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Can you share the details of the fuel system upgraded needed for Stage 1.5?
So based on our experience with Lexus DI cars that are designed from the factory to be normally aspirated, we have found that adding port injection helps to improve top end power through better air/fuel mixing. In this particular case we use a separate computer to control port injector fuel flow, and additionally we use that computer to control boost pressure during shifts to optimize shifting.
Rafi
__________________ RR-Racing Motorsports Engineering We Engineer Track Proven Upgrades For Your Porsche! SUPERCHARGERS : ECU TUNING : SUSPENSION : EXHAUST
So based on our experience with Lexus DI cars that are designed from the factory to be normally aspirated, we have found that adding port injection helps to improve top end power through better air/fuel mixing. In this particular case we use a separate computer to control port injector fuel flow, and additionally we use that computer to control boost pressure during shifts to optimize shifting.
No, not enough fueling for that. I know that many high power 911 turbos are running e85, but I’m a bit hesitant going there for reliability reasons as alcohol based fuels can wash the cylinders, and given that these cars don’t have iron sleeves they are more susceptible to cylinder wear due to oiling issues.
We recently took our Supercharged 991 (and Supercharged ISF) to Cecil County Dragway to make some test passes.
Keep in mind, the 991 is not set up for drag racing but nonetheless, we are happy with the outcome and excited to get back and see if we can dip into the 10's!
We recently took our Supercharged 991 (and Supercharged ISF) to Cecil County Dragway to make some test passes.
Keep in mind, the 991 is not set up for drag racing but nonetheless, we are happy with the outcome and excited to get back and see if we can dip into the 10's!
Besides gutting the car to make it lighter, what could be done to lose that last 10th to get into 10's?
We think all it needs is a PDK tune. We are unable to use launch control, as the car is too powerful to launch at the OEM launch control RPM. I believe the ideal launch control set point for this power level is about 4500-5000rpm. Cooler temps will also improve times another 0.1sec. Lastly street tires would help a bit (like P4s vs Cup2s).
Here is an interesting comparison between our Supercharged C2S and a 991.1 GT3 with full catless long tube race headers, & exhaust/tune. Same exact dyno
If you think about it, you're not driving at WOT all the time. Even partial throttle and normal driving you'll be lucky to see any boost at all, maybe one or two PSI. So, in the end, it's not putting as much stress on the drivetrain as you'd think.
Ha, speak for yourself. Maybe not ALL the time but WOT happens often enough Have the same concerns as I hear mixed things about aftermarket supercharging and reliability. Also how does this change aftermarket exhaust sound and overall volume/decibel levels? Not a fan of noise and love the stock sound of my none sport exhaust.
Hello there friend LOL, maybe down the line when I do go with 200 cell cat's/headers while I still reside in Cali.
But in all seriousness, this does have me seriously considering this maybe next year, would love to wait and see for more longevity and reliability tests... OEM 991.1 replacement engines ain't cheap.
Ha, speak for yourself. Maybe not ALL the time but WOT happens often enough Have the same concerns as I hear mixed things about aftermarket supercharging and reliability. Also how does this change aftermarket exhaust sound and overall volume/decibel levels? Not a fan of noise and love the stock sound of my none sport exhaust.
The sound of the exhaust is just like NA sound, so depends on your preference of exhaust. The only additional sound you hear is the whine from the supercharger (primarily at idle speeds) and the popping of our huge Turbosmart Power Port Blow off Valve.
as for reliability.... our car was purchased with 53,000 miles. It now has 12,000 miles supercharged. That includes 350 dyno pulls to redline, 5 track days, and lots and lots of very intensive street testing. If this kit is installed on a primarily street driven 911, there is nothing you can do on the street that will begin to match what we’ve thrown at our shop C2S.
What you are seeing with the new turbo cars is tuners posting higher and higher dyno numbers, with dubious testing. We pushed the limits on our C2S for 10,000 miles before we sold a single kit.
I just did three awesome days of driving my RR Racing supercharged 991.1 4S during the Rennsport Dragon Rally in east Tennessee and western NC. The roads were magnificent and the driving was so much fun, much more fun with the extra power of the supercharger. I could not have hung with some of the turbo cars, like the 991.2 GTSs, without the SC (Stage 1). And it was kind of fun having a sleeper car. After some spirited runs some of the other drivers were surprised that I could stay with them. On the downside, I'll be needing new tires sooner than expected.
05-26-2020, 01:09 PM
Have the same concerns as I hear mixed things about aftermarket supercharging and reliability. Also how does this change aftermarket exhaust sound and overall volume/decibel levels? Not a fan of noise and love the stock sound of my none sport exhaust.
