Any one here done it? I'm planning to on my RB20 (well an RB, might get a 25) and I've seen more and more pop up over the last year.
http://www.yellowbullet.com/forum/showthread.php?t=216811&page=11
The post starter has a RWD 1g DSM that runs 8's/9's at "only" 600ishRWHP.
drops gasoline on the fire and runs away
~Alex
That makes my brain hurt.
I still don't understand why the smaller turbo wouldn't give up the ghost trying to spin unholy rpms...
But then again, i can't see a lot of the pics right now. I'll give it another shot when i get home.
I have thought about this, but never bothered to figure out the HOW. This does give me ideas...
Not sure if it helps- but there's a guy on the alfa board who is doing supercharger + turbo- http://www.alfabb.com/bb/forums/engine-conversions/78130-8v-2l-twin-charged-my-little-project.html
Good luck on it- I've seen a few proposals that seems pretty strong- possible to have both lots of low speed boost + lots and lots of high speed boost.
Have fun.
It was frequentlt done in large aviation engines. IIRC, the P-51 used compound super-turbocharging, amongst others
P-51 had a RR merlin with a 2 stage supercharger. The turbo compound aircraft engines linked the turbine to the crankshaft to recover power from the exhaust.
I still don't understand why the smaller turbo wouldn't give up the ghost trying to spin unholy rpms...
You can bypass flow around it with a wastegate.. it goes around the first turbine but is still before the second turbine.
I think.
Im considering trying to piece together something like this on a 4g63.. that i dont even have in my posession yet.
compounds are commonly done on diesels.. dig round those boards for ideas that will test your head bolts.
It is just a matching exercise to get it right.
I think that VW had some in the prototype stage several years ago. Wright 3350's are the only ones that I know of that were used commercially. The engine has a centrfugal supercharger for the induction. In the exhaust there is a power recovery turbine that has a shaft hooked to a gearbox that is connected to the crankshaft adding "free" horsepower. They are notorious for their unreliability.
HKS had twin charger kit for the MKI MR2 SC.
http://www.hksusa.com/FAQ/?id=1594&rsku=0
92CelicaHalfTrac wrote: That makes my brain hurt. I still don't understand why the smaller turbo wouldn't give up the ghost trying to spin unholy rpms...
Turbos run on pressure ratios, not absolute boost numbers. You would need to size it appropriately, of course.
The biggest "problem" is that compound turbos work best at absolutely ungodly boost levels. The diesel guys use them to get three digit PSI amounts. I wouldn't bother if I was "only" going after 30 psi or so.
The P-38 Lightning was the compounded one. Each nacelle held a 12-cylinder Allison with "turbosuperchargers". IIRC, it retained the supercharger as used on the P-51, but added a turbo as well and had some pretty complicated wastegating controls to bypass one or the other (or possibly both).
The P-38 would now be referred to as turbocharged. They did not have mechanical superchargers but a turbine driven supercharger hence turbo supercharger. The othe commom turbo supercharged WWII airplanes were the B-17,B-24 and P-47. GE made the turbos and due to limited manufacturing capability other aircraft had to rely on mechanical superchargers.
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