downpipes??

Alex_750whp · 08-24-2010, 11:12 PM

i just put my downpipes and i have notice that am wasting alot more gas is this normal or can it be that the fuel pump is getting mess up?? I already replace a new fuel pump??

mineo77 · 08-25-2010, 09:36 AM

you are probably driving faster! :->

Alex_750whp · 08-25-2010, 10:19 AM

Am driving the same i shift at 2,000rpm what i have notice is that by 1,700rpm the turbos are spooling already? Maby is that?

Andrew@LutzPerformance · 08-25-2010, 10:30 AM

I'm with Tim on this one, i mean how much more are you actually using?

Alex_750whp · 08-25-2010, 10:44 AM

using what??

JHOOPS2 · 08-25-2010, 11:00 AM

Fuel

vividracing · 08-25-2010, 11:28 AM

DP's equal quicker spool. Quicker spool mean's less throttle, thus the same throttle movement from before actually means more. Also, your probably driving a bit more enthusiastically, you probably don't even realize it. Lastly did you replace the o2's? That will help mpg if your car is over a year old.

bryce · 08-25-2010, 01:11 PM

Quote:

Originally Posted by Alex450whp

Am driving the same i shift at 2,000rpm what i have notice is that by 1,700rpm the turbos are spooling already? Maby is that?

really?

Das Ein · 08-25-2010, 01:17 PM

Quote:

Originally Posted by bryce

really?

That's just above idle pretty much.

JHOOPS2 · 08-25-2010, 01:41 PM

I am not sure what effect it has on these cars, but I know that a lot of turbo cars that I have tuned or been tuned can really richen up when being lugged around with a high load @ low RPMs. Ideally 2800-3000 rpms would be where I would shift one of these during normal driving. Like I said though, I have yet to datalog a N54 in the light chassis of the 1 series.

bryce · 08-25-2010, 01:52 PM

Quote:

Originally Posted by Das Ein

That's just above idle pretty much.

Quote:

Originally Posted by JHOOPS2

I am not sure what effect it has on these cars, but I know that a lot of turbo cars that I have tuned or been tuned can really richen up when being lugged around with a high load @ low RPMs. Ideally 2800-3000 rpms would be where I would shift one of these during normal driving. Like I said though, I have yet to datalog a N54 in the light chassis of the 1 series.

yea, shifting at 2k rpms is inviting excess carbon build up. i shift at 4k rpms daily driving, and hit redline at least once per trip, with plenty of WOT pulls. i've averaged 21.1 mpg since i've owned the car, i think this engine needs to "stretch it's legs" to run properly.

JHOOPS2 · 08-25-2010, 03:32 PM

One word : Autobahn

Alex_750whp · 08-25-2010, 05:09 PM

Am getting 15.2mpg and am not a fast driver? this happend when i install the dp with out them i would get 21.2 mpg?

bryce · 08-25-2010, 05:35 PM

Quote:

Originally Posted by Alex450whp

Am getting 15.2mpg and am not a fast driver? this happend when i install the dp with out them i would get 21.2 mpg?

unless something went wrong with your install (damaged o2 sensor, etc.), you should be getting the same or better fuel mileage. try resetting your computer for mpg and start shifting at 3-4k rpms instead of 2k. if that doesn't work to increase your mpg, trouble shoot to see if something was damaged or incorrectly installed when the dp's went in.

onefastman · 08-25-2010, 05:40 PM

Wow, why did you put dp's on if you shift at 2 lol

Seriously though, you probably either damaged a o2 or just have too much city factored in the new mpg estimate.

igom3 · 08-25-2010, 05:43 PM

i'm getting better fuel milage with my downpipes. Not alot but better.

InlineSix · 08-25-2010, 05:48 PM

Anyone know what the gains would be alone with just DP? Maybe done a before and after dyno and can post the results?

bryce · 08-25-2010, 05:54 PM

Quote:

Originally Posted by onefastman

Wow, why did you put dp's on if you shift at 2 lol

Seriously though, you probably either damaged a o2 or just have too much city factored in the new mpg estimate.

Quote:

Originally Posted by igom3

i'm getting better fuel milage with my downpipes. Not alot but better.

i also noticed a slight increase in mpg after installing my dp's

Quote:

Originally Posted by InlineSix

Anyone know what the gains would be alone with just DP? Maybe done a before and after dyno and can post the results?

the gains of downpipes are best when you turn up the boost. you'll notice decent gains at stock boost levels (15-30 whp and tq), however. personally, i wouldn't go through the pain in the ass install, risk the emissions implications, or have dealership concerns if i was just going to run stock boost levels after the dp install.

ES BMW · 08-26-2010, 09:57 AM

Quote:

Originally Posted by JHOOPS2

One word : Autobahn

Aaaand... since we don't have those on this side of the pond... I got two words - Track Day!

Dmacc · 08-26-2010, 01:02 PM

Quote:

Originally Posted by My E90

Aaaand... since we don't have those on this side of the pond... I got two words - Track Day!

or "Mountain Roads"

Alex_750whp · 08-26-2010, 06:41 PM

Quote:

Originally Posted by onefastman

Wow, why did you put dp's on if you shift at 2 lol

Seriously though, you probably either damaged a o2 or just have too much city factored in the new mpg estimate.

I put on dp for the car can have a deeper tone and to gain hp I shift at low rpm for it wont wast gas!!!! And no o2 sensor got damage!!!!!

Biasasaja · 08-26-2010, 10:58 PM

i'd like to change dp as well but it will void my 5 years free service + parts

so pretty much im stuck with stock for 5 years or so....
not to mention potentially hpfp failure.. dont really wanna void the free service+parts......

08-24-2010, 11:12 PM	#1
Alex_750whp First Lieutenant 49 Rep 320 Posts Drives: white 335i Join Date: Jun 2010 Location: MIA iTrader: (1) Garage List 2008 135i [10.00]	downpipes?? i just put my downpipes and i have notice that am wasting alot more gas is this normal or can it be that the fuel pump is getting mess up?? I already replace a new fuel pump?? __________________ Current- 2009 M-Sport 135i SOLD-2008 135i(Jb4-15ohm-FSB)map 3 @ 19psi, Active Autowerke Charge Pipe with Dual meth nozzle cm5 & cm10, Active Autowerke Intercooler, AFE Intakes, Active Autowerke DP with RR Catback exhaust and KW V2 coilover.
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08-25-2010, 09:36 AM	#2
mineo77 Lieutenant Colonel 125 Rep 1,925 Posts Drives: 2010 135i,1989 PRO3,2001 530i Join Date: Aug 2009 Location: Portland,OR iTrader: (2) Garage List 2010 135i coupe [7.56]	you are probably driving faster! :-> __________________ 135i coupe  6MT  TiAg  ///M sport http://www.rhominnovations.com www.musicarNW.com www.unitedBMWonline.com
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08-25-2010, 10:19 AM	#3
Alex_750whp First Lieutenant 49 Rep 320 Posts Drives: white 335i Join Date: Jun 2010 Location: MIA iTrader: (1) Garage List 2008 135i [10.00]	Am driving the same i shift at 2,000rpm what i have notice is that by 1,700rpm the turbos are spooling already? Maby is that? __________________ Current- 2009 M-Sport 135i SOLD-2008 135i(Jb4-15ohm-FSB)map 3 @ 19psi, Active Autowerke Charge Pipe with Dual meth nozzle cm5 & cm10, Active Autowerke Intercooler, AFE Intakes, Active Autowerke DP with RR Catback exhaust and KW V2 coilover.
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08-25-2010, 10:30 AM	#4
Andrew@LutzPerformance 60 Rep 970 Posts Drives: 1995 M3 GT35R Join Date: Dec 2008 Location: 6333 N Dale Mabry Hwy Tampa, FL iTrader: (0)	I'm with Tim on this one, i mean how much more are you actually using?
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08-25-2010, 10:44 AM	#5
Alex_750whp First Lieutenant 49 Rep 320 Posts Drives: white 335i Join Date: Jun 2010 Location: MIA iTrader: (1) Garage List 2008 135i [10.00]	using what?? __________________ Current- 2009 M-Sport 135i SOLD-2008 135i(Jb4-15ohm-FSB)map 3 @ 19psi, Active Autowerke Charge Pipe with Dual meth nozzle cm5 & cm10, Active Autowerke Intercooler, AFE Intakes, Active Autowerke DP with RR Catback exhaust and KW V2 coilover.
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08-25-2010, 11:00 AM	#6
JHOOPS2 AKA HISSMAN 34 Rep 888 Posts Drives: 2009 SG 135i Coupe' Join Date: Aug 2010 Location: USA iTrader: (5)	Fuel
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08-25-2010, 11:28 AM	#7
vividracing 689 Rep 6,854 Posts Drives: E90 M3, F30 335i, F80 M3 Join Date: Aug 2006 Location: Arizona iTrader: (14)	DP's equal quicker spool. Quicker spool mean's less throttle, thus the same throttle movement from before actually means more. Also, your probably driving a bit more enthusiastically, you probably don't even realize it. Lastly did you replace the o2's? That will help mpg if your car is over a year old.
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08-25-2010, 01:41 PM	#10
JHOOPS2 AKA HISSMAN 34 Rep 888 Posts Drives: 2009 SG 135i Coupe' Join Date: Aug 2010 Location: USA iTrader: (5)	I am not sure what effect it has on these cars, but I know that a lot of turbo cars that I have tuned or been tuned can really richen up when being lugged around with a high load @ low RPMs. Ideally 2800-3000 rpms would be where I would shift one of these during normal driving. Like I said though, I have yet to datalog a N54 in the light chassis of the 1 series.
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08-25-2010, 03:32 PM	#12
JHOOPS2 AKA HISSMAN 34 Rep 888 Posts Drives: 2009 SG 135i Coupe' Join Date: Aug 2010 Location: USA iTrader: (5)	One word : Autobahn
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08-25-2010, 05:09 PM	#13
Alex_750whp First Lieutenant 49 Rep 320 Posts Drives: white 335i Join Date: Jun 2010 Location: MIA iTrader: (1) Garage List 2008 135i [10.00]	Am getting 15.2mpg and am not a fast driver? this happend when i install the dp with out them i would get 21.2 mpg? __________________ Current- 2009 M-Sport 135i SOLD-2008 135i(Jb4-15ohm-FSB)map 3 @ 19psi, Active Autowerke Charge Pipe with Dual meth nozzle cm5 & cm10, Active Autowerke Intercooler, AFE Intakes, Active Autowerke DP with RR Catback exhaust and KW V2 coilover.
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08-25-2010, 05:40 PM	#15
onefastman Major General 159 Rep 5,689 Posts Drives: 2009 135i 2011 e92m dct Join Date: Sep 2009 Location: Earth iTrader: (15)	Wow, why did you put dp's on if you shift at 2 lol Seriously though, you probably either damaged a o2 or just have too much city factored in the new mpg estimate. __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(1addicts.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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08-25-2010, 05:43 PM	#16
igom3 Major 76 Rep 1,147 Posts Drives: 02 E46M3 15 F80 M3 16 X5 35d Join Date: Mar 2009 Location: San Diego iTrader: (1) Garage List 2016 X5 35d [0.00] 2015 BMW M3 [0.00] 2002 E46 M3 [0.00]	i'm getting better fuel milage with my downpipes. Not alot but better.
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08-25-2010, 05:48 PM	#17
InlineSix TwinTurbo Top Hat 22 Rep 252 Posts Drives: 2016 M235i Join Date: Feb 2009 Location: Miami Florida iTrader: (0)	Anyone know what the gains would be alone with just DP? Maybe done a before and after dyno and can post the results? __________________ AW 2008 135i - Auto, Prem, with Sat Radio BMW CCA # 417107
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08-26-2010, 10:58 PM	#22
Biasasaja Enlisted Member 7 Rep 42 Posts Drives: F10 M5 LCI Join Date: Aug 2010 Location: Jakarta, Indonesia iTrader: (0)	i'd like to change dp as well but it will void my 5 years free service + parts so pretty much im stuck with stock for 5 years or so.... not to mention potentially hpfp failure.. dont really wanna void the free service+parts......
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