Meth INJECTION

Once you reach the full bolt on mod level and beyond and start pushing things these cars are on the verge of running out of fuel at high rpm. When they run out of fuel they get very angry very fast.  When an STi or old EJ WRX run out of fuel they will start gradually leaning out eventually knock whenever the EGT's get too hot.  However, the FA's have an immediate adverse reaction when the fuel limitation is reached.  This can result in misfires and or knock which can ultimately lead to engine failure in a single pull. This is also the main reason I don't tune catless cars because it is exactly what happens when cars boost creep at high rpm, the boost rises and the cars run out of fuel.  

if ethanol is not available in your area, then methanol injection is the next best solution to making power on these cars.  Methanol injection has the added benefits of increasing the octane, decreasing the intake manifold temperatures, and cleaning the valves. Increasing the octane and decreasing the intake manifold temperatures will both move you further away from the knock threshold and thus make the car safer while allowing you to make more power. So, if you're going to eventually spend $400 on a walnut blast to clean the valves, you might as well spend $500 on an AEM Meth kit and receive the added benefits.

Adding a meth injection kit requires a re-tune.  I recommend the AEM meth kit spraying a 50/50 mix of water and VP M1 with the medium nozzle (500cc).  Set the controller to start spraying at 10 psi and full at 14 psi. For a TMIC the nozzle is installed in the intercooler outlet tank (reference the Grimmspeed TMIC, it comes with a fitting already welded into the intercooler outlet).  For a FMIC, the nozzle should be installed in the intercooler pipe 6-8 inches before the throttle body. 

NOTES:

*  I do not like the Snow Performance kits.  The throttle body spacer nozzle holder does not work well.  The nozzle needs to be before the throttle, not after.  

*  AEM v3 nozzles are NOT compatible with 100% methanol.  A 50/50 water/meth mix must be used.

*  As of July 2021, AEM will no longer warranty their kits if a mix over 50/50 is used.

*  I do NOT recommend using Snow Performance Boost Juice, Devils Own Brew, or windshield wiper fluid.  None of these options provide consistent methanol percentages.  You can go on YouTube and watch multiple videos of customers testing these products for methanol content and getting values as low as 10% methanol when it's supposed to be 50%.  I would highly suggest sourcing pure methanol from VP and making your own 50/50 water/meth mixture.  This will ensure you truly have 50% methanol. 

AEM Meth Kit Part # 30-3300 (complete meth kit w/ wiring harness, all meth lines, 3 nozzle sizes, 200 psi pump, controller w/ 35 psi onboard MAP sensor, 1.15-gallon tank and a fluid level sensor, $500)

AEM Meth Kit Part # 30-3301 (complete meth kit w/ wiring harness, all meth lines, 3 nozzle sizes, 200 psi pump, controller w/ 40 psi onboard MAP sensor, 5-gallon tank and a fluid level sensor, $600) 

AEM Meth Solenoid Part# 30-3326 (REQUIRED - install close to nozzle to prevent siphoning into manifold)

AEM Inline Filter Part# 30-3003 (REQUIRED - keeps nozzle from getting clogged)

AEM v3 Nozzle Kit (Part # 30-3315, includes 1x 250cc, 1x 500cc and 1x 1,000cc nozzles - this does not need to be purchased, the nozzles come with the kit, it's simply for reference)

How to wire up a failsafe relay https://youtu.be/G6ywmIzRexE

Running pure meth is more dangerous than a 50/50 blend.  Pure methanol has a boiling point of 148 degrees, so it can boil off if you live somewhere extremely hot like Phoenix.  Due to safety concerns and AEM no longer making the v2 nozzles, I will be recommending a 50/50 mix from now on.

* AEM v2 nozzles are compatible with pure vpm5.  However, they are no longer in production.

ProMeth Nozzles - https://prometh.com/collections/nozzles/products/8-0-gph-63-cc-per-minute-water-methanol-injection-nozzle?variant=18900548911173

Before doing the logs start the car and put AF Correction1 and AF Learning1 on the AP gauge screen.  Press and hold the test button on the AEM controller for 5 seconds then let off, watch the Correction and Learning....if the meth is spraying one or both should go to -20 to -30%.  If this doesn't happen, stop here and don't do the logs.  It means the meth is spraying and you need to troubleshoot.  If the meth sprayed, then continue.  Set the start spray to 10 psi, full spray to 14 psi.  I don't recommend using boost juice.  It can have extremely low methanol content and basically be water.  You can search it YouTube and watch customers test it themselves and get like 10% methanol reading.  I recommend buying a 5-gallon jug of VP M1 methanol and mixing it yourself.