i didnt know the stock bottom end can run to 10.5k safely?

 

Just because a turbo is large does not mean it will produce increased power above 9000k.

 

With the IP valvetrain setup, 2-step should not be a problem at all. You can't run 2-step on stock motors because of our springs.

 

Correct, people loose power after 9k rpms because the motor becomes inefficient for one reason or another.

 

we will see

 

What AR is the Turbine on your turbo? A higher AR will support the top end of the engine band but still will not be the factor that increases power above 9000 rpm. The biggest thing you need to look for is how the torque holds on. Do you have any head work done?

 

yeah my head is ported

 

Do you have flow bench data?

 

no i do not

 

Who did the port work for you? I am asking this because when designing the combustion chambers and runners you must keep in mind the power range you are going to use. You could add 50hp from 9000-10,000 but loose over 50hp in other areas. My goal is not to say you are not going to make power that high, its to understand the work done and give you info I have learn from people in air flow dynamics. Stewart Engines has my head at the moment, and all this was planned out before time. I will only be revving to 9K or so, because my port work was to increase mid end power while not loosing amounts of high end power. Given I am going to start out using a GT3076R with a .82 AR turbine , it should support the power goals that I have. Tuning the curve is what it is all about. I would rather have 50whp more from 6-8k than to have 20whp more from 8000-9000rpm. Also changing the Cam timing can shift the powerband up and down. I think you will find plenty of power by 9000 rpm