Description
VP Racing U4.4 REG is a leaded, oxygenated race fuel formulated for stock and modified two-stroke and four-stroke powersports engines. It is designed for riders and racers who are not restricted by fuel rules and want more power than pump gas can provide across a wide range of powersports applications.
U4.4 REG contains 7.5% oxygen and uses a higher-octane blend to support strong performance in both stock and modified engine combinations. It is a direct pour-in replacement for pump gas, but modest jetting or fuel-calibration changes are required to get the best results from its oxygenated formulation.
VP Racing positions U4.4 REG as one of the strongest performance upgrades available for the cost in powersports applications. It contains MTBE and is intended for off-road and competition use where permitted.
U4.4 REG is green for easy identification in the shop, trailer, and pits. It is available in 5-gallon pails.
Features and benefits
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Leaded, oxygenated powersports race fuel
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Designed for stock and modified two-stroke and four-stroke engines
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Contains 7.5% oxygen
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Direct pour-in replacement for pump gas
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Requires modest jetting or fuel-calibration changes
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Formulated to deliver more power than pump gas across a broad range of powersports applications
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Contains MTBE
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Green dye for easy fuel identification
Typical values
| Specification | Value |
|---|---|
| Color | Green |
| Specific gravity | 0.7626 |
| MON | 98 |
| RON | 114 |
| (R+M)/2 | 106 |
| Oxygen content | 7.50% |
| Oxidation stability | 1,440+ minutes |
| Leaded or unleaded | Leaded |
| RVP | 7.16 psi |
| Initial boiling point | 91.9°F |
| 10% distillation | 129.7°F |
| 50% distillation | 176.7°F |
| 90% distillation | 229.5°F |
| Final boiling point | 258.6°F |
| H:C ratio | 1.85 |
| O:C ratio | 0.07 |
| Stoichiometric air-fuel ratio | 13.12 |
Frequently asked questions
What is VP U4.4 REG fuel?
VP U4.4 REG is a leaded, 7.5% oxygenated race fuel designed for stock and modified two-stroke and four-stroke powersports engines. It is formulated to provide more power than pump gas when the engine is properly tuned.
Is U4.4 REG a direct replacement for pump gas?
Yes. U4.4 REG can be poured directly into a vehicle that uses pump gas. However, because it is oxygenated, modest jetting or fuel-calibration changes are required to maximize performance.
Does VP U4.4 REG require jetting changes?
Yes. VP recommends modest jetting changes because U4.4 REG contains 7.5% oxygen. Oxygenated fuel typically requires more fuel delivery than non-oxygenated pump gas.
What engines can use U4.4 REG?
U4.4 REG is designed for stock and modified two-stroke and four-stroke powersports engines. Always select and tune fuel based on the full engine combination, including compression ratio, engine modifications, intake system, elevation, and riding conditions.
Is U4.4 REG oxygenated?
Yes. U4.4 REG contains 7.5% oxygen. This added oxygen supports greater power potential but requires appropriate tuning.
Is VP U4.4 REG leaded?
Yes. U4.4 REG is a leaded race fuel. Confirm compatibility with your engine, fuel system, oxygen sensors, catalytic converter, and racing-class rules before use.
Does U4.4 REG contain MTBE?
Yes. VP U4.4 REG contains MTBE. Check local regulations before purchasing or using fuel containing MTBE.
What is the octane rating of VP U4.4 REG?
VP U4.4 REG has a 98 MON, 114 RON, and 106 (R+M)/2 octane rating.
Why is U4.4 REG green?
Green is VP Racing's dye designation for U4.4 REG. It helps riders and racers identify the fuel quickly and distinguish it from other VP Racing formulations. The dye does not affect fuel performance.
Is U4.4 REG street legal?
U4.4 REG is a leaded race fuel intended for off-road and competition use where permitted. Follow all applicable fuel, emissions, and racing regulations.