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HMMWV Performance Upgrade Package

HMMWV High Output Engine Upgrade

An improved and redesigned HMMWV engine based on the OEM HMMWV 6.5L that will drop-in and bolt-up to any HMMWV with no modification to the vehicle. Custom horsepower and torque range tailored to any unique application, terrain and operating environment. Up to 79% increase in horsepower and up to 60% increase in torque over the standard OEM HMMWV.

Features & Benefits

Engine will drop-inand bolt-up to any HMMWV with NO Modifications needed

Mechanical Fuel Injection (easier to repair and diagnose especially in a field environment)

10,000 hours Life Cycle before overhaul Compatible with existing spares inventory and most drive train components can be re-utilized Better fuel economy reduces fleet fuel logistics.

Engine Design Improvements High Strength Forged Steel Crankshaft Forged Carbonized Steel Camshaft Cross Section Forged Steel Connecting Rods Grey Iron/Molybdenum.

Engine Block Increased Cylinder Wall Thickness Increased Crank Journal Depth Grey Iron With High Chrome Content.

Cylinder Heads Higher Turbo Boost Pressure With Improved Flow Outlet Cast Aluminum Intake Manifold Cast Nodular Iron Exhaust Manifolds.

New Cast Alloy Structural Oil Pan Increased Horsepower to 250hp at 3000 RPM 32% increase in horsepower over standard OEM 6.5L engine 79% increase in horsepower over standard OEM 6.2L engine

Increased Torque to 550 lbft at 2000 RPM
45% increase in horsepower over standard OEM 6.5L engine
60% increase in horsepower over standard OEM 6.2L engine

Transmission Upgrade

The HMMWV 4L85E Transmission has proven reliability for nearly 2 decades and it is recommended due to the increase in engine power. The benefit of an additional gear increases fuel economy and vehicle flexibility.

Features & Benefits

Proven reliability for nearly 2 decades

Close ration gears:
- First: 2.48
- Second: 1.48
- Third: 1.0
- Fourth: 0.75
- Reverse: 2.07

885 lb. ft. maximum gear box torque rating
18,000 lb. maximum GVW rating
22,000 lb. maximum towing capacity

HMMWV 6.2L FLEETS

It is recommended to upgrade the transmission to the venerable 4L85E as offered with the H.O. power pack due to the increase in power and the benefit of an additional gear, this increases fuel economy at road speeds and vehicle flexibility.

HMMWV Push-Button Shift Upgrade

This HMMWV upgrade provides simplicity with the push of a button to automatically select the right gear, preventing shifting errors and reducing maintenance. The compact design increases cabin space and is compatible with existing transfer cases.

Features & Benefits

Provides simplicity with automatic correct selection of gear, preventing shifting errors thus reducing maintenance
Shift-On-The-Fly transfer case range selection protects the transmission and engine when shifting into Low Lock
Compatible with existing transmissions and transfer cases
Compact design increases cabin space
Improves survivability by eliminating gaps in the armor from traditional cable shifters (Standard HMMWV has hole in floor at shifter location)

HMMWV Cooling Pack Upgrade

Designed for extreme conditions, towing and heavy loads. This HMMWV redesigned and improved cooling system ensures optimal performance in the harshest and hottest environments up to 145ºF (62ºC). Testing has shown overall engine temperature to be 30º cooler providing more durability and reliability of the engine and drive train components.

Features & Benefits

A redesigned and improved cooling system to ensure optimal performance in the harshest and hottest environments up to 145ºF (62ºC)
Includes the radiator, engine oil cooler, transmission cooler and power steering cooler

Power and Performance
Fuel economy
Durability and reliability of the engine and drive train components

Incorporated an air charge/intercooler to this system for increased:
Power and Performance
Fuel economy
Durability and reliability of the engine and drive train components
Coolers are based on a lighter aluminum structure of plate & bar design considered the most durable in the industry. (Standard HMMWVs are copper and brass)
Improves survivability by eliminating gaps in the armor from traditional cable shifters (Standard HMMWV has hole in floor at shifter location)
Testing has shown: Overall engine temperature is 30º Cooler Transmission temperature is 15% Cooler Oil temperature is 20º Cooler

PATENT No. 8,752,522

HMMWV Suspension System Upgrade

Ride faster, smoother and travel safer over any terrain. The upgraded suspension monitors everything and reacts accordingly minimizing damage to vehicle and parts. The system detects weight loads, acceleration direction, height and compensates automatically to prevent bottom out or top out - long before it happens.

Features & Benefits

Traditional passive shocks are “programmed” with one set of responses you must choose between a “good ride” and “good handling”

• With hmmwv passive shocks They only respond to the relative velocity between the chassis and the wheel. The faster they move, the stiffer they get! A passive shock has “no idea” if the chassis is moving or the wheel is moving.

• An enormous compromise must be made

This means damping is usually too stiff for a best ride and too soft for best handling. Each shock acts independently and has “no idea” what the “other” shocks are doing. Or, if the body is rolling, pitching, diving, squatting, heaving or yawing.

Unlike a passive suspension…

The Extreme Suspension System monitors EVERYTHING and REACTS accordingly!

• It knows: If the chassis is moving and in which direction (pitching, diving, squatting, heaving, cornering or yawing) How fast, and its acceleration rates at EACH corner and in all 3 directions its absolute position at all times To prevent bottom out or top out on each wheel – long before it happens!

• In addition, it: Mminimizes damage to vehicle and parts Can detect extra loads by measuring average ride height and compensate automatically Prevents driver and passenger fatigue

Ride faster, smoother and travel safer over any terrain.

HMMWV High Engine

HMMWV High Output Engine Upgrade

USEP HMMWV Performance Upgrade Package produced and manufactured by US Engine Production Inc