That link is excatly what I need thank you. Me and my dad can fab up all the piping (hot and cold) and the turbo to engine mount I just need the s400 outlet flange ant the oil feed tubes.

 

So who can explain the dual/sequential turbo setup on the ford? How does that work

 

Stroke this what kind of boost pressure do you see. In diesel power they said it was around 42psi WOT but the factory gauge only goes to 40.

 

the factory gauge goes to 40 and that gauge for me has never read pst around 36. its kinda hard to tell what PSI you are at exactly so 36 is a guess

 

Is that a factory pyro beside the fuel gauge. If it is I wish dodge would add the boost and pyro gauges to thier dash the next time around.

 

It's either that or tranny temp.

 

tranny


short message

 

Looks like tranny temp to me. Notice the little gear in the center?





So riddle me this, Batman. Wouldn't it be better for the small turbo to feed the larger turbo? Doesn't the smaller turbo put a bottleneck in the system?

 

I believe that the best way to explain how the compound turbo's work is this. If you have your garden hose on at wide open flow hold it to chest height, the water will come out at ? many gallons per hour. If you were to put your thumb (top charger) over the end of the hose, the gallons per hour has not changed, however, the pressure behind the same gallons per hour has now increased, and will shoot out about 10 feet. The compounds work in relatively the same way.

 

Better description would be to put an inline pump before the nozzle to increase pressure!
Compound twins DO increase the air mass... which increases the pressure at the gauge.
Twins, at say 45 psi, will have more O2 molecules per sq inch,than say an HX-35, or an HX-40 at the same gauge reading!

RJ

 

not sure if you guys figured out the big-little turbo thing yet but heres what i think...

one big advantage of sequential turbos is how quick the little one spools up while the big one catches up so they give the little one pre and post advantage because quicker spool is more important when boost pressures of over 60 are easily attainable...

let me clarify my reasoning most people who want twin turbos on a cummins dont really need all the boost those two are capable of, they just want the boost capability of a giant turbo with the spool of a little one.

EDIT: well i was pretty sure i could put it more clearly than you guys but i too managed to make my post fairly hard to follow

 

Heres my take on it:

The small/top turbo sucks air through the large/bottom turbo until the large one lights. When the large one is pressurizing air it force feeds the small turbo and the small turbo takes the already pressurized air and pressurizes it more/compounds the pressure.

The large turbo moves large quantities of air and the small turbo takes that volume and adds pressure.

 

The smaller turbo can't "feed" the bigger turbo. The bigger turbo is MUCH hungrier and wants more food than the little one has in the pantry.

;D