Doug, what is your driveshaft sensor issue? I have a RacePak Sportsman, and am also having issues with it.

When the SSI4 is set up to read Hertz we see no signal on Logworks. If you lie to Logworks and tell it it's a 0-5volt signal then the gauge on Logworks jumps around. So there is something there. Calling Inovate is like talking to the wall. "They say there guy will get back to us". No call or Email from them. Over a week. Once the shocks are here I'll put into gear and get some rpm into it and see.
Doug

Are you using a hall, a mag, or an MR sensor?

Hall effect, ZF GS 100201
Doug

Well the shock having issues when compressed is NOT helping for sure. Compression is used to keep the tire planted after initial hit so entirely possible you found the issue. You will find out soon enough. As for Wilwood I was always told to use the square cut o ring, but I have found no matter which you use they will eventually be right back to hanging up again.

With that sensor it should pick up at very low speeds. I have one on one of my front wheel that reads off the wheel studs, it reads just fine just by spinning it by hand. With 22 teeth and assuming you are turning the rear tires by hand it should read no problem.

Been a while since Ive used logworks, but isn’t there a “speed” selection? I do agree that it should work with freq. Are you using 5v reference or 12?

First off It appears that the brakes are repaired. There were some shims supplied with a set of pads that were installed a while ago. They wouldn't fit behind the new pads , no room. They cant be more than .060" thick. I decided now that pads had a little wear to try them. The backing plate of the pad has a few 1/2"? holes. Maybe something to due with the bonding ? anyway installed the shims and you can actually spin the wheels. To the driveshaft. Yes there is a speed selection.feeding the sensor with 5 volts. My son (Dizuster here) is bringing an oscilloscope tomorrow to try and troubleshoot the driveshaft issue. New Afco big guns are on. No time to test. I'm going to go out and race it Saturday. Hopefully my guess at the shock settings is close. We'll see.
Doug

I got into this a little late didn't read all the post's. Myself my motto is KISS= keep it simple stupid. I always look at myself first. First thing I see is launch RPM. I raced for years foot braking and found that you need that full shot of fuel on the launch. Be consistent on your rpm, Meaning, don't leave at 2700 one time then 3300 the next. I ran a holley and would leave at 2000 rpm to get the full excellerator pump shot. Made a huge difference if I changed. I hope it is something simple for you. Its usually cheaper.

We vary reaction time with starting line RPM. So it normally leaves between 2800-3200. Data logger still partial function. O2 is pegged full lean. Driveshaft sensor is sending a clear pulse. We watched it on an oscilloscope last night. Racing tomorrow with zero testing.
Doug

The square ones are supposed to pull the pistons back slightly when you release the brakes. Round O-rings will leave the pistons where they are when released.

Ran the car yesterday. Track prep was so so. I should've checked track temp but didnt. Air wasnt great. 90 degrees and humid.water grains over 100. That being said the car was pretty good. Took a guess at the initial shock settings and made 2 sets of adjustments. Since we were in eliminations didnt want to make to many changes. Car was very good. The new Afco rear shocks were the key. Obiviously the old rear shocks had an issue. Ran 60 ft within .01 all day. 60 ft is still slower than I'd like but I really believe part of that is the Edelbrock carbs lack of transition to the main circuit. That will be the next issue to attack once the data logger function. Car followed the weather station predictions with in less than .01 for 5 out of 6 passes. Got out of the groove in rd 4. Fell off .02. Lost by .005
Doug

I'm glad you are getting it figured out Doug! Well done!