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Old 01-18-2006, 08:13 PM   #1
neokenxx
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2004 WRX Sedan
Cobb Stage 2+

Default 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.
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Old 01-18-2006, 08:49 PM   #2
mcowger
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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.
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Old 01-18-2006, 08:56 PM   #3
kellie00
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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.
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Old 01-18-2006, 09:05 PM   #4
turbo tecnica
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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.
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Old 01-18-2006, 10:04 PM   #5
WRC-Go
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I haven't noticed any difference in mileage going from stock to Stage 1 to Stage 2 with my accessport.
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Old 01-18-2006, 10:18 PM   #6
05redrex
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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.
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Old 01-18-2006, 10:24 PM   #7
lin_tp2
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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
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Old 01-18-2006, 10:32 PM   #8
neokenxx
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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?
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Old 01-18-2006, 10:47 PM   #9
mcowger
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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.
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Old 01-18-2006, 10:48 PM   #10
lin_tp2
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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.
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Old 01-18-2006, 10:54 PM   #11
neokenxx
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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.
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Old 01-19-2006, 09:17 AM   #12
samesk8r
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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.
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Old 01-19-2006, 02:26 PM   #13
neokenxx
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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.
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