Lexus afm

[cre]

Yes, this has all been covered before.

No model of the MKIII had a MAF. 7M-GE had a VAF and 7M-GTE had a KVAF meter.

While anything other than a MAP (or speed/density) setup will always impose some degree of restriction the KVAFM isn't much worse than a medium size GM MAF. Between the Supra and Lex KVAFM housing yes, the Lex would be preferable.

Yes, you could use an SAFC or other fuel control piggyback but there are some serious concerns which accompany such a setup such as the significant offset in ignition timing maps. As you'll probably be wanting some different cams too a more advanced ignition timing control would be a good idea anyway.

Standalone is your best solution. Second is a solution such as the MAFT Pro or a combination of piggyback devices which offer fuel, spark and boost control. Something with closed loop and open loop A/F tracking/correction is a good idea. Something which supports speed/density would be nice but the piggyback solutions are quite temperamental whereas a massive GM MAF has very little restriction, is easy to find and requires a little less initial tuning to get it to play nice with the stock ECU. Read up on any system you consider, they've all got their little caveats here and there... For example the MAFT-Pro cannot be used as a boost controller is you are using any type of air flow metering other than speed density; The developer has spoken periodically about hybridizing the system so MAF users could also run a MAP sensor for boost control... but I haven't checked in to see if that ever made it beyond the suggestion box.