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We will be swapping out my old PTE 1000cc low-z injectors for a set of new FIC 1200cc high-z injectors. So this won’t be a full how to since I didn't actually do the job myself, but this video should provide a few tips if you plan to swap injectors in your evo 8 or evo 9. And first you might be saying, well what is low-z vs high-z and how do I tell the differences and which is better? Well, the lowz or low impedance injectors are the older style of injector, more short and fat looking. High-z or High impedance injectors are a newer technology and look tall and skinny looking. And If you want more details than that on how they operate, I recommend doing a bit more research online.
On to the removal process… Removing the old PTE 1000cc low impedance injectors is pretty simple. First you’ll remove the retaining clips on each injector to release the plugs. Once all 4 wiring plugs are released you can move the wiring out of the way. Next, remove the bolts holding down the fuel rail. Once the fuel rail is free, you can remove your old injectors and seals.
These New FIC 1200cc injectors are a direct Plug & Play fit to the OEM harness. However,
If you decide to run high-z injectors in your evo 8 or 9, you need to buy or make a resistor pack delete plug. The cost of a resistor pack delete plug is around $30 OR, the process of making one would involve cutting the plug off the oem resistor pack and soldering all 5 wires together. The resistor pack delete essentially removes the resistance by taking the 12volt wire and making it send all 12 volts to all 4 injector wires…. Hence the 5 total wires. I elected to buy the new plug and leave my old resistor pack in place. That way if I ever needed to go back to low-z injectors in a pinch, I could still make them work.
Another reason I made the switch to these 1200cc injectors is because of Injector Duty Cycle. Injector Duty Cycle (IDC) is a ratio between the pulse width required for a proper Air to fuel ratio and the length of time you have to inject that amount of fuel. Injector Duty Cycle is shown in a percentage. In the provided data sheet with my new injectors from FIC(fuel injector clinic) they recommend not exceeding a 90% Injector duty cycle. My old 1000 cc injectors were close being maxed out(100%) and sizing up to these 1200cc injectors will get me near or below that 90% IDC.
Onto the install process. It's actually pretty straight forward. A helpful tip is to put a little oil on the new seals so they slide in easily and don’t roll off of the injector. Then place all four injectors into your fuel rail first. Set it down as an assembly, lining up each injector into the intake manifold. Next, move your wiring harness back in place and plug in each injector and re-install the retaining clips. And finally, don’t forget to tighten down your fuel rail bolts.
Next on my fix list was changing out the Mass air flow sensor plugin. I purchased a used plugin a while ago when I noticed how bad mine looked. But since the car still ran fine, it took some extra motivation to actually get it fixed. Andy has plenty of re-wiring experience and all the proper tools, so this seemed like a good time to let him get the job done.
Once the new injectors were installed and the Mass air flow sensor plugin was re-wired, Andy changed the injector scaling to match the larger injectors and the car was moved onto his All wheel drive dyno. This again is where I let the professionals do their work as I try to learn what I can along the way. I filmed a couple dyno pulls using my cell phone on a gimbal for stability, but the noise and vibrations of the dyno really messed with the gimbals stabilization.
Disclaimer: This video is for entertainment purposes only! Perform anything you see in this video at your own risk. Due to factors beyond the control of this video creator, I cannot guarantee against improper use or unauthorized modifications of this information. Boosted Films assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. I recommend safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of Boosted Films, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not Boosted Films.