Is the new 6.4L psd a twin turbo design? I have a friend who seems to think it is only gonna be a single turbo.

 

actually, you are both kinda wrong. it is supposed to be sequential turbos, one bigger one and one smaller.

 

that is what I meant if that means what I think it does. The smaller turbo helps reduce the bigger turbo's lag time or am I completly wrong. I have also heard it is for emissions.

 

Yes, two turbos inline with a small one for quick spool, and a larger one for the grunt.

 

thanks for the replies. My friend kept saying it was going to be a 6.8L single turbo because they couldn't get the inline turbos to work right.

 

I dont know try www.fordvehicles.com/trucks/2008superduty or the engine forum

 

I work at Kentucky Truck Plant, the new diesels are 6.4 with twin inline turbos. Hope this helps.

 

One turbo is fixed, one is variable (like on the 6.0L). Or so I've been told.

 

Ford's engine is like others said. Navistar's 6.4L is a single turbo that isn't rated as high as Ford's.

 

What are Navistar's ratings?
Ford's is expected to be 350hp, but some people who claim to be in the know on some other diesel forums are saying that number is actually gonna be revised to be higher when the 08's hit the showrooms, kind of a marketing ploy in the HP wars of the big three. True? I don't know, only speculation is my guess.

 

http://129.33.208.100/maxxforce/prod...d=1&itemid=002

The MaxxForce 7

Specifications
Configuration: V8
Displacement: 6.4L (390 cu in)
Power Output: 200-230 hp (149 - 171 kW) @ 2,600rpm
Peak Torque: 560-620 lb. ft.(759 - 840 N m) @ 1,400rpm
Aspiration: Turbocharged
Combustion System: Direct Injection
B10/B50 Life: 262,500/375,000 miles
Dry Engine Weight: 1,150 lbs.

Here's the MaxxForce 5 incase you wanted to know.

Specifications
Configuration: V6
Displacement: 4.5L (275 cu in)
Injection System: Electro-Hydraulic G2
Power Output: 200 hp (149 kW) @ 2,700rpm
Peak Torque: 440 lb. ft.(596 N m) @ 1,800rpm
Aspiration: Turbocharged
Combustion System: Direct Injection
Injection Pressure: 1,600 bar
B10/B50 Life: 250,000/408,500 miles

 

I hope they didn't say the same thing about the 6.0's cause we all know how that turned out in terms of reliablity and fuel economy compared to the previous 7.3, well at least the first couple years of the 6.0 anyways.