you cant compare a twinscrew or even a roots-hybrid blower to a centrifugal blower, 2 COMPLETELY different power curves

 

Well then I think that's the best way to answer his question

From what I've read, it looks like major torque by as low as 2000-2500 rpms. VERY flat torque line, which you usually don't see in centrifugal blowers.

 

I know on the Lightnings the KB would out perform the lightning SC just because it had less parasitic loss. So even if you ran them at the same boost level the KB would make more power. That being said, you can turn the boost up much higher and still be more efficient than when you turned up the boost too much on the Lightning SC.

So you figure the Lightning SC is pretty much the Radix, so the KB should perform the same on the GM like it did on the Lightning.

Just my 2 cents.

 

When people compare the KB to the Radix why doesn't anyone look at size? Yes you can pull test after test up about the KB and it's better. But the displacement is not even relative! That's like saying the average 185 lb. weight room junky is going to get smoked by some 225 lb. power lifter. What do you think is going to happen? One is just phisically bigger and therefore should be able to do more. The day that someone tests a roots vs. screw, newest technology, same displacement you'll see the truth. "Pound for pound" I don't think the TVS can be touched.
However I do believe that the KB package, for the price is just as good, even if it's bigger. I'm a fan of both.
Just don't go off and rant that one out performs another and therefor it's better. Especially when it's not apples to apples.

 

Its more than just parasitic loss. Its also that twinscrew is FAR more efficient than roots, produces less heat than roots so you are able to run more timing, and it can actually rev out unlike a roots where (depending on the boost level) wont be efficient past 5500 rpms on fairly low boost. Other than price there is nothing about twinscrew that isn't better than roots.

(Roots low low end will probably be slightly better than twinscrew below appr. 2500 rpms, but all that just depends.)

BTW this is not talking about TVS superchargers as I don't have any real world comparison with them.

 

I also have no experience with the TVS SC, so all my input was from the older style SC.

I understand it is bigger, but if that is what you have to compare to, then you are still comparing what you have for a roots blower, compared to what you would have if you bought a KB.

I was comparing the Lightning SC to the KB because those were 2 options you could buy at the time I owned the truck. Just trying to give my 2 cents. Sorry if I was wrong.

 

I don't think anyone was wrong. The KB is a great compressor, just not the same size as the smaller stock radix that's all.

 

The Kenne Bell Intercooled looks and sounds nice but they dont make one for my truck, 2005 6.0 LQ9 VHO, just got off the phone with them. They told me the same thing they have been saying for years now, just a couple months, they just never say which months.

 

BTW, what is TVS?

 

https://www.performancetrucks.net/fo...d.php?t=390128

that one wont work for the 6.0