Originally Posted by
fiend
I am talking about multiple boost target maps. I assume thats how most fast road cossies and rs turbos are mappped when they have a high/low boost?
I see. So if all you have is a switchable boost target map it essentialy does the samething you could be doing with the accelerator?
I am just trying to understand the real world benefits of say a 10psi and 20psi boost target map.
People say for traction in the wet etc, but could you just not press the accelerator any further once you reach 10psi on the 20psi map? The 10psi map would just mean you can hold 10psi at 100% throttle to the limiter instead of 20psi. But why would you be driving that hard to hold 10psi to the limiter in wet conditions?
Any help is appreciated. Trying to understand as much as I can.
Most old school switchable boost systems just fall back to waste gate spring pressure. Which is normally 7psi for the majority of rs turbos with standard actuators.
In the wet less torque may mean higher acceleration as the acceleration will be determined by traction. Most normal people would just lift off the throttle.... I genuinely only ever use a switchable boost map when someone else is driving the car ie, my mrs.
My old (and never driven
) Rs turbo switches between 7psi, 18psi and 24psi. I always drive it on the 18psi map as it drives well at 18psi and is kind of tractable. It was mapped at 24psi but is a torque steering mess at 24psi and useless with anything other than good tyres and sunshine. 7psi is just there in case I can't drive it home for what ever reason, the car starts up on the 7psi setting and the switch to change is hidden under the dash.