Effective Compression Ratio for P80 Engines

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Ryan — screen name callahanoffroad — did some math. What math? Why on this green Earth would someone do math outside of a school or a bank? Well, math to determine the maximum compression ratio for the three common 1993-2000 Volvo inline-5 cylinder engines. What he came up with is a lookup table that takes […]

How MAF Affects Idle, mpg and More

MVS Forums contributor and Volvo wizard jimmy57 explains how the mass airflow sensor affects the air/fuel ratio, idle, mpg and more and various Volvo models. On Bosch systems that is not really a MAP. It is used for boost pressure monitoring. The earlier extrapolation algorithm where MAF vs engine speed was used for boost level […]