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Jim Brown - USWildflower Motorsports RC Track in Spring Hill, Tennessee
Memorial Weekend 2015


I raced at a Memorial Day Bash this weekend at Wildflower Motorsports RC Track in Spring Hill, Tennessee with very impressive results. In addition to TQ'ing and winning eTruggy, my newest Tekno chassis: EB-48SL (SuperLight) out performed my standard eBuggy (EB-48.2), qualifying me 6th in the B main, winning the B main, bumping to the A, finishing 6th overall. I was actually in contention in the top 3 before tangling with some traffic. dropping me back a few places.

The EB-48SL is the 4th 1/8th scale vehicle I've measured and input into RC CrewChief (my eTruggy being the 3rd). My SL's initial setup was completely based on RC3 and what I've learned using RC3 from the 3 previous models. My current setup varies only slightly from my initial setup. Once again, RC3 has been pivotal in taking the guess work out of setting these vehicles up, providing a huge jump start before hitting the track. Gone are the days where I dreaded "learning" a new geometry change or even worse, trying to learn the setup on a completely new car.

Thanks again for putting some usable "science" behind the setup of these scaled race cars. It has fast tracked my ability to get past the myths and "seat of the pants" advice that I have received from so many seasoned racers. I still am baffled by the range of advice given on a certain topic, as well as the inconsistency in terms and lingo when it gets explained. much less the inaccurate means of measurement.

Case in point: Front Toe Out.

Ask most racers or look at most setup sheets as to "what" they are running for front toe out. The answer is typically "between 1 and 2 degrees". I measure my front toe out using a camber gauge and a vertical "fence" that rigidly mounts to my setup board. When set to 2 degrees, it "looks" like 0 degrees to the naked eye. One of the upper level drivers (who purports that he runs "about 2 degrees" of toe out) asked me "why I didn't run any toe out?". I told him that I did and that I ran 2 degrees. I then asked to measure his toe out on my setup board/fence. What a surprise to measure over 4 degrees of toe out per wheel (NOT 1 to 2 degrees). To make this even more interesting, I asked him how he measures his toe out. He explained to me that a pro driver gave him steering link length measurements and that's how he sets his toe out. So, in truth, he did not actually know the actual toe out "angle". He knew the length of the steering tie rod lengths. It's no wonder anyone can benefit from such a "unit-less" form of measurement and reporting.

Sam Langer - CanadaRC Ottawa

What a wicked weekend in Ottawa! I got the 2wd Buggy bug now, And want to race more of it! Ended up taking 2nd place behind Matthew Olson in 1/8 eBuggy! My car was great, next time maybe a thinner front sway bar. I qualified 10th in 1/10 4wd Buggy (2nd in the B), Then bumped to the A main with a second place finish in the B main. Finished the weekend 9th in the A main which I am not too impressed with but still pretty good in the end. In 2wd buggy I qualified 5th with some serious competition in front and behind me. I ended up going all the way up to 2nd place, Then with two mistakes in a row down to 7th place, then back to 4th and that's where I stayed for the rest of the race! Overall great weekend thanks for all the guys at SAR that made the race great. Also thanks RC Crew Chief for the dialed setups and eGo bookkeeping for keeping me at the track!

Jim Brown - USASt Charles Raceway Club Race

I tweaked my setup last night on my Tekno. Most consistent its ever been. Qualified second and won the A main, something I have not done against these guys until now. RC3 has proven quite effective in taking the guess work out of setup. I am very glad to get away from unsubstantiated setup advice that floats around the pits.

Sam Langer - CanadaCanadian International RC Championships (CIC)

Finished third in Mod eBuggy against a very high level of competition. 380 total entries and 55 in eBuggy. This is the first of what will undoubtably be many podiums for Sam. Well Done!

Jim Brown - USATesting Day

Wednesday I took my equipment, including my laptop, to the track for some practice and test and tune. This is the first time I've used RC3 live at the track to make adjustments and see how the setup changes affected my lap times. The changes I made were focused down to ride frequency, roll stiffness, then front to rear roll center balance. This was on top of trying a new piston and oil combination. In other words, I showed up at the track with pistons and oils that I had never tried before. Upon our recent track layout change, I have been unhappy with the piston oil combination that I had been running.

The reasons that this was the first time using RC3 at the track are as follows:

1.) Up until now, I hadn't fully understood the importance of getting ALL of the measurements from my chassis into RC3. As a result, this delayed me in having confidence that I'd know what I was reading in RC3 and what changes I would make that would even be close to what I was hoping to get out of the assistance of the RC3 software.

2.) Developing the proper plan :

A.) Should I create a setup in RC3 that looks good on paper and put it on the car? OR
B.) Enter my current setup (that has worked "okay" for me up until this point) and make adjustments from there?

3.) Understand the physics behind the changes and how the software allows me to make those changes to get the desired results.

In summary, I finally put extreme diligence into getting ALL of the measurements into RC3. The ones that were "off" the most were the "Mass" values. The values that were there were from another model (I think). Maybe the Mugen MBX6 model that came with the software. I also confirmed some of the other measurements such as X1 and Y1, realizing that I hadn't been as precise as I could have been after watching your video on measuring the B44.

From there, I decided to enter the current physical settings that I had been using on my car into RC3 (2B above) to use as a baseline, looking first at the relationship between the front and rear ride frequencies.

My testing procedure at the track, was to first confirm (or not) that the piston and oil changes that I made were at least "in the ballpark" in terms of jump/bump handling and just not too soft (bottoming out or too much raising and lowering of the front and rear due to too soft of damping). Quite to my pleasant surprise, this "felt" pretty spot on.

Since piston/oil changes is not something RC3 addresses (please correct me if I'm wrong), my decision to get this at least "close" and then leave it alone was important.

Once I was comfortable with the piston/oil combinations, I put in some laps with my current, "base" setup. This is with our timing system at the track "on" and putting in 20+ laps per test session to get enough data for comparison (looking for overall consistency).

Base setup was "okay", but seemed unpredictable or "uncomfortable" under certain circumstances. It was inconsistent as well, feeling good on one lap and not the next on the same obstacle, perhaps just a slightly different line.

The base setup had higher Ride Stiffness and Frequency values over the front:

F/R Ride Stiffness: 0.17/0.16
F/R Ride Frequency: 2.28/2.13

I changed to a stiffer rear spring and shock mounting positions to get the following values:

F/R Ride Stiffness: 0.16/0.19
F/R Ride Frequency: 2.21/2.36

This made the car feel more balanced and consistent
br /> It still needed a little more agressive steering, so I lowered the Front Roll Center from:

8.78mm to 4.24mm

This was even better. A change for the good again.

Results:

Base Setup:
Fast Lap: 24.793 seconds
Ave Top 5 Laps: 24.952 seconds
Ave Top 10 Laps: 25.084 seconds
Ave Top 15: 25.193 seconds
Ave Top 20: 25.338 seconds
24 Sec Laps: 3@24.88 ave
25 Sec Laps: 16@25.38 ave
26 Sec Laps: 5@26.39 ave
27 Sec Laps: 4@27.13 ave

Final Setup Using RC3 to Adjust:
Fast Lap: 24.219 seconds
Ave Top 5 Laps:24.331 seconds
Ave Top 10 Laps: 24.463 seconds
Ave Top 15: 24.550 seconds
Ave Top 20: 24.615 seconds
24 Sec Laps: 26@24.69 ave
25 Sec Laps: 6@25.47 ave
26 Sec Laps: 3@26.42 ave
27 Sec Laps: 0@0.00 ave

My point in all of this detail is just to provide some feedback based on the use of RC3.

Love the RC3 product. Looking forward to racing this weekend with the new setup.

Race Day

The weather finally gave us a break down here in the bayou bringing in two of our local fast guys to our track at SCR Saturday night. I seldom (if ever) out qualify these guys, usually not even within 15 seconds of their qualifying times. Not only did I out qualify both of these drivers, I TQ'd eBuggy and had the fastest overall time of the night, including nitro buggy, where one of these drivers races both; typically faster in nitro buggy. Two areas that I have been looking for are corner speed and just a better working car. What has felt "good" has always seemed lacking, providing inconsistent performance. Using RC3 to measure and change the ride frequencies and roll centers has provided me with a tool to overcome both of these. Thanks for helping educate us with RC3