mhd212

Hi guys,
As you can see, i have many questions
I just wana know after how many kilos will the car gives its best performance and boost presure? my car has 2000 km and the boost is around 1.2 bar.

Any useful information you got for me?

Thanks,

Marc Gelefsky

Hi MHD, There is a forum specific to 997GT2's, You should post your questions there.

LINK

TB993tt

The boost will vary according to atmospheric conditions specifically air mass, this is what the ECU is measuring and it will constantly adjust the boost level up the rev band to hit the target air mass numbers which are pre programmed into the tables.
On a cold day expect less boost and a warm day higher boost levels.
At DIN measurement Porsche say that the GT2 runs 1.4bar boost from the turbo but due to the GT2s exclusive expansion manifold the actual boost which enters the combustion chambers will be slightly less....

More pics of your car would be great it looks an unusual colour.....

Keep the questions coming, lets talk GT2s

pmf

Measured on a sunny morning, outside temperature around 18C, the diagnostic computer gave a max overboost reading at 1.58 bar

Mine is an RSTuning Stage 2

Ciao

TB993tt

pmf, may I ask what diagnostic computer you are using, I am after something to read IAT and other stuff but can't find any commercially available kit for '09 models ?
BTW 1.58bar

pmf

Ah, the reason why I did measure it with the diag pc is of course because I didn't trust RSTuning claims of 1.6 bar overboost for their 600hp package

I thought they were boosting more, to achieve that incredible torque, so I tested. I have to admit that I was positively impressed to see a max just below 1.6 during many runs we did

I am always curious to know well what I paid for

Ciaociao

pmf

Hi Toby,

I just plugged the Porsche diagnostic pc, which is reading real time data from the ECU. So you need someone on the passenger seat with a good reading ability and no seasickness...

Paolo

TB993tt

Paolo
Are these available to buy anywhere ? or was this borrowed from your dealer ?

pmf

I actually was with my Porsche workshop manager. Luckily enough, they follow Motorsport, so they understand and tolerate my requests. I do not think these tools are available to the clients, I'll ask next time. Or I will try to overwhel him with my requests, so he will be happy to gift me one if I go on my own

MJones

The new 911 GT2 turbocharger has a larger
compressor and a turbine optimized for
flow.
The enlarged compressor ensures
that the maximum boost pressure for the
new 911 GT2 is approximately 20 PSI.
This is an increase of approximately
6 PSI on the standard boost pressure of
the 911 Turbo (14.5 PSI), and an
increase of 3 PSI on the overboost
optionally available for the 911 Turbo
(max. boost pressure: 17.4 PSI). The
turbine housing has been modified to
improve flow, and its flow resistance is
lower than that of the 911 Turbo.

pmf

Well said, MJones
I was shifting focus too quickly to upgrades
The factory standard max boost for the GT2 is indeed 1.4 bar
What is interesting to note is that with the VTG the bypass function is actually managed by the ECU, so there is no more the mechanical boost limit settled by the external wastegate
Cheers,

mhd212

mmm, interesting.
My car did around 1.2 on hot tempreture.
so guys, i was told that the cars performance will be better after 3000 km
have you noticed a change in performance?

mhd212

I will post more pictures very soon, thanks TB993TT