The 6.4 HD Hemi Thread

snapper · Dec 14, 2014

I picked mine up last Saturday and love this truck. It is amazing how nice the interior has improved in just 3 years.

tlucier · Dec 14, 2014

Nice truck snapper! I had a 2008 that was really close to the same color. It's an awesome paint color.

tjfdesmo · Dec 14, 2014

tlucier said:
Thanks tjfdsesmo! Not sure where in AZ your located but I'm looking at heading out that way to Lake Havasu City early next year to pick up a YJ Wrangler with my 20' gooseneck trailer. Hope it pulls well all the way back to the right coast.

I'm in Wickenburg.

millhunky · Dec 14, 2014

Hey, snapper. Im just south of pitts here

jpro · Dec 15, 2014

snapper said:
Our trucks could be twins, except mine is a tad longer with the mega cab. I have loved this color for some time. My 2011 Ram sport was the same color

Beautiful truck! I love my Mega :favorites13:

mikeysotp · Dec 16, 2014

Hey, I'm officially a loser. I read every post on all 201 pages of this thread. Took me a couple of nights but I did it. I am looking to order my 3500 6.4 soon but I have a question. Is there any way around the detuning on the mega cab? If not, is it really an issue since you still get the full torque? I'm not looking to race the thing but I don't want to drive a dog either.

loveracing1988 · Dec 16, 2014

mikeysotp said:
Hey, I'm officially a loser. I read every post on all 201 pages of this thread. Took me a couple of nights but I did it. I am looking to order my 3500 6.4 soon but I have a question. Is there any way around the detuning on the mega cab? If not, is it really an issue since you still get the full torque? I'm not looking to race the thing but I don't want to drive a dog either.

It is not detuned, it is the same output but the rating you see is at a different rpm than the others are rated at for sound reasons with that particular cab configuration.

mikeysotp · Dec 16, 2014

loveracing1988 said:
It is not detuned, it is the same output but the rating you see is at a different rpm than the others are rated at for sound reasons with that particular cab configuration.

So you are telling me that if I put that truck on a dyno I would see 410 and not 367? I can't imagine they would advertise a lower power number if it isn't accurate.

ForceofWill · Dec 16, 2014

mikeysotp said:
So you are telling me that if I put that truck on a dyno I would see 410 and not 367? I can't imagine they would advertise a lower power number if it isn't accurate.

It is accurate to that rpm. And you wouldn't see either of those numbers on a dyno.

mikeysotp · Dec 16, 2014

ForceofWill said:
It is accurate to that rpm. And you wouldn't see either of those numbers on a dyno.

Yeah, I understand that, brain fart on my part. You could put it on an engine dyno though. I think you get my point. Crew cab and mega cab are going to give a completely different result.

Are you saying it is just a rev limiter. If so has anyone found a way around that?

regularcab2500 · Dec 16, 2014

It does have to do with how the engine is programmed..1 tons are usually tuned for lower rpm to increase longevity of the motor hence the lower hp rating...but those numbers they advertise are at the crank not the rear wheels so a mega would dyno different than a crew but on an engine dyno they should by rights come up with similar numbers

loveracing1988 · Dec 16, 2014

mikeysotp said:
Yeah, I understand that, brain fart on my part. You could put it on an engine dyno though. I think you get my point. Crew cab and mega cab are going to give a completely different result.

Are you saying it is just a rev limiter. If so has anyone found a way around that?

It will spin to the same rpm and make the same power, they are litterally the same engine and programming. The only reason they market a different number is because of how it has to be rated. You could drive a crew and a mega back to back and notice no difference in power besides the added weight of the mega cab.

NewBlackDak · Dec 16, 2014

1 tons are down-"RATED", because of DOT regulations and cab noise levels. There is no difference in the engine, programming, or power output.

mowin · Dec 17, 2014

NewBlackDak said:
1 tons are down-"RATED", because of DOT regulations and cab noise levels. There is no difference in the engine, programming, or power output.

Not all 1 tons are down rated, only the mega cabs per Rams web site. I did test drive a 3500 srw mega back to back with the 3500 srw I ended up buying, and didn't notice any difference.

regularcab2500 · Dec 17, 2014

My mistake i was thinking of the chassis cabs with the aisin tranny..limited to 4660 rpms according to allpar

regularcab2500 · Dec 18, 2014

Has anyone had any issues with the mufflex kits or high flow mufflers? Im mostly worried about codes and emmissions..id like a high flow muffler but im not sure if it will affect the emmissions sensors

ForceofWill · Dec 18, 2014

I have a Magnaflow catback on mine and it's fine. As long as you don't touch anything upstream of the cats with the O2 sensors you'll be fine. Mufflex is after the Y pipe.

regularcab2500 · Dec 18, 2014

And what if i replace the cats too? If im replacing the exhaust id honestly like to make it flow as best as possible and its gonna be the first thing i actually change on the truck

loveracing1988 · Dec 18, 2014

regularcab2500 said:
And what if i replace the cats too? If im replacing the exhaust id honestly like to make it flow as best as possible and its gonna be the first thing i actually change on the truck

Why? What are you going to gain? Maybe 5hp? No one has tried that yet, I would assume that you will throw codes for that. A tuner can disable to downstream o2 sensor more than likely. If anything throw the mufflex kit on it and replace the crushed sections of pipe that form the y pipe and you will be good to go.

regularcab2500 · Dec 18, 2014

More for the thought im polluting the environment more lol jk [emoji14] but im just trying to make sure that if i replace this stuff and void the warranty its not gonna **** with anything else..id rather do it right the first time which is why im wondering if the cats are worth a ****...im gonna need them regardless because i live in ny

It has little to do with power gains..its mostly just a start to my mods..i plan on doing all the standard "go fast" mods before i lift it or any of that and this is the one id like to do first..

The 6.4 HD Hemi Thread

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