Since when can any turbo build off idle boost faster than a mechanically driven roots blower? Not gonna happen, not ever. Remember folks, I said build boost faster, not build more boost.

 

You summed it up prety well I think.

 

Well, since it's nearly impossible to brake stall and build boost with a roots (I never could) and turbos already have 5-10psi of boost built before launch, maybe we are talking apples and oranges.

 

i'd like to see two similar trucks with stock converters. one being a radix truck with just the parts from the kit and one being an sts equipped truck with no intercooler and no meth kit.

 

Yeah, the roots just moves air from one side of the blower to the other causing compression to happen in the engine.

Twin screws compress the air as it travels down the screws, then puts it into the engine. Thats why twin screws are more efficient.

I was just saying they're both positive displacement blowers. Boost should rise quickly and remain close to the same throughout the rpm range. I have heard that it takes a twin screw blower 1000 or so more rpm to get to full boost than a roots.

 

I think ability to launch in boost on any of these types of forced induction has to do with your setup. Mostly your converter.

Stock converter-- Radix and twin screw should have full boost by right around or shortly after stall speed. Turbo might be able to build 1-2 psi by brake stalling but take untill 3000rpm to reach full boost. Centrifugal would have about 0-1 psi at stall and full boost at redline.

With the turbo, a 3000 stall would probably allow you to hit full boost right after you punch it. You'd also be able to build a little more boost at the line because of the stall letting the engine spin faster without creeping forward.

With my 3800 stall setup, I launch at about 7-8 psi. My converter flashes to about 4300rpm. When I had my 3000 stall, I launched at about 2-3 psi.

It's hard to say one forced induction setup is better at launching than the other, because they can all be pretty much equaled out with the right converter.

 

Have there been any ideas on relocation of the turbo on the STS kit. If I had the STS I would always be stressing in the rain and around water! The other thing is like Flyer said how hard is it for someone to slide under your truck and unbolt your turbo? Not everyone has a Garage and for someone who had to save for a year or two to get the STS thats gonna be on their mind. If I got it Id have to have add some more sensors under the truck to the Viper. Then again with some good thought Im sure some type of security can be made! Id be lookig under my truck everytime I went to drive regardless!

 

Agreed.

 

Well, if you 'relocated' the turbo on the STS kit, I don't think it would be an STS kit anymore. Part of what makes it unique is its rear mounting. There are a couple of manufacturers of under-the-hood turbos if you want to go that way, Combination Motorsports in Vegas being one, though I'm not sure they're completely done with their kit yet.

 

They don't produce/sell that kit anymore, at least to the public. I went down there to check it out and was told it was Seth's project and has since left. So no turbo kit from them.