Having more than one turbo on an EVO motor has been a matter of some interest, but has never really caught on:

Twin Turbos I.

Twin Turbos II.

Sequential Turbos.

Compound Turbos.

The idea of a small turbo for low end power and a large turbo for high end power certainly sounds good on paper. However, any EVO setup with two turbos would be an extremely tight fit at best.

Garrett now has a single sequential turbo (SST). This is a small turbo and a large turbo on the same shaft. One hot side with two cold sides! This turbo will see production on the new Ford Powerstroke.

Ford 6.7L Powerstroke Diesel.html

Would this work in an EVO?

 

Unless you are running well above "normal" boost levels, what do you think would be the added benefit of such a system?

That turbo is pretty cool, as it should eliminate a lot of the thrust loads having the back to back compressors. Only down fall is that both wheels use the same outlet so compound charging with it is not possible. The dual turbine inlets takes "twin scroll" to a whole new level though.

 

That thing is Gnarly. I can't wait to see what those new diesels put down chipped.

 

mid to high 14's. lol.

 

One shaft with two compressors? Wouldn't that create an enormous amount of lag? Never mind....looking at the design...doesn't look too bad.

 

I bet the two separate sections, 180 degrees apart, for the exhaust pulses could resolve that nicely.

 

I have built about 60 of these trucks on my shift alone and about 130 total. I work at the Kentucky Truck Plant where the Super Duty is built.

Stock power is rumored to be 390 to 400 hp and 730 to 750 trq. If its the higher numbers, that would put the 6.7L 50hp and 100 lbs of trq over the soon to be out going 6.4L in stock form.

This engine is like 80% cleaner than the 6.4L and it also idles VERY quietly.

 

I have two friends with ford diesels. One is the older dually while the other is the new super duty.

The kid with the dually has it running 11.5's at 40 psi. While the other guys just has his chipped and exhaust running about 30 psi I think. Truck does run and idle smooth. Power feels good too.

 

Trick Sh!+

 

DANG IT!!!

I thought about this like three years ago, my idea was very close to the same... a single hotside, and the coldside would have essentially 2 wheels the smaller one would spool up very early, where the larger wheel would have a sort of slip clutch and spin up later.....

I pretty much figured that it wasn't worth pursuing, because the variable vane technology out there...

I think it would we worth giving it a shot on a evo... the concept is pretty cool either way!