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Old 08-29-2011, 08:06 PM   #1
2008scooby18
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Member#: 177151
Join Date: Apr 2008
Location: Richmond, Va
Vehicle:
06 wrx

Default Stage 1 question

Just got my Cobb ap today, and I tuned it to the stage 1 map. I have an 06 wrx with a k&n typhoon short ram, my a/f ratio is 14.6-7 cruising, 11.1 in wot, and right when I let off it shoots up to 20.3, is this normal? And also my boost goes up to 16.5 or so.. That alright? Sorry, I feel like an idiot asking, but I'm learning, and I tried to search and have gotten partial answers.

Also I have a catless invidia turboback setup yet to be on he car, should I try to get the stock airbox or Cobb sf intake for stage II?
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Old 08-29-2011, 09:11 PM   #2
explosivo
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Member#: 175579
Join Date: Mar 2008
Chapter/Region: SWIC
Location: Gilbert
Vehicle:
2006 WRX TR
OBP

Default

cruising your car tries to keep a stoich mixture of 14.6-7 so this is normal.

When you let off the gas, you will always see the AFR go up to about 20 or so, I thought it was due to more air incoming then fuel, but apparently if you WOT then pop into neutral or let off the gas completely the injectors stop firing and won't start again until you hit the pedal again or hit your idle RPM's. I'm not sure if that's 100% accurate, but it happens on every boosted car I've seen.

The stock airbox on the WRX is good for up over 300 WHP, but the COBB is also a good alternative. The cobb is more desired then others due to it having the air straighteners that smooth out any turbulence to give the MAF a more accurate picture of the incoming air.
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Old 08-29-2011, 09:11 PM   #3
explosivo
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Member#: 175579
Join Date: Mar 2008
Chapter/Region: SWIC
Location: Gilbert
Vehicle:
2006 WRX TR
OBP

Default

cruising your car tries to keep a stoich mixture of 14.6-7 so this is normal.

When you let off the gas, you will always see the AFR go up to about 20 or so, I thought it was due to more air incoming then fuel, but apparently if you WOT then pop into neutral or let off the gas completely the injectors stop firing and won't start again until you hit the pedal again or hit your idle RPM's. I'm not sure if that's 100% accurate, but it happens on every boosted car I've seen.

The stock airbox on the WRX is good for up over 300 WHP, but the COBB is also a good alternative. The cobb is more desired then others due to it having the air straighteners that smooth out any turbulence to give the MAF a more accurate picture of the incoming air.
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Old 08-29-2011, 10:06 PM   #4
2Fast4U1DAY
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Member#: 250152
Join Date: Jun 2010
Chapter/Region: MAIC
Location: Pennsylvania
Vehicle:
2006 WRX Limited
OBP

Default

Quote:
Originally Posted by 2008scooby18
Just got my Cobb ap today, and I tuned it to the stage 1 map. I have an 06 wrx with a k&n typhoon short ram, my a/f ratio is 14.6-7 cruising, 11.1 in wot, and right when I let off it shoots up to 20.3, is this normal? And also my boost goes up to 16.5 or so.. That alright? Sorry, I feel like an idiot asking, but I'm learning, and I tried to search and have gotten partial answers.

Also I have a catless invidia turboback setup yet to be on he car, should I try to get the stock airbox or Cobb sf intake for stage II?
You should definately get the Cobb SF, Stock intake, or AEM CAI for even the Stage 1 tune. Their maps are setup for these intakes and these intakes only. Want to keep the K&N? Get a protune.

Last edited by 2Fast4U1DAY; 08-29-2011 at 11:17 PM.
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Old 08-30-2011, 05:47 PM   #5
2008scooby18
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Default

So my numbers are normal? And I ordered my Cobb sf this morning, it will be here Friday so that's when the exhaust and dp will go on, but is my car safe to drive like this until then? (stage 1 and k&n typhoon sri)
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Old 08-30-2011, 06:08 PM   #6
2Fast4U1DAY
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Member#: 250152
Join Date: Jun 2010
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Location: Pennsylvania
Vehicle:
2006 WRX Limited
OBP

Default

Quote:
Originally Posted by 2008scooby18
So my numbers are normal? And I ordered my Cobb sf this morning, it will be here Friday so that's when the exhaust and dp will go on, but is my car safe to drive like this until then? (stage 1 and k&n typhoon sri)
Not really. It should be 13.5 psi +/- .7 psi tapering to ~9psi at redline. So take 16.5-14.2 and you are overboosting by ~2.3 psi with the wrong intake on. Not cool.

Also by looking at the AP for AFR isn't very accurate. If you really want to watch AFR get a wideband.

You are going to have to get a data log of a third gear pull from ~2500 to near redline (if you can do so safely) in order to say if its safe or not.
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Old 08-30-2011, 06:19 PM   #7
2008scooby18
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06 wrx

Default

Alright thanks for the help, I'm just gonna park the car until my intake comes in, so once I put the Cobb sf on, I won't be overboosting?
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Old 08-30-2011, 06:38 PM   #8
2Fast4U1DAY
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Member#: 250152
Join Date: Jun 2010
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Location: Pennsylvania
Vehicle:
2006 WRX Limited
OBP

Default

Quote:
Originally Posted by 2008scooby18
Alright thanks for the help, I'm just gonna park the car until my intake comes in, so once I put the Cobb sf on, I won't be overboosting?
You shouldn't. I am running Invida catless TBE, Cobb SF intake + airbox, and Cobb Stg 2 on my 06 WRX, and I see an initial spike to ~17 but it drops right away to ~16 (it is supposed to be 15.2 +/- .7 psi tapering to ~10 psi near redline), so I'm within the limits.
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Old 08-30-2011, 06:58 PM   #9
2008scooby18
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Default

Alright, I'm gonna be running your exact setup so hopefully all is good come Friday
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