maddmaxx ★ Posted January 16 Share #1 Posted January 16 This is the "stock" drag racing car I'll be running this year. It's based on the "ready to run" vehicles available over the counter with limited changes allowed. The power plant from any of the 3 major RTR cars on the market may be used with any of the 3 kits. So can the radio and tires. Batteries are limited but tuning stuff like shock and differential fluids can be changed. No other aftermarket parts are allowed. Witches Brew is based on a stock RTR Associated DR-10 pro. It has the radio, tires, esc and motor from a Traxxas RTR Drag Slash installed. I'm still trying to find out about the legality of changing bodies. If this one is not legal then I will have to put the stock RTR body back on, and easy change that does little to effect performance. 2 2 Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted January 16 Author Share #2 Posted January 16 1 2 Link to comment Share on other sites More sharing options...
Parr8hed Posted January 16 Share #3 Posted January 16 Looks awesome. Are those real Mickey Thompsons or do they just have the M/T written on them? Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted January 16 Author Share #4 Posted January 16 2 minutes ago, Parr8hed said: Looks awesome. Are those real Mickey Thompsons or do they just have the M/T written on them? They are licensed from Mickey Thompson and are provided with the Traxxas Drag Slash in both this stock version and a "sticky" version. They are a bit wider than most available RTR stock tires but respond very well to softening the rubber with WD40. Until I find out what tires other than stock will be allowed these are what I will use. They are not belted however and do grow (balloon) at higher speeds which shrinks the traction footprint near the finish line and contributes to some instability. I would prefer to run belted tires and probably can in local races as the groups around here have little use for national rules. 1 1 Link to comment Share on other sites More sharing options...
Parr8hed Posted January 16 Share #5 Posted January 16 5 minutes ago, maddmaxx said: They are licensed from Mickey Thompson and are provided with the Traxxas Drag Slash in both this stock version and a "sticky" version. They are a bit wider than most available RTR stock tires but respond very well to softening the rubber with WD40. Until I find out what tires other than stock will be allowed these are what I will use. They are not belted however and do grow (balloon) at higher speeds which shrinks the traction footprint near the finish line and contributes to some instability. I would prefer to run belted tires and probably can in local races as the groups around here have little use for national rules. Nice. That was a much more thorough answer than I expected! But cool nonetheless. 1 Link to comment Share on other sites More sharing options...
donkpow Posted January 16 Share #6 Posted January 16 Can you "lighten" stock components? Increasing power/weight. Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted January 16 Author Share #7 Posted January 16 18 minutes ago, donkpow said: Can you "lighten" stock components? Increasing power/weight. Probably not in the strictest sense of the rules. On this car I had to remvoe the waterproof radio box because the Traxxas receiver doesn't fit into the Associated box. Given that the car has a minimum weight rule of 2060 grams (about 4 1/2 lbs) and that no one can come even close to this with stock parts I doubt it matters much. This is really intended to be a buy it and race class for those who just want a budget car. You will understand more when I do the photo essay on "Witches Brew 2" the carbon fiber much modified car I will also be running. 1 Link to comment Share on other sites More sharing options...
donkpow Posted January 16 Share #8 Posted January 16 33 minutes ago, maddmaxx said: Probably not in the strictest sense of the rules. On this car I had to remvoe the waterproof radio box because the Traxxas receiver doesn't fit into the Associated box. Given that the car has a minimum weight rule of 2060 grams (about 4 1/2 lbs) and that no one can come even close to this with stock parts I doubt it matters much. This is really intended to be a buy it and race class for those who just want a budget car. You will understand more when I do the photo essay on "Witches Brew 2" the carbon fiber much modified car I will also be running. Well I remember you were talking about cutting back. Link to comment Share on other sites More sharing options...
bikeman564™ Posted January 16 Share #9 Posted January 16 1 hour ago, maddmaxx said: Associated I remember that name. Very cool car there. Is the cooling fan for the speed control? Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted January 16 Author Share #10 Posted January 16 2 minutes ago, bikeman564™ said: I remember that name. Very cool car there. Is the cooling fan for the speed control? That fan is for the speed control (ESC). These things get hot, even in a 2.5 second run. With only about 7.5 volts under load available from the battery we make power with lots of current. Even in a stock class car I would expect to see over 100 amps surge right after launch. Unfortunately, with the Traxxas ESC there is no way to tell anything about amps or volts or motor rpm etc. Witches Brew 2 has all that data gathering technology built in along with the ability to download it to my iPhone. 2 was built for a class that I might not race in. It's destined to be my "bracket racer and fun car technology demonstrator". The current hot setup in RC drag racing requires a mid motor car with considerably more weight on the front to keep the car from wheelstanding out of control. That's the fault of the allowed tire prep that gets far more traction than we were getting as little as a year ago. 1 Link to comment Share on other sites More sharing options...
bikeman564™ Posted January 16 Share #11 Posted January 16 1 minute ago, maddmaxx said: That fan is for the speed control (ESC). These things get hot, even in a 2.5 second run. With only about 7.5 volts under load available from the battery we make power with lots of current. Even in a stock class car I would expect to see over 100 amps surge right after launch. Unfortunately, with the Traxxas ESC there is no way to tell anything about amps or volts or motor rpm etc. Witches Brew 2 has all that data gathering technology built in along with the ability to download it to my iPhone. 2 was built for a class that I might not race in. It's destined to be my "bracket racer and fun car technology demonstrator". The current hot setup in RC drag racing requires a mid motor car with considerably more weight on the front to keep the car from wheelstanding out of control. That's the fault of the allowed tire prep that gets far more traction than we were getting as little as a year ago. My Frog came w/ a contact style speed control and had a couple remote ceramics for cooling. When I went to an electronic, It may of had a heat sink. Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted January 16 Author Share #12 Posted January 16 6 minutes ago, bikeman564™ said: My Frog came w/ a contact style speed control and had a couple remote ceramics for cooling. When I went to an electronic, It may of had a heat sink. The fan mostly helps cool things down while I turn around and drive back down the return road. Then if I don't shut off the car right away it helps with continuing to cool things before I have to make the next run, Keeping the ESC cool helps performance. Keeping the battery cool helps prevent fires that won't go out. That's one reason we use batteries with so much excess capacity. Good is something like 3/400 amps steady state with a 1200 amp surge capacity. 1 Link to comment Share on other sites More sharing options...
bikeman564™ Posted January 16 Share #13 Posted January 16 5 minutes ago, maddmaxx said: The fan mostly helps cool things down while I turn around and drive back down the return road. Then if I don't shut off the car right away it helps with continuing to cool things before I have to make the next run, Keeping the ESC cool helps performance. Keeping the battery cool helps prevent fires that won't go out. That's one reason we use batteries with so much excess capacity. Good is something like 3/400 amps steady state with a 1200 amp surge capacity. 👍 stock set up Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted January 16 Author Share #14 Posted January 16 5 minutes ago, bikeman564™ said: 👍 stock set up Haha. I remember those. We raced with them back in the late 70's. 1 Link to comment Share on other sites More sharing options...
bikeman564™ Posted January 16 Share #15 Posted January 16 1 minute ago, maddmaxx said: Haha. I remember those. We raced with them back in the late 70's. LOL. I was trying to find a pic on the internets. Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted January 17 Author Share #16 Posted January 17 Just a teaser for 2 Compare this to the above "stock class car". Link to comment Share on other sites More sharing options...
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