Cobb Accessport MPG Question

neokenxx · 01-18-2006, 08:13 PM

whats up guys. listen last week i put a turboxs catless uppipe, and catless turboback with rfl/ti on my car and my gas mpg has gone to **** it seems.

right now my mods are:
TXS Intake
TXS Up
TXS TBE
HKS SSQV
(all catless)

i have a cobb accessport in the mail, should be here in a few days.
my question is, i know that having up/dwn with especially a bov makes my car run very rich. will running the base stage 2 (93oct) map improve my gas mileage some? or do i really just need to get it tuned. as of now i cant afford a tune. had to spend money on college books.

it honestly seems like im getting somewhere around 16-18mpg right now.
will the mpg go up with a stage 2 base map, becasue the car needs em?
also will the bov do some damage to performance? i head a bov with the stage2 map is iffy. also what about the intake? stage 2 map is only ment for tbe.

thanks so much for any responses,
matt v.

* Registered users of the site do not see these ads.

mcowger · 01-18-2006, 08:49 PM

The BOV only makes the car run rich on throttle lift, not all the time.

But, depending on how you drive, 16-18MPG is great. I get less than that with 100% city driving.

kellie00 · 01-18-2006, 08:56 PM

I don't have any hard data on the matter, just one guys story that I go to school with. He was running the same BOV and AP and was having some problems with the car (an 04), took the BOV off, replaced stock, no more problems. Now, don't let that scare you, just thought I would add my experience.

turbo tecnica · 01-18-2006, 09:05 PM

Quote:

Originally Posted by mcowger

The BOV only makes the car run rich on throttle lift, not all the time.

But, depending on how you drive, 16-18MPG is great. I get less than that with 100% city driving.

16-18mpg great? When I was running Cobb stage 2 + uppipe I was getting 25-26mpg mixed city and highway (80% city, 20% highway). The BOV will make it run rich after throttle lift, like he said. If you are driving more city, then that would probably mean more throttle lifts... which could cause crappy MPG.

Edit: Yeah, depending how you drive. 16-18mpg would be good if driving WOT a lot. For regular driving, though, 16-18mpg is pretty bad.

WRC-Go · 01-18-2006, 10:04 PM

I haven't noticed any difference in mileage going from stock to Stage 1 to Stage 2 with my accessport.

05redrex · 01-18-2006, 10:18 PM

I would think the BOV would make it run rich, but only because it removes air. I wouldn't think it would be adding fuel.

lin_tp2 · 01-18-2006, 10:24 PM

im running stage 2 cobb with protune. catless upipe, dp and catback

still getting 22 mpg

i think you should take the bov off and put the stock one back on. also when you get the cobb ap get some tuning that might help

neokenxx · 01-18-2006, 10:32 PM

ok im gonan put the stock bov back on till i get a tune in a few weeks. will the stock bov hold the higher boost ok? ive ehar dof them leaking at 16+ psi and letting boost out near redline. should i be worried. is stock bov good for stage 2 basemap and stage 2 protune? at what point should i worry about a stronger bpv?

mcowger · 01-18-2006, 10:47 PM

The stock BOV will handle WELL over 16 psi no problem. More like 20+psi. The loss of pressure at redline is intentional ECU programming, not a leak.

The stock BOV is good for pretty much any setup you are likely to do that uses a TMIC.

lin_tp2 · 01-18-2006, 10:48 PM

the stock bov is good for stage 2. I know a lot people that upgrade turbo (vf 22, 34) and are still running stock bov. however if you like the sound of the bov and intake i would recommend getting the protune so your car doesnt run rich and you also get the max. performance of all your aftermarket parts.

neokenxx · 01-18-2006, 10:54 PM

thanks alot sounds great. ill put the stock bpv on for a while, and might even leave it on. but the intake im gonna leave on regardless.

samesk8r · 01-19-2006, 09:17 AM

You have to ditch the intake. All the Map notes on Cobb's website clearly state that you HAVE to use the stock intake. Although PDX Tuning offers AP maps so you may want to check in with them.

neokenxx · 01-19-2006, 02:26 PM

yeah this morning before work i put the stock intake and stock bpv back on my car. wastegute flutter is alot louder. but w/e. ill keep the other parts and throw them back on right before, or when i get a tune.

thanks guys.

01-18-2006, 08:13 PM	#1
neokenxx Scooby Newbie Member#: 92017 Join Date: Jul 2005 Location: Cumberland, RI Vehicle: 2004 WRX Sedan Cobb Stage 2+	Cobb Accessport MPG Question whats up guys. listen last week i put a turboxs catless uppipe, and catless turboback with rfl/ti on my car and my gas mpg has gone to **** it seems. right now my mods are: TXS Intake TXS Up TXS TBE HKS SSQV (all catless) i have a cobb accessport in the mail, should be here in a few days. my question is, i know that having up/dwn with especially a bov makes my car run very rich. will running the base stage 2 (93oct) map improve my gas mileage some? or do i really just need to get it tuned. as of now i cant afford a tune. had to spend money on college books. it honestly seems like im getting somewhere around 16-18mpg right now. will the mpg go up with a stage 2 base map, becasue the car needs em? also will the bov do some damage to performance? i head a bov with the stage2 map is iffy. also what about the intake? stage 2 map is only ment for tbe. thanks so much for any responses, matt v. * Registered users of the site do not see these ads.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Cobb Tuning Accessport Version I Cobb Accessport	WRX0520	Engine/Power/Exhaust	0	07-18-2007 03:02 AM
Cobb Accessport Question - Noob question	hlanderr	Newbies & FAQs	7	05-08-2006 12:23 PM
cobb accessport questions	speedyshifter	Engine Management & Tuning	23	03-29-2005 03:31 PM
cobb accessport questions	skimmilk68	Engine Management & Tuning	18	04-05-2004 08:25 PM
Questions about the Cobb AccessPort	03WRX83	Engine Management & Tuning	13	12-12-2003 02:23 AM

01-18-2006, 08:49 PM	#2
mcowger Scooby Specialist Member#: 77483 Join Date: Dec 2004 Chapter/Region: NWIC Location: Seattle, WA Vehicle: 2009 Audi A3 2.0T q Lava Grey	The BOV only makes the car run rich on throttle lift, not all the time. But, depending on how you drive, 16-18MPG is great. I get less than that with 100% city driving.

01-18-2006, 08:56 PM	#3
kellie00 Scooby Newbie Member#: 80965 Join Date: Feb 2005 Chapter/Region: TXIC Location: Dallas, TX Vehicle: 2012 STI Silver	I don't have any hard data on the matter, just one guys story that I go to school with. He was running the same BOV and AP and was having some problems with the car (an 04), took the BOV off, replaced stock, no more problems. Now, don't let that scare you, just thought I would add my experience.

01-18-2006, 10:04 PM	#5
WRC-Go Scooby Newbie Member#: 29917 Join Date: Nov 2002 Location: Appalachian Mountains VA Vehicle: 2003 WRXWgn-WRB sold EVO IX-MR, 98 Viper	I haven't noticed any difference in mileage going from stock to Stage 1 to Stage 2 with my accessport.

01-18-2006, 10:18 PM	#6
05redrex Scooby Specialist Member#: 86665 Join Date: May 2005 Chapter/Region: TXIC Location: Frisco, TX Vehicle: 2005 WRX SRR 2.5/20g 2010 FXT SWP Cobb Stg2+	I would think the BOV would make it run rich, but only because it removes air. I wouldn't think it would be adding fuel.

01-18-2006, 10:24 PM	#7
lin_tp2 Scooby Newbie Member#: 66364 Join Date: Jul 2004 Location: BAY AREA Vehicle: 02 wrx wrb	im running stage 2 cobb with protune. catless upipe, dp and catback still getting 22 mpg i think you should take the bov off and put the stock one back on. also when you get the cobb ap get some tuning that might help

01-18-2006, 10:32 PM	#8
neokenxx Scooby Newbie Member#: 92017 Join Date: Jul 2005 Location: Cumberland, RI Vehicle: 2004 WRX Sedan Cobb Stage 2+	ok im gonan put the stock bov back on till i get a tune in a few weeks. will the stock bov hold the higher boost ok? ive ehar dof them leaking at 16+ psi and letting boost out near redline. should i be worried. is stock bov good for stage 2 basemap and stage 2 protune? at what point should i worry about a stronger bpv?

01-18-2006, 10:47 PM	#9
mcowger Scooby Specialist Member#: 77483 Join Date: Dec 2004 Chapter/Region: NWIC Location: Seattle, WA Vehicle: 2009 Audi A3 2.0T q Lava Grey	The stock BOV will handle WELL over 16 psi no problem. More like 20+psi. The loss of pressure at redline is intentional ECU programming, not a leak. The stock BOV is good for pretty much any setup you are likely to do that uses a TMIC.

01-18-2006, 10:48 PM	#10
lin_tp2 Scooby Newbie Member#: 66364 Join Date: Jul 2004 Location: BAY AREA Vehicle: 02 wrx wrb	the stock bov is good for stage 2. I know a lot people that upgrade turbo (vf 22, 34) and are still running stock bov. however if you like the sound of the bov and intake i would recommend getting the protune so your car doesnt run rich and you also get the max. performance of all your aftermarket parts.

01-18-2006, 10:54 PM	#11
neokenxx Scooby Newbie Member#: 92017 Join Date: Jul 2005 Location: Cumberland, RI Vehicle: 2004 WRX Sedan Cobb Stage 2+	thanks alot sounds great. ill put the stock bpv on for a while, and might even leave it on. but the intake im gonna leave on regardless.

01-19-2006, 09:17 AM	#12
samesk8r Scooby Newbie Member#: 65070 Join Date: Jun 2004 Chapter/Region: MWSOC Location: Ann Arbor Vehicle: 2005 Ex-WRX owner :single tear:	You have to ditch the intake. All the Map notes on Cobb's website clearly state that you HAVE to use the stock intake. Although PDX Tuning offers AP maps so you may want to check in with them.

01-19-2006, 02:26 PM	#13
neokenxx Scooby Newbie Member#: 92017 Join Date: Jul 2005 Location: Cumberland, RI Vehicle: 2004 WRX Sedan Cobb Stage 2+	yeah this morning before work i put the stock intake and stock bpv back on my car. wastegute flutter is alot louder. but w/e. ill keep the other parts and throw them back on right before, or when i get a tune. thanks guys.