![]() If an upgraded aftermarket turbo is installed, both fuel injector and fuel pump upgrades are required. An upgraded fuel pump like DW 65c or a Walbro 255 LPH HP will achieve safe power levels and injector operating conditions. Ideally the OEM injectors should be operated no higher than 90% duty cycle level. When this happens the fuel injector can be damaged (stick open or closed), and/or erratic fueling can possibly occur. With the normal bolt on modifications (3” turbo back exhaust, intake, intercooler, etc) and the OEM turbo in place the OEM injectors can easily go static, or reach close to 100% operating duty cycle. Fuel Pump UpgradeĪt a minimum an upgraded fuel pump is HIGHLY suggested before a custom tune is done. Alternatively, if you are being tuned in Speed Density (no MAF sensor) a vent to atmosphere blow off valve can be used since the MAF sensor is no longer present to monitor any airflow lost in the system when it opens. If an aftermarket blow off valve is desired, we suggest recirculating it back into the intake like the OEM one. With stock turbos or drop in turbo applications staying below 22-24 psi level the factory blow off valves do not need to be replaced. ![]() The factory blow off valves are designed fairly well. Vent to atmosphere blow off valves are popular and sound cool however, they increase the chances of stalling when coming to a stop and rich condition/back firing when lifting throttle. You will, however, lose power/spool from the leak so, from a power production standpoint it is in your best interest to make sure there are no leaks. Alternatively, when being tuned via Speed Density (MAF sensor gets ignored, MAP or pressure sensor is used) the system can have a leak and the car will still idle and drive normally. 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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