Everyone always wants to know what numbers did the car make or what 0-60 or 1/4 mile time did it run. There is so much that really goes on behind tests like this that all that really matters is the delta improvement. To compare to a magazine test or someone elses dyno is nearly impossible. First the magazine tests for 0-60 and 1/4 mile times do range quite a bit if you look at the different publications. But what makes these interesting is how strong the numbers are. This is because of several factors. First, most of these tests are running 93 octane fuel just like the fuel door says it should run. But if you are on the west coast, all we get is 91 octane. There is a substantial difference between the 2 octane points that can really make or break some of these numbers. When the do test 0-60mph times, they are on stock wheels, stock suspension, probably a guy who does not have his filmer in the car, and repeat the test on perfect pavement with properly set tire pressure. This also goes for the 1/4 mile testing. Unless you have rented out a drag track, getting this done on the streets is a tough feet to accomplish. Dyno tests, we wont even go there cause all that matters is your before and after as a collective test of parts or as individual tests. Not all dynos are the same even if it is the same dyno settings can change.
So our Porsche Turbo is equipped with 520 PS (382 kW; 513 bhp) and 620 N·m (457 lb·ft) of torque. Porsche rates the 0-60mph time at 3.4sec. Some magazines have gotten the Turbo S that has 40 more horsepower down to 2.6 seconds, though Porsche rates it at 3.1sec. So our numbers might be slow to the average internet user with these mods, but are they? With the VR Tuned Tuning Box Kit plugged in, our high flow headers, and titanium exhaust system, we dynoed the car at 494 to 499 awhp and 545 to 551 ft/lbs of torque. This gave us average gains of 60whp and 80ft/lbs of torque over stock. However our 991 Turbo was optioned with the factory Turbo S centerlock 20 inch wheels and sticky Pirelli tires. We upgraded to the Niche Wheels 2 piece 21″ setup which puts atleast another 5-7lbs of rotational weight at each corner. Rotational weight typically has a factor of 3. So this means we have added about 15-20lbs of weight per corner. With the larger diameter wheels, comes wider tires. The fronts stepped up to a 255/30/21 and the rears a 325/25/21. So now we also have more rolling diameter and pad on the ground. We have not shared this yet, but we also added some new Alcon 2piece floating rotors. The front rotors saved 1.2lbs but the rear rotors gained 0.6lbs. Again with a factor of 3, this puts the rear a bit heavier but the front helps balance a bit of the wheel weight add on. So not comparing apples to apples of a stock 991 Turbo chassis, what were our numbers?
We ran the car out in “Mexico” which had a bit of slippery pavement and rock pebbles from the cracked road. Trying the car with both 32psi in the rear and 40psi in the rear, we found the higher tire pressure worked much better for the street tires. Edmunds tested the car and did a 1/4 mile test on the 991 Turbo at 11.0 sec at 124mph. So with our extra rotational weight, 91 octane, and power mods, our 991 Turbo did:
- 0-60mph in 3.27secs in 153 feet
- 1/4 mile in 11.78 at 121mph
So the consensus here is that even though our 991 Turbo is making more power than a stock 2014 991 Turbo on a Dyno, to get proper and comparable 1/4 mile times and 0-60 times, we would need to revert back to stock wheels and tires and perform these tests on a race track with 93 octane and in controlled repeatable conditions. Here is the PBox times and a short video we put together.
