Compound Twin Turbo fits Ford Cummins (Fummins) Conversion 1965-1998 Ford Truck Choose Turbos

Full twin turbo kit for Ford Cummins conversion (Fummins) includes both turbos (DPS S300 Turbo with a Borg Warner S400 Turbo). For Ford Truck models 1965-1998.

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Choose Cummins Year *
Ford Truck Year
Choose Large Turbo S400 (Atmospheric)
Choose Small Turbo (High Pressure Turbo)
Add a Downpipe
Add a DPS Shirt

$3,699.00

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COMPOUND TURBOS / TWIN TURBO KIT FOR FUMMINS (FORD CUMMINS CONVERSIONS FORD TRUCK YEARS 1998 AND OLDER)

Fits Ford Truck Years 1965 - 1998

DPS S300 over S400 Turbo Choose your Turbos.

A 360 DEGREE THRUST BEARING IS INCLUDED IN ALL DPS S300 BASED TURBOS

360 Degree Thrust Bearing Adds 65% more thrust load capacity, making your small turbo virtually "indestructible"

Race Compressor Housing flows 9% more air.

^{Full Compound Turbo Kit Includes Everything for Install}

This compound kit is the most user friendly kit to fit on your Ford pickup with the Cummins engine conversion. Made to clear your heater A/C core. Other features include:

High Flow 3-Piece Exhaust Manifold included in kit, with built in pre-tapped pyro ports.
The largest air filter on the market.
Low pressure charge pipe is silicone with Kevlar/Nomex liner (which is easier to fit than a steel tube). Silicone tubing uses fewer clamps and has better flow characteristics than steel.
High pressure charge pipe is strong chrome plated aluminum.
Small turbo is wategatee which flows more than similar a/r T4 flange non-gated turbos through exhaust
Cast hot pipe, not flimsy welded exhaust pipe.
Flexible Steel braided oil supply lines, and stainless steel oil drain lines.
Polished DPS (small) turbocharger.
S400 large turbo with your choice of compressor wheel, as atmospheric turbo
S400 Race Housing, with shrouded inlet, flows amazing, has elbow outlet allowing very good fit. This race housing with elbow outlet is unique to our kit, and allows it to fit the Fummins, or Chummins conversions.
Support bracket for Lower (large) turbocharger.
Adjustable boost pressure.
Intercooler hose to fit stock Ford intercoolers (depending on your truck choice).

Our Fummins Twin kits have many unique design characteristics like our S400 Race Compressor housing, with a tight elbos. Cast and machined hot pipe, special molded tubing, giving our kit alone the ability to fit into the complex Conversion Projects, including Ford/Cummins, Chevy/Cummins, and other Cummins conversion projects.

Our kits now come with two separate oil drain lines (except for 12V engines that only have one oil drain port, but we accomodate that as well).

Where else can you find a twin kit for your conversion. No where, but here. Even includes the intercooler hose to fit the Ford intercooler.

Diesel Power Source, Twin/Compound Turbo Kit, performs excellent when Racing, Towing, or Sled Pulling, but is very driveable. SPOOL UP IS SIMILAR TO STOCK on our smaller kits, while raising airflow significantly. You'll be amazed at the spool up, and driveability they get from such a high performance kit.

EGT's are typically reduced by 300-500 degrees, over a single turbocharger.

Boost pressure will typically exceed drive pressure, which can't typically be done with a single turbocharger (with a single turbo, drive pressure is typically about double boost pressure).

Horsepower, and torque are increased throughout the entire RPM band, and significantly increased in mid and upper range.

Specifically tuned for 350 - 1,300 horsepower applications.

Note: New model ford trucks may not fit our intercooler hose, due to a change in Ford's intercooler location.

This Twin/Compound Turbo Kit was designed on cutting edge CAD/CAM Software, using CFD (Computational Fluid Dynamics) Testing. You will not find a more high tech kit on the market today. Everything fits like it was built from the factory.

Kit includes: Air Filter, Cast Iron Hot Pipe, Support Bracket for S400 Turbo, 3-Piece Exhaust Manifold (pre-tapped ports for pyro), Complete Air Intake including Air Filter, Silicone Charge Pipe (on Low-pressure end), Chrome Plated Aluminum Charge Pipe, 1-DPS Turbo (small turbo, S300 Based),1-S400 Turbo (large turbo 75, 80 or 83mm Machined Billet compressor wheel/ 96m turbine wheel, 1.32 A/R Housing), 2-Steel Braided High Temp Oil Supply Lines, 2-Oil Drain Lines & Fittings, Turbo & Manifold Gaskets, Oil Line Adapters, Mounting Bolts, Exhaust Adapter (from S480 to exhaust pipe), V-Band Clamps, High Torque T-Bolt Clamps, Low Torque Clamps, Installation Instructions.

DPS Turbos are based on the S300 platform and/or S400 platform.

EGT TEST RESULTS: The following test results were to test different single turbochargers against our Twin Turbo Kit (this test was on our HT3B twin kit which has less air flow than the S400 series kits). Each test consisted of a sustained 400hp dyno pull. The test truck was brought up to a 400hp on the dyno, and then loaded to hold a sustained loaded pull, equal to pulling a trailer up a grade using 400 hp. The EGT's were read pre-turbo. The results follow:

Test 1 Stock Turbo: Max EGT's reached 1700 degrees, (Test Time: 13 seconds, operator ended test due to excessive EGT's).
Test 2 Competitors Stainless Steel Housing Turbo: Max EGT's reached 1700 deg (Test Time: 17 seconds, operator ended test due to excessive EGT's).
Test 3 Diesel Power Source Twin Turbos: Max EGT's reached 1290 (Test Time: 1 minute, EGT's did not ever exceed 1290 degrees).

Reasons Why Our Fummins Compound Turbos Work So Well

The air entering the cylinders is cooler, because dual compressors work together within their most efficient zone. The boost air is typically over 100 cooler than from a single turbo.
The air entering the cylinder is at higher pressure, bringing the boost pressure and exhaust drive pressures near a 1:1 ratio. The intake stroke can actually produce power.
There are additional air molecules in the cylinder which do not get involved in combustion which carry the heat out of the cylinder (similar to how a jet engine is cooled).
It has more complete combustion in the cylinders because there’s more air in the cylinder to burn all of the fuel.

**While a downpipe is not included in this kit, we do include a machined exhaust adapter/reducer which v-band clamps onto the exhaust outlet of the S400 turbo, so that a 4” or 5” exhaust pipe can be welded or v-band clamped onto it. This makes it very convenient to attach whatever exhaust system you have. We do offer a 2nd gen Dodge downpipe which will be close but made need adjustments to fit the Conversion projects.

** 1-Year, Limited Warranty.

Free shipping to the lower 48 states. When shipping to anywhere outside of the lower 48 states, additional shipping fees may apply.

Head Stud Recommendations:

2007.5-2012 Engines: Head studs if boost pressure over 50 PSI, Fire Rings over 55 PSI

2003-2007 Engines: Head studs if boost pressure over 55 PSI, Fire Rings over 65 PSI

1989-2002 Engines: Head studs if boost pressure over 48 PSI, Fire Rings over 55 PSI