EVO Highflow intake. 8-10hp anybody have one?

[xclusivecar]

Many people have been concerned with water entering their intake track when they de-snorkel their car. After seeing the stock airbox you will realize this is almost impossible. With this kit it looks as though the filter is completely open to the elements...hence the great intake sound. Are you concerned of water from washing the car or a driving rain soaking the filter and causing problems?

[986Jim]

No not really. In the shop I work at part time (performance shop mainly for Honda Acura) many cars show up with AEM cold air intakes on them (Type-R, Civic SIR etc) and they are totally open to the elements right in the front bumper. As in rain and road splashing are hitting right on the filter and they don't have a problem.

There are such things as water injection kits that are used for tuning (a band aid job if you ask me) that injects mists of water into the intake tract to lower the air temp which helps avoid knock on high hp cars. Your engine can take in a pretty large sum of water. Only that this sum can not be more than the sum of your head CC and CC of the dish on the pistons as water does not compress.

The average head hat 70-90cc of volume and with say 10:1 pistons you will add another 40cc from the bottom end. So in theory you could suck up 130cc of water (which is a lot) before running into problems. The amount you would suck from a wet cone filter with a pretty large surface area is pretty small and nothing to worry about.

Even with the filter half submerged in water I doubt you would pick up that much. The engine probablly pulls in 250cfm of air, the filter is capable of 800cfm or more, so the filter could be half covered and still feed the engine. If the car was fully submerged it would be a problem for sure, however you would have other problems such as that big ass tornado about to suck you up...

[JP-s-in st. louis]

The Evo intake as one of my first mods., I think it does add power 10Rwhp probably not. I like the sound and, my dyno results showed an increase with it and the Cargraphic muffler. If you ask PorscheDoc you may get a group buy going on.

[MNBoxster]

Originally Posted by 986Jim

No not really. In the shop I work at part time (performance shop mainly for Honda Acura) many cars show up with AEM cold air intakes on them (Type-R, Civic SIR etc) and they are totally open to the elements right in the front bumper. As in rain and road splashing are hitting right on the filter and they don't have a problem.

There are such things as water injection kits that are used for tuning (a band aid job if you ask me) that injects mists of water into the intake tract to lower the air temp which helps avoid knock on high hp cars. Your engine can take in a pretty large sum of water. Only that this sum can not be more than the sum of your head CC and CC of the dish on the pistons as water does not compress.

The average head hat 70-90cc of volume and with say 10:1 pistons you will add another 40cc from the bottom end. So in theory you could suck up 130cc of water (which is a lot) before running into problems. The amount you would suck from a wet cone filter with a pretty large surface area is pretty small and nothing to worry about.

Even with the filter half submerged in water I doubt you would pick up that much. The engine probablly pulls in 250cfm of air, the filter is capable of 800cfm or more, so the filter could be half covered and still feed the engine. If the car was fully submerged it would be a problem for sure, however you would have other problems such as that big ass tornado about to suck you up...

Hi,

Normally I would basically agree with you, but not in this case. The Boxster does have a history of water entering the intake and fouling the Motor.

So much so that Porsche even put out a TSB on it - TSB 7a/97 2425 - Water in Air Cleaner Housing.

In it they state:"Condition: Engine misfires during driving, rough running, poor starting.

Water can enter the air cleaner housing via the air guide when
the vehicle is driven in unfavorable weather conditions, e.g. during
rainstorms.

This can cause engine misfires and rough running and possible water-locking of the engine.

These problems do not necessarily occur during these weather conditions; they could show up later on. Please ask the customer if the vehicle was driven in these weather conditions.

They also include a MOD to the existing AirBox which includes:

• 1. A gasket between the outer left air guide and the body
  seals out water.
  2. A deflector is fitted on the air cleaner intake opening, and a water separator bowl is fitted on the air cleaner housing.
  3. The formerly used water shield support in the flow duct has been omitted.

They price this using 130 TU (Time Units - minutes) for the MOD. The interesting thing is that by de-snorkeling you would actually decrease the possibility of this happening because there is no direct path for the water to follow to the Air Filter and beyond... Hope this helps...

Happy Motoring!... Jim'99

[986Jim]

It would have to seriously injest a lot of water for something to happen tho. Doens't really matter much to me either way I dont drive my car in the rain anyway, I have the Jetta for that.

Besides a TSB is when it happens to a very limited number of cars and they either don't know the problem, or are guessing what it is. The chances still remain that nothing will ever happen regardless. Your intake system sucks up water and water vapor everytime you drive in the rain. Most intake systems draw from behind the headlight of a FWD Front engine car, they are just as prone to suck up water, but it just doens't seem to happen or matter.

The chances of that happening with an open air filter that has 360* to draw from would be minimized in my opinion vs. a flat panel filter with less surface area. Either way I just don't see it happening or causing a problem even if it does.

http://www.sportcompactcarweb.com/tech/0104scc_aem_air_bypass_valve/

Here is an interesting article where AEM ran an NSX on the dyno with the filter submerged and only using their air bypass valve. If your so worried about water it really is the answer. Even after lifting the filter out of the water, air bypassed the water through the main filter and never reached the engine. Of course the intake is not how it would normally be, but you can see that even with 250whp it can't draw air up a foot of pipe into the engine, and it's right there.