Low Speed Pre-Ignition (LSPI) - Tune Updates For The 86 Platform

As an update to all our Delicious Tuning Forced Induction (Flash & Go) customers, including Edelbrock, Jackson Racing, JDL Turbo Kit, Speed By Design, to name a few. We are now implementing LSPI adjustments in all our tunes since November 2019, which includes version 28.50 and higher.

A short education post on what we have been spending a LOT of time on (within our tunes) over the better part of the last year in order to remove LSPI issues. We worked with other professional tuners, motor oil companies, and even vehicle manufacturers to understand what the issues are and how to best mitigate this issue while maintaining power and response even on 91 octane fuels.

You may ask what is LSPI. Low Speed Pre-Ignition (LSPI)
This trait is inherent on high compression, forced induction, direct injected engines, such as the BRZ (with forced induction) and 2015+ WRX, that can cause the combustion to pre-ignite at low RPM's and high loads. Here is a good article on what the issues are and what we are trying address in tune, along with other physical changes.


We have found a few key items within the tune to mitigate this issue while offering safety, drivability and power for daily commuters. Some other things to watch are the oil that you are using in your engine. Cars that are prone to LSPI, please make sure you are using an oil that is SN PLUS rated. Make sure to speak to your tuner about LSPI and how to best mitigate these issues through the type of oil you use, adjustments within the tune and even the brand of fuel you use. FYI: LSPI does NOT impact naturally aspirated vehicles.

How Lugging Will Destroy Your Engine (Video)
"Low speed pre-ignition (LSPI) is considered a serious problem for turbocharged small displacement direct injection engines. It is becoming more common as manufacturers continue to increase the stress being put on these engines by reducing displacement, increasing pressure and ignition timing to meet the ever more demanding fuel economy and emissions standards."


William Knose
Pushing The Boundaries Since 1999