These engine modifications apply to the 325I 2.5 liter motor. The 2.7 liter “e” motor does not really lend itself to much in the way of gains, but most of these modifications also work on the “e” motor. Performance Engine Chip- Simple, effective and inexpensive Free Flow Air Filter and Heat Shield - This is an effective and simple modification.
Not much good without a heat shield. Larger Air Flow Meter - Very effective. The 3.5 liter air flow meter is much larger than the 325I meter. It can be used directly. However, most cars will not idle very well useless you replace the board in the 3.5 unit with the board from your 2.5 liter. Buy a new meter to throttle body rubber boot, warm up the end and stretch it to fit the 3.5 unit. Higher Flow Injectors - Effective with other mods. Actually this is an important addition if you have substantially increased HP. Without more fuel the engine may tend to run lean at high rpm Adjustable Fuel Pressure Regulator - Effective. More HP means more fuel demand. Increasing the fuel pressure to the injectors means more flow for the same duty cycle.
Tags : air flow meter, fuel pressure regulator, m20 engine, adjustable fuel pressure, adjustable fuel pressure regulator, bmw e30, fuel demand, motor performance, rubber boot, heat shield, performance engine, duty cycle, throttle body, free flow, air filter
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