TowRig.com - Diesel Discussion and Tow Tech

Just trying to stir up some activity, who thinks they have the fastest Diesel powered rig here and why? This is for the guys who use their rig to haul ass!

Race weight- 7300lbs with driver

14.30 traction limited in 4wd

Looking to hit high 13's with tranny upgrade:D

John

well i am in i got the cpu reprogramed for some extra hp 100 and a whicked wheel in turbo and the banks bighead a little out so i hold the presher up a little to long 34 PSI the speck is 38 and the spring mod to the fuel pump like 3psi over stock -- makes BLACK SMOKE :)

but it is a X hevey and more set up for towing

Since mine is completely stock I'm obviously not near the fastest....but we'll see in a year or so.:D

Since mine's a stick it will never be the fastest, but kudos to those with the nerve to BOMB $40,000 trucks, I could never do it. :)

Since mine's a stick it will never be the fastest, but kudos to those with the nerve to BOMB $40,000 trucks, I could never do it. :)

that is just the think the 7.3 is made for ford by internatanal and is detuned for ford and then put in the F trucks so all i an doing is seting it to the internatanal specks and i do plan on keeping it a long time ( see the extra filters in sig)all the mods i have dun only come in play when you press it hard and i will not do any thing that i think will bomb it

that is just the think the 7.3 is made for ford by internatanal and is detuned for ford The PS, DM and Cummins are all detuned.

Depends on what you mean by fastest. Mine won't be the quickest, but it might hit the highest top speed in double overdrive.:D :rolleyes:

Looks like there are at least 2 here (so far) that will beat mine with high 14s, low 15s. But at near stock and 7500 lbs on 33" tires and 19 mpg, I aint complaining. :D

The PS, DM and Cummins are all detuned.

The Duramax is far from De-tuned. The Duramax in its current form really isn't capable of much more before it is going to need serious overhauling. The Cummins will continue to raise the bar and I'd bet this will result in serious changes.

The 6.0L Powerstroke is not even in competition with the Duramax or Cummins for power anymore, it is out classed by both.

YOu're going to get a LOT of disagreement there. You'll have the dmax guys up in hands now. I'm sure BadDog is going to have something to say. ;)

Your trying to make a joke, right? DMax not detuned? Not capable of much more before it is going to need serious overhauling? ROTFL!

Tell that to guys running custom computers and "stacks" (more than one box in tandem) getting low (and below) 13 second times in 7500lb trucks with nothing more than head studs (and some without). And making more verified dyno'd power than a Cummins can put down without needing o-ringed heads and other internal mods. Or I could be wrong, maybe that took turbo tweaks for the DMax? But I have yet to hear of a single puller or drag truck that's needed any significant motor upgrades unless it was one of those WAY out there, pushing the edge or "test mule" trucks. Several guys are running over 500 hp and 1000 ft/lb trucks as daily drivers and weekend warriors. I know of one guy who tows his drag car and service trailer with one, and then unhooks to race the truck! :D

I'll give you that the Cummins bottom end is probably ultimately capable of more, and the o-ringed propaned/nitrosed, twin turbo (and the like) Cummins still rules at the pulls and drags, but the DMax with little more than a chip (the after market is only recently getting involved with custom turbos and the like) still competes and sometimes takes the prize.

At least this was all true based on what I've read up to about 6 or 8 months ago when I quit paying attention…

Tell that to guys running custom computers and "stacks" (more than one box in tandem) getting low (and below) 13 second times in 7500lb trucks with nothing more than head studs (and some without).

You've missed the point. GM isn't going to build trucks that way and warranty them. When the Duramax came out, it was 300 HP and 520 ft lbs. Now it's what, 305/600? Either way they've pushed the envelope--relatively stock trucks are hitting high EGTs as it sits. The Cummins 610 motor is the same way...1300 degrees loaded on a mountain is pretty common, even not to full GCWR.

These engines are not de-tuned. Without exhaust modifications, they're capable of hitting unsafe EGTs with their stock programming. No matter how much power a Diesel engine makes, it can always make more. It's just a matter of how long it'll last at that power level.

I'd say that the Duramax in its current configuration is going to need some improvements before it will be able to offer more OEM power. If not, I'm sure the engineers would have tuned it to exceed the Dodge/Cummins trucks simply so their number would look better.

I really don't think that the Dodge is capable of any more from the factory right now either. They already changed the turbo casing for 04 so they could run 4" all the way to the turbo to decrease EGT. What's next? Factory 6" straight pipes and twins?

;)

Your right, I did misunderstand your point. And on that I agree. But I still disagree with your use of the word "detuned", which was the root of the misunderstanding. They are, in fact, "detuned" by definition since they are capable of producing MUCH more power with only (relatively) mild "tuning" and (reasonably) negligible effects on longevity. However, we agree that changes must be made before the manufacturer can feel comfortable providing these trucks and warranting them at the higher output, not the least of which would be transmission longevity and EGT issues, not to mention perhaps other chassis limits. But the engine itself is easily able to handle the turned up output without serious adverse effects on longevity. So, with improvements in the exhaust and transmission on the DMax trucks, you can safely and reliably provide 50% increases (or more) in power using nothing more than a chip.

Well back to the orginal topic,

15.8 in my GMC 2wd 2500 with a 350HO :)

2006 the D-max should be coming factory with optional 5" exhaust and a 700 ft/lbs of torque rating in a "performance 3/4 ton:rolleyes:". They still have plenty of room to grow.

And on that I agree. But I still disagree with your use of the word "detuned", which was the root of the misunderstanding. They are, in fact, "detuned" by definition since they are capable of producing MUCH more power with only (relatively) mild "tuning" and (reasonably) negligible effects on longevity.

I guess this is where I misunderstood. De-tuned to me, means, while the engine may be capable of more (such as with the Cummins in OTHER applications, it has factory numbers much higher than pickups are available with) and has to be de-tuned from those numbers to achieve the necessary longevity in pickups.

De-tuned to me means that it already has a higher power output level available somewhere else, but it has to be "turned down" to be installed in this application. While this IS definitely true for the Cummins, and at one time was true for the PSD and may still be, I'm not sure that the Duramax is available anywhere else with more power than it has in the pickups, but I coudl be wrong.

I'm not sure that the Duramax is available anywhere else with more power than it has in the pickups, but I coudl be wrong. IS that V8 6.6 even used in anything else? I am under the assumption that the heavier trucks equipped with Dmax's have 6 cylinder versions, like the 4500-5500 trucks.

Tim, no biggy, just differing definitions I guess. Not sure if the DMax is available anywhere else with bigger numbers or not.

Bobby, isn't it avialable in the Top Kicks? <shrug> Not sure, seems like I read that though. No idea on the power levels if it is in fact available in the MDs...

Bobby, isn't it avialable in the Top Kicks? <shrug> Not sure, seems like I read that though. No idea on the power levels if it is in fact available in the MDs...I'm positive Gm uses them in the Topkicks, but I had heard they were a different engine, a 6 cylinder Dmax.

I'm positive Gm uses them in the Topkicks, but I had heard they were a different engine, a 6 cylinder Dmax.

6.6's are readily available in Topkicks and other GM medium duty trucks. From there you can option the Cat or the 6HK1-TC Duramax, which is a 7.8L I-6. It shares nothing in common with the 6.6 at all, besides the name.

6HK1-TC Duramax, which is a 7.8L I-6. It shares nothing in common with the 6.6 at all, besides the name. Thats what I thought I read one time. An inline 6 dmax was used.

Are there any marine-version Dmaxes with more HP?

I'd imagine not due to the aluminum heads, but it's a possiblity with a closed cooling system.

Tim the AL head gets a bad rap. It is proving itself to be a good strong design that can handle abunch of boost. I have heard of a guy pushing almost 80 pounds of boost by accident with a twin turbo setup.
The heads can take a lot more than they get credit for.

Not to mention Isuzu has been using the aluminum head design for a LOOOOOONG time, it was a proven design 30 years ago.

There is nothing wrong with the aluminum heads. You guys both need to read my post again.

Boats, as you probably know, commonly cool the engine with raw water. Raw water would corrode the crap out of a set of aluminum heads, thus why I said any boat that had a Dmax would have to have a closed cooling system.

So, I'll ask the question again. Is the 6.6L Duramax available in anything else, with more power? Boats?

Is diesel fuel used at all in marine applications?

Hmmm, I guess a tug boat or biggass boats have diesel engines, do they?

My pops hade a 1953 double ended fishing boat with outriggers that had a 4 cylinder Volvo Penta diesel engine. He would sit on the valve cover as we drove around the bay, since the engine was uncovered right in the middle of the wheelhouse. Does that count?:D rotfl

Ya Tim I read it agian and was wondering if that is what you meant.

Kinda funny as I am sitting at my desk going through catalogs ordering pipe identification labels that say raw water.

Yes, diesels are used a lot in marine applications, and are becoming more and more popular is smaller boats, as in under 30'.

Tim, no, the Duramax is not used in Marine apps because of the agreement between GM and Isuzu. Gm gets to use it in their trucks, and Isuzu gets to use it in their DMAX trucks sold in Asia, and nobody else gets it. It has nothing to do with the aluminum heads. There are many outboards with aluminum heads, and they are all fine. Within the next two-three years you will see an aluminum block'd outboard as well in a further effort to reduce the weight of 4-stroke outboards, which is the biggest killer to their sales. Thats why mercury is now building the small displacement supercharged, I-6 outboards, more power with less weight, but it takes a lot of RPM to develop the power and they are WAY to expensive still.

I dont' know about fastest, but mine put out right at 400 HP, and right around 900 FT Lbs tourqe. It's kinda ugly for a stock clutch. :eek:


Southbend upgrade is next on the list.

Rob

I would assume the Dmax is not offered in anything else with more power then if it's not available in boats.

I used to work on boats, and I've never seen an inboard engine with aluminum heads and an open cooling system. They always had heat exhangers if they had aluminum block or heads.

Mercury even has an aluminum block with a cast iron head from a Ford 460 for a motor. waytogo rotfl

Is diesel fuel used at all in marine applications?

Hmmm, I guess a tug boat or biggass boats have diesel engines, do they?

Any boat over 35' or so, generally has a Diesel engine.

Gotta love the DMax. Chip, exhaust, and trans upgrade will get you 11.49 at the track. :D
Video (http://www.nolimitdieselperformance.com/eleven.mpg)
Edit: Oops, my mistake, looks like that truck is now running nitrous and LP.