![]() ![]() Injectors in TBI kits typically cannot be upgraded to larger ones.They use injectors with very short minimum open times and fire them progressively. Many TBI kits will work on engines making 200-800 hp, or more. ![]() Using E85 or power adders with a compatible EFI kit will reduce the max horsepower rating.Always read the Instructions before purchasing an EFI kit to find details on the horsepower rating.When that’s the case, consider these guidelines: Maximum HP Rating Some manufacturers make it easy by giving a min-max range. Unfortunately, this range is often unavailable. The shorter this time is, the wider the min-max range will be. It’s based on the shortest amount of time an injector can be cycled while still having a good spray pattern. Minimum horsepower is harder to figure out. It boils down to how much fuel the injector supplies if it’s open all the time. The Calculation for Max Horsepower is straight forward. Fuel Injector Sizeįuel injectors are the main factor in both minimum and maximum horsepower rating of EFI systems. However, a Small Throttle Body will limit the max horsepower rating. In fact, most injectors are a similar size physically, though there tends to be more variation in throttle body injection injectors than in port injectors. A 1,000 cfm throttle body will work fine on an engine making 200 hp. Unlike a carburetor, EFI doesn’t need airflow to atomize fuel. Airflow Rate (CFM)ĬFM affects maximum horsepower but not minimum. Keep reading to learn what affects these ratings and how to pick the right kit for your motor. But what about the smallest engine a system can support? Choosing an EFI system that’s too big will result in poor idle and bad throttle response, same as a carburetor. EFI Kits are rated by the maximum horsepower they support with gasoline. ![]()
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January 2023
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