Found this online... Reportedly out of a SKYLINE...

what do you guys make of THIS?

 

hehe...let the roots boost the low end whilst the hairdryers come up to speed...

 

Yep... Supercharger gets rid of the turbo lag but i highly doubt worth the money

 

I guess its a roots blower with a reversed rotation so it can suck from the bottom, the pipe coming up from the left sucks air into the bottom and it gets forced into the top, then i guess the blow off valve hangs open to let the air out cause I dont think there is any kind of restriction on the blower, or maybe if its underneath... I am intrigued by this, I wonder what else you could do with..
NO! I will NOT succumb to the riggged up forced induction fantasies of the un-initiated!!!

 

The blower has a clutch on it!

 

Oh hey there goes my theory! now how can a clutch hold up to the 50-70 horsepower drain the engine sees, thats a huge amount of force on that clutch! I have heard horror stories... oh well. I wonder if its in the car yet?

 

I wonder if they make that kit for our cars!? j/k

 

That's a trick I've seen some MR-2 guys do. Remember the MR-2 when it was cool? I'm guessing around '92-'95. They had the same engine but they made a turbo and a roots blown version.

So some guys put BOTH on the same engine. I saw that once a couple years ago when I didn't know anything about boost. I wish I could see it again...

 

i was always wondering what a supercharged engine with turbos would look like.. now i know, that engine must be very built up...

 

I guess that would solve the "no-boost-at-the-line" stick/turbo problem.

 

I wonder if setting it up more sequentially would produce more boost.
Like pressure coming from the roots supercharger, into the turbos. Isn't the output pressure (from a turbo) an exponent of the input pressure (to the turbo)? If I'm right, a slight increase in pressure to the turbos would multiply into higher potential by allowing the turbine to spin faster. Isn't that why some twin turbo setups are sequential?

 

Well, youd think that having one turbo spool from the exhaust and blow into ANOTHER turbo to spool IT (instead of exhaust... it spools from the first turbo...) would allow the SECOND turbo to spool AMAZING SPEEDS!... However... There is a limit to how fast a turbo can be spun :-( and im sure that even though the spool time would be greatly reduced you would still have the same boost pressure maximum... because of the turbo's redline...
Now.. take a small turbo and have it spool a HUGE turbo...
technically it would eliminate turbo lag of the big turbo and force it to reach its redline super fast... you would think...

But I know next to nothing about turbos so its all just idle speculation from this point.

 

from what it looks like, it has a turbo per two cyl. with the screwcharger (not a roots) blowing into it. but i know one thing take the badges off and put it in a fiero or a mini and it get my vote

 

Since I really don't know any more then what is in the pics, I'm guessing somewhat, but I'm guessing that is built for a show car. It looks like there is way too much turbo on there to do anything and the way it's plumbed (unless there is something going on that I can't see) any boost made by the blower at low end will just blow out the turbos anyway (there is nothing to stop airflow from going backwards in a turbo that isn't spooled, for that matter if that air is being pushed with more force then what the turbo is pushing at), and you will never see more boost then whatever is comming out of the turbos at the time.

you can't make a turbo spin faster by blowing a nother turbo into it. You only have a total ammount of energy, and turbos are about 70% efficeint at best, so blowing through one turbo you'll loose at least 30% of the available energy.

what you can do is size the turbo to supply the air needed by the engine, and then blow into that turbo with a second, bigger turbo (this would actually become the first stage) sized for the 'bigger engine' made up of the engine and the first turbo (actually the second stage). This will allow you to build more boost. Some diesel rigs and tractor pullers do this and you can get up to about a 8:1 pressure ratio with this kind of setup (a single turbo tops out at about 3:1). Of course, I don't know of a gas engine that could run more then 45# boost (roughly 3:1 presure ratio)

 

Is that blower V-Belt? Thats the most retarded thing I have ever seen. Im getting dizzy trying to follow the incoming air path...

 

It's been done by rally teams in Europe...I want to say Audi had a good supercharger/turbo system going, but I could be wrong. Very effective if properly tuned. Definetly not a show car system, but rather a way to ensure pretty decent power at any RPM. Cool? Yes. Functional? Yes. Affordable? Absolutely not. Here's the nickle tour of how it works...Basically each component works until it's efficiency range is spent. Supercharger provides boost from idle to say 2500 rpm, small turbo (the one in the back) provides boost from 2500 to 5000, large turbo provides boost from 5000 to redline. I would say the turbo in the back is a T3 and the one in the front is a T4 or T6.

Later,

Matthew

 

there are setups that use a large turbo and a smaller supercharger to make up for it down low, but this isn't one. To start with like I've already mentioned, the plumbing... second, those compressors are both TO4(e's?) neither is a T03 or anything else. I suppose that they could be T4/T3 hybrids making the exhaust side possibly small enough to spool, but the compressors would still be past surge for most of the operating range of the engine anyway...

 

hey guys i just noticed if you took away the two turbos, and supercharger, its **** just remember it NEEDS those forced air induction systems to be fast

 

so ur sayin steve if someone takes a supercharger or turbo set up and puts it on a 305 or 350 doesnt matter and take it off there still slow. hey maybe the people that built that motor built the engine to the max and then added the other stuff to get more out of it.

its like one of us taking a 350 and stroking to to the max which i think the max u can get out of a 350 stroked is 396 or am i off by a little. but then someone addin a power adder weather its nitrous, turbo's or a supercharger and then be like yo man take that **** off and ur still slowjust becuz u have a power adder to help u.

hey i know as soon as i get the money im gettin a supercharged 355 and if it has the right intake bore on it im slappin my nitrous on it just for the track.

all i know is if u put that motor in the car it was designed for it will beat practicly everything on this board in almost every kinda race. becuz what it comes down to is if ya got the money do it if not hey put the money into something else

 

I don't get it hndsm17, and there's a problem with going fast with compressed air? What are you doing here?

 

lol 83 crossfire TA thats a funny avatar. i kinda like that lol

 

Thanks. I originally drew a big one like that for a T-shirt logo for a Junkyard Turbo group I spend too much time with...

 

i think the biggest u can get a 350 to with a 400 crank and 60 over is like 392 not 396 but then i could be wrong too

 

well if u take the 400 crank and tput it in the 350 it makes it a 383 right? and then say u take a 350 and bore it .020 over its a 355 right? well if u take that 350 and bore it .030 over it a 360 but then bore it .060 over it makes it a 370. im just guessin on all of this so dont get me wrong, but if u take the 383 stroker and bore it .060 over it will be a 406 is that right? anyone. im not sure but this is all being done in my head right now so i might be off. but if u bored the 350 .060 over the cyclender walls will be very thin? right

 

Just do the math. A 350 has a 4” bore and 3.48” stroke. A 400 crank has a 3.75” crank.
a .030” over 350 is a 355
a .060” over 350 is a 360
a .030” over 350 with a 400 crank is a 383
a .060” over 350 with a 400 crank is a 388

Most blocks are questionable over .040” over and need to be sonic checked to make sure that the there is enough metal left in the cylinder walls above that.

 

a .030 over 350 with a 400 crank = 383 cid, strangely a .060 over 400 with a 350 crank is a 383 also.

 

I've seen it done on a Talon once.

The way he worked it is that the supercharger would start off the line, then at a certain RPM it would turn off and the turbo-chargers would be spooled up.

The best of both worlds really.

 

GM's detroit desel engines like the 6-71 , 8-71 and blah blah blah 2 strokes used a supercharger with a turbo bolted on top. i worked on one in school and when i didnt tune it right, we couldn shut it down, it kept revving up, that was fun.

 

I'm guessing most of you guys are too young to remember this car, and its creator, Rick Dobbertin. He built this J2000 (!) with TWO superchargers and Two turbos!

http://www.auburnmoon.com/1985_pontiac_j-2000.htm

It was the pinnacle of the "Pro Fairground" cars, but you have to admire the workmanship if nothing else.

 

his and the older TA with the similar setup I remember them both (for all I know the T/A was his doing too)