987 v 986 Air box

[onaFLYer]

Originally Posted by Marchie

Thanks for the reply Brad, Am still a little confused . We cover that hole, Why ? And what happens with the large cutout we have just made.
I'm definitely no mechanic, just trying to learn how things work so if they make sense to me I can then make a decision to try them or not.
Thanks for the help so far.

The hole is open to the engine compartment after removing the back side of the assembly, past the air filter. So you want to cover it so nothing gets sucked directly into the air stream and MAF w/o being filtered first. I have the same looking patch on mine.

If you look at the pic's I posted, the 2nd one shows the portion that was cut off, right behind the tube that comes out from the assembly past the main housing. Hope this helps.

[Marchie]

So what's the next step in the process . You cover the hole, then ? What happens with the large cutout section, please, Thanks

[Brad Roberts]

I throw the large cutout section in the trash It's a box. The hole being covered is one way in one way out. Cover it, and no air will bypass the filter. We are cutting off a sound chamber/muffler. It is not needed.

I wish I had shot a picture of the air box prior to cutting... I may pull the one out of a CaymanS in the shop right now for an engine rebuild just so you can see the before and after.

Guy's.. buy a new one from Porsche. Trying to find them used right now is going to be difficult.

I posted the part number and the price in a previous post. They are not expensive new.


B

[The Radium King]

got a question - why are we modifying oem air boxes instead of going to say a bmc carbon dynamic or direct air unit? is it to stay within scca regs?

[Brad Roberts]

Porsche has more engineers than both those companies combined X5


The BMC stuff is a compromise, just like the Chinese headers. They make one size to fit all and typically.. it is too small.

You know:

The stock CaymanS box supports 300hp stock. I have personally dyno'd and tuned this box to 420hp in X51 Cayman's.


We have made our own tubes/air boxes.. too much work.. I can buy this from Porsche and with 15min worth of mods to the box, it bolts in.


I have used the other stuff. The best one I have seen on the dyno is no longer available and was nearly 4x times the price of buying a stock CaymanS air box from Porsche (new)


B

[jaykay]

Plus water ingestion and FOD problems would be better dealt with. I believe there many models that use this airbox starting with the 550 spyder 986......going all the way up to the present day Cayman S....not sure about the base Cayman and the R.

I started to modify my stock s box but have stopped.

[jaykay]

Sounds like you are just lopping off a resonance chamber for sound attenuation and are left with the entrance hole to the chamber from the primary airway.....and have to block it up. This move may reduce turbulence

Originally Posted by Brad Roberts

I throw the large cutout section in the trash It's a box. The hole being covered is one way in one way out. Cover it, and no air will bypass the filter. We are cutting off a sound chamber/muffler. It is not needed.

I wish I had shot a picture of the air box prior to cutting... I may pull the one out of a CaymanS in the shop right now for an engine rebuild just so you can see the before and after.

Guy's.. buy a new one from Porsche. Trying to find them used right now is going to be difficult.

I posted the part number and the price in a previous post. They are not expensive new.


B

[SoloPierre]

Hey Brad,

I believe the '04 550 Anniversary used the same intake (part # 987.110.021.00). The extra bump in hp was partially attributed to the intake. Do you have any idea how they got it to fit in the '04 Anniversary without cutting the airbox?

Pierre

p.s. If anybody is looking for a Cayman airbox, DCauto has a used one for $200. For $367, you can get a new one from Sonnen Porsche in the bay area.

[Brad Roberts]

Hey!! I know you

Interesting... very interesting

It shows that Porsche used a 993 MAF holder in the 04/986 chassis compared to a 987.606.125.00 for the CaymanS


Looked at the Yellow GT3.. spotless.. easy minor damage no tweaking



B

[Brad Roberts]

Do you have any idea how they got it to fit in the '04 Anniversary without cutting the airbox?

The Cayman tub is shaped slightly different right where the crossover rail meets the frame rails at the back of the engine compartment.

It is more flat along this wall (see arrow below)

[SoloPierre]

Thanks for the pics. I can see how the 987 airbox would have a problem fitting. I wonder what they did to get it to fit the '04 550. If I see a 550 at one our PCA events, I will ask the owner to see if I take a peek under the engine cover.

Originally Posted by Brad Roberts

Looked at the Yellow GT3.. spotless.. easy minor damage no tweaking

I put my hunt for 6GT3 on hold. My wife now wants a Mini Cooper instead of a GT3 :-( Go figure...

Pierre