Well, buddy, I have had HHO on my 92 SC400 for 9 months. You are doing the most difficult car on the market to do. I worked on my HHO stuff and did my sc first, every other car I have done since has been a cake walk. First thing you want to know is you are going to have to custom make your HHO cells and place them infront of your radiator. Second you will wire power for your cells through your ignitors, see a wiring diagram to determine which line is the 12 volt supply line. You want to do the dual line modification to your last cell and place one line to the air intake and the other on a vacuum line. You will not be able to use a MAF/MAP enhancer! You want to check to see what kind of MAF your lexus has. 90-95 have the Karmen-Vortex MAF sensor. This is the most difficult to wire around. I am currently looking for someone with an electronics background to do one because unlike most sensors that work on signal strength, the Karmen-Vortex sends a metered band width signal( 5 volt square wave signal that varies in frequency) to the ECU. The closer the band widths are the higher the signal. Soooooooooooooooooooo, just leave it alone. Get a duel E.F.I.E. (they are about $150.00 on ebay) and wire it into the two O2 sensors that are before the Catalytic Converter. Take your time and have a excellent wiring diagram to link into the sensor signal from the O2 sensors and the ECU. I would also recomend the fuel heater and the PCV enhancer. I also use pure napthalene (you can find month ball made of pure napthalene but it must be pure, 1 moth ball per 5 gallons of gas or you run the risk of affecting the lubrication of the cylinder) to increase octane so I can run on regular gas. It will take you about a week to dial in your E.F.I.E. properly so take you time. YOu will be happy with the results and if you find someone to figure out how to take the MAF/MAP enhancer or the E.F.I.E Enhancer to work on the type of signal or the Karmen-Vortex MAF, PLEASE let me know!
I am hoping to find a by-pass to the Karmen-Vortex to increase milage per gallon. For those of you doubters, I took a 1999 Honda Accord LX from 23 mpg to 38mpg city driving and 27mpg to 44mpg highway! The NEW Honda Hybrids only get 33 mpg! This technology has been around for 50 years and has been supressed in favor of corporate profits. By the way, you think gas is back under control, you are wrong! Gas prices have fallen only to mask that EXXON/ MOBIL posted the highest profits of any corporation in HISTORY in there 3rd Quarter reports. When the attention is divered gas will be back at its former ridiculious prices.
T.C.