F-450 Turbo slapped on a turbo?!!
#16
LOL. Ford is pretty proud of their Twin turbo setup, and lots of people hear that "even the turbocharger has a turbocharger" and are all blown away by the sound of it. All it means is that, like other said, essentially there are two turbos, one for lower powerband to provide boost where the bigger one would be lagging, and the big one to provide boost where the smaller one would out of it's efficiency range, and just as a single engine and turbo have a symbiosis is powering each other, these turbos do the same for each other.
Last edited by hokiruu; Nov 3, 2007 at 01:59 PM.
#17
Pics aren't needed to explain... just think of the discharge on one turbo going to the inlet of another turbo. Its very common on sled pullers and those running p-pumped rigs. Best of both worlds... little to no lag and big turbo power. GT38 was a ***** to spool on the older powerstrokes like mine.
#21
#22
Simple math:
Lets say the big turbo flows a max of 3 bar of boost into the small turbo which can flow also 3 bar of boost max. So the 3 bar of boost is boosted 3X to 9bar of boost or 130 psi if you were to let it reach that insane pressure.
#23
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From: Jeffersonville, IN / Louisville KY
I work at the Super Duty plant and build them. Like other people have stated, the smaller turbo is basically there to spool the bigger turbo. I was told that the smaller turbo is almost at full boost off of idle. With the new 6.4, they aren't using Garret turbos anymore and switched to Borge Warner turbos.
I have the luxury of looking at these big turbos on a nightly basis cause I work right where the engine is placed on the chassis. The guy one job down installs the down pipe.
When we wre told the 08's were gonna be turbo, everyone thought it was gonna be a true twin turbo with a turbo on each manifold.
I have the luxury of looking at these big turbos on a nightly basis cause I work right where the engine is placed on the chassis. The guy one job down installs the down pipe.
When we wre told the 08's were gonna be turbo, everyone thought it was gonna be a true twin turbo with a turbo on each manifold.
#25
I work at the Super Duty plant and build them. Like other people have stated, the smaller turbo is basically there to spool the bigger turbo. I was told that the smaller turbo is almost at full boost off of idle. With the new 6.4, they aren't using Garret turbos anymore and switched to Borge Warner turbos.
I have the luxury of looking at these big turbos on a nightly basis cause I work right where the engine is placed on the chassis. The guy one job down installs the down pipe.
When we wre told the 08's were gonna be turbo, everyone thought it was gonna be a true twin turbo with a turbo on each manifold.
I have the luxury of looking at these big turbos on a nightly basis cause I work right where the engine is placed on the chassis. The guy one job down installs the down pipe.
When we wre told the 08's were gonna be turbo, everyone thought it was gonna be a true twin turbo with a turbo on each manifold.
#27
5psi from the small turbo feed into the big turbo and BAM, 25 psi total.
#29
tractors have been doing compounding turbos for ages. Superstock tractors can run up to 4 turbos and 250 psi of boost. Compounding creates alot of boost and also creates heat, but diesel engines like heat (to an extent)
See picture below. There a 3 LARGE turbos on this tractor. The 2 shown feed another larger one which is hidden behind.
Edited image
See picture below. There a 3 LARGE turbos on this tractor. The 2 shown feed another larger one which is hidden behind.
Edited image
Last edited by Autoilluminate; Nov 4, 2007 at 05:48 AM.
#30
Have gas engine ever done this to a smaller extent to allow for more boost with little to no lag? I realize that when talking huge boost you have huge heat, but if we compound turbos to get 30-40 psi simply to have boost off idle, I think this would be a great advantage.