Anyone ever do it?

I have an ATI overdrive balancer, 8 rib kit, and a 3.0 upper pulley on there right now. I only see 12 lbs.

I have a 2.75 pulley on the table but this will pass the max blower speed of 18000 RPM. (8.29" / 2.75 = 3.01. 3.01 x 6000RPM = 18060 blower rpm.

I want to spin the engine to at least 6500 but that will over drive the blower to 19565 rpm.

Thoughts anyone?

 

I have not overspun a roots blower, yet, but I will likely overspin mine once I get the new setup up and running and pulley down to get back to 15psi. At a proposed 6800 shift point, I will likely only be at 18,700 so only overspining by 3.7%. I know the Cobra and Lightning guys overspin them all the time. I personally wouldn't be worried till over 20K rpm. Manufacturers ratings are always on the safe side. You could likely go 20% over the rating and never have a failure because of it. However, trying to warranty it if it does fail will surely be a failure.

 

Is it intercooled?

 

Thanks for the info.

 

Yes, it is intercooled. Top mount kit

 

I'd do it.

 

Just looking for someone who has actually done it and has some type of report.

Any ideas on what additional power I would see? Probably see an extra 2-3 lbs of boost in my 6.0. Just a guess though based on the last pulley drop I did.