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hopeydaze said:I'm curious - why make the change? I have a 997.1 GT3 and I would hate to think I'm missing out on something
RL1989 said:I work for an OEM designing induction systems...given the filter surface area on a 997 there will be absolutely zero real world difference in performance, however there will be a dramatic increase in dust particle size and quantity ingested into your high performance engine.
Stick with the standard filter element and replace with genuine parts on a regular basis. The difference between a clean and dirty filter element is larger than the difference between a standard and aftermarket filter.
Phil 997 said:RL1989 said:I work for an OEM designing induction systems...given the filter surface area on a 997 there will be absolutely zero real world difference in performance, however there will be a dramatic increase in dust particle size and quantity ingested into your high performance engine.
Stick with the standard filter element and replace with genuine parts on a regular basis. The difference between a clean and dirty filter element is larger than the difference between a standard and aftermarket filter.
Have you looked at a BMC filter , they actually filter to a smaller micron particle than the stock paper one , so interested to understand how it can take in more particles , seems it would be less . I am no filtration expert so keen to understand the technicalities of your post. :dont know: :?: re whether they actually do anything performance wise is always a great topic of discussion , personally having have them on both my gen1 and gen2 non GT cars, I am in the camp that says YES you can feel a bit more but more importantly IMO that horrific wheezy flat 6 engine sound that the stock filter gives will go and the car will sound like it breathes so much better and rev much more freely. I am always happy to debate it with those that have tried a sports filter but most of the time those against have never actually tried it. Do note that if the car has a Porsche Warranty then you cant do it. :thumb: :thumb:
Phil 997 said:Thats just the type of answer I like , and an excellent counter argument for the sports filters .
Thank you for explaining in detail it will certainly allow for a better understanding about filters and allow us to at least go in eyes open if we choose to do this mod.
The performance gains are at best minimal I agree, but my big win with them is the freely breathing engine. whats your thoughts on the way they rev more freely and sound less wheezy without the restrictive paper filter and with a sports filter . can this be overcome with a better solution than a sports filter or is that just the downside of having 98% filtration .
RL1989 said:Phil 997 said:Thats just the type of answer I like , and an excellent counter argument for the sports filters .
Thank you for explaining in detail it will certainly allow for a better understanding about filters and allow us to at least go in eyes open if we choose to do this mod.
The performance gains are at best minimal I agree, but my big win with them is the freely breathing engine. whats your thoughts on the way they rev more freely and sound less wheezy without the restrictive paper filter and with a sports filter . can this be overcome with a better solution than a sports filter or is that just the downside of having 98% filtration .
No problem,
How the engine revs is determined by the reciprocating mass (i.e flywheel) and the available torque (Directly related to volumetric efficiency).
As mentioned the filter element is only a small portion of the overall intake losses, so a small improvement in a small portion of the overall intake losses will have very little impact on volumetric efficiency and therefore torque.
In my experience exhaust back pressure losses impact an engines volumetric efficiency more than intake losses anyway.
The data doesn't lie, the only measurable impact on how freely the engine breathes with a new filter is the improvement in pressure loss within the induction system, and we know this to be very insignificant. Anything you feel is your perception given the change you know you have made :thumb:
As mentioned i would look to replace the standard element regularly if you want to keep filter losses to a minimum.
If you wanted to reduce intake losses significantly then replacing the entire air cleaner with a cone filter would improve the losses i would imagine. However this opens up a new can of worms with hot air ingestion.... warmer air reduces charge density - undoing all your good work on pressure loss. The stock system is a cold air intake, most of the aftermarket kits you see are not.
Stick with the standard system would be my advice.