We got some heat!
i don’t even know where to start i am so excited when writing this!
we had a “pro formula mazda” test day september 4th, a full day for testing, changing one thing at a time, you know well planned specific testing with seven potential changes on the agenda and was it productive!
before I get into it i have to say that the new guys on the team…….well they just aren’t behaving like new guy’s at all. watching them yesterday….. it was a team that was in sync to be sure. good on ya boys, great job!
so to get on with it, we arrive, unload the car and equipment, check the car alignment, make a toe change and were out for our first test.
test session 1.
we started with the springs and sway bar settings that gave us our best results to date, took all the aero out of the car, no down force at all. first 10 laps done, we come in and make a change, a front spring change, we went with a stiffer spring same sway bar settings. out on the track for session 2.
test session 2.
and what a great change it was. the car now turns in more on a knife edge so to speak and we lost some of the rear loose condition we had. also we got some heat into the tires…and this is the sick part, we are getting excited about hitting 140 degree tire temps. anyway, lap times improved, got some good baseline front and rear sway bar settings and the car is running well.
test session 3.
we put some rear wing into the car, about 2.5 degrees and went out, car was OK but we lost a little straight line speed, about .3 MPH….but the car was feeling quite strong. come in, review data again to make some changes…more rear wing.
why more rear wing? well our data guys, shawn and garry reviewed the previous sessions corner exit speeds, the GG plot, shock plots and they felt a little more aero in the rear just may give us added down force that would get rid of the rear loose condition, give us more corner bite thus more heat in the tires thereby giving us more stick and hopefully quicker lap times even though we would likely loose a little more straightaway speed. we have left the sway bars alone at this time as we are still seeking the correct spring rates for this track.
test session 4.
we got our tire temps to an average of 160 degrees
, we increased our straight line speed by 1mph and we did quicker lap times. you see, the addition of more rear wing got rid of the little loose condition and allowed the car to hook up better all though the turns and this results higher tire temps, higher temps mean better stick and way better corner exit speeds. better corner exit speeds means i am carrying more speed into the straightaway and as a result a quicker lap time with a higher top speed. the change worked great and i was surprised at the outcome…..not that we had a quicker lap time but of so much greater straightaway speed in the presence of more rear wing in the car, that said, we will take those results all day long!
it was a really great day, shawn seems to be getting the data sorted really quite well. garry knows the infrastructure of our MOTEC system really well, shawn knows how to read the data, look for trends and recommend chassis changes from the dynamic data we have just collected and finally we are really using the data to make the car go faster. in the past we collected data, we looked at the data, did some changes and had to go back to the data to see the outcome. no one on the team really was able to interpret the data in a meaningful way. yesterday we used data to take the car in the direction that would make it handle better and go faster with confidence. each change was based on the data collected by the system, reviewed and some applied chassis dynamics by shawn and changes were completed on the car and did it work well or what? we knew why we were making changes regardless of driver input, data reveals what’s really going on versus what the driver may report what’s going on. shawn could, from the chassis dynamics see what was really happening, he also recommended some changes i could do in the cockpit and then showed me the improvement on a gg data envelope plot right after each session, we were now using all the tools we have at our disposal, it was just a great day! i know more challenges are ahead but this test day has helped us alot so far.
test session 5.
we added a little more rear down force, another 2.5 degrees and went out. we were sharing the track with closed wheel cars all day so it was difficult to get a clear lap and it was the last session of the day but we thought …..why not? well we never did get a clear enough lap to see if the last change was better or not as there was just too much traffic but we did have have some excitement! i noticed a rear vibration when i was leaving the pit, a vibration big enough for me to feel at lower speeds but it seemed to go away at higher speeds…or so i thought. 2 laps into the session i notice in my left rear view mirror that the left rear tire has a wear pattern that’s not typical, i continue on but this wear pattern is starting to really get bad, i continue on and am going through a chicane at about 80 mph and then boom, the car pitches hard to the left and i am in the weeds on my way into the swamp….i finally get a hold of the car and get it back on the track but something on the rear left has let go. as i limp back to the pit…about 1/2 a mile i hear the grinding dragging sound of the car on the track surface….i am sitting in the cockpit thinking about what could have let go, how bad it was….how much dough-rae-me it will cost to fix….ugh…anyway, i get the car back to our pit and it isn’t that bad. a broken left rear push rod, the diffuser is a little hurt, the splitter tray needs to be replaced, the wood floor is all but done (we have a jabroc wood floor on the underside of the car to protect the carbon tub floor) and the car looks like it has just gone through a weed field…..i guess it should because…well …it was just through a weed field! we reviewed our rear video and it was clear that the push rod had fatigued most likely in test session 4 and simply continued to stress and ultimately fail (really glad it wasn’t driver error). anyway, a bad end to a great day but in hind sight it was one hell of a good test day, not even the broken push rod and incidental damage could take the smile off our faces! the car ran great, the guys did a fantastic job, we got the car to handle better and go faster. we are now using our data in the most productive way we ever have and these were the objectives…just a great day, just great!
and before i forget i would like to thank erica, vicky and doug reader from XPS construction (one of our advertisers, vicky is a project manager for XPS) for coming out…. and in team shirts no less, thanks for that…it was great to have you there even it was only for little bit! go to our gallery and you can see a photo of erica in the car with dad, doug along side, vicky took the picture. thanks again for coming out, we love it when you do. also our new web master, zach was out and mike from rotary engine .com. hope you guys had some fun as well.
so have we found the “elusive sweet spot” for car set up…..no…. not yet but we are going in the right direction finally, the car and i are getting along a little better and it may be real soon we report……we found it!
Blairica