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While this covers installing a chip on the USDM version (US Domestic Market) Honda P28 ECM, the procedure is the same for almost all 1992-1995 (OBD-I) Civic and Integra ECMs. All of them use the same circuit construction. These include,…

What is it?   The Honda VTEC system is a dynamic valve timing adjustment system mounted on the engine head. It dynamically adjusts the exhaust valves’ timing using oil pressure. The ECM controls this oil pressure through a solenoid valve.…

What are those infamous IAT resistor mods and performance modules, and how do they compare with real EPROM performance chips? Need a guide to try it out yourself? Find out here.   Some background   The ECM can do a…

Performance chips: What are they?       EPROM Tuning Chips   The chips referred to when talking about performance chips are EPROM memory chips or Flash EPROM memory chips which contain a program for running the engine (inside the…

Recently, we have seen a new racing performance scam: the “regulator performance chip”.   What is this new type of “performance part”?   I have read some auction and sales pages listing a “Performance Module,” which is nothing more than…

Have you ever wondered what the Octane Rating of Gasoline is?   Every time we go to a gas pump to fill our car’s tank, we have the choice of which octane rating to use. More than a preference, your…

The following process will cover the DOHC engine of the 1993-1995 Honda Prelude (OBD-I)   1 – With the engine cold, remove the upper timing belt cover, the valve cover, the spark plugs, and the distributor cap.   The exhaust…