I was looking at the Radix kit and come to the solution that it will be the one I will buy when I get the cash. I like the turbos but it seems complex, when you have to buy intercoolers, meth injection, fuel pumps and upgrade turbos to get 13psi. The Radix is more of a complete kit that seems more user friendly if you want to make more power. However, I am going to install a cam and I was wondering if it would be compatable with the Radix kit 214/220 .600/.539 114.5 lobe. If it is what is the most reliable and safe amount of boost you can get from the Radix kit. I was hoping to get 9-10psi maybe 11, but what I really want to do is achieve 450-480 rwhp out of a 5.3! Is it possible?

 

Yes, the Radix can support a cam in a 5.3. It is the larger displacement motors that it cannot feed. The thing you will have to watch out for if you decide to go to a smaller pully is over spinning the blower. With a larger cam you are probablly going to need to shift it out at a higher rpm which may take the rotor rpm over recomended limits with a smaller pully. The cam you mentioned would do OK but it dose not have true blower specs. Although it is a split pattern on a wider lsa, it has a decreased exhaust lift.

 

Yes, the RADIX can support a cam. It does so quit well I might add. It depends on how fast you spin the motor on how much boost it can take as that's directly related to what size pulley you can run.

 

FLYER, Do you have any vids of your truck in action. I have seen the STS truck videos and they seem like they are preatty fast of the line. But I have read that the Raidx kit is a lilttle faster off line and might (not trying to start a long thread) have the advantage, and from what I see in the Fastest truck list, your truck can hold its own. I would like to see some vids of your truck in action to see what the radix kit can produce. Also how much horsepower are you putting out?

 

I'm guessing on my quickest run (12.59) somewhere between 400 - 425. I have some videos of my last times at the track, but they aren't the best times since it was hot and hummid. The track prep was not that good either.

www.woracing.com/truck/videos

These are also after the 80e trans went in, it's HEAVY and takes a bit more power to turn. I think I also need a better converter.

There's also a dire need for tuning.

 

what do you consider over spinning a radix?

 

As with any blower motor, you want high lift,, short duration, a wide LSA, and a favored exhaust side. Overlap siphons off boost. Believe it or not, the best cam choices for a street-legal blower motor will probably idle quite smoothly.

 

the real question is can it support 500 rwhp?

 

Here are some various sound clips of my cam idling:

http://www.woracing.com/truck/Sound%.../53%20216-220/

216/220 .525/.532 114

I'm not 100% sure about the lift, but it's close.

James B is right though, a tame cam actually works best with boost. If I were to do it again, there would be a 218/224 on a 114 center.

 

My 400-425 guestimate was on the 'stock' pulley. I think it can, it would be close, but I think it's possible.