This weekend the Tacoma finally felt some lovin’.
She had her supercharger snout bearings replaced, spark plugs replaced, and a new override brain installed.
Ok, I’ll stop calling it “herâ€.
For quite a while now … ok months … there’s been this awful, howling noise coming from the engine bay, and it is directly related to RPM. I rev up, its pitch goes up; down, down. So after some listening up close, I decided this 174,000-mile engine needed some help. (Remember, I bought this truck at just over 105,000 miles, and the Gen I supercharger was already in place. For all I know, it had been on there since day 1; the dealer who sold it to me didn’t know.)
So I ordered a bearing kit, with a new seal, and supercharger oil. I replaced it all, made a dumb mistake that will require me to replace the outer snout seal [again], and put it all together. It runs great and slightly quieter, but the noise is still there. I’m now suspecting the supercharger tensioner pulley is to blame. It’s so hard to tell exactly where the sound is coming from, but I’ll check with the various 5VZFE communities (Tacoma, 4Runner, T100), and see what they’ve experienced.
Since I had a free day today, I decided to also wire in the MAP ECU2, from http://www.mapecu.co.nz as well.
Other than the hot sun beating down on me while I made the connections to the oem ECU harness, everything was pretty painless. I soldered every joint, and heat shrinked where possible.
I have it wired and set for learning mode at the moment, so I can build a decent base map. I have an Innovate LM-1 wired for wideband AF logging (verified working) on O2 input primary, and will use the O2B circuit (MAF input, analog #1 output) for O2 correction. Once I’m done with Learning mode, I can put O2B input on the MAF input.
Once my 3-pin external MAP connector arrives, I’ll switch to an external MAP sensor (hopefully, this one I have from a 7mgte), and use the internal MAP sensor for baro adjustment. The IAT sensor I tapped into the stock intake tube, just pre-TB. It’s connected to the 2-pin connector hanging off the 16-way connector at the ECU2. I’ll be doing IAT correction.
I’ve verified I can adjust timing. I can’t wait to start tuning!
It wouldn’t start with the jumpers in the default positions, so I switched the drive jumper to HIGH, and she started right up.
I finally managed to source a used injector resister pack from a MkIII Supra Turbo to use the Supra 440/430cc injectors in my Tacoma. See, the Tacoma ECU’s injector drivers expect high impedance (resistance); for that matter, so does the Supra’s. So how does one use low impedance injectors, you ask? Use a resister pack!
And here she is. The seller even left the MAP sensor attached.