Single or Twin turbo setup for 360?

rumblefish360 said
I get that. Just for say… if a 70mm turbo is right for the 360 and a bad choice for a 4 banger, wouldn’t make sense to use a smaller turbo for the 4 banger? Of course it would. Unless someone is going to split a hair somewhere on me.

Are we towing with the 4 cyl.? If we were, what size turbo would YOU put on it? A 35? A 50? 70mm? Would the 70mm be about right for a 360 for this towing? Or is a large one, like I suggested not to use, like a drag racing set up?

Let’s say the 4 cylinder is a 3.0. Half the 360. Then would a 35mm turbo be right? Let’s run it around the other way. If the 70mm turbo is right for the 360 in a towing application, would a 100+mm turbo be OK for towing? Or better for racing.

Seems to me this is a area where nothing was defined but internet hero’s want to pick apart and talk **** about without answering any questions and even more so pertinent questions to the issue. Just side steps and insinuating or ish comments.

I’m not dogging you MoPar R&D

Give who the Benny of the doubt?
I’m not getting it now.
I’d love to learn this myself.
So - seeing boost at 2500 (or less) means what to you?
7, 10. 14 lbs.?
Come 2K, is it OK to see 1 or 2 lbs.?
Or should I wait until 4500 or 5K for boost in towing?

And my suggestion on getting the boost in earlier rather than later is a bad one but yet you point to a factory set up doing this with what your saying is an oversized turbo when not towing but oK when towing? This is a thread about towing right?

I’m about to write hypocrite in caps here bro!

Seems to be a lot of assumptions made on me here.
Even more so that I never made a specific recommendation on a turbo size. I just said boost early. Seems like some people think I would suggest (or I am suggesting) 14lbs. @ 2K.

I’m waiting on TT5.9mag to answer my questions.

OK then... well to address my comment about the 7.3 PSD, Ford/Navistar realized that wasn't the ideal setup and went with a VGT turbo on the subsequent 6.0 PSD. They made up for the increased boost at low RPM (and thus increased fuel consumption) by making the engine itself smaller and more efficient.

This turbo stuff isn't quite as straightforward as putting together a combo for a typical Mopar gas V8. My comments aren't intended to be "be-all-end-all" answers to anyone's questions just things to think about because it's a very complicated subject. Having early boost isn't a "bad" idea it's just not exactly optimal, in my mind because low RPM is where gas engines are most likely to encounter knock and the last thing you want to do is load a gas engine down hard at low RPM and hit it with a bunch of boost.

Case in point the Ford "Eco"Boost engines in the trucks. People get worse gas mileage towing with those than with the N/A 5.0L V8 because the engine is simply too small for the load and the AFR needs to go super rich to keep the engine from melting down.

Again, saying this more for everyone to gain something useful (hopefully) not really directed specifically at you.