Pound for pound....comparing a 2.3L twinscrew to a 2.3L TVS, what advantage is there in going with the t'screw? I can see where the 2.9L Whipple would have some advantages at higher boost levels.

 

none that I'm aware of

 

For several years, I read how "effecient" the twin screws were compared to the modern roots (TVS) blowers. Kept hearing it.......but never saw it. Still haven't seen it. The thing that did stick with me was what a well known shop that installs all types said. They don't care what you buy as long as you buy. No agenda. Their comment was that from a belt driven blower, a pound of boost was pretty much a pound of boost. TVS, centri, t'screw....."X" psi at 6000 rpm would have similar power from any of them. The boost delivery was different, but the hp per pound of boost was very similar. I do believe that was for more street type boost levels. Once you get way up there, the top mounts lack an effecient meth solution. That's where the centri's and turbo's shine. Meth easily injected post blower makes a world of difference.

 

I've read the same thing brother, over and over again. From the tests results I've seen (this was a few years back now) pound for pound what you say sounds pretty accurate. For the older modified roots design (60deg twisted rotors) the "street type boost" crossover point seemed to be right around 10lbs of boost. With the newer TVS rotors the island is so large on these things that they stay efficient over a rather broad operating range.......I guess I've kinda lost interest over the years in comparing all the nuances of the different forms of forced induction out there and generally tend to stay out of these kinds of discussions anymore, go figure. "But", with that said, there are some decent, although somewhat dated, arguments to the efficiency benefits of the twin screw design over the roots design.......I think TVS really raises the bar for what efficient "street type" boost is these days and it ends up being more of a supporting system issue rather than a blower design capability issue regardless of what system you choose.

thoughts?

 

yep....I think you put it into words better than I ever could. At mild boost levels, you can pretty much choose how you want your boost delivered and the top of the dyno charts will look amazingly similar. You still have blower X saying that it's infinitley better than blower Y, but I still take it all with a grain or two of salt. After going around the loop a time or two, I'm still more concerned with the company behind the product than the power claims.

All that being said....I do like and respect the guys that think outside the box a little

 

I dont wanna get into semanics here but,the statement "a pound of boost @6000 rpm is relatively the same between street blowers be it centuri,roots,screw."Is jus ignorent to all the characteristics that make a given blower better for specific application.You guys are smarter then that.There are isolated test performed on blower units so their capabilities are in black or white.Supporting hardware are at best details for the consumer to figure out.So next time you think debby downer about a specific headunit.Stop and use some common sense by understanding what the intended application really is.Good example is for the longest time most thought the 4.8 was jus a watered down 5.3 an should be ripped out asap.Jus like sidemount Whipples cant make much more power then n/a let alone good power for a blower lol.I used both together and made better power at boost levels lower then the competitions.I knew there was life outside the box but,to be honest I really had no choice other then go with a Whipple.I picked it up cheap off CL an made it work cause,all the numbers suggested the blower had potential.An Im no better then the next broke dick hard headed fool that enjoys goin fast....

 

Both Supersub and Trick have that worked out with spray bars in a spacer between the upper and lower manifolds.

 

I tried to follow that. Couldn't get it done. Maybe I'm a just a little too "ignorent"....The statement relating the various belt driven superchargers was made by Livernois Motorsports. Not me. They do know a little about that stuff. I tend to lean a little toward their side on this issue.

 

I've seen that. Some impressive engineering. It's a whole lot of cost and trouble compared to meth systems on a centri or turbo system. Whole lot more to keep up with too. Compare that to one or two nozzles installed in drilled and tapped holes in an intake tube. That's an easy one compared to installing a meth manifold under a top mount blower.

 

before/after nice hp gain across the board