irun a d1-sc in a sbc and making 640hp 512 to the wheel 15psi boost

 

I could be wrong but aren't the top fuel dragsters that kind of blower with
8,000 hp or am I mistaken.

 

You are correct, they use 8-71 roots blowers....technology from the 1960s

 

That's what I was thinking but break down there engine. Simple but brutal 8,000HP Top Fuel Engine - Car Craft Magazine All Pages

 

Why did New Era Performance switch to turbo ? I think that's who it was In the badass GMC

 

They definitely don't use 8-71s. They are much bigger than that. I believe they run 14-71s if I remember correctly.

 

Yea youre right, they are 14-71s

 

I will let you know once I get mine back together. I am expecting ~750 with the new setup. It won't be quite maxed out on the blower side, so there will still be a little room to grow by pulleying down. Numbers are not dyno confirmed but based off time and weight I calculated ~630 from my best time with the previous setup. Kenne Bell claims to have several 800+ cars with the 3.6LC. However, if I ever decide to go over the limits of the 2.8L KB, I will likely go Procharger due to the reasons Atomic mentioned earlier. It is tough to plant that much torque off idle. Adding in a hard hitting converter makes matters even worse. I like the idea of boost ramping up a little slower with the centrifugal. I love the instant torque of a twin-screw but I can see why more people don't use them for extremely high hp builds. Above 6-700hp, the low end torque is just too violent and hard to manage for most street car.

 

Fixed that for ya

 

so why cant they make them more efficient? I say let them make all the power they can.