Will you not be reving it higher than 7K? The engine is fine to 7.5K or does the power tail off?
I'm still trying to work out if I should go .63 or .80 hotside. My engine will rev to 8250 though.
My redline is 7450rpm Alex. The turbo was only just getting into its stride by 6700rpm where we cut off. It was gaining 35-40bhp per 500rpm and was increasing in ramp rate when Steve Jr let off the pedal. On the road when revved out it certainly doesn't tail off even at the redline. On a road car AR63.
I want to see what yours makes to redline. Steve needs to keep his foot in.
Doing an HTA3071 on a K1 soon with a .63. Will see what that's like to drive in FWD to see if a .80 is better suited or not. I don't want to run out of puff at 7.5K with the way the engine is going to be built.