#1
N54Society Major Private First Class 449 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	Latest information on DP Fix... Anyone know if you can leave the downpipe fix installed and active on a car with MHD? 2010 N54. Thanks __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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10-29-2018, 11:21 AM	#2
Koolsilver Private First Class 65 Rep 175 Posts Drives: 335i Join Date: Jun 2012 Location: Sacramento iTrader: (2)	It has been asked but the answer is no you need to remove with or without mhd. It is only ment to be installed temporarily.
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10-29-2018, 11:39 AM	#3
ryan.ferguson Private First Class 21 Rep 130 Posts Drives: 2013 335is Coupe DCT Join Date: May 2011 Location: NoVa iTrader: (1) Garage List 2008 BMW 135i Coupe [0.00]	Do not leave it installed, it'll throw off your lambda tables. __________________ Current: 2013 335is Coupe DCT Black/Red Previous: 2008 135i Coupe Montego Blue "Speed never killed anyone its very important to get that straight, Speed has never killed a soul. Suddenly becoming stationary thats what gets people." - Jeremy Clarkson
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10-29-2018, 12:32 PM	#5
Jklad Lieutenant Colonel 421 Rep 1,643 Posts Drives: 2007 335i Coupe Join Date: Nov 2010 Location: Palatine, IL iTrader: (0)	This is what everyone says, though I have mine dialed to the 0 (off) position and everything's been fine. __________________ 2007 E92 335i MT
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10-30-2018, 10:18 AM	#9
ryan.ferguson Private First Class 21 Rep 130 Posts Drives: 2013 335is Coupe DCT Join Date: May 2011 Location: NoVa iTrader: (1) Garage List 2008 BMW 135i Coupe [0.00]	^+1 on this. It's not hard to install/uninstall, don't leave it on. __________________ Current: 2013 335is Coupe DCT Black/Red Previous: 2008 135i Coupe Montego Blue "Speed never killed anyone its very important to get that straight, Speed has never killed a soul. Suddenly becoming stationary thats what gets people." - Jeremy Clarkson
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11-01-2018, 09:56 PM	#10
N54rsenal Enlisted Member 6 Rep 36 Posts Drives: 2010 335i M Sport LCI Join Date: Oct 2018 Location: Chicago iTrader: (0)	Why not just set it to zero then? I have a 2010 335i n54 w MHDS2+93 and I have catless DP's and got shadow CEL codes 29F4/29F5 Catalytic-converter coversion/2. I installed the VRSF Catless Downpipe Fix and it's on setting #6 and no related codes yet. I'm still tuned and Catalyst is still showing as incomplete. Am I doing the test properly I haven't reset any cels yet to see if it shows up in the drive cycle im just over a 100 miles now. Also in MHD settings should I select stock or catless downpipes for testing?
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11-22-2018, 07:58 AM	#12
MILLER335I Captain 68 Rep 763 Posts Drives: BMW E90 Dinan stage 3 335I Join Date: Mar 2017 Location: Peoples Republic of California iTrader: (11)	There is a DIY here on a quick disconnect dp fix mod that solves any issues. Better to be safe than sorry! __________________ 2007 E90 335i N54 Montego blue with grey Dakota leather interior
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