Josh McClain's personal blog

Many of you probably know of the fuel/timing issues with the TRD supercharger kits, especially for the 3.4L 5VZFE. Well, this is the setup in my 97 Tacoma 4wd 5spd. In the winter, it’s pretty easy to drive around all the load/rpm sites that ping, clearly indicating a timing advance problem in addition to the known under-fueling issues. But with the onset of Spring and upcoming Summer – which I’m not eager to drive it ever so cautiously this year – ping happens everywhere. So it’s time to fix it once and for all. Stock injectors are 238cc/min! And TRD [USA] decided no upgrade was necessary for a supercharger (Eaton M62) putting out 8 psi. Additionally, there’s no pump upgrade, timing mods nothing. So here’s the plan: - 440cc injectors from a 7MGTE, which is why I’m in search of a used resistor pack. The 5VZFE ecu expects high Z. - Walbro 190 lph. I’m only going for maybe 350hp. Maybe the 255 will be needed who knows. - MAP ECU2 piggyback. I really couldn’t justify an SMC or SM4 for this truck, even with my dealer discount. So we’ll give this ECU2 a go the JZA80 guys seem to be in love with it here in the USA. Also, due to my crazy altitude changes on even short (30 minute) trips, I’m using an external MAP sensor to watch MAP, and will let the internal MAP sensor monitor baro. This ecu also has an O2 sensor override function, which will let me trick the ecu into open loop at will. - Exhaust – undecided at this point. Probably a test-pipe and catback for now. - The stock MAF will go to the shelf, since this is a speed-density system. - There’s no intercooler in this setup, unlike the Lightning’s w/a sandwich system. So I may modify the intake to accept water injection maybe direct port. After all this is done, I should be able to get away with a 12 psi pulley. Should be a nice DD.