Im going to be running Plex boost controller so im not sure if it will be an issue which spring I use.

The goal is maximum torque and maximum horse power.

Does anyone know how much bhp the xr770's flow on pump? Providing you aren't running out of fuel or air.

 

Since the wastegate is mechanical, it definitely still matters. You should be able to get an idea of boost target. If you aren't running race fuel, e85 or methanol, you're probably not going above 1.25bar. But on a built motor, maybe your goal is 1.5. I'm not familiar with a plex boost controller, but I'm pretty sure it just directs the control of the n75 valve. If you want your car to be driveable, start with the green spring, then increase if you can't get to your boost target. I think I swapped the springs in about an hour... with the turbos still mounted to my car.

 

What are the xr770’s like on the street ?Fun? I can’t wait to have them all dialled in

 

My car is an absolute **** show. Rwd and lots of torque. It's loud and fast, easy to get arrested in. I can't think of something better to drive. Enjoy