Evo Do's and Don't's
u know, this was sorta the bases of what I was thinking as well, except for all the words that I don't understand well.
the wave frequency is disturbed and the build up of air inside the air box isn't translated to MAF if you have an open element, which builds up air later than the stock air box.
that combine with the fact that the wave length is changed due to the straight pipe designs that doesn't give any fins inside the air tube or filters turbulance like the stock air box does.
this is why the aftermarket intake translates into lean spots, because of the turbulant air type that doesn't allow travel back and forth inside the intake tube, which is critical for the air to dispense at the right time to the turbo.
Other intake designs compensate by having a ballooned tube design, where it does somewhat stores and filters the air, but it should happen pre intake tube.
the wave frequency is disturbed and the build up of air inside the air box isn't translated to MAF if you have an open element, which builds up air later than the stock air box.
that combine with the fact that the wave length is changed due to the straight pipe designs that doesn't give any fins inside the air tube or filters turbulance like the stock air box does.
this is why the aftermarket intake translates into lean spots, because of the turbulant air type that doesn't allow travel back and forth inside the intake tube, which is critical for the air to dispense at the right time to the turbo.
Other intake designs compensate by having a ballooned tube design, where it does somewhat stores and filters the air, but it should happen pre intake tube.
Originally Posted by nubby
The Evo uses a Karman-type airflow sensor that has a "bluff body" which extends into the intake stream. Laminar flow builds up on each side of this bluff body, and alternately breaks, and the frequency of this oscillation can then be interpreted by the ECU, and translated into a flow rate. This is why the the MAF sensor output is a somewhat sinusoidal waveform.
That said, the bluff body must be allowed to have laminar flow build up on it, so it won't work in turbulent airflow, and I think the common conception is that most aftermarket open intakes have some degree of turbulence that that prevents the alternating build up of laminar flow on the bluff body, which would either cause the form to A) be corrupted, or B) effect the natural frequency the system oscillates at for a given flow rate.
My theory is that if an aftermarket open filter type elements does indeed have some sort of turbulence that corrupts the signal, that would be obvious on any plot from a digital oscillosope from the MAF. Missing peaks on the waveform, etc.. As far as affecting the natural frequency, you think you would be able to determine if that was the case from looking at a wide band A/F meter, and seeing if the open filter element made a big difference to A/F ratio.
Has anyone done any testing? As far as I know the open filter debate is still, well, open.
That said, the bluff body must be allowed to have laminar flow build up on it, so it won't work in turbulent airflow, and I think the common conception is that most aftermarket open intakes have some degree of turbulence that that prevents the alternating build up of laminar flow on the bluff body, which would either cause the form to A) be corrupted, or B) effect the natural frequency the system oscillates at for a given flow rate.
My theory is that if an aftermarket open filter type elements does indeed have some sort of turbulence that corrupts the signal, that would be obvious on any plot from a digital oscillosope from the MAF. Missing peaks on the waveform, etc.. As far as affecting the natural frequency, you think you would be able to determine if that was the case from looking at a wide band A/F meter, and seeing if the open filter element made a big difference to A/F ratio.
Has anyone done any testing? As far as I know the open filter debate is still, well, open.
Originally Posted by thebluesky
it can't be said enough. TUNING, or else you've wasted your time modding.
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Originally Posted by matt55
Do not think that you have a waranty .
Do not let anyone fill your T-case with anything else than OEM dynaqueen . And by anyone I mean the DEALER also .
Do not let your car wheelhop if doing a aggressive launch .
Do not think that the Advan's will stop in the snow .
Do not let anyone fill your T-case with anything else than OEM dynaqueen . And by anyone I mean the DEALER also .
Do not let your car wheelhop if doing a aggressive launch .
Do not think that the Advan's will stop in the snow .
http://www.socalevo.net/forums/viewtopic.php?t=7599
Thread Starter
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Joined: Feb 2005
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From: Hazard,KY
Back to matt55's reply...I bought my evo used and whoever had it before my didnt know how to drive a standard. I buy it a month ago I only got to drive it for about 3 days before the transfercase messes up on me and the dealer was giving me the story about the " this may not be covered by warranty " But ends up the transfer case was out and sumthin was wrong with the ring and pinion. But luckily the dealer called me 2 days ago and said it IS covered by warranty.
Originally Posted by Rookie
Back to matt55's reply...I bought my evo used and whoever had it before my didnt know how to drive a standard. I buy it a month ago I only got to drive it for about 3 days before the transfercase messes up on me and the dealer was giving me the story about the " this may not be covered by warranty " But ends up the transfer case was out and sumthin was wrong with the ring and pinion. But luckily the dealer called me 2 days ago and said it IS covered by warranty.
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Joined: Feb 2005
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From: Hazard,KY
Yea matt55 i know from hearing all the stories about the void warranties on the EVO's when that happened i had a bad feelin i was gonna be out sum BIG money.....now I will tell the dealership to but how can i tell if they don't ? i mea ni aint gonna be there when they put it in.
Originally Posted by ronitlancer
I'm probably gonna look like the BIGGEST ****ing idiot and I will lose all respect that I didnt have 
But what exactly is "tuning" (im trying to learn dont bite)
But what exactly is "tuning" (im trying to learn dont bite)
Originally Posted by Rookie
Yea matt55 i know from hearing all the stories about the void warranties on the EVO's when that happened i had a bad feelin i was gonna be out sum BIG money.....now I will tell the dealership to but how can i tell if they don't ? i mea ni aint gonna be there when they put it in.
Originally Posted by TurboWill
Basically you have a computer that controls your engine. The ECU(brain). There are ton's of company's that can tune your ECU to the mods you get done. This will give you optimum power.
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Joined: Feb 2005
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From: Hazard,KY
That's a big 10-4... Now that the car is warrantied they are giving me the run around on getting it done and back to me.....keep giving me excuses. on why it isnt ready yet. back to getting my car tuned after mods....I'm from KY where would i have to send it to or go to have it done ? Oh BTW thats a HOTT s-dime ! ! ! !
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http://buschurracing.com/EVO_Stage1.html
i think this is how u should do it you dont have to use buschur parts but do it like there stages are set up.
i think this is how u should do it you dont have to use buschur parts but do it like there stages are set up.