How to get more horsepower out of a 6.2 Detroit diesel for free

The reason you would want to increase the fuel supply to an engine is to get more power. All engines need a combination of fuel and air in the right proportion to burn. A diesel engines throttle is controlled by the amount of fuel injected into the cylinder. A diesel does not throttle the air intake like a gas engine. This means that most of the time there is more then enough air in the cylinder during combustion on a correctly setup diesel. If your diesel has more then enough air available at full throttle that means that you could increase the fuel until the correct fuel air ratio is met and gain more power. If you modify the engine to breath better this would increase the available air allowing you to increase the fuel for more power. Typical ways to increase the available air would be installing a low restriction air filter, exhaust system, a turbo / supercharger and modifying the heads.. Obviously you have to do all of this and stay within the design limits of the engine. More power generates more heat and increased stress on the internal components. That's why the turbo diesels have high capacity water pumps, oil spray on the bottom of the pistons and a lower compression ratio.
I can now accelerate the same from a stop with a lot less pedal, and move out pretty quickly if I floor it. The second thing I noticed was hills, I now maintain speed on the ones that used to slow me down, and the ones that I used to maintain speed on I can now increase speed on. It's not as fast as turbo diesel, it is faster than a stock NA. I would say it feels like halfway between a stock NA and a stock TD. Not a tire burning muscle car by any means, but much better
Warning: Turning the fuel up on your engine will cause more internal heat that could melt your aluminum pistons. It is important that you be conservative with this adjustment
Build list
Wheels and mud tires
Front bumper
Paint bed
Lift kit
Install winch
Turn up fuel☑️
Time pump☑️
Upgrade steering
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[@herrprepper2070]

I bought a brand new 1984 GMC High Sierra K2500 J-code 6.2 off the lot. 300,000 miles later, I still use that truck as our livestock water hauler. (Rust-free Wyoming truck). Last year, I did my 2-year maintenance… Changed the AMSOIL synthetic engine oil and dual oil filters… drained, flushed, and refilled coolant… new glow plugs… new air filter… greased hubs… serviced drive train… also removed the stock, troublesome fuel filter and replaced with 90’s GM diesel van filter. I never dicked around with “performance” crap, because the stock engine is RELIABLE.

[@DumbCarGuy]

Best part about a slow truck is you get to see all the cool stuff go by you.

[@nathandehut9228]

Changing the rag joint and tie rods will help tremendously. With EVERYTHING

[@jlsgarage872]

I have a 92 obs with a 6.2, slow as hell but gets great mpg and easy as hell to work on

[@cherokeeronnie]

I love mine wouldn’t trade it for anything

[@dw7094]

In the 80's, I ran an Army DSU. My F&E (Fuel and Electric) guys were all GM trained on the Stanadyne DB2 fuel systems. They were wizards on injection systems. They tuned over a hundred CUCV and Humvee fuel systems. More power, no smoke and no negative impact on fuel economy. Most of their tuning was done on the vehicle, but they also had an injection test stand in their shop. The military used the "J" 6.2, so there was no EGR, only a CCDR valve. From the factory, all the CUCV engine injection pumps adjusted to the low end, as were the replacement pumps. The M998 pumps had a bit more fuel delivery due to weight of the vehicle.

[@brandondennison9152]

I like this build, would love to find one of these trucks!

[@RCBOSS1969]

Thank you!

[@bowhunting1013]

Hey Ronnie thanks for the video man, I found your videos when I just got my Lincoln 125 welder , learned a lot from you on that to , are you from East Tennessee? That place behind you looks familiar

[@cherokeeronnie]

No from wv

[@northernforever818]

Spark plugs in a diesel, woah!

[@MrMan5014]

I knew a guy who advanced the pump timing on his 6.2 and he blew it up!..you can advance the timing but don’t get greedy…1-2 degrees BTDC is fine…maybe even 3 degrees…the guy I knew had his close to 10 degrees and he would shove on it too!..KABOOM!..to put it in perspective, my 2001 Ram Cummins was 17 degrees BTDC…and that’s why those 24 valves rattle so much!…the more you advance them the lousy they get…the more you retard the the quieter they get!

[@martinblount5351]

Everyone says the 6.2 is slow and can't keep up. On a hill yes it won't go any faster but it won't slow down either Flat ground my 155hp 6.2 will go 100mph. Just don't get stuck below the torque on the hills and you will be ok

[@danwilliams8951]

what exhaust system do you have

[@MisterFuturtastic]

What is your exhaust system in this?

[@carbie5614]

What do you think about plugging the vacuum on the egr in the air cleaner and the manifold? i did in my 6,2 and I get NO black smoke when going up a hill, it used to smoke Black smoke a lot going uphill.

[@markelrod814]

A properly running 6.2l will NOT have any black smoke coming from exhaust. Why would you want unused fuel escaping through the exhaust? That's amateur hour nonsense...

[@Wingnut353]

@@markelrod814 indeed the best mod you could do is grab a J series manifold ... its more open and doesn't have EGR still only 155HP though. It's enough on my M1009 though. It doesn't have black soot except a bit as RPM catch up to the throttle very slightly.

[@mr._gator1284]

I’ve got a 83 with a 1993 6.5 injection pump on it. I’ve got it turned up a 1/4 turn. Rolls hella coal. Egt’s are around 1,000 degrees Fahrenheit

[@cherokeeronnie]

What do you have to monitor it with

[@mr._gator1284]

@@cherokeeronnie glow shift EGT gauge

[@celloprof]

Dont know what you people are talkng about, my dads old non turbo 6.2 diesel g20 van had tons of power. Here was the recipe, not limited to this order... #1. Dual exhaust, his was 2" dual #2. EGR DELETE! Take that thing from the middle of the intake manifold out, plug it up, get rid of it in whatever way you can! #3. Like the video says... turn up the fuel pump. I think my dad turned it up 1/4 of a turn? It could have been 1/8, think it was 1/4. got 22 MPG in the city, then got totalled out, no highway mpg, oh well... anyways. #4. K&N air filter, Just put it on, its not going to destroy your engine, lol. Its does more than you all know. Even in my g20 5.7l v8, seriously! #5. Took out the crappy 3.42 and put in a 4.11 ring and pinion gear. #6. Optional, BUT!!!!!!!!!!! My dad balanced the pistons and rods himself, the heaviest to the lightest in weight was a whole entire handfull of shaved metal. All 6.2 diesels are different, but that made it run better, quieter faster. 7. Raptor transmissions are good also, nice and locking in each gear. It had absolutely TONS of power, TONS, equivalent to my 93' g20 5.7L tbi v8 3.73 rear gear which stock is 200hp with 300Ft pounds of torque, we sort of raced for 1 or 200 feet! My current 6.5 with the db2 setup is slow, which is why Im watching this video, lol to remind myself, its probably a tight transmission, could be out of time, but with the 2nd db2 also... out of time also?

[@Sky_vulpes]

How do you know if this has already been done to a truck i just picked one up with 119000 miles on it

[@jacobfleming565]

Use your brain

[@Sky_vulpes]

​@jacobfleming565 nah I don't think I will

[@Elandycamino]

I'll be damned I got a 00 Cherokee and A 82 K20 6.2l

[@wilhelmvo6399]

Can these motors be turbo'd

[@jacoblemburg7736]

Yes use 6.5 intake/exhaust manifolds

[@Wingnut353]

More likely to blow up past 10psi... you at a minimum need head studs, preferably a crank girdle and a fluidamper installed since the stock damper is shot by now.

[@jbremer29]

BMI commander 6200 turbo retrofit kit

[@tomjaster309]

​@@Wingnut353you don't need head studs or a crank girdle to turbo one of these engines. A buddy of mine runs 25 psi on stock head and main bolts no issues and the engine has 340000 miles on it. I run a maxed out injection pump and 35 to 40 psi on stock main bolt with head studs also no issues.

[@gregsnyder4496]

Tell me more about

[@Wingnut353]

Rolling coal is wasting good fuel.... and the 6.2 doesn' make any more power if you do so. There are well documented mods to get a little more HP out of them, J code manifolds, turboing with head studs, crank girdle, and fluiddamper... it takes a lot of money to get power out of a 6.2 you are better of letting it run efficiently at near stock settings so it will last a long time rather than trying to make it do something it wasn't designed for.

[@cherokeeronnie]

Well I got tones more power out of mine

[@markelrod814]

6.2l J series shouldn't have any black smoke coming from exhaust. Intentionally dumping more fuel through the system than the engine can burn is moronic...

[@mblake0420]

Just bc it's black doesn't mean it's not making more power. Sure black smoke is unburned fuel however it's still burning more, game of diminishing returns.

[@misstransgender]

quit talking stsrt showing

[@cherokeeronnie]

Quit commenting and watch the video

[@danielkingery2894]

​@@cherokeeronnieNGL....funniest shit i read in comments today.😂

[@JamieTransNyc]

I agreee... less talk, more demonstration. Otherwise why make a video