air filter size effect on power
For turbos with 4" inlets, has anyone done any dyno testing of no cone filter vs a filter? Or ow about a smallish filter (b/c of fitment issues) versus larger ones in applications with more space? I'm talking about filters placed directly on the turbo inlet or with a short inlet duct, no "cold air" setups.
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I did a test last year on my brothers car with the GT35 and it made no difference.
I was shocked as i was expecting 5~10hp.. We were using a k/n air filter... |
Originally Posted by arghx
(Post 8811814)
For turbos with 4" inlets, has anyone done any dyno testing of no cone filter vs a filter? Or ow about a smallish filter (b/c of fitment issues) versus larger ones in applications with more space? I'm talking about filters placed directly on the turbo inlet or with a short inlet duct, no "cold air" setups.
This was with a T04S, .84 A/R P Trim on a Renesis. I'd like to specify that the filter I use is tiny(about 3-4" long) due to space constraints. Chris |
My K&N was small too but no bend just straight off the turbo.. We did one run and immediately did another with the filter off back to back and netted no difference at all. no changes were made. Im sure the quality and size of the filter makes a difference the k&N's must flow good.
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A small filter will not significantly affect power unless it is so small that it becomes a restriction. If a filter is not a restriction to flow, increasing the size to a larger filter will have zero effect on power, but it will not get dirty as fast as the smaller filter.
As for any horsepower gain, it is a percentage and not a fixed number. For example, were I a slick businessman trying to sell my filters, I would test one on a 3,000hp engine and advertise that my filters can gain up to 40 hp! Of course, it would only add about 2 hp to an otherwise stock 13B, but I did advertise "up to" 40 hp. ;) Also, turbocharged engines see more of a gain with high-flow filters because turbos multiply pressure. For K&N brand filters, I derived the stupid Evil Aviator K&N filter rule of thumb, which hopefully isn't any more stupid than the other stupid internet guidelines: Horsepower Potential = Filter Media Area square inches * 4.53 If in doubt, just go to the next larger filter size as it will not hurt anything. If you have limited space, then just get the filter with the most filtration area possible. |
I remember reading a thread a long time ago..
ReTed had a 20B they were tuning by removing the filter the A/F ratio went leaner by a whole point! so I guess it depends on the application and filter itself as well I ran no filters on my stock twins the other day.. I swear it sounded like a T51-R! so mean! |
nice to see you still on here aviator
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I know this is an old thread, but I finally got around to doing this...
I am surprised this little air filter isn't making a greater impact on power, hell the air filter makes more power at lower rpms.. |
Originally Posted by 1Revvin7
(Post 9811566)
I know this is an old thread, but I finally got around to doing this...
I am surprised this little air filter isn't making a greater impact on power, hell the air filter makes more power at lower rpms.. |
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