The EMPI trigger shifter is a popular upgrade for Volkswagen enthusiasts seeking improved gear engagement and a more refined driving experience. Known for its distinctive trigger mechanism that allows for reverse gear override, the EMPI trigger shifter requires specific installation and customization to function correctly. This article explores the key considerations for installing and modifying the EMPI trigger shifter, including thread specifications, reverse lock-out mechanisms, and compatibility with custom components.
Understanding the EMPI Trigger Shifter
The EMPI trigger shifter is designed with a unique reverse override feature. Unlike standard shifters, the EMPI model includes a recessed area at the bottom of the trigger ball to allow the trigger housing to slide into when reverse gear is engaged. This feature is essential for preventing accidental engagement of reverse gear and ensuring the override mechanism functions as intended.
According to a detailed discussion in an online forum, the ball on the EMPI trigger shifter has a pocket cast into the mount before the threads begin. This recess allows the trigger housing to move up and disengage the reverse lock-out. If a standard ball is used in place of the EMPI-specific ball, the trigger may not reach the necessary height to override the reverse lock-out, rendering the feature ineffective.
Users are advised to retain the original EMPI ball or to have a body shop paint it in a desired color, such as ivory, rather than replacing it with an incompatible component.
Thread Specifications and Compatibility
A critical technical detail for EMPI trigger shifter installation is the thread specification. Forum contributors have confirmed that the EMPI shifter uses a 3/8-24 thread. This means that the shifter shaft is threaded with a 3/8-inch diameter and 24 threads per inch. This is an important detail for those planning to replace the shift ball or install a custom knob.
One user noted that when using a small shift knob, the recess in the ball is not necessary, as the knob does not thread far enough onto the shaft to interfere with the trigger mechanism. However, for users seeking to replace or customize the ball, it is essential to ensure that the new component includes the necessary recess or counter-sink to accommodate the trigger housing.
A detailed diagram was shared in one of the discussions to illustrate the dimensions of the recess. However, some users questioned the accuracy of the measurements listed—1.9 mm and 1 mm—suggesting that the values might have been misinterpreted as millimeters rather than centimeters. While the exact dimensions are not confirmed in the source material, the general principle remains: the recess must be sufficient to allow the trigger mechanism to function without obstruction.
For those seeking to modify or replace the shift ball, one recommended vendor is Gene at flameball.com. A user shared that Gene counter-sunk the inner lip of the ball to ensure the reverse lock-out mechanism works correctly. This customization not only resolved functional issues but also improved the aesthetic appearance of the shifter.
Reverse Lock-Out Mechanism
The reverse lock-out mechanism is a key safety and usability feature of the EMPI trigger shifter. This mechanism prevents the driver from accidentally shifting into reverse unless the trigger is pulled upward, which disengages the lock-out. Without a properly functioning reverse lock-out, the shifter could pose a risk of unintended gear selection, particularly in tight driving conditions or during downshifting.
As noted in one of the forum discussions, a user experienced difficulty when downshifting from third gear into reverse, resulting in gear grinding. This issue was attributed to the stop plate and the EMPI quick shifter plate. The stop plate is a mechanical component that limits the movement of the gear lever to prevent over-reach into unintended gears. When properly installed, the stop plate should prevent the driver from shifting past the second gear without pulling the trigger.
The user confirmed that both the stop plate and the EMPI quick shifter plate were installed correctly, suggesting that the issue might stem from a mechanical limitation or an adjustment problem. While the stop plate and quick shifter are designed to work together, improper alignment or wear can lead to inconsistencies in gear selection.
Users are advised to regularly inspect the stop plate and ensure that it is securely fastened and aligned with the gear lever. Additionally, if grinding or resistance is encountered when shifting into reverse, it may be necessary to check the condition of the reverse lock-out mechanism and the trigger housing.
Customization and Aesthetic Options
Beyond functional installation, many users are interested in customizing the appearance of their EMPI trigger shifter. One common customization is the replacement or painting of the shift ball. As previously mentioned, users can retain the original ball and have it painted by a local body shop. This approach preserves the functional integrity of the shifter while allowing for a personalized color choice.
Another option is to source a custom shift ball from a third-party vendor. Gene at flameball.com is frequently recommended for this purpose, as he offers a counter-sunk design that ensures compatibility with the EMPI trigger mechanism. The counter-sunk design not only improves the function of the shifter but also enhances its visual appeal.
For users who prefer a different look, small shift knobs can be used as an alternative to the full ball. These knobs thread onto the 3/8-24 shifter shaft and do not require the recessed area found in the EMPI ball. This makes them a simpler option for those who do not need the reverse override feature.
EMPI Shifter Accessories and Gauges
While the primary focus of the discussion centers on the trigger shifter, EMPI also offers a range of accessories and gauges for classic Volkswagen models. One such product is the EMPI Driver’s Gauges, which are designed to complement the aesthetic and functional needs of classic VW enthusiasts.
These gauges feature a 52mm diameter, black bezels, and bright white markings with a red needle for improved visibility. They include incandescent backlighting, which provides a warm glow rather than the stark white light of LED-based alternatives. The gauges are compatible with various senders, including the V3-6000-1, V3-6000-3, V3-6000-6, and V3-6000-9 models. The oil pressure gauge, for instance, operates within a range of 0-80 psi and is compatible with a wide range of sender types.
While these gauges are not directly related to the trigger shifter installation, they are part of EMPI’s broader product lineup and may be of interest to users looking to enhance the overall driving experience of their classic VW.
Installation and Maintenance Considerations
When installing or replacing the EMPI trigger shifter, it is important to follow proper installation procedures to ensure both functionality and safety. The process generally involves removing the existing shifter and installing the EMPI unit in its place. Key steps include:
- Ensuring the 3/8-24 thread is clean and undamaged.
- Verifying that the trigger mechanism is aligned correctly with the reverse lock-out.
- Checking the stop plate and quick shifter plate for proper installation and alignment.
- Testing the shifter in all gears, particularly reverse, to confirm that the trigger override works as intended.
After installation, regular maintenance is recommended. This includes inspecting the shifter for signs of wear, checking the tightness of all bolts and fasteners, and ensuring that the trigger mechanism remains smooth and unobstructed. If grinding or resistance is experienced during gear selection, it is advisable to investigate the condition of the stop plate, reverse lock-out, and trigger housing.
Conclusion
The EMPI trigger shifter is a specialized component designed to improve gear engagement and provide a reverse override feature. Proper installation and customization are essential to ensure that the shifter functions as intended. Key considerations include thread specifications, the necessity of the recessed area in the shift ball, and the compatibility of custom components. Users are encouraged to retain the original ball or seek professional customization to maintain the functionality of the reverse lock-out. Regular inspection and maintenance are also important to preserve the performance and longevity of the shifter.
For those looking to enhance the aesthetic and functional aspects of their classic VW, EMPI offers a range of accessories, including gauges that complement the overall design and utility of the vehicle.