The turbo kit simply makes more torque and horsepower at the same 7.5 psi of boost. Not having to manually spin a compressor wheel and instead using exhaust gases definitely has its benefits. Those benefits being less parasitic drag on the motor and more torque down low and through the entire engine curve.
Keep in mind these are 91 octane pump gas figures. Hitting over 600 wheel horsepower on 91 octane without meth injection on a supercharger kit just is not possible (despite a certain company making a claim early on that they did so at 7.5 psi through the stock exhaust system). As the dynograph obviously shows cracking 600 whp on 91 octane at 7.5 psi is something that the turbos can achieve on the S65 V8 and the supercharger can not:
From 3200 RPM to 4500 RPM – The Twin Turbo makes 60+ WHP more vs SC.
From 4500 RPM to 7000 RPM – The Twin Turbo makes 90+ WHP more vs SC.
From 7000 RPM to 8300 RPM – The Twin Turbo makes 50+ WHP more vs SC.
From 3700 RPM to 4600 RPM – The Twin Turbo makes 80+ WTQ more vs SC.
From 5500 RPM to 6200 RPM – The Twin Turbo makes 100+ WTQ more vs SC.
From 6200 RPM to 7200 RPM – The Twin Turbo makes 60+ WTQ more vs SC.
From 7200 RPM to Redline – The Twin Turbo makes 40+ WTQ more vs SC.
From 3,000 rpm until redline the turbos make more torque. As BimmerBoost stated in impressions of the turbo kit, there is much better response down low and the dyno graph confirms the large torque difference. For those of you who do not like the throttle response or torque of the supercharger low in the rev range, the turbo kit is for you.
The peak torque difference between the supercharger and turbos is 61 lb-ft of torque at the wheels. On 91 octane, at the same 7.5 psi of boost. That is a healthy difference and it also pays dividends in the peak power figure which shows the turbos with a 31 wheel horsepower advantage.
More power and more torque through the curve with better throttle response. The turbo era of S65 V8 tuning looks very bright at this early stage. The next step will be seeing how a built motor responds to the turbos and BimmerBoost.com gladly will voluneteer its own built motor M3 to find out. This is excellent work from Gintani who is now clearly separating themselves from the other tuners on the platform.
Twin turbo 7.5 psi STD correction:
Twin turbo 7.5 psi SAE correction: