Lexus RX 500h F 2023–on Throttle Controller — Ultimate9 evcX X173

Both remove throttle lag on the same vehicles. The difference is the interface and the number of modes.

EVC — four modes: Ultimate (nine levels), Economy, Automatic and Factory. Twenty tuning settings. Takes a coloured faceplate, which we include free.

evcX — nine modes, adding Ultimate9, Anti-Slip, Launch, Valet and Lock-out. Bluetooth control through the Ultimate9 TC app, a self-dimming OLED display, dual USB-C ports and a driver interface that unplugs and comes out of the car. Faceplates do not fit the evcX.

If you want the simplest thing that fixes the lag, the EVC does it. If you want Launch and Anti-Slip, phone control, or the security of removing the interface and locking the throttle, that is the evcX.

One part number covers a lot of vehicles, so the list on this page is worth opening — if your car is named there, this is the correct unit.

Fitment is by drive-by-wire accelerator pedal, not by engine, so petrol and diesel versions of the same model usually take the same controller. Some models changed pedal connector partway through a generation, which is why the year range matters.

If your car is not listed, or you are between year ranges, send us the make, model, build date and body code and we will confirm the part number before you buy.

Every EVC comes with a white interface as standard. Choose any faceplate colour on an EVC product page and we pack it with your controller free of charge — normally $7.50 each.

Faceplates are an EVC part. They do not fit the evcX, which has a different display and housing.

Extra faceplates can be bought separately at any time if you want to change the look later.

Racing Solutions is an authorised Australian Ultimate9 dealer. Everything we supply is genuine Ultimate9 stock — never grey or parallel import.

Ultimate9 controllers carry a 30-day money-back guarantee and a limited lifetime replacement warranty.

If something goes wrong, contact us with your order number and we will start the process for you rather than sending you away to chase it yourself.

The controller plugs in at the accelerator pedal connector. No cutting, no splicing, and nothing permanent — it can be unplugged and the car returned to standard at any time.

Most installs take about 15 minutes. The unit is programmable for both automatic and manual transmissions.

It does not remap the engine and does not add power. What it changes is how quickly the throttle opens for a given amount of pedal, which is the dead spot people feel off the line and when towing.