Turbo vs. Supercharger.

[scirocco81 at vwmail.net (Eric S)]

Great, so every time I change altitude I have to change the drive pully on the super?  No thanks, thats stupid...rather have something that compensates on its own!

As for wastegate control, yes, I am familiar with turbo design.  Now Larry, have you seen the latest VNT turbos?  No wastegate...quite interesting design actually...all the TDI engines in the Beetles and Golf/Jettas after 99.5 use a VNT-15 turbo, which is called a "variable vane" turbo....I'm not completely sure exactly how it works, but from what I have been told there is a nozzle of sorts that is constantly varying how much exhaust flows into the turbo.

Well, I'll tell you, turbo lag on these really dosen't exist...the VNT-15 on the TDI engine is at full boost by the time you hit 1700 rpm or so...basically almost right off idle.

Here, I found a link, this guy describes it as actually the vanes themselves being adjustable....I'd still like to find a really nice technical design drawing of one of these...but this guys description helps...and he too explains that the turbo has almost no lag...

http://www.houlster.com/amigo/turbo2/

So, Larry, till I see some sort of "infinately variable, automatic transmission" for a Supercharger to spin it at different rates depending on conditions....I'll stick to turbos...especially those VNT types...quite a good little design.  

--
Eric
www.VintageWatercooleds.com

79 VW Iltis
81 Scirocco S (*TDI* swap and complete restoration in holding pattern)
81 Rabbit Truck LX Diesel (FOR SALE!)
81 Rabbit Truck 2.0 16v Motronic
83 Scirocco Wolfsburg
91 Cabriolet (2.0 Crossflow 8v swap and mechanical rebuild in progress)


--- message from "L F" <rocco16v@netzero.net> attached: