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RRE's Apex Auto Timer Instructions


Easy to use and great looking too.  The control/display head is about the size of a marking pen  The joystick control button allows easy navigation through all of the different menus. The new timer can automatically determine the necessary amount of after idling time by calculating how hard you have been driving.
A Manual Mode allows the user to preset desired idling times from 0 sec.~10 minutes. By inputting O2 sensor voltage, the Timer can also display theoretical air fuel ratio. The Timer can also display critical data such as O2 sensor voltage and Battery Voltage. The handbrake safety feature shuts off the vehicle when the handbrake is released without the ignition key.
apex-tt-1gondash.jpg (37665 bytes)  The small size makes the This allows a clean and stylish installation virtually anywhere inside the car. Double sided tape is all that is required, no drilling necessary.
But I already have a turbo timer :-(

Sell it. Buy this one :-)

Apex Auto Timer Wiring Diagram (PDF File)

Apex Auto Timer Instructions (PDF File)

apex-tt-allparts.jpg (28445 bytes)

 Remote controller and relay box along with harness shown here

Interpreting O2 Sensor Voltage Readings:

Every car is different when it comes to your tuning settings. The O2 sensors were never designed to be accurate to with in .1v For the most part these numbers will help but you can not compare numbers as gospel with someone else's. O2 sensor voltage decreases with increased heat. As you make more and more consecutive tuning runs, the O2 sensor voltage you see will decrease a bit even though your air/fuel ratio is remaining constant.

At idle and part throttle you want to see the voltage cycling up and down between .2 and .8 roughly.

Typically, your O2 voltage will cycle like this:

.2-.8-.3.-.8-.1-.6-.2-.8-.3-.8-.4.-.9..2-.8-.2-.8.1-.9.........up and down, up and down, up and down........

When you go past 40% throttle the voltage will be set at what ever you have the AFC set at. This is the same for full throttle.

2G 95-99 Turbo

On 91 octane gas you will want .94-.95v If you are at a higher altitude then lower voltage is OK.
On 92 octane gas you will want .94v
On 93-94 octane gas you can get away with .92v

When the O2 sensor heats up after several runs, the voltage out put will drop off a little. What was .94v will drop to .92v. This is normal.

1G 90-94 Turbo

The O2 voltage will vary a lot more from car to car. Your numbers can vary from these easily by as much as .05v. 1G cars have more grounding issues and 90s in particular will read leaner (lower voltage) With a 1G car the compression is lower too so you can run leaner before getting knock that retards timing.

On 91 octane gas you will want .89 to .91v If you are at a higher altitude then lower voltage is OK.
On 92 octane gas you will want .88v
On 93-94 octane gas you can get away with .86v

The same applies to the O2 Voltage when the O2 sensor heats up, it will drop some.


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13022 La Dana Ct.
Santa Fe Springs, Ca. 90670
Tel (562) 777-1522     Fax (562) 777-1562
This page created and maintained by last updated 7/02mw