Short Ram Intake: IMPORT TUNER
05-11-2010, 02:04 PM
#21
I agree. I was running the fujita CAI on my 07. I got rid of it and went back to stock. Retuned last week and gained 7.7 tq/12.4hp. The piping was to big causing mid rpm power loss. The only thing that I would change is the stock rubber intake hoses. A hose with no ripples.
05-11-2010, 04:38 PM
#23
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I agree. I was running the fujita CAI on my 07. I got rid of it and went back to stock. Retuned last week and gained 7.7 tq/12.4hp. The piping was to big causing mid rpm power loss. The only thing that I would change is the stock rubber intake hoses. A hose with no ripples.
05-11-2010, 07:59 PM
#24
Registered User
Please explain these dynamics?
Are you referring to the fact that they are suggesting that the literal airflow around the MAF is whats throwing it off? So basically, where fluid dynamics are involved, lets pretend that the filter element is causing the bulk of the faster air to flow on the upper portion of the pipe where the MAF is located. The MAF reads this as a consistency throughout the entire pipe, when in fact, the bottom portion of the pipe has much less and slower air flowing through it as compaired to the top. Is this correct?
So if this is their argument, then "uneven" airflow, by itself and intake temps aside, throughout the pipe causes such a drastic change by the ECU in A/F ratio that it could possibly be negating a 10WHP difference?!
Somehow that is incredibly hard to believe. I understand flow dynamics play a huge role in the exhaust system, such as they effect scavenging, but i fail to see a similar role played by flow dynamics in the intake system.
I understand that the flow dynamics are important in intake systems, but 10WHP important? Really??
Are you referring to the fact that they are suggesting that the literal airflow around the MAF is whats throwing it off? So basically, where fluid dynamics are involved, lets pretend that the filter element is causing the bulk of the faster air to flow on the upper portion of the pipe where the MAF is located. The MAF reads this as a consistency throughout the entire pipe, when in fact, the bottom portion of the pipe has much less and slower air flowing through it as compaired to the top. Is this correct?
So if this is their argument, then "uneven" airflow, by itself and intake temps aside, throughout the pipe causes such a drastic change by the ECU in A/F ratio that it could possibly be negating a 10WHP difference?!
Somehow that is incredibly hard to believe. I understand flow dynamics play a huge role in the exhaust system, such as they effect scavenging, but i fail to see a similar role played by flow dynamics in the intake system.
I understand that the flow dynamics are important in intake systems, but 10WHP important? Really??
Now the stock airbox doesn't present this problem due to the design of the filter and its inherent effects on the flow profile (picture not a cone, but more of a flat wall representing the velocity of the air). Because it doesn't have this problem, the ECU ends up reading it correctly and doesn't make the same mistake that it can with other short ram intake filters. The CAI, because of the additional tubing, allows the flow profile to settle down and is subsequently read by the MAF/ECU correctly.
Now is it 10whp? I wouldn't guess so, but the data seems to suggest that it is. Also remember that the dyno data for short ram intakes are inherently skewed to show more horsepower - how often do you drive with your hood open and the filter sucking in all that fresh air? So I wouldn't assume 10whp, but I've seen stranger things happen for simpler reasons than this, so it's not entirely surprising.
Hopefully that answered your question.
06-29-2010, 09:23 AM
#27
One big problem of that article was their definition of a velocity stack. What they count as one presents a big problem with me. The stack should be on the end of the maf opening like the stillen/JWT cone. But they don't use that style to test their theory about a v-stack possibly being a varible affecting the SRI's results. They use the generic type cone with some bastardization of a v-stack on the very end of the cone filter. Not the same thing.
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