Twin-charging
#21
1) Some people were talking about the air going through the supercharger, through the turbocharger, and into the engine. This would produce a very large amount of boost with high variation. The reason is this: the air coming out of the supercharger has already been compressed past the 14.7 psi of atmospheric pressure. So, for simplicity's sake, say a turbocharger normally compresses the air at a 2:1 ratio. So, normally, it will take the ~15 psi of atmospheric pressure and compress it it 30 psi.
#22
a centrifugal supercharger type(i.e. vortech) and a turbo would be a tight fit or it might not even fit at all. if you were to twin charge the motor, most people would do a eaton style supercharger(i.e. jackson racing, replaces the stock intake manifold) and a turbo.
http://www.jacksonracing.com/Shop/Vi...eIndexID=45244
here is a old pic of a RB26DETT
http://www.jacksonracing.com/Shop/Vi...eIndexID=45244
here is a old pic of a RB26DETT
#23
Originally Posted by jlaznlover
a centrifugal supercharger type(i.e. vortech) and a turbo would be a tight fit or it might not even fit at all. if you were to twin charge the motor, most people would do a eaton style supercharger(i.e. jackson racing, replaces the stock intake manifold) and a turbo.
http://www.jacksonracing.com/Shop/Vi...eIndexID=45244
here is a old pic of a RB26DETT
http://www.jacksonracing.com/Shop/Vi...eIndexID=45244
here is a old pic of a RB26DETT
THAT is one gorgeously beautiful engine!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
#25
The only point in sequentially mounting compressors is to use one to make up for the loss of compression from the other. i.e. On a big turbo, turbo spool takes longer to generate compression and thus turbo lag. You could use a supercharger to help out with the additional compression while the turbo is spooling, but when it finally generates it's compression then you have to compressors and only need one. (Two compressors eating HP when not needed) You would use a variable compression valve to release the extra compression and keep you from popping the motor. One little supercharger and a turbo would work but in the end parasitic loss is going to catch up and you are going to be producing alot of wasted compression. Very expensive to make up for a little turbo lag.
#26
Originally Posted by ScionGTR
1) Some people were talking about the air going through the supercharger, through the turbocharger, and into the engine. This would produce a very large amount of boost with high variation. The reason is this: the air coming out of the supercharger has already been compressed past the 14.7 psi of atmospheric pressure. So, for simplicity's sake, say a turbocharger normally compresses the air at a 2:1 ratio. So, normally, it will take the ~15 psi of atmospheric pressure and compress it it 30 psi.
#29
The main advantage IMO would come from using two turbos, one smaller and one larger, to provide more constant acceleration under higher boost. Using two turbos opens up a few more options in placement. The piping and hardware would be tough to pack in there... but it may not be impossible. But it would definitely be a large project!
#30
Originally Posted by engifineer
The main advantage IMO would come from using two turbos, one smaller and one larger, to provide more constant acceleration under higher boost. Using two turbos opens up a few more options in placement. The piping and hardware would be tough to pack in there... but it may not be impossible. But it would definitely be a large project!
If anyone did this it would be for show and not practicality.
#32
Originally Posted by TheQuietThings
of course a single turbo on the I4 for the tC would be smarter, but this thread is about twin-charging, and thats why we are all talking about twin _____chargers
#33
Originally Posted by Mediocre Generica
Originally Posted by engifineer
The main advantage IMO would come from using two turbos, one smaller and one larger, to provide more constant acceleration under higher boost. Using two turbos opens up a few more options in placement. The piping and hardware would be tough to pack in there... but it may not be impossible. But it would definitely be a large project!
If anyone did this it would be for show and not practicality.
#34
Originally Posted by Mediocre Generica
Originally Posted by TheQuietThings
of course a single turbo on the I4 for the tC would be smarter, but this thread is about twin-charging, and thats why we are all talking about twin _____chargers
#35
Originally Posted by Mediocre Generica
Originally Posted by TheQuietThings
of course a single turbo on the I4 for the tC would be smarter, but this thread is about twin-charging, and thats why we are all talking about twin _____chargers
#40
Originally Posted by kwc5811
The only point in sequentially mounting compressors is to use one to make up for the loss of compression from the other. i.e. On a big turbo, turbo spool takes longer to generate compression and thus turbo lag. You could use a supercharger to help out with the additional compression while the turbo is spooling, but when it finally generates it's compression then you have to compressors and only need one. (Two compressors eating HP when not needed) You would use a variable compression valve to release the extra compression and keep you from popping the motor. One little supercharger and a turbo would work but in the end parasitic loss is going to catch up and you are going to be producing alot of wasted compression. Very expensive to make up for a little turbo lag.