Fuel Saver Power Module

[LexKid630]

Is this thing just another one of those "modules" that won't work on a lexus? Any input is appreciated...

http://cgi.ebay.com/ebaymotors/Lexus-RX300...sspagenameZWDVW

[wwest]

Is this thing just another one of those "modules" that won't work on a lexus? Any input is appreciated...

http://cgi.ebay.com/ebaymotors/Lexus-RX300...sspagenameZWDVW

More HP/torque = improved FE...??

NOT...!!

Or maybe if your RX is underpowered to begin with....

NOT!

Or you drive like teenage "boy-racer" all the time.

The "scheme" is to modify the signal from the IAT section of the MAF/IAT, Mass Air Flow / Intake Air Temperature, sensor's signal such that the engine ECU "thinks" the intake airflow is colder/(therefore denser) than in actuality resulting in a richer mixture than otherwise.

The problem is that during idle or cruising at a constant speed the MAF/IAT signals are ignored for A/F mixture control in favor of the upstream, first, exhaust oxygen sensor. While the oxygen sensor is being used EXCLUSIVELY for A/F mixture control the engine ECU is continuously LEARNING the calibration parameters for the MAF/IAT signals. So once you ask for acceleration torque the device's (typically an inexpensive, 5 cents, 1/4 watt resistor) modified signal has already been "zeroed" out.

For this scheme to even have a chance of working the resistor should be out of the circuit during idle or cruise, when the MAF/IAT signals are being "calibrated", and only in the circuit when you ask for acceleration level torque. Off the top of my head the only way I know to do that is to disable the modifying resister if the TPS, Throttle Position Sensor, is at the idle position, OR the torque converter lockup clutch is NOT enaged AND the TPS is NOT at idle.

For most modern day automatic transmissions the torque converter lockup clutch will ALWAYS be engaged while cruising at a relatively constant speed.

Insofar as I can learn NONE of these systems on the market are that sophisticated in design.

WORTHLESS.

[LexKid630]

Thanks, i thought so too.