Air filter shield to fix unstable idle on Evo 10s
#1
Air filter shield to fix unstable idle on Evo 10s
I think this has been discussed in the past, but I didn't see any threads titled with this fix. Anyhow, the Evo 10 MAF hotwire is apparently very sensitive to small amounts of airflow and probably air temperature differences. For those with exposed element (cone) air filters, crappy idle during coast down and when the cooling fans are running (air conditioning, stuck in traffic) is likely due, in-part, to air flow/temperature fluctuations on the MAF hotwire. A good size shield that blocks airflow from the radiator area can make a very big improvement in idle stability.
Last edited by mrfred; Jul 25, 2011 at 10:50 AM.
#3
We include one in our intake kit for the EVO X.
http://www.amsperformance.com/cart/A...-Polished.html
http://www.amsperformance.com/cart/A...-Polished.html
#4
Evolving Member
I have exactly same trouble. my car is 2008 Evo X GSR and using exposed cone. It has a heat protect board, but still unstable idle ( randomly popping noise and rpm needle swings. )
I think this has been discussed in the past, but I didn't see any threads titled with this fix. Anyhow, the Evo 10 MAF hotwire is apparently very sensitive to small amounts of airflow and probably air temperature differences. For those with exposed element (cone) air filters, crappy idle during coast down and when the cooling fans are running (air conditioning, stuck in traffic) likely due, in-part, to air flow/temperature fluctuations on the MAF hotwire. A good size shield that blocks airflow from the radiator area will make a very big improvement in idle stability.
#6
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from my experience it is pointless to fit all those screens. It's much better to buy AEM box like this http://www.aemintakes.com/search/pro...x?Prod=21-678C , it helped me stabilize idle on several cars and reduce intake temperatures.
#7
iTrader: (10)
I planned on getting one for my Primo 3.5" intake but honestly, I have not had any idle issues at all, even with a ported head and kelford -b cams, 1680cc injectors, the car seems to idle just dandy, even with the AC on and 100°F+ outside. My car is a 2008 too, I have the stock air snorkel set to fit over/towards it but I wonder if having a relocated BOV helps or acts slightly as a heat shield since it is right in the path of that fan air.
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#8
iTrader: (10)
from my experience it is pointless to fit all those screens. It's much better to buy AEM box like this http://www.aemintakes.com/search/pro...x?Prod=21-678C , it helped me stabilize idle on several cars and reduce intake temperatures.
#10
I planned on getting one for my Primo 3.5" intake but honestly, I have not had any idle issues at all, even with a ported head and kelford -b cams, 1680cc injectors, the car seems to idle just dandy, even with the AC on and 100°F+ outside. My car is a 2008 too, I have the stock air snorkel set to fit over/towards it but I wonder if having a relocated BOV helps or acts slightly as a heat shield since it is right in the path of that fan air.
#12
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#13
Evolved Member
iTrader: (2)
Huh? It's the wiring that's sensitive to fluctuations in heat? First I've heard of that... I thought it was hot air being blown directly into the intake.
My intake is shoved down into the front bumper and I have never experienced this, which makes me think the sensitive wire thing is not the case.
The wire itself is copper and the resistance of copper is nowhere near as sensitive to temperature changes as metals like platinum, which is used in thermocouples/resistance temperature detectors.
Anyways, shove the filter into the bumper and you'll be just fine. Just don't go into water >1ft deep
My intake is shoved down into the front bumper and I have never experienced this, which makes me think the sensitive wire thing is not the case.
The wire itself is copper and the resistance of copper is nowhere near as sensitive to temperature changes as metals like platinum, which is used in thermocouples/resistance temperature detectors.
Anyways, shove the filter into the bumper and you'll be just fine. Just don't go into water >1ft deep
#15
EvoM Community Team
iTrader: (15)
Huh? It's the wiring that's sensitive to fluctuations in heat? First I've heard of that... I thought it was hot air being blown directly into the intake.
My intake is shoved down into the front bumper and I have never experienced this, which makes me think the sensitive wire thing is not the case.
The wire itself is copper and the resistance of copper is nowhere near as sensitive to temperature changes as metals like platinum, which is used in thermocouples/resistance temperature detectors.
Anyways, shove the filter into the bumper and you'll be just fine. Just don't go into water >1ft deep
My intake is shoved down into the front bumper and I have never experienced this, which makes me think the sensitive wire thing is not the case.
The wire itself is copper and the resistance of copper is nowhere near as sensitive to temperature changes as metals like platinum, which is used in thermocouples/resistance temperature detectors.
Anyways, shove the filter into the bumper and you'll be just fine. Just don't go into water >1ft deep