Big blow-off valve releases the pressure whenever Crockford lifts the throttle.
Heat is the bogeyman in all such installations. Compared to a typical under-hood compilation, the STS assembly places the turbochargers in ambient air at the rear of the car. The rear placement provides the lowest intake air temperature and (according to STS) reduces turbocharger temps by as much as 500 degrees. Temperature of the oil is also lower. Further, the scavenging effect that the turbos have on the combustion chambers will make for a more efficient running engine that will see a 1-3 mpg increase at steady-state. The added benefit is that the weight of the system is at the rear of the car instead of under the hood, thus helping weight transfer.
Alky Injection (Clearwater) alcohol can be delivered to the discharge tube in stages. It is plumbed via the stock windshield wiper fluid reservoir.
More germane to the discussion is how fast the compressor wheels spool up. First, let’s look at the intake air temperature (IAT). A low reading here equates to more horsepower per pound of boost than any other forced induction option. STS claims that the intake piping acts as a built-in intercooler. If you add the traditional (optional) intercooler as Bob has, IAT’s drop even further. Since the turbos are close to the tailpipe outlets, this enables a better pressure differential across the turbine compressor which promotes better flow across the turbine proper.
Alky Injection controller is located by Bob’s left knee. This application added 32 horsepower to the final RWHP number. As a cooling anti-detonation device, it allowed an increase in timing from 14 to 21 degrees.