silverboy

Hi all,

Someone is selling me a Gruppe M intake. A search yielded no feedback. I noticed replacing the intake box assembly isn't a popular mod among P owners. Why? The Mk 2 RS seems to have a plus 15 BHP largely attributed to a better box.

Gruppe M link

http://gruppem.co.jp/news/newsen/item_102.html

Thanks again.

GT3

I don't know about that one.

Today I called , Porsche dealer to order the mk2 RS intake for my basalt black mk2 GT3. They quoted me $750 for it. I may look elsewhere for that piece of plastic Should be nice together with my Akrapovic race exhaust, which showed very nice gains on my car.

I'll be installing the mk2 RS intake box together with this, (the wing will be dry carbon):

silverboy

Hey that looks great. This plus the air box then you're good to go for plus 15 BHP! How much is the decklid/rear wing assembly if you don't mind me asking?

Would that look like poor taste if I put that on my RS.1?

Thanks!

Guest89

Wouldn't necessarily look tacky or in poor taste, but it just might not look good or flow well. Worth a try or at least a PS, though.

Carrera GT

I think the HP increase should be "largely attributed" to software and variable intake and exhaust valve gear.

silverboy

Thanks for your inputs Carrera GT. Regarding the variable intake, doesn't it only affect the low to mid range? At WOT, isn't it pretty much the same. Also, were changes made to the exhaust valve gear for the RS.2? I thought it was variable cam timing?

Best,

Carrera GT

Cam or valve gear. Same same. By having the two stage exhaust, they can build back-pressure for low rpm torque, but still open up an engine with a lot more advance and screaming power to the high 8000's without it being a pig below 5000. But I mean it's mostly in the software -- whatever the engineers are asked to deliver by product management, it's not an engineering limit, it's not based on quality assurance or warranty projections.

I am curious to know if the RS has any internal changes compared to the .2 GT3. They certainly did a lot on the outside. It amazes me that with each successive model Porsche builds an even more potent engine ... these used to be comparable to race engine outputs, now they're exceeding race engines and these are showroom cars with warranties.

P.J.S.

my tech just dyno'd the KN intake kit for the 997.1 RS which claims 26 hp gains... although my tech did not see 26, he did see a tic under 20 above 6500 rpm when comparing stock with sport button off vs KN with sport button on... on a dynojet sae corrected... car never left the dyno

stock airbox pulls
then install KN kit
KN pulls

on an 18000 mile 2007 997.1 RS (not mine)...

nice piece of kit and not expensive

Guest89

If it's a good mod why did you opt not to put it on your new RS? Just curious as to your reasoning.

Tacet-Conundrum

26 BHP at the crank or the wheels?

If it was at the crank then "a tick under 20" seems just about spot-on!

P.J.S.

parts are on the shelf and my tech is awaiting the arrival of my car - it is going on

you are probably right
k&n probably rates crank hp and my tech's results were to the wheels
reportedly it makes power everywhere but biggest gains are above 6500 rpm with sport on

silverboy

Thanks PJS996GT3. That looks like a cheap but effective mod. Hard to believe since the airbox seems so small vs stock. I guess since it's dyno proven it should be effective.

P.J.S.

I am fairly skeptical about k&n claims and I installed the 997.1rs k&n kit on my 996-3 and did not see nearly the gains...gains but single digit gains

so I was not in a hurry to get it going on my rs until my tech tested it in an actual rs and I was not buying another kit to test it given my 996-3 results...

so another local rs was the guinea pig and I was happy to hear that the k&n claims were not complete bs

as to the airbox being "smaller" I am sure it has to do more with cone filter and intake tube flowing more air faster... if that makes any sense.

GT3

I may have to try K&N in the future then. I installed the BMC filter on my MK2 GT3, and barely saw any gains. Couple of HP here and there....

silverboy

K&N is not just a drop in air filter but a box.

Since the gains are dyno proven it seems like a good idea.

Here's a video

http://www.knfilters.com/video/63-7001_install.html