Cape ring. It's every possible corner put into one track. It doesn't make it a good track, but it's well suited for car testing.
I use tsukuba, doing so since FM2. Love that track, know it on the back of my hands and despite what most people will say, car that works on Tsukuba usually runs well everywhere. At least for me.
It's a rather short track too and it's easy to get constant lap on it for me.
I use Deep Forest and Suzuka to test cars too tho, depends what car. Deep Forest seems good to reveal MR or FR problem.
I like Trial Mountain or Deep Forest
I USED to love Midfield Raceway...
I use tsukuba, doing so since FM2. Love that track, know it on the back of my hands and despite what most people will say, car that works on Tsukuba usually runs well everywhere. At least for me.
It's a rather short track too and it's easy to get constant lap on it for me.
TGTT isnt that great because the only thing that track really tests is handling. Thats why a Caterham is faster around that track then a Veyron. I normally test cars at Laguna Seca.