John@Fabspeed

Fixinbones

Thats just mean!! Where r the numbers?

Chris@Fabspeed

So far we've tested 2 of our exhaust configurations. The first was our HJS 200 cell Sportcats. We didn't expect huge gains from just the cats alone, but what we did expect was delivered - quicker spooling of the turbochargers. The factory cats, while having a high cell count, work extremely well. However, Turbo cars just love it when you get rid of some backpressure. They respond by spooling faster, which translates to torque & horsepower graphs with even greater areas under the curves.

Just bolting on a set of 200 Cell HJS Sportcats gives you a slight increase in exhaust volume (the increase in sound over stock is comparable to what you gain when pushing the Sport Plus button). It will also give you your peak torque approximately 200 rpm sooner. For example, if you floored the throttle at 1600rpm, by 2100rpm, you have 100 ft. lbs of torque more. Peak power was up 5whp and peak torque was up 13 ft. lbs to the wheels.

Chris@Fabspeed

The second configuration we tested was our 70mm Supersport X-Pipe, with the 200 Cell Sportcats. This setup sounds GREAT. Awesome burbles on downshifts. And it performs much better than the factory setup. At 2102rpm, we are seeing an extra 3.74 psi of boost over stock. If you look closely at the boost curve (below the horsepower/torque graph) you can see the steeper slope of the blue line. This translated to an extra 138 ft. lbs. of torque to the wheels at 2102rpm, because the turbo's could spool that much quicker. Peak horsepower was up 15whp, and peak torque 36 ft. lbs to the wheels. Exhaust backpressure was reduced by approximately 1.5 psi with the removal of the factory rear muffler, and the addition of our 70mm Supersport X-Pipe.

RINGMEISTER27

WOW.

John@Fabspeed

I didn't keep you waiting for nothing!! The car hasn't left the dyno yet

Ray S

Great thread!!

ajag

Better than expected, I can't wait!

John@Fabspeed

608 ft.lbs!!!! This car will be an absolute BEAST

FastLaneTurbo

Very Interesting Data - Thanks for Posting. I would really like to see what a Stock Turbo S would Dyno at. Hopefully one of our members would loan you a TTS to test.
My understanding is that the hardware is exactly the same on both Engines with only a Software Boost increase separating the 520 HP of the TT from the 560 HP of the TTS.
Further narrowing the performance of both engines, the Turbo has a wider HP and Torque Range when compared with the Turbo S. Comparing Porsche’s Specifications:


** * * * * * * * * * * * * * * * * * * * * * * * 991 Turbo* * * * * * * * * * * * * * * * * * * 991 Turbo S* * * *
Max HP * * * * * * * * * * * * * * * * * * 520 HP @* * * * * * * * * * * * * * * * * * * 560 HP
RPM Range for Max HP * * * * * 6,000 - 6,500* RPM* * * * * * * * * * * * 6,500 - 6,750* RPM
Max HP Range Width * * * * * * * * 500 RPM * * * * * * * * * * * * * * * * * * * 250 RPM
Max Torque* * * * * * * * * * * * * * * * 487 Lb Ft* * * * * * * * * * * * * * * * * * * 516* Lb Ft
Max Torque Range * * * * * * * * * 1,950 - 5,000 RPM* * * * * * * * * * * * 2,100 - 4,250 RPM
Range Width * * * * * * * * * * * * * * * 3,050 RPM* * * * * * * * * * * * * * * * * * 2,150 RPM* *
Compression Ratio * * * * * * * * * * * 9.8 : 1 * * * * * * * * * * * * * * * * * * * * * 9.8 : 1

Max Torque with Overboost * * * * 524 Lb Ft * * * * * * * * * * * * * * * * * * * 553 Lb Ft* * * *
Max OB Torque Range* * * * * * * * 2,100 - 4,250* RPM* * * * * * * * * * * * 2,200 - 4,000* RPM
OB Torque Range Width* * * * * * * 2,150 RPM 1,800 RPM

Please note that although the Turbo S makes 7.7% more HP and 6% more Torque than the Turbo, the Turbo recaptures much of that advantage by making its max HP 8% earlier than the TTS and holding it over a* 100% wider RPM range. Similarly, the Turbo makes its Spec Torque 8% earlier than the TTS and holds it over a* 42% wider Torque Range. Both models increase their Torque by 8% in the overboost range, but again the Turbo's Overboost Torque starts earlier than the TTS and stays later widening the TTS OB Torque range by 19.4%.*

On public roads, the small performance increase at Higher RPM of the Turbo S is unlikely to be noticed by the huge*majority of owners in a lifetime of driving. On most U.S. Tracks, I believe laptimes of both models are likely to be within a few tenths* of seconds.
You would really be helping Rennlist members trying to decide between the TT and TTS
by providing actual Dyno Data. Many Thanks again for your very informative posts.

MMH78

I would also like to see the difference between TT and TTS. Will definitely help in choosing between the two.

TB993tt

The Turbo S has some different hardware to support the higher rev limit including different conrods.

FastLaneTurbo

Originally Posted by FastLaneTurbo View Post
My understanding is that the hardware is exactly the same on both Engines with only a Software Boost increase separating the 520 HP of the TT from the 560 HP of the TTS.
.
TB993tt: "The Turbo S has some different hardware to support the higher rev limit including different con rods."

Hi TB993tt, Can you tell us how you know that? And where we can we confirm that? Thank you.
__________________

TB993tt

The power of Google never ceases to amaze ! I knew we talked about this on a Rennteam thread so googled "991 turbo s conrods" and it took me straight to the page on a 127 page thread

Here is the link for the S engine info:

http://fortyonesix.com/news/1320/por...ers-turbo-s-fo

RINGMEISTER27

Rennlist investigators, ftw!