IPD has been testing and developing a new 82mm Competition version Plenum for modified 996 and 997.1 Carreras. The larger 82mm throttle body, from the 997 GT3, has a 22.8% increase in cross sectional area allowing for considerably more air flow into the Plenum and ultimately inside the combustion chambers for increased performance. IPD has a wide variety of "Competition" Plenums, all which utilize larger throttle bodies, but never one for the Carreras, until now. The bulk of power and torque gains come from the patented "Y" designed Plenum (with factory OE size TB) but Porsches with additional performance mods can realize even more power with the larger Plenum and TB.
Initial prototype Plenum tests have been conducted by Shahin Mobine of RennTrack.com on his highly modified 997 Carrera S. The 997 S started life as a street car, but has become an extension of Shahin's persona, and is now a dedicated track car focused on dominating the Owners Club Race Class in the POC. The RennTrack.com / HRG #393 is fully modified to Race Specs Race Series which requires all cars to compete at a GT3 Horsepower to Weight ratio to ensure tight competition and prevent skyrocketing costs.
The car finished 2nd place overall in the GT3 class driver championship after only competing in less than half of the season. The RennTrack.com / HRG #393 claimed 2 first places, 3 second places and 3 third place finishes. The car ran and finished ahead of many 996 and 997 factory-motorsport Porsche Cup Cars. The 997 S will be campaigned in the same series for 2012, seeking an overall GT3 championship.
Shahin said, "Since we race in a HP/Weight class, we are always looking for a way to develop the car further to make it faster. After looking at the car we decided we could improve the stock intake system to bring in more air to the engine at a faster and smoother rate. I put a call in to Greg at IPD and discussed a few options. After explaining to him more about our car and our plans we both decided to move forward with a brand new prototype Competition Plenum that IPD was developing for more modified cars like our race car."
"The car's engine is equipped with a custom 997 C2S race intake, Lucas Fabrication headers, Lucas Fabrication Cat-Bypass race exhaust, IPD 997 3.8 Competition Plenum, Porsche 997 GT3 Throttle Body and BMC replacement air filter."
Shahin continued to expand, "Together the new plenum and larger 997 GT3 throttle body would help our engine get a larger volume of cold air from our ram air decklid, allowing the engine to work even more efficiently and produce even more power. After Hergesheimer Motorsports installed the IPD plenum and 997 GT3 throttle body, the cars sounded instantly meaner! We all looked at each other and smiled. "She sounds like she is reving faster and the exhaust sounds deeper, you can even hear the air box more!"
"We loaded the car into the trailer and off to the track. After a few laps, the car just seemed more peppy, it would accelerate and pull more quickly, shifts points slightly changed and I found myself shifting sooner before hitting redline than previous times at the track. Overall I could not be happier with the results, the car sounds, and feels better and at the end of the weekend our lap times in the car were the fastest the car has run at Willow Springs. Big thanks to Greg and the whole IPD crew for letting us test the new 82mm prototype Plenum and for providing such a great product and even better service."
Click on the link below to view more details at RennTrack.com