Originally Posted by
Rob_DOHC
Are you talking about swapping between a high and low boost target map or actually swapping between two fuel/ign maps?
I often use more than one map to increase resolution in areas like idle and cruise. For example, I might swap maps at 10psi from one 16x16 table to another 16x16 table which means one table has 256 cells devoted purely to power runs and another has 256 cells used mostly for cruise and low load stuff. I also do the same with ignition maps for idle if a car has a silly cam.
We also use multiple maps for things like track/road. The only difference here is that lean cruise is ignored and idle is a little richer as well as high load to keep temps down a little.
Or if your talking about why have multiple boost target maps???? Well I guess you trust your missus to drive your car as is
..... other than that I don't think it would ever be touched.
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?
Originally Posted by
Rob_DOHC
More or less, the 20psi target would probably mean you made 10psi a little sooner as the waste gate would be fully closed. If you target is 10psi the waste gate will begin to open before 10psi to avoid overshoot.
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.