Negative/Positive Effects???
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Negative/Positive Effects???
What effects does a cat less up-pipe, cat less down-pipe, Cat-back System(HKS Carbon-Ti), High Flow Cold Air Intake(APS), & Blowoff Valve(Turbo XS Type-RFL), have on a stock WRX engine? Does it make it run rich, or lean, etc.
Mark
Mark
Registered User
Joined: Jul 2004
Posts: 291
From: Concord, CA
Car Info: Its a gross polluter : (
I have those items, and i think i run rich because my car back fires. I was told by Vishnu Performance that i will have these problems until i buy a piggyback ecu or reflash mine.
Registered User
iTrader: (19)
Joined: Mar 2004
Posts: 1,208
From: Waikele,Hawaii
Car Info: JBP 04' WRX
Originally Posted by Lurk
All those mods should lean it out a little bit. Except for the H-RFL blow off valve. Ditch that thing, its a POS.
question: how does an up/down pipe w/cat back make the car run lean?
not trying to be an azz just being curious is all.
The bov and cai will cost you around $450 and if you do a search you will find that they will do nothing for your cars performance and they can actually cause problems. I think the TXS RFL bov vents 100% atmospheric (not sure though) which isnt the best for a factory turbo application. If you really want that sound you may want to look into the GFB bov (or something like it) since it is adjustable and can run 50/50 (50%atmospheric vent/ 50% recirculation). I'm not saying that these parts are useless with all applications but they are with only an upipe and DP.
If I were you I would use that $ for some engine management unless you just want the bov for the niose.
If I were you I would use that $ for some engine management unless you just want the bov for the niose.
VIP Member
iTrader: (15)
Joined: Sep 2003
Posts: 2,331
From: San Francisco / Riverside
Car Info: 2004 White GDB
^^^
agree
the cai intake makes the car run lean because they car cannot accurately measure the amount of air flow going into the motor. a stock air box is best unless you get your car dyno tuned.
agree
the cai intake makes the car run lean because they car cannot accurately measure the amount of air flow going into the motor. a stock air box is best unless you get your car dyno tuned.
Registered User
Joined: Jan 2004
Posts: 109
cai does make the car run LEANER but that doesn't mean it's running lean. It runs pretty rich from the factory, and the stock ecu can probably compensate for that minor mod.
The gfb bov is a POS. It wouldn't hold 22 psi at all.
The gfb bov is a POS. It wouldn't hold 22 psi at all.
Originally Posted by ilivas
cai does make the car run LEANER but that doesn't mean it's running lean. It runs pretty rich from the factory, and the stock ecu can probably compensate for that minor mod.
The gfb bov is a POS. It wouldn't hold 22 psi at all.
The gfb bov is a POS. It wouldn't hold 22 psi at all.
Are you running 22 pounds of boost and if so what setup are you running?
Registered User
Joined: Jan 2004
Posts: 109
Full TBE
uppipe
UTEC
BLitz SUS intake
Turbo XS FMIC
HKS BOV
Ultimate Racing 600 cc injectors
Walbro Fuel pump
Helix Oil catch can
Grounding kit
USDM STi 6 speed transmission
R180 rear diff
Turbo XS High performance boost controller
Forced Performance td05-18g turbo with ported turbine housing.
22 psi on pump gas and 26 psi on 100 octane.
uppipe
UTEC
BLitz SUS intake
Turbo XS FMIC
HKS BOV
Ultimate Racing 600 cc injectors
Walbro Fuel pump
Helix Oil catch can
Grounding kit
USDM STi 6 speed transmission
R180 rear diff
Turbo XS High performance boost controller
Forced Performance td05-18g turbo with ported turbine housing.
22 psi on pump gas and 26 psi on 100 octane.
Originally Posted by ilivas
Full TBE
uppipe
UTEC
BLitz SUS intake
Turbo XS FMIC
HKS BOV
Ultimate Racing 600 cc injectors
Walbro Fuel pump
Helix Oil catch can
Grounding kit
USDM STi 6 speed transmission
R180 rear diff
Turbo XS High performance boost controller
Forced Performance td05-18g turbo with ported turbine housing.
22 psi on pump gas and 26 psi on 100 octane.
uppipe
UTEC
BLitz SUS intake
Turbo XS FMIC
HKS BOV
Ultimate Racing 600 cc injectors
Walbro Fuel pump
Helix Oil catch can
Grounding kit
USDM STi 6 speed transmission
R180 rear diff
Turbo XS High performance boost controller
Forced Performance td05-18g turbo with ported turbine housing.
22 psi on pump gas and 26 psi on 100 octane.
Dirty Redhead
iTrader: (10)
Joined: Sep 2004
Posts: 7,204
From: Commuting? I don't know what that means anymore.
Car Info: 05 WRX Wagon (Crystal Gray)
Originally Posted by playa7
your CAI will make you run a little lean. and your bov will make you run a little rich(only between shifts or when you let off the throttle).
......thats what my friend told me. haha
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