Usefulness of Engine Logging

Myth: My engine is already in good condition so I will not benefit from logging

Fact: Logging still comes in handy for preventative maintenance. Here is an example of bad fuel timing that goes unnoticed in virtually all cases. The following charts show before/after fuel timing adjustment:

The fuel timing issue tends to deteriorate gradually (possibly over the course of several months) and drivers will not notice until the problem becomes severe. By logging we can do preventative maintenance at once. Optimal fuel timing contributes to better power and reduced emissions.

A similar case applies to the MAF sensor, which is another common deteriorating item in some engines. It slowly reduces power until it becomes weak enough for the driver to finally decide that something is wrong. This could be prevented early by logging.

Logging also assists in fine-tuning boost control and other engine parameters during custom tuning.


Here is a real-life diagnosis & solution of a stock car BEFORE tuning:

Boost Control

We found overboost in logs that the customer was not aware of. Adding performance with any tune or product will result in even more severe overboost, causing early turbo failure. The customer replaced the factory boost controller and boost hoses, which are normal wear items.

Boost Control

There's an apparent improvement, but it's still overboosting. Engine logs revealed that the N75 duty cycle was a lot higher than normal so the turbo actuator was adjusted to factory specs. See the next chart for the result. His turbo was a 6-month old factory replacement with an incorrectly set actuator!

Boost Control

Now his engine is optimized for longer turbo life and it's ready for a great tune. If minor overboost or underboost persists, they may be corrected in a custom tune.

We perform engine logging on all of our customers cars who purchased Malone Tuning Software stage 1 and up. For more details please Contact Us directly via email or phone.

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