The cold air intake debate
09-30-2004 | 12:23 AM
#121
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From: Reno, NV
Car Info: 1993/2000/2001 GF4 mostly red
Originally Posted by Donkey
Well most stand alone systems use speed density over mass air.Electromotive,Haltech,Motech,SDS..thats gotta tell ya something.
09-30-2004 | 02:04 PM
#122
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Joined: Sep 2004
Posts: 131
From: Virginia
Car Info: 02' WRX
Originally Posted by BAN SUVS
Tells you that it's cheaper. Look at it this way- MAF systems are more expensive than speed density systems. Try pricing an RS MAP sensor (the '00-'04 EJ25 uses speed-density) compared to a WRX or Phase I EJ25 MAF. Now ask yourself, why would a company as frugal as Subaru Choose the more expensive option? Anser: MAF is more acurate and dependable for forced induction applications. I must admit I'm confused about the switch back to MAF for the '05 EJ25 though.
09-30-2004 | 03:07 PM
#123
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Car Info: black my03 5mt wrx s/w
i wouldn't switch to speed density to avoid rich shifts while VTA!
remember, there are ALWAYS tradeoffs. saying that one system is ALWAYS better than another is myopic.
when you go to speed density anything you do that changes the VE of the motor has to be RETUNED around. pretty much all the bolt on mods we do commonly to our cars changes the VE of the motor... turbo backs, manifolds, turbo swaps, etc.
remember, there are ALWAYS tradeoffs. saying that one system is ALWAYS better than another is myopic.
when you go to speed density anything you do that changes the VE of the motor has to be RETUNED around. pretty much all the bolt on mods we do commonly to our cars changes the VE of the motor... turbo backs, manifolds, turbo swaps, etc.
09-30-2004 | 05:58 PM
#124
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Joined: Sep 2004
Posts: 131
From: Virginia
Car Info: 02' WRX
Originally Posted by ride5000
i wouldn't switch to speed density to avoid rich shifts while VTA!
remember, there are ALWAYS tradeoffs. saying that one system is ALWAYS better than another is myopic.
when you go to speed density anything you do that changes the VE of the motor has to be RETUNED around. pretty much all the bolt on mods we do commonly to our cars changes the VE of the motor... turbo backs, manifolds, turbo swaps, etc.
remember, there are ALWAYS tradeoffs. saying that one system is ALWAYS better than another is myopic.
when you go to speed density anything you do that changes the VE of the motor has to be RETUNED around. pretty much all the bolt on mods we do commonly to our cars changes the VE of the motor... turbo backs, manifolds, turbo swaps, etc.
09-30-2004 | 11:28 PM
#125
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From: Reno, NV
Car Info: 1993/2000/2001 GF4 mostly red
Originally Posted by Donkey
So with Mass Air do you just reset the computer and it recalibrates for all those parts you mentioned or do you have to retune as well the ECU settings?I would imagine its the same for both systems.But i agree there is definatly trade offs with each.I was just under the impression MAF was better suited for N/A motors and speed density for boosted applications.
10-01-2004 | 04:37 PM
#126
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From: Virginia
Car Info: 02' WRX
Originally Posted by BAN SUVS
There's usually no "resetting" involved. If you improve VE, then the extra air that flows automatically gets picked up by the MAF sensor, provided it has enough capacity.
10-11-2004 | 03:57 PM
#130
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From: Under your bed, in your closet, and in your head
Car Info: Corvette Z51
^^^
Wrong thread
If you're concerned that your engine bay is getting dirty, feel free to put if back on. If you like things the way they are, leave it be.
Wrong thread
If you're concerned that your engine bay is getting dirty, feel free to put if back on. If you like things the way they are, leave it be.
10-14-2004 | 08:21 AM
#132
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I may be mistaken but i believe you lose the intake temp sensor when you remove the MAF in favor of just the MAP sensor. I'm sure an aftermarket sensor could be fitted but if you just remove the MAF you may see some odd idle fueling as a result of quick variation in intake temperatures. It doesn;t seem to have much of an effect while moving because the air in the engine bay is moving aroung a lot and it therefore a more consistent temp than when your stopped and all the hot air is rising up into your intake.
10-14-2004 | 02:10 PM
#133
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Joined: Sep 2004
Posts: 131
From: Virginia
Car Info: 02' WRX
Originally Posted by ScoobieSnack
I may be mistaken but i believe you lose the intake temp sensor when you remove the MAF in favor of just the MAP sensor. I'm sure an aftermarket sensor could be fitted but if you just remove the MAF you may see some odd idle fueling as a result of quick variation in intake temperatures. It doesn;t seem to have much of an effect while moving because the air in the engine bay is moving aroung a lot and it therefore a more consistent temp than when your stopped and all the hot air is rising up into your intake.
10-27-2004 | 02:20 PM
#134
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I can't believe this topic is getting out of hand this much. Absolutly pathetic.
First off COLD AIR=more air/more dense. More Air=more fuel. More air and more fuel= more power. A "cold air intake" though it may not "cool" down the intake temps a huge amount will allow MORE airflow compared to the stock filter. If you are bringing in slightly cooler air that will HELP bring the over all temp down just a little bit. You can not compare a flowing turbo to an oven in cold weather. They are 2 different things.
"COLD AIR INTAKES" will not give you the power they preach, nor does any other item but it will slightly lower your intake temps, and allow MORE air to travel into the engine.
First off COLD AIR=more air/more dense. More Air=more fuel. More air and more fuel= more power. A "cold air intake" though it may not "cool" down the intake temps a huge amount will allow MORE airflow compared to the stock filter. If you are bringing in slightly cooler air that will HELP bring the over all temp down just a little bit. You can not compare a flowing turbo to an oven in cold weather. They are 2 different things.
"COLD AIR INTAKES" will not give you the power they preach, nor does any other item but it will slightly lower your intake temps, and allow MORE air to travel into the engine.
