Alot of $$$ in a 6.4 or LMM. Who wins on top end? - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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Old 05-11-2010, 10:55 AM
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Alot of $$$ in a 6.4 or LMM. Who wins on top end?

I have had a few powerstrokes and have done the turbo,injectors,lift pump,tranny etc upgrades and have kept up with the duramaxes and cummins around town.

Recently sold my truck and looking into making another fast truck. My question is... If you do the major upgrades like i have listed above on the 6.4 and the LMM who is going to have the better HP/TQ numbers and 1/4mile times? I have seen some 600hp 6.4s on stock trannys holding up good but also saw them loose to some LMM's with less HP due to the weight difference.

I only tow a 6 place snowmobile trailer in the winter and not much in summer so the whole IFS doesnt mean much to me. I would end up doing a soild axle conversion eventually anyway.

If i got a 6.4 i would run the tranny until it broke then put a suncoast in. With a LMM the first thing i would do is drop one in since i think they are really only safe up to 450hp or something. Also wondering if spartan can do some custom tunes like DP did for me when i get aftermarket injectors,turbos etc?

So basically what i am asking is what truck can run faster on Fuel only with the major upgrades.

Thanks for the help

(also curious about what the 6.7 in house might bring, saw spartans straight pipe video. that beast sounds like a cummins at idle and on take off... i dont know? haha)

Last edited by strokin40s; 05-11-2010 at 11:16 AM.
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Old 05-11-2010, 12:24 PM
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The 6.4 is a beast on a tuner/fuel only. The new 6.7 is showing tons of potential already.

Spartan might do custom tuning, might want to call them.

Why waste money to do a straight axle when Ford already comes with one unless you just want a GM truck? Just asking.

Seems like most of what you want is in a Ford and some other aspects are GM.

Tough decision.
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Old 05-11-2010, 12:25 PM
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Well, youre on a Ford website so you can guess what everybody is going to say. Ill tell you this, from someone who doesnt own either of the two you stated(Dodge guy). I would go with the Ford. The main reason is it is going to be cheaper building the same amount of reliable HP.
Drive line:
Lets say you want a 600hp street and strip truck. In the chevy you are going to need a trans and some serious work on the front end. With the Ford you could get away with a torque converter and possibly an input shaft(depending on how many psi you want to leave the line with).
I believe the engine upgrades are going to be pretty similar but I think the Duramax's bottom end gets a little weaker over 500hp(I may be wrong tho).
If you have it in the budget I would wait and get a 6.7. I think there are high hopes for that engine!
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Old 05-11-2010, 02:40 PM
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Originally Posted by D-Rock View Post
Well, youre on a Ford website so you can guess what everybody is going to say. Ill tell you this, from someone who doesnt own either of the two you stated(Dodge guy). I would go with the Ford. The main reason is it is going to be cheaper building the same amount of reliable HP.
Drive line:
Lets say you want a 600hp street and strip truck. In the chevy you are going to need a trans and some serious work on the front end. With the Ford you could get away with a torque converter and possibly an input shaft(depending on how many psi you want to leave the line with).
I believe the engine upgrades are going to be pretty similar but I think the Duramax's bottom end gets a little weaker over 500hp(I may be wrong tho).
If you have it in the budget I would wait and get a 6.7. I think there are high hopes for that engine!
I would have to agree with d-Rock. But you can get a 6.4 cheap. The 6.4 has been out for 3 years and they are still finding more HP in tuning. Dollar for dollar i think the 6.4 will be faster. Just buy the one you like and go with it.
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Old 05-11-2010, 04:07 PM
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In all honesty....and I hate to say it.....but the LMM is probably going to be faster at the track and on the street with major mods than the 6.4. Not MUCH faster, but with the weight of the Duramax/GM truck being quite a bit lighter, its going to have a big edge over the heavy @ss WELL built Ford truck
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Old 05-11-2010, 05:42 PM
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Originally Posted by 08stroker250 View Post
In all honesty....and I hate to say it.....but the LMM is probably going to be faster at the track and on the street with major mods than the 6.4. Not MUCH faster, but with the weight of the Duramax/GM truck being quite a bit lighter, its going to have a big edge over the heavy @ss WELL built Ford truck

If i get another Ford i will drive all the way out there to have you guys live tune it after the mods. I want to thank you guys at Spartan for what you have done for the Powerstroke market, I have been thoroughly impressed with what your company has done with the 6.4's and am excited for what you'll bring the 6.7! Best of luck!
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Old 05-11-2010, 06:00 PM
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Originally Posted by strokin40s View Post
If i get another Ford i will drive all the way out there to have you guys live tune it after the mods. I want to thank you guys at Spartan for what you have done for the Powerstroke market, I have been thoroughly impressed with what your company has done with the 6.4's and am excited for what you'll bring the 6.7! Best of luck!
Thank you sir! I can't take any credit for that since I have only been a part of the team for a few weeks, but those words are greatly appreciated! I am sure Matt would be more than happy to live tune your truck when the time comes.

As for the 6.7....well, its a whole different animal!
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Old 05-11-2010, 06:48 PM
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After owning a few Duramax's I will have to say the LMM. Like Jeff said the weight alone gives them a advantage. You have to give credit where credit is due,at least GM has had a good engine since since 01 and well you know the rest.
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Old 05-15-2010, 05:11 AM
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On top of the weight, I think that if you are really going to dump the money in it right now, the d-max has a more extensive aftermarket and would be easier to upgrade the major mods.
That being said, the powerstroke is gonna be alot cheaper to get to about 600 hp. That can be done with just about stock everything! I think I remember that when Rudy first built his truck he was over 600 with stock injectors and stock turbos. At this level you can leave the tranny basically stock as well.
I would say that if you are trying to get 600-650 on fuel stick with the powerstroke, beyond that you probably would be better off at with the dirtymax.
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Old 05-15-2010, 10:04 AM
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Let's not forget that the limit of the bottom end of a dmax is right around the 600hp mark give or take a few based on tuning and mods. That pretty much means you can nitrous the chit outa the ford and make 750 at the wheels on a stock motor (might want studs) versus if you did that to the chevy you gonna bend rods and all sorts of other gnarly stuff that can happen if you do your research and but the right parts you can smoke most dmaxs all day long.
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