I drove a 2010 loaded Lariat off the dealer lot yesterday.

It was thr first drive of the 6.4 and my first real look at Superduty after I bought my 6.0 in late '04.

Although the truck's interior was awsome and pimped out to the max, I was so underinpressed with the power of the 6.4 vs my '04 6.0 (stock).

I got down on the 6.4 one time from about 5 mph and expected the rear tires to almost break loose like my 6.0 will do.

Whats the issue here with the 6.4?

Is this typical of the 2010 6.4 with 3:55 vs my '04 6.0 witth 3:73.

I was totally NOT impressed with my drive of the 6.4. It's "like" where was the torque??? I can't see this as a heavy tow vehicle vs my 6.0. How to launch a heavy load in the 6.4 if it doesn't respond with head snaping torque when empty.

Is therre someting in the 6.4 computer that would have limited the performance on this truck..like maybe until break-in or may realized I didn''r have a load to pull?

Please tell me if I drove the wrong 6.4 or what. Maybe unfair to compare 3.73 6.0 to 3.55 6.4 or what?

Was going to buy 6.4, butt now I think definately not.

 

Catfish, remember that 3.55s have only 95% of the torque multiplication than the 3.73s do on your 6.0.

The engine belts out 80 more ft-lbs of torque but "only" has 25 more horsepower. Meaning wide open throttle at high RPMs is not going to feel much stronger than with your 6.0, but there should be a good difference around 2,000 RPMs, which is closer to where you will be towing with.

Also consider that the '08+ trucks are a bit heavier; the 6.4L engine is over 200 lbs heavier by itself!

Furthermore you were comparing a broken-in 6.0 with a brand-new 6.4. There is way more internal resistance on a brand new engine that's still in the break-in process than there is on a well broken in engine. Once it breaks in it should do a bit better.

And lastly the emissions controls dictate that the engine never be overfueled to prevent the DPF from being worn out prematurely; therefore the engine will NOT inject the full amount of fuel until the turbos spin up and build boost to correctly burn the fuel. So even though we have two turbos, throttle response isn't as good as the 6.0.

Honestly you won't know how well these trucks tow a trailer until you hook one up and try it. These are great engines and handle heavy loads remarkably well.

 

i noticed the same thing with mine when i first got it aswell almost like it was de-tuned? but it is alot more reliable than my 6.0 was but not near as fun and doesnt have the clickity-clack of the 6.0.

anyway with the emmision stuff you arnt going to find any manufacturer any different.

I will take the reliabiltyof the 6.4 anyday!!

 

Koboss, your comments about 6.0 reliability have me wondering...

Is your avatar is a pic of a 6.0 block?

 

emissions does delay the response. I found that out as well, but as soon as I could hook up the trailer I did and took it for a spin. So here I am at a left turn, traffic clears I know I have to get on it as I had a 5.4 gas F250 and you had to put it to floor. So I do the same and burn rubber..with 8K behind me.

So it does respond and does well with the turbos all the way thru the powerband where it counts.

 

But the Cummins, launches. Sorry, but it is true... More torque, earlier.... True, I didn't buy one, but if you want torque off the line, it is hard to beat the early torque of that inline 6.

-mike

 

crazy, that is a pic of my old 6.0 warped heads and bedplate leak plus on and on, thats why say i will take the reliability of my 6.4 over my old 6.0 anyday.. did you have good luck with a 6.0? man o man i didnt it was nothing for it to go a month in the shop for repairs and i didnt even drive it..just pay the note on it...
anyway i think my 6.4 will be a lot less in repairs.

 

Naw, has nothing to do with break-in nor interenal engine resistance


Engine weight difference is a measly 200 pounds? Can we make more excuses for the 6.4?

Still wondering why I was so dissapointed in the 2010 6.4 vs my stock 2004 6.0.

Loved the truck mind everybody. But the 2010 6.4 motor simply had no "umph" compared to my '04 6.0.

Still wondering what gives.

Like to hear from those that have owned both and actuually towed heavy with both.

Thanks!!!!

 

Wow. Funny how you ask for reasons why, and then dismiss everything you are told.

Since you are the expert on these matters, why did you even bother asking? And since you know all there is to know, you obviously have made your choice that you prefer your 6.0...

So where's the issue?

Koboss...you weren't kidding about issues with your 6.0! That's awful, even for a 6.0! Hopefully your luck goes better with your 6.4!

 

We have both trucks and your right the 6.0 is snappier and quicker to build boost. I think this is because of the emissions stuff as we see similar issues with GM but not quite as bad.

Towing with both 6.0 and 6.4 you will see a little better performance from the 6.4 than the 6.0 Ford. Now if you do a DPF delete on the 6.4 you will see a big differance because the engine breaths better and puts the sequential turbos to work much better. Overall the 6.4 is a much more reliable engine and is capable of producing a lot more power than the 6.0.

 

I had a 6.0 and just got a 6.4... I love everything about the 6.4 more... Mine launches quite well especially if you get the turbos spooled up a little... it does have more turbo lag than the 6.0 but with all that emissions crap under there what else do you expect... now spartan it and I have heard wonderous things happen

 

I am wondering how many of us bought our trucks for the drag strip? I never expected my 7000 lb truck to launch and jerk my head back. I bought mine to tow a 5er and pass all the chevys,dodges and 6,0's I am able to find lol.

 

Come to think of it, I have had mine on the strip yet, but I have towed with it all over the place.

 

yeah Crazy, i had a tough go with it, my service writer told me that ford dumped $29k into it in warranty parts and thats not with all the service hrs totalled. anyway its probably rock solid now, i kept it for 25k on the new engine and till the warranty had 10k left on the clock and sold it, i changed the oil every 5000kms and it was as clean when i changed it as when i put it in so im sure the guy got a good truck. that being said i like my new truck and am glad international worked the bugs out of this engine and believe it to be rock soild....
on another note and correct me if im wrong but international has been making diesels from day one. and now Ford has ventured into the heavy diesel group... all im saying is that i hope they got there stuff right with only 250,00 mile testing cause international has had its goes with the 6.0 and worked most out now with the 6.4 and look at all the heavy diesels they have on the road/offroad. just glad i got one before 2011 hope this doesnt open a flame on me.....hehe.

 

Scott,
Man i'm impressed. How did you get a 2008 F250 back in 2003? You should have alot of miles on that 6.4 by now. That truck sure does look good in the snow though...