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The impact absorbtion plate removal is a mod that many have made; yet there has mostly only been speculation about why the plate was there in the first place. Well, direct from PNA 489 821 06:
Left Air Inlet
The air inlets integrated in the rear side panels differ from those of the Boxster (987) in that they incorporate vertical vanes. The intake air for the engine is drawn in via the opening on the driver's side. The positioning and the opening cross-section of the air inlet have been carefully optimized to ensure the maximum possible increase in air flow rate combined with the minimum possible effects on lift and resistance. In addition, an effective labyrinth system which is isolated from the body has been located behind the left air inlet. The engine intake air is forced to flow around a deflecting distance plate, as a result of which water and particles are largely drawn off via the water drain at the bottom.
This air routing results in a marked improvement in the level of water seperation up-line of the air cleaner (when driving on surfaces which throw up a lot of spray), thereby protecting the hot-film air flow sensor from failures resulting from the intake of ultra-fine water droplets.
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Basically, if you don't drive through water, then you have nothing to worry about. If you do, then what's the cost of an hot-film air flow sensor failure repair, should you be unlucky?
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Cayman S - a portable amusement park To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
Thanks, that is very good information. Dyno tests have also showed a minimal (1 hp) increase. It is bogus in my mind but is one of those mods that make owners "feel" like they did something.
There is more than one mod that fits that description however. Over the years I have discovered that the modification result is mostly in the mind of the person doing the mod. But there is an entire industry making lots of bucks on that phenomenon. If there isn't more than a 20 hp increase it really is questionable.
So what's new? The purpose of the plate as a water separator was detailed in the Cayman S Product Information book printed in May 2005, distributed by Porsche to its dealers and also posted here 2 years ago when the Cayman S was first introduced.
It's been previously mentioned, along with objective dynos showing no meaningful power benefit from desnorking, but there are still posters who swear they can "feel" added HP with the plate removed. If so, I'll bet it's through their left ear from an increase in induction sound.
Regardless if it helps by 1 HP or 20 HP, the fact is a "labyrinth" design is not as efficient as a "straight to the intake in the most laminar, straight-path possible way" design...
Yeah I feel like we've beaten this topic to death. No one has done definitive research on power changes, only some dyno runs that show anyhere from 1 to 13hp gain. This is really an owner preference items. If you want to do it, then do it, if you don't, then don't. As a brief side note the last time I was on the dyno we did before and after runs with cleaning my K&N air filter out. It was very dirty and I was certain cleaning it would provide a bump up in HP but in fact there was no change at all. Does that mean we should recommend people run around with dirty air filter? No, it simply means we shouldn't jump on people who don't clean theirs every month (or pick your favorite interval) the same way we shouldn't jump on those who do or do not perform the desnork modification.
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K-Man S To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
Yeah I feel like we've beaten this topic to death. No one has done definitive research on power changes, only some dyno runs that show anyhere from 1 to 13hp gain. This is really an owner preference items. If you want to do it, then do it, if you don't, then don't. As a brief side note the last time I was on the dyno we did before and after runs with cleaning my K&N air filter out. It was very dirty and I was certain cleaning it would provide a bump up in HP but in fact there was no change at all. Does that mean we should recommend people run around with dirty air filter? No, it simply means we shouldn't jump on people who don't clean theirs every month (or pick your favorite interval) the same way we shouldn't jump on those who do or do not perform the desnork modification.
For me this has not been beaten to death. I am at the point where I am examining all sorts of upgrades/mods. I have reviewed a lot of info on the desnork topic but welcome any new insights (or older insights refreshed!).
I didnt take the post above to "jump" on those who do the desnork.
It seems in a car forum (as in others), some topics will come up again and as long as something new is in it, or it provides some discussion for those that might have missed it the first time around seems harmless. And the desnork topic hasnt come up much since I have joined. As long as it's not a flame war I think no harm is done.
OTOH, searching this forum seems much more difficult than other places. I have to spend an aweful long time trying to find what I want to find out. I do, but it aint easy.
Afridi,
I recently expanded the search capabilities here, what is it that you are having a problem finding???
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K-Man S To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
Beat to death topic, but still an interesting one.
At one time I was planning on doing the mod, but decided against it. If there was any guarantee I'd get 10HP or more out of it I'd think about it again, but until then I'd just assume leave it alone. I tend to love my cars totally stock and in perfect condition.
A "labyrinth" design not as good as a straight path?......I would disagree. The most important thing is to provide the most free flowing, non-turbulent path to the throttle body.....and that might not be a straight shot to the airfilter/TB when the car is in motion. Porsche does a lot of work (as do other manufactures) in this area to get it just right. It is well known in the 928 community (of which I own an example of) that leaving off the air filter lid and associated piping actually results in a slight HP loss. With the lid off it may be the "straightest" route for the air to enter the engine, but not the most beneficial. The intake piping actually smooths out the airflow to the filter, maximizing air input.
I would agree that Porsche was mostly worried about water and dirt entering the engine by fitting the plate, but I tend to trust their engineering when it comes to these things. I don't think they would put it on a car if they knew it would take away 13HP.....they would re-design the whole thing at that point IMO. The plate on the Cayman may take away 1-2 HP, but I don't care at that point and will leave it in place.
No, it simply means we shouldn't jump on people who don't clean theirs every month (or pick your favorite interval) the same way we shouldn't jump on those who do or do not perform the desnork modification.
