Quick Answer

Question What size is the stock turbo on a 12-valve Cummins?

The stock specs for a 12-valve Holset HX35 will vary from year to year and whether the truck was a manual or auto, but the compressor inducer will be between 54 and 56mm. While popular upgrades for common rail trucks range between 64 and 67mm, a hot street 12-valve 5.9 needs to be a bit smaller.

What turbo does a 12v Cummins have?

Holset Fixed Geometry Turbocharger

1st Gen 5.9L Cummins Years: 1989-1993
Compression Ratio: 17.0:1
Firing Order: 1-5-3-6-2-4
Fuel Injection: Bosch VE44 Mechanical injection pump, mechanical injectors, direct-chamber fuel injection
Turbocharger: Holset Fixed Geometry Turbocharger (VGT)

How much boost does a stock 12-valve Cummins have?

Stock you won’t see much more than 25psi. Depending on the turbo you currently have you don’t want to run above 32-35psi.

What size is a stock Cummins turbo?

Stock turbochargers usually have large exhaust housings, large-diameter turbine wheels, and smaller compressor-side inducers. For instance, an HX35 turbo from a 5.9L Cummins measures somewhere around 54/69/14, which means it has a 54mm-inducer compressor wheel, a 69mm-inducer turbine wheel, and a 14cm2 exhaust housing.

How much horsepower does a stock 12 valve Cummins have?

The Cummins 5.9-liter 6BT 12 valve has 230 HP, 440 lb-ft of torque, and a P7100 inline injection pump right out of the box. The 12-valve is also a popular engine swap choice, powering a slew of Jeep, rat rod, muscle car, and dragster projects.

How much HP can a HX35 support?

HX35 is good to around 300-400 hp, i turned mine in to a hybrid and it still is not enough.

What’s better 24v or 12v Cummins?

When it comes to serious power and performance the 12v 5.9 Cummins takes the win. These engines are known to hold up better at extreme power levels when compared to the 24v engines.

What will 4k governor springs do for my 12v Cummins?

The Industrial Injection 4000 Governor Spring Kit is by far the best modification you will ever do to your 12 valve Cummins engine. The factory governor generally will slowly start to defuel the engine around 2300-2400 rpm and drastically decrease performance and pulling power.

What is the best year for 12 valve Cummins?

1996-1998 has the best injection pumps (perhaps ignoring the 1989-1993 VE) and stronger automatics compared to earlier years. Look at the buyers guide section in the thread below. The 1998 12 valve trucks were only built in 1997.

How do I get more boost out of my 12v Cummins?

With your stock fueling you can push the turbo to more than 20psi. If you interupt the signal to the wastegate diaphram you should be able to get another 5-10 psi out of it. once you get there, then, yes the addition of fuel will result in more boost and more power.

How much HP can a stock 5.9 Cummins handle?

The 5.9L inline-six mill’s factory rotating assembly from ’89 to ’02 is capable of handling 800 hp (1,400 to 1,600 lb-ft of torque) without breaking a sweat, and is often pushed into four-digit territory before aftermarket rods become a consideration.

How much boost does a stock 5.9 Cummins make?

On 1998.5-2004 5.9L Cummins you will need to physically modify your wastegate to gain more turbo boost. Doing this without the Boost Fooler will result in check engine lights and codes set into the computer. Stock 98-04 trucks should generate 18-23psi of boost pressure stock (depending on year model).

Will a bigger turbo make more smoke?

A large turbo can cause black smoke. But that’s usually a case of too large to spool on the low end. Then when it lights it should clear up some smoke or all.

How much HP does a 63mm turbo add?

Spool Up, Towing, And All-Out Horsepower

Turbo Peak HP Injector Used
E.D. 63mm Billet S300 688 hp 100% over
Silver Bullet 62 664 hp 100% over
Killer B 648 hp 45% and 100% over
Holset Cheetah 638 hp 45% over

What turbo is on a 5.9 Cummins?

5.9L Cummins Stealth Series 64mm Turbo.

What year 5.9 Cummins is best?

1994-1998 2500 &amp
3500

As far as performance potential goes, it doesn’t get any better than the mechanical P7100 equipped versions of the 12-valve 5.9L Cummins. They’re simple, rock-solid reliable, and can easily tick off a half a million miles if properly maintained.

Are 12 valve Cummins reliable?

The Cummins 12v/6BT is widely regarded as the best and most reliable diesel engine ever produced. These engines are extremely simplistic, operating with mostly mechanical components rather than complicated electronic ones. The simplicity allows for massive power potential in conjunction with ultimate reliability.

Why are 12v Cummins so good?

What made the Cummins so popular was the fact that its peak power and torque was insanely usable—in fact, the redline is only at 3,000 RPM! The 12-valve was able to get respectable fuel economy while producing torque figures never-before seen in an ordinary pickup truck.

How much boost does a HX35 make stock?

“The HX-35 and HY-35 turbochargers are rated for a maximum boost of 44 PSI.

How much HP can a HX40 support?

Registered. about 450, anything more and egts would be outta the safe range.

What flange is a HX35 Turbo?

Supercell Turbos – Turbo charger HX35 HX35W 3960478 T3 Flange 6BTZ Engines 5.9L.

How long will 5.9 Cummins last?

The Cummins brand is extremely reliable and prides itself on long-lasting engines. The 5.9-liter engine can expect to churn out 300,000 to 400,000 miles.

How much is a 12 valve Cummins engine worth?

A shop skilled in Cummins swaps will charge around $12,000 to $15,000 to take a 12-valve version with the 5R110.

Are 5.9 Cummins reliable?

Cummins 5.9 24v Reliability

Outside of the fuel system, the 5.9 24v is a very reliable engine. The engine internals such as the pistons, rod, and crankshaft will last a lifetime and can hold up beyond 500,000 miles.

How do you do governor springs on a 12 valve Cummins?

How to Install Governor Springs in a Cummins | Power Driven Diesel

What do 4K Gov springs do?

These governor springs will allow higher rpm and more power in your p-pump truck. For a 3K kit remove the center spring or leave it in for a 4K kit.

How do I install governor Springs?

How to Install Cummins Governor Springs

  1. Remove battery cable, horn, shutdown solenoid, and actuator arm.
  2. Remove old governor springs (Leave large outer spring in place)
  3. Install new governor springs (Install them as a single unit for ease)
  4. Repeat for second set of springs and reassemble engine parts.

What year did Dodge stop using the 12 valve?

However, in 1997, when Dodge and Cummins were gearing up for the transition to the all-new 24-valve 5.9L ISB set to be released midway through the ’98 model year, the remaining 12-valve engines were built using the 24-valve’s block and crankshaft.

How much does a 5.9 12 valve Cummins weigh?

How Much Does A 12 Valve Cummins Engine Weight?

Engine: Cummins 5.9L ISB (commonly referred to as the “24 valve”)
Horsepower: 235 – 325 hp @ 2,900 RPM
Torque: 460 – 610 lb-ft @ 1,600 RPM
Governed Speed: 3,200 RPM
Engine Weight: ~ 1,150 lbs, dry & dressed

When did they stop making 12v Cummins?

Cummins produced the 5.9L 12v Cummins for Ram pickup applications through the 1998 model year, where it was phased out in favor of a more emissions friendly 24 valve platform. The engine’s widespread applications include light and medium duty trucks, agricultural equipment, and construction machinery.