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Digitalis Maximus

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About Digitalis Maximus

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    Track Freak

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  1. A few things have changed since 2013... 1. It's not green anymore 2. added a wing/splitter 3. Broke lots of stuff 3. Learned to drive :) I still love every lap in the little Datsun. :)
  2. The arduino uses C++ code for control. I have no formal training but I was able to get it to do roughly what I wanted it to do in a couple of hours of playing with it. I mostly cut and paste from example script commonly available on the internet and then do a google deep drill when things don't go as planned. You can get a VERY extensive arduino kit for about $50 on Amazon. I'm working on hacking into my OBDII port with the Arduino now to see what cool things I can do with my daily driver.
  3. Thanks Matt! One of the reasons I built the RC car prototype was to play with things like code for data noise filtering.
  4. Thanks. It will be interesting what the price of their offering will be when they release it next month. The laser system should have the advantage of not being sensitive to over extension like the linear pot would. I'm not sure how a light based measuring system would cope with the dirty environment found in the wheel well of a race car.
  5. The AIM system is just a linear potentiometer with a datalogging box. If the ultrasonics don't work out I will build an AIM-like system from the Ardiuno and a linear pot.
  6. I think the AIM system would work nicely in this application but I was hoping to keep the cost down. An AIM sensor is $250 where an ultrasonic sensor is $3.
  7. I've been playing with downforce on my car for the last year or so with some fairly impressive results. With the addition of a wing and splitter I was able to get lap times from 1:47.x to 1:44.x at MSR Houston. I want to continue aerodynamic development on the car but I need better feedback than I can get from a Traqmate system. Since opensource electronic prototyping with systems like the Arduino has become cheap and easy I decided to work on a home brew system to measure downforce as a function of speed. https://www.arduino.cc/ Ride height should vary with downforce so I decided to take a crack at building a prototype from an Arduino Uno mounted on an RC car. The system currently uses an ultrasonic distance sensor to measure ride height and outputs the reading to an LCD screen. I still have to hook up the SD card logger and add some sort of signal averaging function to the code to take the noise out of the system. Once I get the bugs out I will mount it to my car and calibrate the system with static weights. If the ultrasonics won't put up with the abuse of living in the wheel well of a race car then I will look for other options such as hooking the Arduino up to some sort of linear potentiometer hooked up to the struts. With any luck, once I get the system working I should be able to tune the aerodynamics by running the car down a road at various speeds while recording ride height. https://www.youtube.com/watch?v=It7nVN5V-mQ
  8. I'm in the process of wrapping mine with 3M vinyl. It's an easy but time consuming process. The car was in reasonable shape before starting. No major damage, just a multi-decade old paint job. I pounded out the dings and dents then spot primed and wrapped. I've painted cars before but this is the first time I've played with vinyl. I don't think that wrapping is any less time consuming than paint but it's less messy and less expensive. Before... After...
  9. I was behind you at the charity race when you "did just that". A momentary lift can help the car rotate as long as you get back on the gas quickly to quiet the rear end. More than a momentary lift can turn your car into a frisbee. It's all about moderation. :)
  10. I love these type of threads and I agree with much of what has been discussed. One other technique that I would like to throw into the conversation is the concept of adding speed early in a turn so that the extra momentum that you buy with early throttle can be used to transfer weight forward and rotate the car later in the turn. I use this technique in cars that are prone to understeer in places such as the entrance to launch at MSR-Houston going CCW. If you get on the throttle a little early in keyhole you can breath off the throttle momentarily to put weight on the front of the car to help it make the off camber right hander before launch. Just my $0.02
  11. I think I can find time for a few laps. What time do you plan to be there?
  12. Car: 1971 Datsun 240Z Direction: CW Date: Dec 29, 2015 Lap time: 1:46.6 (Traqmate) Estimated weight: 2750 with driver and passenger Estimated wheel HP: 240 Tire: 235/40-17 NT01 Lap time recorded with a passenger during an open track day.
  13. Unfortunately pad compound selection is a very personal thing. It's a function of both equipment and driving style. I've seen a WRL car go multiple events on a set of pads but in a subsequent event at the same track chew through 101% of a set in one day. In this case the difference in brake life was greatly influenced from event to event by the makeup of the driver team. Beyond the correlation of brake life with lap time, it's been my experience that drivers that brake hard and are on the gas early tend to burn through brakes more quickly than drivers that trail brake deeper and subsequently delay throttle input. In other words, it's very difficult to make any more than broad comparisons of brake pad performance across vehicles and drivers. Just my $0.02
  14. I'm in(structing) both days and driving the WRL event at COTA in February so it will be nice to get a few more laps under my belt before the event.
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