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Turbo Timer Install

With a plug-n-play harness, installing a turbo timer on an Evo 8 is fairly simple, but we get many questions on it regardless. For this article, we will be installing a GReddy turbo timer using the GReddy harness for the Evos. Note that most turbo timers use the same harness connection, so a GReddy turbo timer harness will work on HKS and Apex timers and vice versa. The most notable difference between harness brands will be any extra wires for auxiliary purposes.

1. First, a look of what we are installing (top pic). GReddy turbo timer with its included power harness and auxiliary harness. The GReddy "Evo turbo timer harnesss" on the right of the photo is sold separately, but makes connecting the head unit to the ignition wiring a simple plug and play operation. Note to step 2
2. Prior to starting installation, disconnect the negative battery terminal. Remove the three Phillips screws from the bottom of the steering column cover (bottom pic).
3. Carefully unsnap the top part of the steering column cover off of the lower part and set it aside. This of course is easiest with the column in its lowest position. To remove the lower half of the column cover, first pull the cover away from the column and over the key cylinder on the right side. With the column adjustment level unlocked (down), remove the lower section of the column cover. Note to step 4
4. NOTE: the deep well for the rear screw sticks way up and may make it tricky to pull the lower cover foward past the ignition switch on the right side (bottom pic). The plastic column cover has a fair amount of give, so simply pulling the protuding well to the right will make this easier. If you do not want to risk pulling the well to remove the lower cover, you will need to pull the dash panel directly under the steering column to drop it straight down.
5. On the left side of the steering column, locate the ignition harness connection (top pic). Note to step 6
6. Simply press in the release tab on the inside of the white harness connector and pull the harness out of the ignition connector (middle pic). CAREFUL! As can be seen in the photo, there are plenty of sharp edges under here to cut yourself. Note to step 7
7. The ignition harness unplugged (bottom pic).
8. Follow the ignition harness wires back and you will see the white plastic holder they run through (top pic). Note to step 9
9. Open the flap that retains the wires by prying the top flap up and left. It was a difficult shot and none came out well, so no picture of that, sorry :) Just lift the top of the flap up with a small flathead or similar tool to clear the snap tabs and then push the flap to the left to open it (bottom pic).
10. Grab your Evo turbo timer harness. Plug the male side into the factory ignition harness that was unplugged and the female side into the ignition connector on the column. It only fits one way. With the timer harness connected between the ignition harness and ignition connector, push the slack back under the dash and lay the timer harness wires into the white holder that the factory wires ran through. The fit will be a little tighter, but get them a flat as possible and then snap the flap back into the place to hold them.
11. Under the dash, tie up the added slack from the factory wires, leaving the harness with the 3-pin connector for the timer free.
12. Now grab the timer power harness supplied with the timer. Simply plug in the matching side to the 3-pin connector hanging free from the Evo turbo timer harness that was just put inline on the column (pic). Running the power harness to the timer itself will vary depending where you will be installing the head unit of the timer, but make sure that all wires are tied up securely however you route them. NOTE: GReddy, as well as other turbo timer harnesses, often include extra wire connections that may be used to power other electronics. In this case, the red, green and white wires with connectors are extra and will be taped off and tied up to prevent contact with any ground.
13. With the power harness routed to the final destination, all that is left in order to get the timer working is to ground the single black wire on the timer side of the power harness. NOTE: Make sure to use a good chassis ground. One of our favorite grounding locations is one of the bolts behind the radio (shown).
14. Plug in the 4-pin side of the timer power harness to the matching 4-pin connector of the timer. All power and ignition connections should now be complete (turbo timer ignition harness and one ground). Before continuing, reconnect the battery and test the timer. Turn the ignition to ACC and power on the timer if necessary. Set any parameters of the timer if necessary and for test purposes, select one of the preset timers and set it for 10 seconds. Start the engine. After the timer finishes initializing, turn the key OFF. The engine should remain running and the preset counter should begin counting down (from the 10 second test time). When it reaches 0, the engine should shut off. If so, the main function of the timer is working properly. Disconnect the negative battery terminal again and continue...
15. It is your option to either finalize mounting of the head unit at this time or continue connecting any safety or monitoring features. At a minimum, a turbo timer will include a parking brake connection to kill the timer should the parking brake be released while the timer is counting down. This is both a safety feature and anti-theft. The parking brake connection is a simple one-wire hook-up and we highly recommend doing it! Note to step 16
16. To connect the parking brake wire to the turbo timer (brown on the GReddy auxiliary harness), we must remove the center console. To remove the rear section, remove the two Phillips screws at the bottom of the center console storage under the armrest (top pic). Lift the console up enough to remove the tabs in the front holding it to the front section of the console, the lift the rear of the console over the set emergency brake handle. Before totally removing it, disconnect the harnesses to the IC sprayer switch and the cigarette lighter (circled in bottom pic).
17. Unscrew the shifter knob and remove the ashtray. Remove the three Phillips screws circled (top pic). On the passenger side, pull off the inner kick panel at the front of the center console. Remove the pop fastener holding the front of the console to the metal frame (bottom pic). Do the same on the driver side inner kick panel, though a plastic Phillips head fastener is used instead of snaps (not shown). Note to step 18
18. The front section of the center console should now be free to pull off. Having the shifter in the 4th or Reverse positions will make this a little easier.
19. With the center console removed, you are now able to run the emergency brake wire (Brown on the GReddy auxiliary harness) to the e-brake switch. There is a single-wire harness near the base of the e-brake handle with a Blue w/Red stripe wire on it. Simply tap the e-brake wire from the timer to the Blue w/Red strip wire connected to the emergency brake.
20. The last connection for the GReddy turbo timer, is the speed sensor wire (purple on the GReddy auxiliary harness). This is simply tapped to the Vehicle Speed Sensor (VSS) pin on the ECU (pin #86). See the Evo ECU diagram in the Evo Tech->Installations->Electronics section for finding the correct wire for this connection and/or ECU pins to connect features available on other turbo timers. As seen in the photo, this Evo is using an ECU harness extension with a wire already tapped to the VSS pin for a management system (blue), so the purple timer speed sensor wire was tapped directly to that.
21. Reconnect the negative battery terminal and test timer, emergency brake and speed functions of the timer. If everything was done correctly, all of the GReddy turbo timer functions will now work and the interior can be buttoned back up. Don't forget to adjust the Speed setting on the timer so it matches the speedometer in the car. Set the presets and you are done!

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