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The 991 911 Turbo makes 520hp and 660Nm as a 991.1 and 540hp and 660Nm as a 991.2, from the 3.8 litre twin-turbo flat-six. Our Stage 1 calibration takes the 991.1 to around 585hp and 750Nm and the 991.2 to around 650hp and 820Nm. The car featured here also ran BMC filters and a full IPE exhaust with sports cats, and the development showed how much intake air temperature governs what the engine will give; the tune is written to protect against heat rather than chase a peak. Every 911 Turbo is run on our 4WD linked dyno so front and rear wheel speeds match and the torque vectoring stays happy.
The Porsche 991 generation of the 911 first came into production in 2011 and till current. The Porsche 911 Turbo is well known to be an amazing car on the road and track, with the ability to change the power, suspension stiffness, and steering input this really does make it feel like you have numerous cars in the same shell.
With the 991 911 Turbo making 520-540ps dependant on if you have a 991.1 or 991.2 that is already a substantial amount of power… So lets see what else that 3.8 24v engine has to offer.
Starting with reading the Continental SDI9 ECU to get all the manufacturers calibrations, and data logging certain parameters whilst stock to see how the ECU calculates certain parameters. From here we started to make a few small adjustments to make sure everything would react how we wanted it to.
The slight difference with this 991 Porsche 911 Turbo would be the BMC Performance Filters and the Full IPE Exhaust System with 200cell sport cats.
After a couple of initial re-calibtraions of the engine software it soon became apparent that the IAT (Intake Air Temperatures) would become a problem and this meant if you wanted to push any more power then uprated intercoolers would be required.
With these cars having Torque vectoring also it means it is a must for a 4WD linked dyno to make sure the wheel speed is the same front to rear. If this isn’t the case the car notices and drops into a limp mode style map, this doesn’t bring engine lights on just restricted power.
With Stock runs underway we found that even stock the car must be struggling with heat! Making only 470BHP but an astonishing 799.2Nm of Torque which suggested it could make the low down power but struggled top end. With Intercoolers being a very expensive upgrade on these we kept with the
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Photos from the build
5 photos of this Porsche 911 in our Maidstone workshop. Tap any to enlarge.
Questions we get asked
Why does a 911 Turbo need a four-wheel-drive dyno?
The 991 Turbo monitors wheel speed front to rear for its torque vectoring. On a two-wheel-drive dyno the mismatch puts the car into a reduced-power mode with no warning light, so the figures are meaningless. A linked 4WD dyno keeps all four wheels at the same speed.
Do I need uprated intercoolers?
Not for Stage 1. Intake temperatures are the limiting factor on this engine, so if you want to go past Stage 1, or use the car on track, larger intercoolers are the first hardware upgrade worth making.
Is the Turbo S tuned the same way?
Yes. The Turbo S uses the same engine with a higher factory output and reaches slightly higher tuned figures. Ask us for the numbers for your exact model year.
