Question about Driving around w/ CEL

Money2536 · 11-19-2011, 06:22 AM

I just bought bought a used Dinan Middle Racing Exhaust. I think I already know the answer to this question. Is there any issue driving around for a few weeks with CEL light prior to getting a tune other than an annoying light on my dash? I assume the DME will adapt to the loss of the cats and simply indicate there is issue.

Thoughts?

///M Ryder · 11-19-2011, 06:12 PM

You should have no problem. The Dinan tune will eliminate the CEL.........Phil

Money2536 · 11-20-2011, 08:35 AM

Maybe I didn't make myself clear. I'm going to put the mid-pipe on and drive around for a while to make sure I can stand being catless. I understand a tune is necessary.

andv1 · 11-20-2011, 08:48 AM

Hey M! The CEL/SES light is a warning, so you shouldn't have any problems, ie Limp mode, driving around with it.

Raptor251 · 11-20-2011, 12:14 PM

And if you're sick like me you will love the smell!

Seriously though get rid of those pesky cats asap! (resonators are a must however!)

Money2536 · 11-20-2011, 01:54 PM

Quote:

Originally Posted by Raptor251

And if you're sick like me you will love the smell!

Seriously though get rid of those pesky cats asap! (resonators are a must however!)

Dinan Middle Racing Exhaust should be here in about a week!

niqui · 11-20-2011, 02:10 PM

my two shops, told me not to run with a cel for long because it causes the car to run rich...and its not good to push it when the cel's on....
what i was told.

///M Ryder · 11-20-2011, 10:10 PM

Quote:

Originally Posted by SehrSchnell

You won't mind the smell the second you hear that exhaust above 4 rpms.

+1

Mahmood07 · 11-20-2011, 10:26 PM

Quote:

Originally Posted by niqui

my two shops, told me not to run with a cel for long because it causes the car to run rich...and its not good to push it when the cel's on....
what i was told.

I'm interested in knowing more info about this. I had the car for quite a bit with CEL on until i got a tune recently.

bchang2001 · 11-21-2011, 01:32 AM

Quote:

Originally Posted by SehrSchnell

You'll be fine then... it doesn't matter if the CEL is on. You won't mind the smell the second you hear that exhaust above 4 rpms.

Really?? I can barely hear the exhaust after 5k rpms. Seems to me the sweet spot is between 3k-5k.

///M Ryder · 11-21-2011, 06:46 AM

Quote:

Originally Posted by bchang2001

Really?? I can barely hear the exhaust after 5k rpms. Seems to me the sweet spot is between 3k-5k.

What exhaust and tune do you have?..........Phil

Singletrack · 11-21-2011, 09:18 AM

Quote:

Originally Posted by Mahmood07

I'm interested in knowing more info about this. I had the car for quite a bit with CEL on until i got a tune recently.

If you were way out of spec - rich or lean, the car would throw a specific DTC for that. This would be a different DTC than the catalyst inefficiency.

If there were a dangerous condition, then you would go into limp mode with the decreased redline.

So in summary, I severely doubt you have anything to worry about. There may be some areas where things aren't perfect from a tuning perspective, but I doubt they are dangerous. It's hard to say exactly how it is performing since most tuners don't waste time testing this setup vs. their programming.

This will vary car to car though - not all programming will handle a cat-free exhaust as well as the M3.

BPMSport · 11-22-2011, 06:42 PM

No problem driving with the CEL on (IF the faults are for cat efficiency only). Pulling the cats off should not cause a lean/rich condition far enough to trigger an OBD-II fault for fuel mixture. The car will probably run slightly too rich and may not make optimal power, but it's not going to hurt anything other than your nose

Also, you can go full throttle without issue too.

Money2536 · 11-22-2011, 09:13 PM

Thanks Mike.

Singletrack · 11-22-2011, 10:05 PM

Quote:

Originally Posted by Mike Benvo

No problem driving with the CEL on (IF the faults are for cat efficiency only). Pulling the cats off should not cause a lean/rich condition far enough to trigger an OBD-II fault for fuel mixture. The car will probably run slightly too rich and may not make optimal power, but it's not going to hurt anything other than your nose

Also, you can go full throttle without issue too.

Nice to hear from someone with first hand experience!

bchang2001 · 11-24-2011, 04:18 AM

Quote:

Originally Posted by ///M Ryder

What exhaust and tune do you have?..........Phil

Dinan Full Exhaust
Dinan Stage 2

///M Ryder · 11-24-2011, 09:36 AM

Quote:

Originally Posted by bchang2001

Dinan Full Exhaust
Dinan Stage 2

And you don't hear or feel it after 5k? Man this thing sings in the upper band. Went to the track a couple of weeks ago and

...................Phil

bchang2001 · 11-24-2011, 12:14 PM

Quote:

Originally Posted by ///M Ryder

And you don't hear or feel it after 5k? Man this thing sings in the upper band. Went to the track a couple of weeks ago and

...................Phil

maybe im not doing it right

11-19-2011, 06:22 AM	#1
Money2536 Colonel 1586 Rep 2,148 Posts Drives: '13 E92 M3 \| 992 GT3 Touring Join Date: Feb 2010 Location: The Villages, FL iTrader: (1)	Question about Driving around w/ CEL I just bought bought a used Dinan Middle Racing Exhaust. I think I already know the answer to this question. Is there any issue driving around for a few weeks with CEL light prior to getting a tune other than an annoying light on my dash? I assume the DME will adapt to the loss of the cats and simply indicate there is issue. Thoughts?
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11-19-2011, 06:12 PM	#2
///M Ryder Grown Azz Man 430 Rep 3,021 Posts Drives: GT4 Join Date: Dec 2010 Location: Texas iTrader: (8)	You should have no problem. The Dinan tune will eliminate the CEL.........Phil __________________ 2016 GT4.....Sapphire Blue Metallic, Platinum stitch Leather/Alcantara interior, Carbon Fiber Trim, PCM w/Nav, Guards Red Belts, 2 Zone Climate, Sport Chrono, LWB, Smokers Pack, Big Gas Tank, Light Design Pack, Bi-Xenon w/PDL, Auto Dim Mirror, Clear Side Markers, GTS Clear Taillights
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11-20-2011, 08:35 AM	#3
Money2536 Colonel 1586 Rep 2,148 Posts Drives: '13 E92 M3 \| 992 GT3 Touring Join Date: Feb 2010 Location: The Villages, FL iTrader: (1)	Maybe I didn't make myself clear. I'm going to put the mid-pipe on and drive around for a while to make sure I can stand being catless. I understand a tune is necessary.
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11-20-2011, 08:48 AM	#4
andv1 Private First Class 8 Rep 160 Posts Drives: 09E90 SG/FR 6MT Join Date: Nov 2009 Location: Los Angeles iTrader: (6)	Hey M! The CEL/SES light is a warning, so you shouldn't have any problems, ie Limp mode, driving around with it.
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11-20-2011, 12:14 PM	#5
Raptor251 ESS Dreaming 27 Rep 870 Posts Drives: 2011.5 e92 m3/Ford Raptor 6.2 Join Date: Jan 2011 Location: San Diego iTrader: (1)	And if you're sick like me you will love the smell! Seriously though get rid of those pesky cats asap! (resonators are a must however!)
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11-20-2011, 02:10 PM	#7
niqui Brigadier General 127 Rep 3,110 Posts Drives: Jet Black E92 M3 Join Date: Feb 2009 Location: Canada iTrader: (7)	my two shops, told me not to run with a cel for long because it causes the car to run rich...and its not good to push it when the cel's on.... what i was told. __________________ Jet Black E92 M3
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11-22-2011, 06:42 PM	#13
BPMSport BimmerPost Supporting Vendor 3387 Rep 7,542 Posts Drives: Harrop M3 / F10 M5 / F82 M4 Join Date: Apr 2008 Location: SoCal iTrader: (9) Garage List 2000 BMW M5 [0.00] 1990 BMW 735i Turbo [0.00] 2008 BMW M3 [7.50] 2015 BMW M3 [0.00] 2015 BMW M5 [0.00]	No problem driving with the CEL on (IF the faults are for cat efficiency only). Pulling the cats off should not cause a lean/rich condition far enough to trigger an OBD-II fault for fuel mixture. The car will probably run slightly too rich and may not make optimal power, but it's not going to hurt anything other than your nose Also, you can go full throttle without issue too. __________________ -----\| Like us on Facebook \| Instagram \|\| Tuning Information \| Remote Coding \|----- ----Visit us at www.BPMSport.com - Emotion. Driven. \| Toll Free: (888) 557-5133----
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11-22-2011, 09:13 PM	#14
Money2536 Colonel 1586 Rep 2,148 Posts Drives: '13 E92 M3 \| 992 GT3 Touring Join Date: Feb 2010 Location: The Villages, FL iTrader: (1)	Thanks Mike.
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