SUPER CHARGED GASSER??

[Nytroty]

The newer diesels, yeah. Without modifications that basically destroy the warranty and make them emissions non-compliant they do get pretty crummy mileage. But if this fella is talking an older, pre DPF diesel, With noting but an aftermarket exhaust and some simple (custom, not cookie cutter) tuning its not irregular for an 8000 pound duramax to return 22+ MPG unloaded. The first generation duramax engine averaged 19-20 MPG unmodified. Mine still gets 18 while producing just under 700 HP.

You May be right. I have just not seen it. We have taken several Duramaxs tuned and stock. We have taken several 6.0 fords with chips and exhaust and on our last trip we took a 6.4 with a spartan chip and exhaust on the 210 tow setting pulling a 4 place open trailer with a sledeck in the back it was getting between 7-9 mpg going across south Dakota at about 65 MPH. The stock 08 F450 with all the DPF stuff on got the exact same mileage going the same speed. I am not saying there aren't guys out there getting the mileage but everything we have taken out has gotten at most 1-2 MPG better than the Gasser right in front of it or behind it on the same trip. I will agree that the Diesel seems like a much more relaxed drive as it hardly ever downshifts and seems to have more than enough power but the mileage has never proven itself on our trips going from MN to WY.

 

[MORSNO]

99% of those out there towing even 3 days a week wouldnt be using a 1/2 ton to begin with..let alone gas(although with that said..best bone stock puller out there that I have seen is a 8.1(at work we have them all from 3500's thru the 6500's..gas and diesel with the allison..).by far the truck of choice when the boys have to haul a load across the state they grab the keys to one of the 8.1 trucks....

You May be right. I have just not seen it. We have taken several Duramaxs tuned and stock. We have taken several 6.0 fords with chips and exhaust and on our last trip we took a 6.4 with a spartan chip and exhaust on the 210 tow setting pulling a 4 place open trailer with a sledeck in the back it was getting between 7-9 mpg going across south Dakota at about 65 MPH. The stock 08 F450 with all the DPF stuff on got the exact same mileage going the same speed. I am not saying there aren't guys out there getting the mileage but everything we have taken out has gotten at most 1-2 MPG better than the Gasser right in front of it or behind it on the same trip. I will agree that the Diesel seems like a much more relaxed drive as it hardly ever downshifts and seems to have more than enough power but the mileage has never proven itself on our trips going from MN to WY.

Watch out, the oil burners are going to be all over you guys for your honesty.

 

[milehighassassin]

The newer diesels, yeah. Without modifications that basically destroy the warranty and make them emissions non-compliant they do get pretty crummy mileage. But if this fella is talking an older, pre DPF diesel, With noting but an aftermarket exhaust and some simple (custom, not cookie cutter) tuning its not irregular for an 8000 pound duramax to return 22+ MPG unloaded. The first generation duramax engine averaged 19-20 MPG unmodified. Mine still gets 18 while producing just under 700 HP.

My step father had a 2003 Duramax that he had no issues getting 23. He pulled off 26 in good conditions.
He did have a topper that I think helped 1-2.


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[mike_s]

You May be right. I have just not seen it. We have taken several Duramaxs tuned and stock. We have taken several 6.0 fords with chips and exhaust and on our last trip we took a 6.4 with a spartan chip and exhaust on the 210 tow setting pulling a 4 place open trailer with a sledeck in the back it was getting between 7-9 mpg going across south Dakota at about 65 MPH. The stock 08 F450 with all the DPF stuff on got the exact same mileage going the same speed. I am not saying there aren't guys out there getting the mileage but everything we have taken out has gotten at most 1-2 MPG better than the Gasser right in front of it or behind it on the same trip. I will agree that the Diesel seems like a much more relaxed drive as it hardly ever downshifts and seems to have more than enough power but the mileage has never proven itself on our trips going from MN to WY.

I agree with you, its getting harder and harder to squeeze mileage out of these newer diesels, which is why i have kept my '04. its also getting harder and harder to be able to tune them, by that i dont mean buy a tuner from a big company, but tune them yourself. The companys that offer the software to be able to tune them yourself are less and less willing to break the factory coding due to pressure from the EPA. Hell, HP Tuners was one of the big ones, and they have officially anounced that they will not be offering support for the LML duramax diesel. H&S has been taking a raft of harrasment for their work on getting tunes made to work on the same engine. But the bottom line is, it can be done, if you're willing to take the time and spend the money to do it. Problem is, its getting to the point that it is simply more economical for most to burn gas instead.

 

[niles]

My truck has the dpf on it and it makes decent power, but mileage is bad. I get 12 mpg doing my daily routine,Skid loader trailer, cargo trailer and some highway driving empty. I will not be getting another diesel. GM should have a new body and engine out soon.I think i will wait and see what they bring.

 

[rmk01r1der]

Put the money you were going to put toward that new truck in efi live, exaust, egr delete, intake, and fuel. Way more fun. IMO Or buy an 8.1 (that'll still spank the suped up 6.0 lol)

 

[mike_s]

My truck has the dpf on it and it makes decent power, but mileage is bad. I get 12 mpg doing my daily routine,Skid loader trailer, cargo trailer and some highway driving empty. I will not be getting another diesel. GM should have a new body and engine out soon.I think i will wait and see what they bring.

If you're out of warranty, dont have to have emissions inspections, and dont mind doing some minor work to the truck there is no reason that you cant have that old girl turning back low 20's in mileage. The trouble is that the EPA has GM running these trucks so messed up in order to get the NoX and particulate emissions to meet their requirement that half of the power the engine is capable of maiking is choked back by all of the emissions equipment and tuning required to just to have the truck on the road. I have personally seen and tuned an '08 LMM duramax that averages 21 MPG unloaded on the highway with just an exhaust and tuning. Same engine as your '07. And the cool part is this can be done with minimal increases in power and no increased wear in the drivetrain if so desired.

 

[Dogmeat]

I'm in the market for a new truck pretty quick. I curently drive an 07 Duramax and was thinking about ditching the diesal and getting a 6 ltr. My question is anyone turning those things up any and how. Maybe a supercharger or something. I suppose you void warranty. The eco boost is making huge power from a 6 cyl. Why cant some one make more power from a v8?

IMO, a supercharged 6.2L GM Gen IV smallblock would be awesome, IF and only IF it was mated to the 6 spd 6L80E or 6 spd allison transmission. The 6.0's and varients don't get near as good of mileage as you'd hope, and they don't tow as well as the 8.1Ls did, but they do tow better than the 5.3 and IMO the Ford 5.4's do.

I've seriously considered this as well since I really don't want the headache and extra costs associated with the diesels and I can't get a big block in a GM 3/4 or 1-ton truck anymore.

I wouldnt expect very good mileage with it, but it'll tow whatever you put behind it and will be about a buck a gallon less to fill up than a diesel, be way cheaper to fix, buying a 6.0 or 6.2 and supercharing it will still cost you $5,000 less than buying a diesel up front .... and .... you never have to worry about it not starting when its cold.

My $0.02.

 

[robertyoke]

IMO, a supercharged 6.2L GM Gen IV smallblock would be awesome, IF and only IF it was mated to the 6 spd 6L80E or 6 spd allison transmission. The 6.0's and varients don't get near as good of mileage as you'd hope, and they don't tow as well as the 8.1Ls did, but they do tow better than the 5.3 and IMO the Ford 5.4's do.

I've seriously considered this as well since I really don't want the headache and extra costs associated with the diesels and I can't get a big block in a GM 3/4 or 1-ton truck anymore.

I wouldnt expect very good mileage with it, but it'll tow whatever you put behind it and will be about a buck a gallon less to fill up than a diesel, be way cheaper to fix, buying a 6.0 or 6.2 and supercharing it will still cost you $5,000 less than buying a diesel up front .... and .... you never have to worry about it not starting when its cold.

My $0.02.

yea, something aint adding up right here.....

buy a similar equiped truck with gas motor and diesel and then add cost for blower kit/install and you wont have 5k left over.

right now gas 85 octane was 3.85 and diesel was 3.95. run a blower and probably not going to get by with 85 maybe 87/88/89 but i'm guessing 91 and that was 4.05

and any on the new cr diesels will start way down in -30's no problem

 

[skibreeze]

I have only driven my diesel 5k miles, but I can say w/o any doubt that I hope to never have a gas truck again for towing my trailers. Granted, I don't have to drive the truck as a daily driver, but I love my new truck when it comes to effortless towing and I'm getting 2 mpg better mileage.

 

[Chubbydog]

I'm done worrying about the gas mileage in the diesel. I bought it, because I drove it, and fell in love with the power. I bought my Hyundai for gas mileage. If you drive a diesel, then go drive a gas truck I can promise you that if you have the option to buy the diesel, you will be. Most of the newer diesels cost between 30k, and 60k anyways, and If your worried about an extra $10 to fill it up every time, maybe you shouldn't be driving it in the first place.

It's like taking a Vette, and a Caviler to the race track. Sure both will get you around the track, but one will be a whole lof funner doing so, and get you there quite a bit faster.

 

[Dogmeat]

yea, something aint adding up right here.....

buy a similar equiped truck with gas motor and diesel and then add cost for blower kit/install and you wont have 5k left over.

right now gas 85 octane was 3.85 and diesel was 3.95. run a blower and probably not going to get by with 85 maybe 87/88/89 but i'm guessing 91 and that was 4.05

and any on the new cr diesels will start way down in -30's no problem

I thought diesel was over $4.50 a gallon right now .... typically its been $0.75 to $1.00 more than regular 85 octane the last 5-6 years from what I've seen you ... IDK, a diesel is nearly $10,000 more in up front cost than a gas vehicle and you can typically put a vortech or ATI procharger on a GM truck for around $5,000 .... so its gonna cost you less to supercharge the Gm small block vs. buying diesel any way you look at it, assuming you can handle the install yourself .... which with an ATI procharger isnt bad at all since you dont even have to tap the oil line ..

IDK, it might not pan out quite how I thought if you dont do the install yourself

IDK, a diesel is gonna cost

 

[mike_s]

I thought diesel was over $4.50 a gallon right now .... typically its been $0.75 to $1.00 more than regular 85 octane the last 5-6 years from what I've seen you ... IDK, a diesel is nearly $10,000 more in up front cost than a gas vehicle and you can typically put a vortech or ATI procharger on a GM truck for around $5,000 .... so its gonna cost you less to supercharge the Gm small block vs. buying diesel any way you look at it, assuming you can handle the install yourself .... which with an ATI procharger isnt bad at all since you dont even have to tap the oil line ..

IDK, it might not pan out quite how I thought if you dont do the install yourself

IDK, a diesel is gonna cost

Just keep in mind, once you apply forced induction to a gasser, you will no longer be running on 85 octane fuel. You'll be running 91 octane premium at nearly the same cost as diesel and getting the same or less mileage.

 

[Mafesto]

That is true.

Also, resale. People are about as eager to by that SC gas truck as they are a turboed XP....good luck giving it away!

Also longevity.
You likely won't get 1/2 the life from that engine that you would from a diesel.

Add to that, no warranty.

 

[Dogmeat]

They just need to bring the 8.1L back

Thats all there is to it

 

[Mafesto]

They just need to bring the 8.1L back

Thats all there is to it

No kidding.
Had that motor been kept in the line up & kept current mated with an efficient tranny it would be the ultimate gasser!

 

[milehighassassin]

I don't think it would pass current emissions and fuel economy requirements.

Great motor but lots of people getting rid of them because of fuel economy was horrible.


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[Blk88GT]

Don't forget that towing with a centrifugal supercharger is still going to require some RPM to make boost. The engine longevity isn't even on the same page as the diesel.

If you're dead set on towing with a gas truck, your best option is big cubes. IMHO.

 

[Jaynelson]

Engine longevitiy on any newer ish vehicle really isn't a concern diesel or gas....Wouldn't really use that as a point of comparison.

 

[Dogmeat]

No kidding.
Had that motor been kept in the line up & kept current mated with an efficient tranny it would be the ultimate gasser!

I think it does really well with the 5-spd Allison, but the 6-spd would be even better for sure.