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Old 10-03-2005, 03:43 PM   #1
cs11elonce
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Default Any idea why Cobb and other ECU companies give their mappings with Stock Intake box?

Does anyone know why Cobb only provides AccessPort mappings for setups containing the stock intake box?

When I purchased my 02 WRX it already had a cold air, turbo back exhaust and up-pipe installed.

Am I going to have to track down a stock intake box now to use the AccessPort?

I thought cold air's were normally a beneficial upgrade...
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Old 10-03-2005, 03:44 PM   #2
HOV
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CAI is not an upgrade for the WRX. It can actually reduce performance.
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Old 10-03-2005, 03:51 PM   #3
sportz135
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It is possible to tune for a CAI, but it is usually pretty difficult and i'd imagine you'd need a utec or street tuner and a dyno
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Old 10-03-2005, 03:52 PM   #4
nick04263
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put the stock box back on.
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Old 10-03-2005, 05:20 PM   #5
KingOfSiam
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Cobb has a map for a certain brand of short ram intakes. I forget which one.
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Old 10-03-2005, 05:24 PM   #6
2.5 SUBY
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I too will soon be getting a cat back,UP and Cobb AP. That way next spring i can just hook up my DP and run stage 2. I run APS short ram right now. Wonder how that will be
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Old 10-03-2005, 05:27 PM   #7
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Quote:
Originally Posted by KingOfSiam
Cobb has a map for a certain brand of short ram intakes. I forget which one.
injen
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Old 10-03-2005, 05:33 PM   #8
chinoWRXL
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cobb has their own sr too. buddy has it on sti, blue cone filter didn't stay blue for long. but AFIK it has a fin that helps stabalize intake air flow to account for MAF misreadings. running a map w/ a cold air intake shouldn't make the map unusable, just not maximized.

my 2 cents
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Old 10-03-2005, 06:20 PM   #9
chinoWRXL
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SF Intake (Short Ram) $185.00
Available in Silver or Black
Requires no tuning as it retains the stock size tubing for the MAF sensor.
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Old 10-03-2005, 06:21 PM   #10
chinoWRXL
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Quote:
Originally Posted by chinoWRXL
SF Intake (Short Ram) $185.00
Available in Silver or Black
Requires no tuning as it retains the stock size tubing for the MAF sensor.
from a distributor of cobbs
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Old 10-03-2005, 06:35 PM   #11
Lexington
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intil you are making rediculous power, the stock airbox is PLENTY.

Besides.. when you pop your hood and all ppl see is your stock airbox stock bov stock intercooler, blah blah.. they'll think you're just a slow WRX =)
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Old 10-04-2005, 12:54 PM   #12
Scooby921
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Quote:
Originally Posted by cs11elonce
Does anyone know why Cobb only provides AccessPort mappings for setups containing the stock intake box?
They do this because it is easier to tune the maps for one specific intake than to try and create individual maps for all the different CAI / Short-ram intakes on the market. The stock one is more than sufficient, and the majority of people who read these forums before modding their car decide to stick with stock.

In your case, the previous owner didn't read these forums. You shouldn't need to go back to a stock intake. You just won't be seeing any performance gains from having an aftermarket CAI.
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Old 10-04-2005, 07:39 PM   #13
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I believe the stock airbox will almost always give stable MAF readings, while CAI's produce erratic readings that are hard to tune for. Thus, I have a short ram which I'm pretty sure doesn't do much but looks bling!
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Old 10-04-2005, 10:04 PM   #14
BoostinEJ20
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exactly waht evey 1 else was saying...they do it cause not all intakes are alike...besides stock airbox...they can guarantee their maps when all sorts of other intake characteristics exhist, and tryin to make maps for all would just not be worth it....now they might make maps in the future for their own stuff, like their own new intake and maybe one for their new tmic under development...but thats just so we buy more of their great products
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Old 10-05-2005, 11:37 AM   #15
chinoWRXL
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friend w/ 05 sti that had the COBB SR intake did a basline dyno pull. no EM. a/f's all good...
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Old 10-05-2005, 12:49 PM   #16
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gernerally...under hard accelleration CAI is a downgrade on the wrx unless your making a lot of power to the ground. if im mistaken i believe thats somewhere over 300whp. the reason cai are bad is because usually the diameter is larger over stock, and creates air turbulance under a large load. the turbulance the air causes results in incorrect MAF sensor readings, making ur car act no where near what you would want it to. since cobb has a map of stage 2, it does not qualify for a CAI mod nor a map. the stock air box has been proven to hold its own up to 300whp compaired to what an aftermarket could provide to that point
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Old 10-05-2005, 01:07 PM   #17
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COBB released a Stage 2 map for WRX's with an Injen CAI. Since I have an Injen CAI sitting in a box on my bedroom floor I called COBB to ask about that new map. Their response?

"It makes no difference if you have the Injen CAI in there or not. You're still better off with the stock box even though we have a map for it".

Good enough for me.
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Old 10-05-2005, 03:28 PM   #18
Beer:30
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Because the stock airbox is properly engineered by professional automotive engineers @ FHI.
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Old 10-05-2005, 10:21 PM   #19
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I never understood why people put a cold air intake on a turbocharged motor. It draws cold air from outside the engine bay but once air goes through the turbo, it gets hot and goes then goes through the intercooler and gets cooled down. So, I dont see the point to it.
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Old 10-06-2005, 07:49 AM   #20
quazimoto
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Quote:
Originally Posted by rezs2jen
gernerally...under hard accelleration CAI is a downgrade on the wrx unless your making a lot of power to the ground. if im mistaken i believe thats somewhere over 300whp. the reason cai are bad is because usually the diameter is larger over stock, and creates air turbulance under a large load. the turbulance the air causes results in incorrect MAF sensor readings
Its because most CAI are a larger diameter than the stock air box sensor housing/orifice causing the MAF to no longer be calibrated.
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Old 10-06-2005, 07:52 AM   #21
Wolfen42
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Quote:
Originally Posted by IIdiceII
I never understood why people put a cold air intake on a turbocharged motor. It draws cold air from outside the engine bay but once air goes through the turbo, it gets hot and goes then goes through the intercooler and gets cooled down. So, I dont see the point to it.

Because when it's being compressed at the turbo you still want it to be colder.
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Old 10-06-2005, 07:54 AM   #22
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Quote:
Originally Posted by IIdiceII
I never understood why people put a cold air intake on a turbocharged motor. It draws cold air from outside the engine bay but once air goes through the turbo, it gets hot and goes then goes through the intercooler and gets cooled down. So, I dont see the point to it.
I used to think the same thing untill someone shed some light on the subject.if temp A goes onto the turbo 10 degrees colder than temp B its relative to say that temp A will still come out 10 degrees colder.Plus the fact that the intake air temperature is being measured at the MAF which plays a part in timing and fueling.The IAT sensor and MAF are intergraded into one unit.
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Old 10-06-2005, 08:32 AM   #23
f4phantomii
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Read the Intake FAQ and it should answer your question.

-Michael
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Old 10-06-2005, 01:16 PM   #24
Dueysan
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Stock intake is good up to 300whp as resz2jen has said. "Cold Air Intakes" are just another piece of expensive junk sold to noobs. Even the name is total BS. They don't do anything except empty your pocket and line the pocket of the hundreds of aftermarket makers who will sell you anything at an inflated price. If you want "colder air" buy a bigger intercooler and a waterspray (or injection system).
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Old 10-06-2005, 02:38 PM   #25
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Quote:
Originally Posted by Lexington
intil you are making rediculous power, the stock airbox is PLENTY.

Besides.. when you pop your hood and all ppl see is your stock airbox stock bov stock intercooler, blah blah.. they'll think you're just a slow WRX =)
lol, if you're still running a stock intercooler, you are just a slow WRX
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