Having a sealed system after the MAF sensor is vital to do a proper tune. Alternatively a smoke test can be performed to visually find a boost leak, but we suggest the boost leak test up to 30-35 psi to verify all the couplers are tight and that there are no leaks on the intake manifold, blow off valve, etc. Boost Leak Testsīoost leak testing should be done before the tuning session. We recommend NGK Iridium spark plugs when possible, but strongly advised that you avoid brands such as Bosch, Auto Lite, etc. It’s not absolutely necessary to have a step colder plugs in for the tuning session, and they can be installed after the tune with no issues. The step colder than stock helps with pre ignition, which can lead to knock conditions. Colder Heat Range Spark Plugsįor basic bolt on modifications such as 3” turbo back exhaust, intake, and intercooler upgrades, one step colder spark plugs are suggested.
If race fuel or e85 is desired to be used for higher power levels, we do stock some VP racing fuels such as C85 and Q16 however, these might not be practical to use if not able to be sourced locally. It’s best to tune on the fuel that is available in your area to avoid potential knock conditions after a custom tune has been performed. We only have 93 within reasonable driving distance to the shop. If traveling to Evans Tuning to get a tune done, and the highest octane available in your area is 92 octane please bring extra fuel with you in 5 gallon containers. 18 Things You Should Know Before Tuning Your Subaruįuel octane should be 93 whenever possible, or use the highest fuel octane available locally to you.
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