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Old 06-12-2012, 07:42 AM   #21
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I also removed the snorkel and put a piece of bent aluminum in the bumper gap to push down the rubber flap that is attached to the radiator shroud. Others have cut the rubber completely. This gives the OEM inlet a ram-ish set up.

Some day I would like to fab an actual piece out of fiberglass to create an actual ram air.
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Old 06-12-2012, 08:20 AM   #22
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Originally Posted by dyn085 View Post
I also removed the snorkel and put a piece of bent aluminum in the bumper gap to push down the rubber flap that is attached to the radiator shroud. Others have cut the rubber completely. This gives the OEM inlet a ram-ish set up.

Some day I would like to fab an actual piece out of fiberglass to create an actual ram air.
Why not add one of these?


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Old 06-12-2012, 08:21 AM   #23
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Do we have a consensus as to whether there are any significant negative effects to swapping to one of these intakes in terms of engine life? I would expect the less restrictive filter to let more crap into the engine (but you'd see this even if you just put a K&N into the stock air box, too). My concern is heightened further because this engine is direct-injected.

If this is really a safe mod, $250 for 10 whp is a damn no-brainer IMHO.
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Old 06-12-2012, 08:37 AM   #24
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This car and the mods are to new to know what the long term effects are.
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Old 06-12-2012, 08:41 AM   #25
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Quote:
Originally Posted by Pretherius View Post
Do we have a consensus as to whether there are any significant negative effects to swapping to one of these intakes in terms of engine life? I would expect the less restrictive filter to let more crap into the engine (but you'd see this even if you just put a K&N into the stock air box, too). My concern is heightened further because this engine is direct-injected.
If it's any consolation, I've used K&N cotton gauze filters or intake/filter combinations with the last 4 cars I've owned and racked up more than 150K miles on each of them. When I sold them, they were still in perfect running condition, were oil-tight (didn't burn significant oil) and didn't show signs of wear otherwise.

I have seen statements that a cotton gauze filter can increase engine wear due to contaminants by up to 10% over paper. This may or may not be true, and I think the actual estimate would vary greatly depending on the running environment of the engine. In other words, if I were driving in dry, dusty conditions a majority of the time, I might consider sticking with paper media. Otherwise, I have seen no reason for alarm.

I'm not sure why you would have heightened concern with a DI engine. Even if "crap" were to make it into your engine, it would be dry "crap" (not sticky like blow-by/PCV gases) and fly right past your valves and not stick to them. In other words, your DI engine should react to this "crap" in the same way a port-injected engine would, and show wear mostly on piston rings and cylinder walls.
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Old 06-12-2012, 08:48 AM   #26
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I doubt you'll see any engine problems with an intake. The only thing that would be bad is if you are using a dirty filter or if you drive through a really big puddle and flood the intake area.
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Old 06-12-2012, 08:55 AM   #27
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Quote:
Originally Posted by Pretherius View Post
I would expect the less restrictive filter to let more crap into the engine
Here is a well-designed (IMO) filtration test of various media: http://www.bobistheoilguy.com/airfilter/airtest3.htm

Filtration and flow are inversely proportional. You must be the judge as to whether the increase in flow is worth the decrease in filtration in your environment.
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Old 06-12-2012, 08:58 AM   #28
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Quote:
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The only thing that would be bad is if you are using a dirty filter
Cotton gauze filter manufacturers (e.g. K&N) state that a filter of this type filters better as it gets dirty, but flow will be reduced. This is why their maintenance schedule is as high as 100K mile intervals. I don't see how reduced flow and increased filtering would be detrimental to the engine.
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Old 06-12-2012, 09:15 AM   #29
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Originally Posted by TboneZX3 View Post
I'm not sure why you would have heightened concern with a DI engine. Even if "crap" were to make it into your engine, it would be dry "crap" (not sticky like blow-by/PCV gases) and fly right past your valves and not stick to them. In other words, your DI engine should react to this "crap" in the same way a port-injected engine would, and show wear mostly on piston rings and cylinder walls.
My reason--which admittedly could be unfounded--is that we don't have gas washing over the intake to clean stuff off. Some of the extra stuff that gets into the engine may not be inherently sticky but there is always humidity, and some of that stuff does get stuck to water into the air and then will be sucked into the intake... throttle, MAF, ports, intake valves. All I can do is speculate either way, sadly.

Quote:
Originally Posted by TboneZX3 View Post
Here is a well-designed (IMO) filtration test of various media: http://www.bobistheoilguy.com/airfilter/airtest3.htm

Filtration and flow are inversely proportional. You must be the judge as to whether the increase in flow is worth the decrease in filtration in your environment.
Yep, that's exactly the article I had in mind.

I'd be really interested to know then what we'd get out of tossing a K&N into the stock airbox. If it's worth 2 HP then meh, but if it's good for 6 or 7, that would be enough to make me happy.
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Old 06-12-2012, 09:21 AM   #30
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Quote:
Originally Posted by Pretherius View Post
My reason--which admittedly could be unfounded--is that we don't have gas washing over the intake to clean stuff off. Some of the extra stuff that gets into the engine may not be inherently sticky but there is always humidity, and some of that stuff does get stuck to water into the air and then will be sucked into the intake... throttle, MAF, ports, intake valves. All I can do is speculate either way, sadly.
Throttle and MAF should be a moot point when comparing the two, as they would work the same in a DI or port-injected engine. You might have a point about humidity and the ports intake valves, but I would certainly be more concerned about blowby/PCV gasses building up there than any miniscule dust that is making its way past the filter. Speculation though, as you mentioned...
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