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--- DSM PLUS Support ---

Shift Box PLUS - Product Support Page
Last updated 6/11/12

Basic instructions:

  • Once installed, this shift box is simple to use. Simply press the up-shift button to advance to the next gear, or press the down-shift button to drop to a lower gear.
  • This shift box will boot up in 3rd gear every time as a safety in case the shift box would ever reboot due to a power connection problem.
  • By default the downshift protection RPM is 4500RPM, see the menu below to change this, or disable the downshift protection.
  • To use the RPM up-shift feature, you must set the shift points to your desired RPM in the menu. Set the shift point ~1000RPM sooner than you want the shift to be made to start, and adjust as necessary. This is due to the delay inside the transmission to engage the clutches. You must enable the UP-SHIFTER in the menu to begin using this feature.
  • The overdrive off feature can be used by up-shifting to 4th gear. Press and hold the up button until the O/D off LED illuminates and the shift box downshifts to 3rd gear. To turn O/D back on, up-shift to 3rd gear and press and hold the up button until the O/D off LED turns off and the shift box up-shifts to 4th gear.
  • Note that the shifts are made at full line pressure, so learning the timing on when to make the shift will make using this shift box much more pleasurable on the street.
  • Note that the transmission has a delay of 500ms-1000ms for the actual shift to complete. This will vary some with engine speed and power level, and transmission adjustments. Be sure to shift early until you learn how long your transmission takes to perform the shift at WOT to prevent a possible over-rev of the engine.

Using the menu:

  • To enter the menu, down-shift to first gear using the down-shift button, then hold the down-shift button for ~ 5 seconds until you hear a series of beeps. The word MENU will be displayed
  • Below are the menu options. Bold print is what will be displayed on the LED display. Use the up button to toggle a menu item or advance a value. Use the down button to go to the next menu option.

UP-SHIFTER = ENABLED/DISABLED (Default is disabled, to use the RPM up-shifter feature, change to enable)
SHOW-ZEROS = ENABLED/DISABLED (Default is enabled, shows 5000RPM as 50 & 750ms as 75 for faster displaying of the menus)
DOWN-SHIFT-PROTECTION = ENABLED/DISABLED (Default is enabled, change if you do not wish to use the down-shift protection)
GEAR-SCROLL = ENABLED/DISABLED (Default is enabled. This option changes whether the gear numbers scroll or simply change)
AUDIO = ENABLED/DISABLED (Default is enabled. This option mutes the alerts when a shift is blocked, will not affect the menu beeps)
DOWN-SHIFT-PROTECTION = 4500 (Configurable from 3500-7000RPM. Default is 4500RPM)
1-2-UP-SHIFT-RPM = 5500 (Set the 1-2 shift point, configurable from 5000-12000RPM)
2-3-UP-SHIFT-RPM = 5500 (Set the 2-3 shift point, configurable from 5000-12000RPM)
3-4-UP-SHIFT-RPM = 5500 (Set the 3-4 shift point, configurable from 5000-12000RPM)
UP-SHIFTER DELAY = 750 (Delay after auto up-shifts to prevent double shifts, configurable from 500-1500 in 50ms steps, 750=default)
PULSE PER REV = 2 (Set the number of pulse per engine revolution - 4 cylinder=2, 6 cylinder=3, 8 cylinder=4, default=2)
RESTORE DEFAULTS? (Up button to restore factory default configuration) (added on version 007)
                CONFIRM RESTORE DEFAULTS? (Up button to confirm the restore defaults)
ABOUT? (Displays current software version and product web site address)
SAVE AND EXIT? (Up button to save and exit, down will advance back to the first menu option)

  • All settings are saved to flash memory as soon as the menu is exited, automatically

Testing the downshift protection:

  • On the bottom side of the shift box is a yellow/orange LED. This LED does a bulb test when the shift box is first powered up. See image for exact location.
  • This LED is used to indicate the downshift protection is working. When the engine RPM's are brought up above the set RPM, the LED will turn on. When the RPM's drop below the set RPM the led will turn off.
  • Note some flicker on this LED is normal, especially when near the set RPM due to timing belt flex and noise. If excessive, this may indicate your cam or crank angle sensor needs to be replaced.

Updating the firmware:

  • The most recent Shift Box PLUS firmware version is 007
  • Please send an e-mail to sales@forcedfour.com to inquire about updating your firmware. Please note this shift box does not support USB firmware updates and will need to be shipped to Forced Four to be updated.
  • (Note: All settings will be set to factory defaults when the firmware is updated)

Confused? Contact us at sales@forcedfour.com

Check out our tutorial video of this shift box in action!

Installation Instructions
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NOTE: The wiring is EXACTLY the same between the BASIC and the PLUS!

1990 DSM Wiring Diagram with TCU
1991-1992 DSM Wiring Diagram with TCU
1993-1994 DSM Wiring Diagram with TCU

1995-1999 DSM Wiring Diagram with TCU

1992 Stealth Wiring Diagram with TCU




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