In reality when tuned and adjusted properly the changeover was only a few hundred rpm. With a boost controller you'd be making 14psi from just above 2000rpm through to about 3600rpm, then by 4000rpm you'd have the second turbo going and be up to 18psi. The gap isn't a tuning issue although you can lessen it slightly, its simply due to you having a pressurised system from the first turbo then you suddenly open a flap which gives a large increase in volume that has to be re-pressurised as the second turbo comes in. Look at the chart, the power drops at 4100rpm and is back to the same power again by 4500rpm. Trouble is if you don't know the car and thats where lots of people tend to shift gears around, then you constantly fall into that gap, if you know the car and have it set up correctly its not bad at all. Trust me, i had a twin turbo Legacy GT for two years and know lots of others as well via the RS Liberty club. Can also tell you that my car saw off plenty of WRXs, RS's and many other cars over the time i had it as well and had zero trouble keeping up with modified WRXs and RS LIbertys on hipo cruises and such.... and this was auto.
are just conjecture. :thumbsup:
