MX-5

MSR Houston with The Driver’s Edge

David and I spent this weekend driving MSR Houston with The Driver’s Edge. It had been many years since TDE had run at MSR Houston, so relatively few of the participants were familiar with the track. As I had recently run the 24 Hours of Lemons Gator-O-Rama, I was familiar with MSR Houston. While I had 3+ hours of seat time at the track, that was with 100+ cars on track and with open passing, so I was rarely able to choose a technically correct line. This weekend provided me a fantastic opportunity to refine my line and understand the track in my car.

I had one real concern for the weekend. My only time on that track had been laps with open passing. I had never had to wait for a passing signal on that particular track – rather, I passed whenever I felt I could pull it off. My concern coming into this weekend was that I’d fall back into that habit and end up passing someone without a signal. Thankfully, the racecar (even the Triumph) and full gear feels significantly different from my still-street-car MX-5 in just a helmet.  As a result, I was behaving as I would at any other HPDE, waiting for passes.  I didn’t always wait patiently for these passes,  but I waited…

The Driver’s Edge was relatively new to this track at the time. I was one of the few who knew the line. As a result, I had many passengers on my sessions, and rode with other students in blue and yellow, helping them learn the line.  I love teaching and I love instructing, so this really increased my enjoyment of the weekend. I was able to share some tricks with some of the blue drivers, but saved a few tricks for my friends in red. MSR Houston can be demanding, technically, and some of these tricks are more appropriate for those with better car control and more seat time.

I did have some particular frustrations at that track. Texas World Speedway is a bit of a power track – there are enough long straights for power cars to leave me behind, even if they don’t carry as much speed through the corners. If I give a pass to a power car in red run group at TWS, I’ll never seen them again. Harris Hill Road is the opposite, a momentum track – the straights are so few and so short that the power cars with poor handling end up giving me a pass. MSR Houston is a great balance. It has some good, long straights, but also has a lot of fun, tricky twists. While this makes the track a lot of fun, it means it can be frustrating for a great handling car with very little power. The power cars don’t want to be caught behind me on the straights, so they don’t want to give me a pass. But then I end up stuck behind them through the corners.  If  I slow on the straights to build up some space, I’m caught by another car. It can be difficult to find space for myself, space to enjoy those fantastic, technical twists.

I really enjoy MSR-Houston. Hopefully I’ll find more events there to run this fall.

Mother at the Track

Last Saturday my mother came out to the track.

Getting my mother to drive on track was something I’ve wanted for some time. She’s been daily driving my old ’94 Miata for some time. On one TejasMiata drive, I caught her sliding through a corner. Later, she complained at me that the back was sliding too much as she accelerated through a turn. Note, that wasn’t “sliding,” that was “sliding too much.” I figured Mom needed a closed course to play on. She refused to autocross because she was worried about slowing down everyone else. But when we became members at Harris Hill Road, I discovered something. This was the perfect place! On a slow day, she could have the track all to herself. There’d be no one else on track for her to worry about.

So on a particularly cold, particularly slow Saturday, I invited her out. She arrived, and we went out on track. I made the mistake of forgetting to give her a proper introduction-to-the-track speech – somehow, I thought she’d just know it! So once she was behind the wheel, explaining the line, looking ahead, etc. was challenging for both of us. Additionally, I had lost my confidence in my mother and left my car’s traction control on (she was in my car, rather than hers, as hers lacks a roll bar).  My mother had a hard time understanding that we wanted the cornering and inputs to be smooth. She enjoys the forces and instability of throwing the car around a corner. While I agree that’s fun, I want her to get the basics of proper track driving, to understand why “the line” is what the line is, so that she’ll be able to make informed decisions about how and when to toss the car.

Eventually I came to my senses and turned off traction control. While that seems risky, the entire reason I wanted my mother on the track was because of her great car control skills! As soon as the car started responding to her as a car should (rather than as traction control would), her driving improved.  By this point in time, she was understanding why turn in, apex, and track out points are where they are. She tracked out beautifully coming out of corner 4… Except that left her in exactly the wrong place for corner 5! So while she came to understand “the line” as it applies to a single corner, she wasn’t yet able to string corners together. She complained that she couldn’t see corner 5 while in corner 4, and she kept forgetting it was there!

Mom said she had a great time, and she asked me to give her a track map with the braking points and turn-in, apex, and track-out points. We’ll see if she makes it out again!

By equiraptor on 15 January 2010 | MX-5, Track Time | A comment?
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Wet Weekend at Texas World Speedway

David and I were out at Texas Word Speedway this past weekend, running counter clockwise. While Saturday started out dry, rain rolled in about mid-day. While I have run in the rain, both on tracks and autocrossing, this was my first time to stick around though this much rain with conditions changing the way they were.

On Saturday, rain only came through once. Our third session of the day was quite wet. By our fourth session, the track was drying, with about half of it still wet and about half dry. My car is currently on some rather poor tires – the treadwear rating is 400! It takes only a few minutes of track time on a warm, dry day for the tires to get a greasy feel. As a result, for the first two sessions, I had fun with grip for about 5 minutes, then had fun re-learning limits as I continued to drive. The poor tires plus the rapid overheating meant I gave a lot of passing signals, but that’s ok. I also gained a lot of experience learning to control my aggression on track. I tend to brake late and try to carry speed through corners, so I over-drive easily. These tires have forced me to pull back a bit, go back to the basics of “slow in.”

In our third session on Saturday, the first rain session, we were all re-learning our limits. My car was being extremely oversteery, so I went to hot pit to make some setup changes. I softened things up, but the car still slid easily. By our fourth run session, the last of the day, the track was drying. In its part dry, part wet state, my tires did very well. The wet areas were just enough to keep the tires cool, and the dry bits were fast and fun. This was my favorite run session of the day.

On Sunday, the rain came and went, as the day went by. The track stayed damp for most of the day. One of the artifacts of Texas World Speedway being an older track is the surface has been repaired and patched over time. These different surfaces have some, but minimal, effect on a dry day. But in the wit, the traction difference was startling at times. Entering corner 6, I just let the car slide. I felt like I didn’t have a hope of actually having grip unless I went extremely slow, so I just let the car slip. Then, as the car approached the apex, it hit a patch. Suddenly, the front tires had a lot of grip. The back would shoot sideways, until the back hit the patch, and suddenly it flipped back behind the front. At first, I didn’t quite understand what was going on and it concerned me. Once I realized what was happening, I had fun with it. I’d let the car drift heavily through the turn in, and the car slipped hard then snick back in behind itself quite suddenly. As this happened, I’d smile at the corner workers, who’d smile and wave back at me.  They knew just what I was doing.

All-in-all, it was a challenging weekend, but a fun one.

2006 Miata

My primary vehicle is a 2006 Mazda MX-5 GT with premium package 1. It’s “Nordic Green” with a tan cloth top. As the power retracting hard top was not available that year, it was, in stock form, one of the heavier cars that year. I bought the car used, already modified. It has JIC FLT-A2 coilovers, spring rates of 6kg front, 5kg rear. The car had the AEM / Mazdaspeed CAI on it when I bought it, but I switched that to the K&N Apollo to remain legal for CSP. The car also has a lightweight flywheel, aftermarket clutch (nothing extreme), and a custom exhaust with resonators from Silverline. I have three sets of wheels for the car: the OEM 17x7s, 16×8 wheels from an FD RX-7, and 18×9.5 Enkei RP-F1s. I use the OEM wheels on the street, the Enkeis for autocross, and the FD wheels are waiting for some track rubber.

I enjoy a twitchy car, so I tend to go with more extreme toe settings than most would have. I prefer a bit of toe out on the front (just over .05º, but under .1º) and straight toe on the rear. I go with about .5º more camber on the rear than the front, with the exact amount depending on my emphasis this time around. If I’m autocrossing extensively, it’ll get more camber. If it’s mostly street and track, it’ll get less.

The car is an absolute joy to drive. The lightweight flywheel causes the throttle response to be quick and predictable. The clutch is similar to stock in feel and grab, and rev matching downshifts with this combination is easy. Unfortunately, people unfamiliar with the car tend to stall it at first, as the revs drop sharply as you clutch out at a stop. Once you know what to expect, it’s easy enough to drive. The transmission shifts from gear to gear easily, but the shifter has a notchy feel. Some complain about it, but I love it. The notchiness provides great feedback about gear selection, so I’m confident of every shift. The alignment combined with the somewhat firm suspension means the steering is quick and responsive, and the wheel communicative about the road surface. Of course, this communication is dependent on the tires, as well. Some tires provide a better quality ride and mute the feedback, just a bit, while others provide details about every little bump and scratch on the road surface. I prefer the latter – my spine can take the jarring, I want to know exactly what’s under me!

It’s that responsiveness, that twitchiness, that on-edge behavior that makes the car so much fun. Even when you’re well under the handling limits, the car provides huge amounts of information about what’s going on, and a quick flick here or there causes a lively, invigorating response.

By equiraptor on 21 September 2009 | MX-5 | A comment?
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