mikehayes

Van, this is some sweet engineering. I love the scientific evidence approach.

coonabarabran

Thanks Van. What's the range of movement overall, is it in fractions of an inch, or several inches? I'd like to do similar, and I have two spare analog channels on my Vbox Lite, Micro Input module available. It looks like a similar potentiometer based system to your earlier one? What's the value of the pot? Are you still using the original display device?

924RACR

Finally got around to a good, working install on my racecar (the prototype)... and some good pics of that install.

This is using sensors from the 5th-gen Camaro Z28 (2014, IIRC)... hope these pics come through properly... of course, these are tied to my suspension arms, but you get the idea...

(Oh, I should add... my data system is a Race Technologies DL1, and range of motion of these sensors is something like 2" I think... I'm of course not using all of that, my suspension only moves maybe 3" total at the wheels!

Van

Those initial pictures (measuring off the sway bars) were a Traqmate system with the little expansion module which allowed extra analog inputs.

My current system is Aim, and again, the potentiometers are on analog channels. The data system has it's own isolate 5v output, and then the input is somewhere between 0v and 5v (read in millivolts). Wheel travel is about 4", with ride height being about half way. I made the bell crank setup so the pot would rotate about 90 degrees, to keep the linkage moving smoothly and not bind up at the extents.

Then, with the Aim setup software, I could articulate the suspension (took the spring off), and calibrate each wheel for the millivolts at ride height (0"), 1" of wheel movement up, full bump, 1" of wheel movement down, full droop, etc. (I made shock extension negative inches.)

Now, to get meaningful shock data, I sample at 200Hz. At 150 MPH, you're traveling about 150 feet every second. That means the data system is taking a shock position measurement every 9" (think about how long a dip or bump might be...).

T&T Racing

+1 Nice installation
What is the part number and what is the voltage input range and what is the output voltage range?

924RACR

5VDC in and out... don't have the part #'s handy, but you can find 'em through GM Parts Direct or the like, looking up that application. One specifically for each corner, front and rear, left and right, use as you prefer.

Had to order the connectors separately from Mouser, connector body is part # 829-13511996 at Mouser, and connector pin and seal are 829-12191819 and 829-15366060 respectively...

924RACR

OK, found the sensor info. These are for the fronts; only difference from the rears is mounting pieces. They come with the plastic-end actuator rod, but you'll want the ball studs to mount on the suspension arms:
23137350 FRONT SENSOR

23137351 FRONT SENSOR

10271003 LOWER CNTRL ARM BALL STUD

coonabarabran

Excellent, thanks Van, 924RACR great information. The Comaro ride sensors are available for far less than the String Potentiometers I was considering. Thanks for the tip on sampling Van, I hadn't considered the rate and when cornering at speed, you need to sample very quickly or lose vital information.