Inching forward on the build. For the sake of completeness this post covers the finishing touches to the pedal assembly.
Previous posts(Post #90, #91, #153, #171, #224, #232, #244, and #290) document the approach to adding power brakes to the SLC and also designing some fore-aft adjustability to the Tilton pedal assembly.
This post covers adding the GM drive by wire throttle pedal, clutch master cylinder and also how I’ll monitor brake and clutch pedal travel for various purposes.
First up is the install of the GM Throttle Pedal. RCR provides a bracket which mounts the GM throttle pedal to the side of the Tilton pedal assembly. It is up to the builder to add a linkage which connects the Tilton pedal assembly to the GM drive by wire throttle pedal.
Here is one example of how the GM throttle pedal could be fitted to the Tilton pedal assembly using the RCR bracket…
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When installing the pedal assembly, I aligned it to the seating position. It turned out there is not enough room to the right of the pedal assembly for the GM Throttle Pedal so I could not use the RCR bracket as designed…
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I have a semi adjustable pedal assembly so it would have been nice to design a solution where the GM throttle pedal moves with the Tilton pedal assembly. I played around with a few designs and also considered RCR’s optional cable mounted throttle pedal kit.
In the end I decided to simply mount the throttle pedal on the front chassis wall. Hector and Cam T took this approach. So fabricated a mounting bracket which is similar to a mirror image of the RCR bracket with mounting holes positioned to mount it on the chassis front bulkhead...
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With the bracket mounted high on the chassis front bulkhead, the GM Throttle pedal is placed out of the way and aligns nicely with the holes in the Tilton pedal assembly…
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Purchased the following from McMaster Carr for the pedal linkage:
1) McMaster Carr PN 97832A - 18-8 Stainless Steel Shoulder Screw - 1/4" Shoulder Diameter, 7/8" Shoulder Length
2) McMaster Carr PN 94450A220 - Left-Hand Threaded 18-8 Stainless Steel Thin Hex Nut
1/4"-28 Thread Size
3)McMaster Carr PN 91847A429 - 18-8 Stainless Steel Thin Hex Nut 1/4"-28 Thread Size
4)McMaster Carr PN 90101A011 - 18-8 Stainless Steel Shoulder Screw 1/4" Shoulder Diameter, 9/16" Shoulder Length, 10-24 Thread Size
5)McMaster Carr PN 59915KA - Corrosion-Resistant Ball Joint Rod End 1/4"-28 Internal Thread, Right Hand
6)McMaster Carr PN 59915K4 - Corrosion-Resistant Ball Joint Rod End 1/4"-28 Internal Thread, Left Hand
7)McMaster Carr PN 8422N9 - 18-8 Stainless Steel Turnbuckle-Style Connecting Rod
1/4"-28 Thread, 6" Overall Length
8)McMaster Carr PN 918310A - 18-8 Stainless Steel Nylon-Insert Locknut 10-24 Thread Size
Another benefit of this approach is that you can choose any of the linkage holes in the Tilton throttle pedal to adjust the ratio. The top holes provide the most aggressive throttle response and the bottom providing the least. By rotating the turnbuckle it will adjust to fit in any of the holes in the Tilton Pedal. I chose a starting point right in the middle. Also removed the spring from the Tilton Throttle Pedal to reduce pedal pressure required. No need to have two throttle pedal springs. Pic of the linkage installed…
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Now on to the brake and clutch switches. The approach is to use the AIM hydraulic pressure sensors. These sensors have a range of 0-2000 psi so they can be configured in the AIM PDM for the following purposes:
1)Display brake bias
2)Trigger brake lights when PDM senses light brake pedal pressure in either front or rear brake lines
3)Enable starter when PDM senses medium brake pedal pressure and full clutch pedal pressure
4)Disengage cruise control when PDM senses either light brake or clutch pedal pressure
Pic of the brake pressure sensors installed. The front pressure sensor is installed after the proportioning valve…
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Used the 3/4” Wilwood master cylinder for the clutch. Had to trim the threaded rod down a bit, but otherwise it bolts to the Tilton Pedal assembly nicely…
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The clutch line bulkhead fitting was installed in a non stock location and could not use the RCR provided stainless clutch hose. Purchased the following items to connect the clutch pressure sensor to the master cylinder:
1)Speedflow PN AF140-03-SS - 3AN to 1/8 NPT Tee
2)Russel 655022 -3AN to Straight 3AN 90-Degree Hose
Clutch fluid pedal sensor installed…
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Pedal assembly mounted in the chassis. I like how clean the installation is…
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From the behind…
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Lastly, if I ever needed to move the pedals forward or backward it would require different length push rods for both the accelerator and brake pedals. The design goal was not to be able to quickly move the pedals, but rather if they had to move, I wanted to avoid drilling any additional holes in the chassis. So all in all I am satisfied with the setup.
Another item checked off the list!