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View Full Version : Is the Duramax 7.8 215hp enough juice for a GMC 6500?


syzer
06-08-2009, 12:47 AM
I need a new truck like yesterday, and I finally found what I am looking for. Problem is the truck has a 215 hp duramax. I dont have or know anyone who has experience with the duramax.

It would seem to me that 215 hp on a 26k gvw truck would be a bit underpowered if I had a full load and a skidder in tow?

Can anyone with experience with this engine let me know what your experiences are?

Thanks ahead!

JDiepstra
06-08-2009, 12:52 AM
What is the torque. I used to drive a Mack w only 300 hp but it had 1000 torque. Torque and gearing will be doing all of your work, not horsepower.

syzer
06-08-2009, 01:03 AM
Torque is 560

Gravel Rat
06-08-2009, 01:14 AM
I wouldn't consider a light duty medium duty truck with a 7.8 engine underpowered. For one its probably rated low because it has light axles.

A truck with a 26,000lb gvw is useless when it comes to trying to haul a decent load.

The 215hp 7.8 engine has 560 ft lbs at 1400 rpm which is pretty measly when you look at the International 466 has more power.

Looking Good Lawn Service
06-08-2009, 01:25 AM
It should be fine, you dont need alot of power in a cdl beater,...most of ryders trucks that are under cdl are 195hp,lol...get a 250hp and you will have more than enough pep for that truck. they put that same hp in most 33 gvw's anyways.

nosparkplugs
06-08-2009, 01:30 AM
Hell the same Duramax in a 3/4 or 1 ton truck has more HP/torque, the Duramax in the 6500's 215hp rating is the OEM ECU/ECM tune/flash, to extend the life of the Duramax in this application, you can turn the wick buy slapping a programmer on the Duramax, but it will shorten the life of the engine. It will get the job done, but their are higher torque diesel engine options in a 6500, that of course costs more MONEY



I need a new truck like yesterday, and I finally found what I am looking for. Problem is the truck has a 215 hp duramax. I dont have or know anyone who has experience with the duramax.

It would seem to me that 215 hp on a 26k gvw truck would be a bit underpowered if I had a full load and a skidder in tow?

Can anyone with experience with this engine let me know what your experiences are?

Thanks ahead!

Gravel Rat
06-08-2009, 01:39 AM
The 7.8 does have ratings to 260hp or something like that and 860 ftlbs but I imagine that is emergency vehical rating.

mag360
06-08-2009, 01:29 PM
Hell the same Duramax in a 3/4 or 1 ton truck has more HP/torque, the Duramax in the 6500's 215hp rating is the OEM ECU/ECM tune/flash, to extend the life of the Duramax in this application, you can turn the wick buy slapping a programmer on the Duramax, but it will shorten the life of the engine. It will get the job done, but their are higher torque diesel engine options in a 6500, that of course costs more MONEY

The 7.8 duramax in the 6500's is an inline six (to the best of my knowledge). Much better than the 6.6

Gravel Rat
06-08-2009, 02:14 PM
The 7.8 Duramax is a full Isuzu engine it has nothing to really do with GM.

FYS777
06-08-2009, 07:27 PM
The 7.8 duramax in the 6500's is an inline six (to the best of my knowledge). Much better than the 6.6

OOOOO skip the duro, g0 CUMMINS...........:weightlifter::weightlifter::weightlifter::weightlifter::weightlifter::weightlifte r::weightlifter::weightlifter::weightlifter::weightlifter::weightlifter::weightlifter::weightlifter:

syzer
06-08-2009, 09:22 PM
Thanks for the input. Problem is that I have a very limited base. I need a truck NOW, I tried to order one through GM and it will be september before the truck will arrive, october to be finished.

My only shot is a used one, and they are HARD to come by in a 4 door 26k gvw =(.

eaglescout1993
03-31-2010, 11:15 PM
I know you have already bought used broke in and all but if i were to get a truck that big i would go ford f-750 crew cab with dump and put air bags on the back to it can hold a load and not sag. thats just me and what i like. oh, and with a Cummins diesel in it.

tnmtn
04-01-2010, 03:54 PM
that engine should have plenty of power for that truck. for one you location shows as maryland. not too many major grades to worry about pulling. is it auto, 6 or 5x2 speed. i run a C65 chevy with a gas engine. not near the same torque but yet in low gear it will climb anything with a load. not very fast but the work gets done. you should be fine.
good luck

IndianSprings
04-01-2010, 10:54 PM
Extremely reliable and durable engine, plenty of power for that set up. The gearing makes a huge difference. For years we ran grain trucks with chevy 292 inline six cylinders, plenty of torque to haul loads of soybeans or corn.
18' grainbeds, some of our current grain haulers have 350 chevy's again plenty of power with the gearing. That duramax/isuzu will be all you need unless you plan on hauling over 16-18 ton on a regular basis.

P.Services
04-01-2010, 11:01 PM
hey guys sorry to inform you but this thread is almost a year old!!!!!!!!!!

and he allready owns the truck (it happens to be the nicest dump i have EVER seen also, i believe lawnsite members voted on that honor also)

360ci
04-01-2010, 11:52 PM
Doh! .