It's there

 

Here is a race from a recent airstrip event, No Fly Zone in Bakersfield, CA. This race is against a Mustang GT500 with a 4.2L Kenne Bell supercharger upgrade. The driver claimed that the car was making 750 wheel horsepower.

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Some more 68mm VTG footage! This race is against yumaverick's 800 wheel horsepower beast!

 

Tom@Champion, any further development on the 68mm turbos on a PDK 997.2? Or PDK upgrades?

 

Interesting in the relation "times vs power",
2 years ago when I was still running my FVD's 66mm VTGs with a Protomotive tune and a 2,5' exhaust my very best time was 6,21' at the 60-130, average 6,75'.
My best dyno at this point was 670 Crankhp/905CrankNm on a Superflow 4x4 dyno, which nearly equals this car's Wheel power and torque, meaning at least +15% at the crank if I'm right.
How can we have so much different difference with equal times?

(PS:my 6,21' is registered in the 996TT's times thread)

 

There are many factors that come into play, such as the density altitude, slope, horsepower, etc. This vehicle attends nearly every airstrip racing event and beats many higher power cars with claimed lower 60-130 times. The thing about the 60-130's is that they can vary dramatically based on the conditions.

The only times run on this car were in what could be considered poor conditions. On the track, it was beating cars that claim to normally run high 5's 60-130, so I would say that given what the conditions were at the track, this car could go a lot faster. Most customers just prefer to see how their car runs in all conditions, rather than just ideal ones.

 

I would love to see some quarter mile slips with these 68mm turbos on a 997.2

 

Coming soon, we're setting a car up now

 

Pascal the reason for this is that everything is bigger in Amerika.

In Excellence #215 (Dec 2013) was a story about 991 turbo's introduction. The author, Ian Kuah, was interviewing August Achleitner about 991 turbo's technical stuff.
AA: " We used a slightly smaller impeller to reduce inertia and improve spin-up time. The turbine housing is unchanged, so we retained the ultimate power ceiling with these particular turbo units, which is close to 600 hp."
"Although the new exhaust pipes are not actually longer than before, the slightly greater space available between the motor and chassis enabled us to optimize the curvature of the pipes for better gas flow, and the lower backpressure gained through this releases extra power and torque."

So here head of 991 product line states that VTG power output is turbine housing limited around 600 hp. So far there has been no signs that there's different turbine housings in any 997/991 turbos. Neither has any tuning company released such part. Taking into consideration the fact that the factory has to keep certain safety margin (say 20%?), then the turbine side should be maxed out around 720 crankhp. How on earth there's tuning companies that claim 800+ whp??! (with 20% loss about 960 crank...) Of course no-one has released any backpressure figures.

 

I would question the validity of this article on this point by itself. There is NO difference between the 991 and 997.2 exhausts except for the outlets to the tips. Even the catalytic converters are the exact same part number.

Trust me...the power output of the turbine housing is not maxxed out at 720 crank hp. That information may be true if you leave the compressor wheel and housing untouched. But as soon as you change the compressor, you can definitely make more HP. Tuners have been putting out more power then that for years, even in Europe.

 

Well, for another update here is a race against a Mercedes E63S with a Weistec turbocharger upgrade (claimed 700 wheel horsepower). I think it's safe to say this Porsche is making over 720 at the crank .

 

A rematch with yumaverick at the last Shift S3ctor event. There was a little confusion on the starting point, hence the jump at the beginning. Note the final trap speeds. These are among the fastest stock-internal Turbos we've seen come out.

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Which trap is yours the 167 or 169?












What did Longboarder trap, as he was moving out for as well, especially for a stock turbo?!

 

Champion car = 169.68
Switzer car = 166.91

I believe longboarder was trapping in the 163-164 range, but he would need to confirm.

 

The reason my trap was lower is because I short shifted 5th and 6th gear to decrease stress on the engine. I did the same thing against longboarder. He even noticed why he picked up speed when I was going from 5th to 6th. No way would he have trapped higher if I didn't do that. I was trapping 8mph higher at willow and did a 174 at shift sector earlier in the day. Great race though.