all cats removed, car is not back firing

hidden moose · 03-29-2015, 02:15 PM

I have a 2step set to 4500 RPM and catless exhaust. unlike every video I have watched with the same setup, my car does not backfire, no smoke, no fire. what's causing this?

WilliamS · 03-29-2015, 02:19 PM

Your car isnt dumping enough fuel for a backfire. Thats usually from way to much fuel in the system and the pressure and heat at the tailpipe creates the bang. Darn BMW's. You can richen up the mixture a bit to get what you are looking for. But like a diesel that has a ton of black smoke, its just not tuned right.

hidden moose · 03-29-2015, 03:00 PM

How can I richen up the mixture? I have 4 inch tips and magnaflow mufflers, running 45% mix of e85, still not even a pop

WilliamS · 03-29-2015, 03:03 PM

in your tune. you cant force more fuel on a bmw, you have to target and AF ratio. not great for the car.

TrAcK TRaP · 03-29-2015, 03:18 PM

and stop looking at mirrors to catch back firing keep your head on the road you'll have an accident..

stanlalee · 03-29-2015, 03:28 PM

Quote:

Originally Posted by N54CherryHill

and stop looking at mirrors to catch back firing keep your head on the road you'll have an accident..

Its a two step

why would he be moving.

idrift4wd · 03-29-2015, 05:24 PM

raise rpm.

glachhman2 · 03-29-2015, 07:19 PM

race map boi

Kevinl · 03-29-2015, 08:51 PM

who would of ever thought someone would want a car to backfire

TheYuriPanda · 03-30-2015, 08:20 AM

Quote:

Originally Posted by Kevinl

who would of ever thought someone would want a car to backfire

Who wouldn't? To all their own.

LightningTuned · 03-30-2015, 09:09 AM

The point of 2step is to build boost... Are you building boost? It does this by enriching the fuel mixture and retarding timing.

prelude2perfect · 03-30-2015, 10:07 AM

I get it often when I NLS but not very often on 2 step. E40 on JB4 with Race flash

trixdout · 03-30-2015, 10:13 AM

If you want ricer like function from your bmw, sell it and get a civic.

Jeff@TopGearSolutions · 03-30-2015, 11:50 AM

As others said, it needs more fuel during the 2 step. (How that's configured, I don't know). The step 2 is designed for racing not for ricing.

Blaizon · 03-30-2015, 11:59 AM

Quote:

Originally Posted by Jeff@TopGearSolutions

As others said, it needs more fuel during the 2 step. (How that's configured, I don't know). The step 2 is designed for racing not for ricing.

e92_boost · 03-30-2015, 02:12 PM

Pour some gas on the tips then take a lighter and light it and boom fire

jonas · 03-30-2015, 06:51 PM

The back fire of most bimmers is from too much fueling. And coming over from the diesel scene I cannot tell you how many kids just want to "roll coal" from their truck with little to no understanding of how it will affect anything else. Over fueling is not always good, and can lead to stress on other parts that will rack up costly repairs. Are those repairs worth looking cool? That's up for you to decide. When I was younger, I would have said hell yeah! So I can't say too much in that aspect...

hidden moose · 03-31-2015, 09:27 AM

Just asked a question guys, I know a lot of people like to hate on what others want to do, but its their car and their decision, I appreciate those who gave advice

trixdout · 04-02-2015, 08:56 AM

be wary of excessive fuel in your cylinders. itll thin out the oil and ruin your ring seal on your pistons. you have been forewarned.

HouseN54 · 04-02-2015, 10:30 AM

What are you trying to do? Be like my old S366 S2000......

danniexi · 04-02-2015, 10:54 AM

Quote:

Originally Posted by HouseN54

What are you trying to do? Be like my old S366 S2000......

i want this. you had NAWS?

HouseN54 · 04-02-2015, 10:59 AM

Quote:

Originally Posted by danniexi

i want this. you had NAWS?

Naw, Straight e85 via aeromotive 1000 fuel pump

03-29-2015, 02:15 PM	#1
hidden moose Private 6 Rep 69 Posts Drives: e92 335i Join Date: Sep 2013 Location: winter park, fl iTrader: (0)	all cats removed, car is not back firing I have a 2step set to 4500 RPM and catless exhaust. unlike every video I have watched with the same setup, my car does not backfire, no smoke, no fire. what's causing this?
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03-29-2015, 02:19 PM	#2
WilliamS GoofBall 50 Rep 1,055 Posts Drives: 2008 E92 N54 Xdrive Join Date: Jun 2012 Location: Tampa, FL iTrader: (2)	Your car isnt dumping enough fuel for a backfire. Thats usually from way to much fuel in the system and the pressure and heat at the tailpipe creates the bang. Darn BMW's. You can richen up the mixture a bit to get what you are looking for. But like a diesel that has a ton of black smoke, its just not tuned right.
	Appreciate 0 Quote

03-29-2015, 03:00 PM	#3
hidden moose Private 6 Rep 69 Posts Drives: e92 335i Join Date: Sep 2013 Location: winter park, fl iTrader: (0)	How can I richen up the mixture? I have 4 inch tips and magnaflow mufflers, running 45% mix of e85, still not even a pop
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03-29-2015, 03:03 PM	#4
WilliamS GoofBall 50 Rep 1,055 Posts Drives: 2008 E92 N54 Xdrive Join Date: Jun 2012 Location: Tampa, FL iTrader: (2)	in your tune. you cant force more fuel on a bmw, you have to target and AF ratio. not great for the car.
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03-29-2015, 03:18 PM	#5
TrAcK TRaP bOrN To DiE 413 Rep 1,738 Posts Drives: 2011 E92 M3 ZCP Join Date: Apr 2013 Location: South Jersey iTrader: (0)	and stop looking at mirrors to catch back firing keep your head on the road you'll have an accident..
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03-29-2015, 05:24 PM	#7
idrift4wd Brigadier General 149 Rep 3,552 Posts Drives: Three Hundred and Thirty Five Join Date: Jul 2010 Location: Yonkers NY iTrader: (0) Garage List 2007 BMW [7.00]	raise rpm. __________________ 12.0 @ 117
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03-29-2015, 07:19 PM	#8
glachhman2 Banned 45 Rep 303 Posts Drives: 2007 335i Join Date: Mar 2015 Location: Queens, NY iTrader: (0)	race map boi
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03-29-2015, 08:51 PM	#9
Kevinl Lieutenant 210 Rep 563 Posts Drives: 2017 BMW M3 Alpine White 6MT Join Date: Aug 2014 Location: Phoenix iTrader: (0)	who would of ever thought someone would want a car to backfire __________________ 2017 M3 Alpine White 6MT
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03-30-2015, 09:09 AM	#11
LightningTuned Private 13 Rep 68 Posts Drives: 07 335i E90 Join Date: Jan 2015 Location: Va Beach iTrader: (0)	The point of 2step is to build boost... Are you building boost? It does this by enriching the fuel mixture and retarding timing.
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03-30-2015, 10:07 AM	#12
prelude2perfect Captain 60 Rep 621 Posts Drives: 2013 M5 and 2015 535i Join Date: Apr 2010 Location: Savannah, GA iTrader: (8)	I get it often when I NLS but not very often on 2 step. E40 on JB4 with Race flash
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03-30-2015, 10:13 AM	#13
trixdout Lieutenant 57 Rep 439 Posts Drives: '11 335xi 6mt Join Date: Apr 2014 Location: NNJ iTrader: (1)	If you want ricer like function from your bmw, sell it and get a civic. __________________ LMB , M-Sport, JB4 Stg. 2, AR catless res. dp, ETS cp
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03-30-2015, 11:50 AM	#14
Jeff@TopGearSolutions 3442 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	As others said, it needs more fuel during the 2 step. (How that's configured, I don't know). The step 2 is designed for racing not for ricing.
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03-30-2015, 02:12 PM	#16
e92_boost Captain 224 Rep 703 Posts Drives: Smart Car Join Date: Nov 2014 Location: Kenosha Wi iTrader: (0)	Pour some gas on the tips then take a lighter and light it and boom fire __________________ ESS G1 e90 - BBS E88
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03-30-2015, 06:51 PM	#17
jonas Private 15 Rep 68 Posts Drives: It's black... Join Date: Feb 2015 Location: United States iTrader: (0)	The back fire of most bimmers is from too much fueling. And coming over from the diesel scene I cannot tell you how many kids just want to "roll coal" from their truck with little to no understanding of how it will affect anything else. Over fueling is not always good, and can lead to stress on other parts that will rack up costly repairs. Are those repairs worth looking cool? That's up for you to decide. When I was younger, I would have said hell yeah! So I can't say too much in that aspect... __________________ 2013 F350 37 inch tires, and go fast parts 2008 335i JB4, FBO (Powered by Hopes and Dreams) [SOLD] 2002 F-250 40" tires, and other goodies (toy) [SOLD] USAF, Support the Troops
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03-31-2015, 09:27 AM	#18
hidden moose Private 6 Rep 69 Posts Drives: e92 335i Join Date: Sep 2013 Location: winter park, fl iTrader: (0)	Just asked a question guys, I know a lot of people like to hate on what others want to do, but its their car and their decision, I appreciate those who gave advice
	Appreciate 0 Quote

04-02-2015, 08:56 AM	#19
trixdout Lieutenant 57 Rep 439 Posts Drives: '11 335xi 6mt Join Date: Apr 2014 Location: NNJ iTrader: (1)	be wary of excessive fuel in your cylinders. itll thin out the oil and ruin your ring seal on your pistons. you have been forewarned. __________________ LMB , M-Sport, JB4 Stg. 2, AR catless res. dp, ETS cp
	Appreciate 0 Quote

04-02-2015, 10:30 AM	#20
HouseN54 Lieutenant 106 Rep 483 Posts Drives: E92 coupe Join Date: Jan 2014 Location: Buffalo iTrader: (2)	What are you trying to do? Be like my old S366 S2000...... __________________
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