Staged Turbos (no, NOT sequential turbos)
#1
DEYTUKURJERBS
Thread Starter
Staged Turbos (no, NOT sequential turbos)
Anyone seen this setup before?! I hadnt until about 10mins ago, but meant to have been around for 30 odd years... 200psi boost anyone
Used on super-stock tractors for tractor pulling comps and stuff (banned in most turbo drag racing as its "cheating"), a turbo, blowing into a turbo, blowing into a turbo, and so on connected like in the pic, more turbos, the stupider amount of boost possible with decent efficiency and flow...
There meant to be plenty of books and info on it with all the formulas, and pressure and flow charts, etc.
I wont pretend i know any more about it as i dont yet, but bloody wanna find out, this mental
#3
DEYTUKURJERBS
Thread Starter
Its somthing to do with efficiency or flow or somthing, there IS a valid reason for it, what that reason is im not sure yet
They could use a single turbo thats capable of the same power, but they use 2-3-4 all connected to each other instead...
Soon as i can find out exactly the fuck why il tell you
They could use a single turbo thats capable of the same power, but they use 2-3-4 all connected to each other instead...
Soon as i can find out exactly the fuck why il tell you
Trending Topics
#18
#20
DEYTUKURJERBS
Thread Starter
compound charging is supercharger and turbo aint it mike, not what i put.
capri bloke- err, look at the pic you posted, its just twin turbo, nothing like what i posted
capri bloke- err, look at the pic you posted, its just twin turbo, nothing like what i posted
#23
DEYTUKURJERBS
Thread Starter
yea alright cleverclogs
is there anywhere that fully explains how it works tho?
i know it has to be a bigger turbo feeding a smaller one, and so on, but have no idea barring that
is there anywhere that fully explains how it works tho?
i know it has to be a bigger turbo feeding a smaller one, and so on, but have no idea barring that
#24
Regular Contributor
Join Date: May 2004
Location: Denmark
Posts: 266
Likes: 0
Received 0 Likes
on
0 Posts
http://www.vehicular.isy.liu.se/Publ...3443_OF_MG.pdf
IT's a 64 page scania study of compundturbocharging. BUT the secund turbine drives the crankshaft through an oil cupling of some kind.....
I too would like to read more about this compund charging?
Cheers Kennert
IT's a 64 page scania study of compundturbocharging. BUT the secund turbine drives the crankshaft through an oil cupling of some kind.....
I too would like to read more about this compund charging?
Cheers Kennert
#25
DEYTUKURJERBS
Thread Starter
from what i see written, say you wanted to run 3bar, both turbos only "sence" 1.5bar each, but it equals 3bar overall, which i doint get really
also says it had to be a bigger one blowing thru a smaller one, but no idea on size differences (dont look much in the pic i posted)
and how would it turn out, would you run a T34 blowing thru a T3 and itd have the combined lag of both, or what? (id guess not as the exhaust gas isnt split between them, the exhaust gas goes thru one then the other, maybe itl have the lag of only slightly more than the smallest one if it was on its own, fuck knows ).
did a goodle search and theres very little REAL tech info on it on the net , most of it is crap from people who dont really know, most of them mixing it up with sequential turbo setups.
from what i can see the reasoning for it is above about 40psi even the best turbo is no good, and turbos blowing thru turbos doubles it all up
says it makes charge temps huge tho, which is understandable, and surely power would still be limited by the flow of the smallest turbo exhaust housing! Tho i guess you could run a huge wastegate or 2 to bypass it.
also says it had to be a bigger one blowing thru a smaller one, but no idea on size differences (dont look much in the pic i posted)
and how would it turn out, would you run a T34 blowing thru a T3 and itd have the combined lag of both, or what? (id guess not as the exhaust gas isnt split between them, the exhaust gas goes thru one then the other, maybe itl have the lag of only slightly more than the smallest one if it was on its own, fuck knows ).
did a goodle search and theres very little REAL tech info on it on the net , most of it is crap from people who dont really know, most of them mixing it up with sequential turbo setups.
from what i can see the reasoning for it is above about 40psi even the best turbo is no good, and turbos blowing thru turbos doubles it all up
says it makes charge temps huge tho, which is understandable, and surely power would still be limited by the flow of the smallest turbo exhaust housing! Tho i guess you could run a huge wastegate or 2 to bypass it.
#26
Regular Contributor
Join Date: May 2004
Location: Denmark
Posts: 266
Likes: 0
Received 0 Likes
on
0 Posts
what I don't get is if the little turbo boost low down and the big takes over.....how will the big turbo boost more air when it's coupled with the small turbo that by nature can't deliver that much air ????????????
#28
Regular Contributor
Join Date: Jul 2003
Location: Hampshire
Posts: 311
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by kennert
what I don't get is if the little turbo boost low down and the big takes over.....how will the big turbo boost more air when it's coupled with the small turbo that by nature can't deliver that much air ????????????
Flow characteristics will change
#29
PassionFord Post Whore!!
Join Date: Jun 2003
Location: Holland
Posts: 7,442
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Itsmeagain
also says it had to be a bigger one blowing thru a smaller one, but no idea on size differences (dont look much in the pic i posted)
#30
DEYTUKURJERBS
Thread Starter
adus- dont worry, i wont, tho id love to know how this works. bearing in mind it seems to only be of use when running 40psi+ its only really good on diesels, where modded ones can run 150+psi boost
rene- i thought that but i think its the other turbo blowing thru the smaller one, the smaller one dont have to be at the same speed- look at a turbos housings, there a LOT of room between the wheels and the housings for airflow thats nowt to do with the wheels, they not a positive dispacment device
rene- i thought that but i think its the other turbo blowing thru the smaller one, the smaller one dont have to be at the same speed- look at a turbos housings, there a LOT of room between the wheels and the housings for airflow thats nowt to do with the wheels, they not a positive dispacment device
#31
I've found that life I needed.. It's HERE!!
Join Date: Oct 2003
Location: Coventry
Posts: 1,380
Likes: 0
Received 0 Likes
on
0 Posts
The best way to do it is smaller one blowing through bigger one until certain rpm where a valve opens to let more air into the bigger one. You get the ultimate power of the big one and the lag of the small one (but a "lump" on the changeover unless very carefully set and adjusted) With a small engined car (ie. less than about 4 litres) it's viable to replace the small one with a supercharger to minimise lag.
#32
DEYTUKURJERBS
Thread Starter
no, thats not the best way, its just a way, infact binning a sequential setup like you mention is one of the FIRST mods they do on RX7s and Supras that have that as std
the only way to run megaboost is this staged setup
the only way to run megaboost is this staged setup
#33
PassionFord Post Whore!!
Join Date: Jun 2003
Location: Holland
Posts: 7,442
Likes: 0
Received 0 Likes
on
0 Posts
Steve i can see you point on the housings being so far away but isnt there still a bit amount of air going from turbo to turbo ??
and what do i mean by "they not a positive dispacment device"
You are right on the binning the first 2 fookers on Supras and RX7's though
and what do i mean by "they not a positive dispacment device"
You are right on the binning the first 2 fookers on Supras and RX7's though
#36
DEYTUKURJERBS
Thread Starter
well they used on vehices running 200psi boost and over 3000bhp so i think they know more about it than we ALL do
unless you want to go disagree with them
unless you want to go disagree with them
#40
DEYTUKURJERBS
Thread Starter
no, sequential setups are different, and vary depending on the application, but NONE of them blow thru another turbo, they all blow into a common pipe after the turbos.
Thats the difference with this setup, its NOT made to decrease lag or whatever like sequential setups, this is to be able to do extreme boost levels that isnt possible with a single turbo.
Thats the difference with this setup, its NOT made to decrease lag or whatever like sequential setups, this is to be able to do extreme boost levels that isnt possible with a single turbo.