VE Tuning Process

Volumetric Efficiency, referred to as VE for short, is a popular method of electronic air-fuel management that is widely used from the 90s to today, and what YOUR Mazda vehicle uses.

Since your motor at the end of the day is an air pump, when you put it under a load its efficiency changes with those loads and RPMS. 

Your car was tuned by Mazda engineers for how it was delivered from the factory, with its original intake, exhaust, and engine geometry. 

When you change any of those three things for instance, put on headers, or streetport your rotary engine, the volumetric efficiency can change.  To account for this the ECU must be adjusted to keep it from adding or subtracting fuel in its own which may cause an engine light or prevent monitor tests from passing. Or in large changes, like rotary porting it is needed to maximize performance since the ECU can only adjust up or down 25% of what the oem map.

Through a few sets of datalogging we can tune your car using it's sensors and  fuel trimming system to get within a few percent of accuracy. Altitude & temperature changes will effect this later but since it would be so accurate the computer will now  be able to adjust on its own and you won't notice a  wild change in performance. 

Since this process can sometimes take longer we charge just a little more and include this in the Full Custom Tune package. We recommend this for ported rotary engines, or people who want to maximize their performance & consistency. 

The image below shows the difference between the RX-8s oem Volumetric Efficiency map, compared to what it looks like now after bridgeporting.