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#16
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Manufactures most certainly take into account full throttle performance. Media testing has a profound affect on sales. When assessing the issue the layman should observe and give thought to the relative area of the OEM filter enclosure, as compared to the area of the inlet tract. Rather that guess in regard to the pros and cons, I can put forward practical evidence. I have some experience with production car road circuit racing, whereby the regulations required that the OEM or an exactly fitting filter of alternative manufacture, be used. I became aware that several competitors were cheating by modifying there filter elements. As a result I carried out a simple test to establish if they were placing me at a disadvantage. During practice, I removed the filter from my car, (On this occasion a Subaru FF1). The result was no improvement in lap times, which had been established as absolute maximum performance. As a result I refrained from protesting against the opposition, leaving them in dreamland.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#17
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Check this link out-->
http://www.autospeed.com/cms/article.html?&A=0629 It is an Autospeed article titled, "Eliminating Negative Boost". Perhaps a manometer like the one that is used in the article can be used to measure the effectiveness of replacing the stock air filter with an STi one.
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Kevin Thomas 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Auto) 13.03@100mph 1989 2.7ltr Subaru XT6 (AWD/Auto) 15.912@85.93mph 1996 3.3ltr SVX (AWD/Auto) 15.070@91.38mph ***R.I.P*** 2010 RAV4 AWD Sport (13.717 @ 99.19mph ) 2015 Honda Fit LX CVT (15.2 @ 90mph) |
#18
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For anybody who wants to remove a lot of guesswork and have, or are building, a data gathering ECU interface that can record MAF voltage and engine rpm, they can actually perform an experiment to settle the matter. Choose any air filter(s) you want, or no air filter at all, and plot the airflow against engine rpm at full throttle. The inlet setup that has the greatest area under the MAF voltage curve wins. I'd be surprised if there were no differences at all. Whether the differences are significant or not is a different matter.
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I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely in your thoughts advanced to the state of Science, whatever the matter may be. Sir William Thomson |
#19
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Briefly consider the principal of an atomizer, wave shape of the airflow, variations across the conducting cross section and the affect of RPM, all in relation to the figures published. The exercise requires expertise obviously beyond the ability of the author.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#20
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Jerry 2005 Baja Turbo 2008 Ford Crown Victoria Police Interceptor jnj7707@yahoo.com |
#21
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There is a simple piece of software for this type of measurement. It is called a 'Pocketlogger'. http://www.pocketlogger.com/?pid=obdii I have one and have used it in the past. I have never figured out how to put the graphs onto my computer to upload the data that I recorded. If someone else here has this or a similar product, perhaps they can post up the data. It is a nifty piece of software. Good at looking at ECU codes and removing them too.
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Kevin Thomas 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Auto) 13.03@100mph 1989 2.7ltr Subaru XT6 (AWD/Auto) 15.912@85.93mph 1996 3.3ltr SVX (AWD/Auto) 15.070@91.38mph ***R.I.P*** 2010 RAV4 AWD Sport (13.717 @ 99.19mph ) 2015 Honda Fit LX CVT (15.2 @ 90mph) |
#22
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Kevin Thomas 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Auto) 13.03@100mph 1989 2.7ltr Subaru XT6 (AWD/Auto) 15.912@85.93mph 1996 3.3ltr SVX (AWD/Auto) 15.070@91.38mph ***R.I.P*** 2010 RAV4 AWD Sport (13.717 @ 99.19mph ) 2015 Honda Fit LX CVT (15.2 @ 90mph) |
#23
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#24
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so... ummm... not worth it?
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1992 Pearl White/Black Onyx Subaru Alcyone SVX LS-L Donating Forum Member In Good Standing JDM 4.11 Geared Transmission JDM 'ALCYONE' Rear Panel JDM 'BOXER' Eingngine Cover JDM 'SVX' Hood Badge L-Edition Suede Rear Seats |
#25
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#26
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Sorry, I do not mean to take this thread out of context. Just wanted to show a means to measure the difference in effectiveness of airflow between the stock air filter and the STi air filter. That's all!
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Kevin Thomas 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Auto) 13.03@100mph 1989 2.7ltr Subaru XT6 (AWD/Auto) 15.912@85.93mph 1996 3.3ltr SVX (AWD/Auto) 15.070@91.38mph ***R.I.P*** 2010 RAV4 AWD Sport (13.717 @ 99.19mph ) 2015 Honda Fit LX CVT (15.2 @ 90mph) Last edited by Myxalplyx; 05-15-2007 at 04:45 AM. |
#27
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#28
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"Hmm, so how much loss is there through the filter? Very nearly nothing at all! And guess what? That is the case on nearly every car - the standard filter poses very little restriction at all in the system. Look at the Before Filter and After Filter lines - don't get much closer than that, do ya? In the Audi's case, the filter makes up 1 inch of water pressure drop out of the 32 inches total pressure drop that is present. In other words, 97 per cent of the flow restriction of the intake is not the filter. And to hammer home the point, when you make actual on-car measurements, it's pretty well always like this. The airfilter as a halitosis-suffering, smelly, dirty, hairy negative pressure is a total frame-up created by those with vested interests in selling drop-in aftermarket replacement filters." Although it supported what you spoke of earlier, somehow you failed to understand that.
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Kevin Thomas 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Auto) 13.03@100mph 1989 2.7ltr Subaru XT6 (AWD/Auto) 15.912@85.93mph 1996 3.3ltr SVX (AWD/Auto) 15.070@91.38mph ***R.I.P*** 2010 RAV4 AWD Sport (13.717 @ 99.19mph ) 2015 Honda Fit LX CVT (15.2 @ 90mph) |
#29
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I edit a lot of articles in real life so maybe it's just me.
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Jerry 2005 Baja Turbo 2008 Ford Crown Victoria Police Interceptor jnj7707@yahoo.com |
#30
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The weight behind the statement made, directly depends on the evidence which has been presented. Therefore the statement carries no weight and is worthless in this context, however true it may be.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
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