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Official PSE on a 996 GT3...


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Hi Guys,

Appreciate there are a number of threads relating to a swapping the exhausts on the 6GT3, but can't remember seeing answers to the following questions, any ideas?

I once fitted a PSE to my old C2, along with the switch to activate the vacuum reservoir. The feed for the accumulator was taken taken from a "T" junction (or spare branch) from the intake plenum bellows. The accumulator then mounts off to the RH side of the engine bay, install the electrics and hey-presto.

On the GT3, of course its a different intake setup.

Q1 - Does anyone know where a vacuum feed can be taken from? I'm presuming the electrics would all install as before, but what were bellows on the C2, are simply straight coupling hoses on the GT3. I'm not into dropping the engine to get to anything, BTW!...Alternatively any other way of actuating the valves?

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I know the official line from Porsche is that fitting a PSE nets no additional bhp. The C2 certainly picked up quicker, but this was only ever a subjective assesment on my behalf.

Whilst I'm not busting to get another few bhp, what I certainly don't want is to lose anything (either low down torque or top end hp).

Q2 - Does anyone have any experience in dyno testing before and after with a PSE?

Reason for wanting a PSE is purely for the switchable noise - live in a sleepy little picture postcard town and frequently do early starts/late returns, so can do without the coffin-dodgers getting Plod on by back!

If this can't be done, then I may as well just bite the bullet and go for a Cargraphics setup, add 7hp and save a few £££'s (although I really want the Export version, the next one down seems to be what the UK importers, Parr, say is equivalent to the noise of a PSE...which I always loved)

Any advice or experience greatly appreciated. I've been naffing around on this subject for far too long.

Cheers

Spencer

PS...apologies, but also posted this on RennList and 911uk, just to canvass as many opinions as poss...

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Hi Spencer..... As far as I know, the factory 996 PSE is specific to the 'flat bottom' engine, not the Metzger/GT3 engine. I do know that US after market suppliers will sell you the same exhaust for both motors....so, the PSE will probably fit. You would have to analyze and find your own sources of vaccuum, etc. But, who knows what the PSE will do to the GT3 exhaust tuning (and can prove it with real dyno numbers). I've lusted after the Cargraphic exhausts myself. At least they are made specifically for the GT3 AFAIK. Given that, I would opt for the Cargraphic product. Let us know what you decide.

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Hi Craig,

Thanks for your comments - between here, RennList and 911uk.com, there's some good feedback. Seems as though there's a vacuum take-off thats possible from over on the LHS of the engine bay to feed an accumulator, and one of the chaps who has a (well and truly Manthey'd) Mk1 GT3 also used to use the PSE, and has posted dyno printouts showing no loss of hp, so all goodness there....however, there are also comments saying the CG Export zorst is also totally livable...going to flip a coin soon!

Cheers

S

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