600HP???????

guys I'm asking because we find out that there is problem with high egt in my car using the modified vtg turbines(997gt2 turbines with 48mm intake side), that means I have to high gas pressure before turbines.

We measured that my car have 585@4900rpm and than is to hot so there is more fuel to cool down, boost is reduced and the ignition is retard.

I would like to know how you solved the problem with cars over 600Hp and I'm very interested what is the situation with 700Hp vtg cars?????????????
I wonder how you reach 700Hp on 700kit without any major modifications?
I belive that you are using modified vtg turbines with the intake wheel no bigger than 50mm?
How you are able to reach 700hp with vtg turbines using standard cams, heads etc.
I can tell you that the 9ff 630PS never reached more than 596Ps at the dyno, you can see the list of mods bellow:
Performance Kit T-4
630 HP/ 463 KW, 790 Nm
consists of:

• [*]

My electronic guy tested 997 gt2 on the dyno for two days and there is exactly the same story, that means the 997 gt2 is at the maximum with the standard engine, all the temperatures are rising dramatically, air and exhaust.
The egt temperature is reaching 980 degree and than the boost reduced, it's getting very reach and ignition is retard.

Cheers,K

 

May cause they use race fuel

 

We never used race fuel, it is car for street use.
We have here in europe high octane fuel like 101+ from shell, and there was never problem like this before.
I drive my ex car on 1,7 bar and was no problem but with normal turbines....

 

this is why i bought Ruf! i mean you don't get any BS numbers/promises/excuses from them.
I have had same difficulties 18 months ago as the VTGs(incl GT2s) were too small, not getting enough "air" for 700(+) ps car level resulting in a fenomenal low rev performance but the engine "dies" over 3,000 rpm,in a nut shell this is the problem with the VTGs.
As a result i 've opted for the Rt12 and been laughing ever since

 

Have u raced that car in 1/4 or with other mod TTs ???

 

You have old 996 tt modified engine so no big deal, and you have ofcourse normal kkk 24/26 72. turbines.

 

did you read my post??
how can I race with problem like this?

 

I was asking HUGO

 

Protomotive/SPI used bigger than GT2 wheels on thier upgraded VTG's.

 

As probably any other tuners with mod VTG kits ??? )))

 

yes I have bigger, modified 48mm.

standard 997 tt is 44mm and standard 997 Gt2 46mm .

 

K,

don't you have the air/liquid intercoolers? If so I think that is your problem. The liquid can only hold so much heat before the system can no longer effectively cool the intake charge. The closed system of your liquid coolant cannot be replenished the way an air/air intercooler does. The heat will just then keep soaking into the system.

 

exactly my point,you STILL have (at the end of July 08) the problem i had 18 months ago....while i have 723 ps daily driver...
VTGs have(very) limited advantage,btw i get your 585@4900 from my ctr2 which is like 11 years old and very driveable,even my new ctr3 does not have VTGs and relies on "old" turbos.
I think that says it all,but then again - each to his own

 

Hugo both the AWE and EVOMS 700 cars were faster than both the 996Ruf RTurbo 590 and the RT12 at the Texas Mile. The Rturbo ran 181mph, RT12 ran 183mph with no headwind. The EVO and AWE cars ran 190mph and 186mph into a 15-20mph headwind. Temps were over 35C.

 

3-7 mph diff is a swing either way on different given days/tracks/drivers etc etc
I can show you repeated 0-300 km/h under 25 secs for the RT12 in European events/mag tests and far inferior results for the Rt12 in American mags....
I was refering to the VTG lack of size capacity and cosistency in output when compared with the "old" 996 type turbos for a day by day demanding use high output motor.
At the end of the day each to his own by way of preferences and build brief, if i wanted 900-1,000 ps monster for a few record setting runs belive me i know who to go to....