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Author Topic: Launch Me  (Read 2783 times)
triangleforge
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« on: February 16, 2012, 07:53:44 AM »

One of the things I love about the high school where I'm teaching: I get to cap off a week of work in my math class on cars, transportation & internal combustion with a Friday night class field trip down to a Phoenix-area drag strip and "gather data" for us to use in class later. The school principal is prepping a couple of her cars & will be giving students a chance to ride along on timed runs.

I'd like to take the ST2 down and run it, which will highlight one of the weakest weapons in my admittedly small arsenal of high-performance skills: a hard launch.

School me on how to get off the line quickly, safely & without breaking anything (much - the clutch pack is probably within a few thousand miles of done, so I'm not too worried about speeding its demise).
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« Reply #1 on: February 16, 2012, 07:59:43 AM »

1st question...how is your throttle control with wheelies?...that comfort and familiarity will come into play somewhat with dragstrip launching....
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triangleforge
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« Reply #2 on: February 16, 2012, 08:59:18 AM »

I'd say average to below average; that said, I've actually tried to get the ST2 to wheelie, and can't say I've done more than extend the fork.
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pennyrobber
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« Reply #3 on: February 16, 2012, 09:15:04 AM »

We've ran down at Firebird a few times. Pretty fun to see what the old girl will run in a strait line. I am by no means great at launching but I my technique was to lean forward waiting for the light. I keep my left foot on the peg so I'm not searching for it and can also keep from sliding back in the seat too much. Clutch is right at friction point and engine rev's held at about 3000. As the last yellow light flashes, start smoothly letting out the clutch while smoothly but quickly opening throttle all the way. The trick is to let the clutch slip enough to keep engine revs up and the front wheel down. Then it's just throttle pinned and the occasional blip of the throttle to clutchless up shift.
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triangleforge
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« Reply #4 on: February 17, 2012, 09:48:44 AM »

Thanks, Pennyrobber! We'll be at Speedworld in Wittman (between Phoenix & Wickenburg - http://speedworlddragstrip.com/site/) for the Friday, March 2 "Test n' Tune" evening if you'd like to come join the fun.
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« Reply #5 on: February 26, 2012, 08:04:43 PM »

so....

how did it go?

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« Reply #6 on: February 27, 2012, 06:52:59 AM »

+1 

Time slips???

I wish I could go play but I moved from the valley last year.
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triangleforge
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« Reply #7 on: February 27, 2012, 08:20:54 AM »

It's scheduled for this Friday; because it conflicts with another event at school (a fundraising dinner for a group of kids heading for overseas study in Costa Rica - this, if you hadn't got the picture, is one cool school!), I've lost about 30% of my class for the trip. When I asked the principal, she replied that if the group gets too small to make it worth the time & gas I should cancel ... and then all us "old farts" should head down without the kids anyway.  Smiley

I've been practicing starts on an isolated stretch of road south of here; the first few tries were mighty ragged. I'm getting smoother but there's still a huge amount of potential acceleration I'm leaving on the table. I'm also working on clutchless upshifting; at this point, I'm not consistent enough to rely on it when the clock is ticking, but we'll see if I can improve a bit more before Friday.

I'll post up timeslips after the event - good, bad, or ugly...

In other news, I threaded my bike through the narrow doors & down the hallways at the school yesterday and parked it in the middle of my classroom. Today's lesson plan is a brainstorming session on how (using math) to make the bike Faster/More Fuel Efficient/Safer. I'm hoping to use the bike as a visual aid and discussion center get them thinking and speaking in terms of geometry, algebra and ratios... And if they start seeing the point of calculus and the higher math that I've scrupulously avoided throughout my own education, so much the better.
« Last Edit: February 27, 2012, 08:33:34 AM by triangleforge » Logged

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« Reply #8 on: February 27, 2012, 09:16:45 AM »

i once read an interview w/ ricky gadson regarding his drag launches.

in short, he holds rpms at peak torque with the clutch at the edge of the friction point and then progressively (but quickly) let's the clutch out and then gets to full throttle.

the idea is to let the clutch out and get to full throttle as quickly as possible with (little or) no front wheel lift.

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« Reply #9 on: February 28, 2012, 02:58:57 AM »

It looks almost like he's done that before Cheesy
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triangleforge
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« Reply #10 on: March 05, 2012, 09:29:43 AM »

As promised, here's a quick rundown on my first attempts at quarter mile racing. Most important, I had a lot of fun & learned a few things. I'm looking forward to trying it again sometime.

Four of us - Geneva (the principal at my school), her husband Mike, Ann-Marie & I - trailered two bikes (our ST2 and their Yamaha FZ6) down the hill to the Speedworld Drag Strip, just a little Northwest of Phoenix, AZ. They drove the trailer, and I drove their Honda Civic Si, which they wanted to run - it's a fun little car in a 6-speed manual!

We arrived, paid our money, suited up and rode over to tech inspection. The inspector asked me, of course, what was that god-awful noise, and I got to explain Duc dry clutches to him. Mike and I staged and, before I knew it, there was a green light in my face. Slow start, modest acceleration in the middle, then I slowed before the finish - the course itself was well lit, but there was this yawning blackness just past the finish and I had no idea how fast I'd have to slow down. (Right lane, 14.09 @ 85.21 mph)



Lined up for a second run & wound up paired with a young guy in a tuner Honda Civic. Got a better start and an OK drive through the finish. (Left lane, 12.99 - ok, 13.00 if rounded properly - @ 104.94 mph)



Lined up for a third run with Mike and, just as we were staging, the guy in the start house stopped us and held us at the line - I was too focused on getting to the line to have seen it, but in the pair just ahead of us a Mustang had gotten loose off the line, made it about an eighth of a mile before hitting the left wall & veering across the track to T-bone the right wall. Ann-Marie & Geneva got a little jolt of adrenaline as they saw us head for the line (out of their sight) about thirty seconds before a track worker came running back saying there'd been a big crash and the track was closed to clean up. Fortunately, it wasn't us and the Mustang driver walked away, though his car was just so much scrap metal. We cooled our heels for about 45 minutes as the track workers cleaned up the mess.

It was during this break that I realized my headlight -- high & low beams -- was dead, which would explain why the two runs I'd done felt like a strobe-lit disco as I sped through the bright patches of streetlight over the track; I thought it was just the adrenaline. When the track re-opened, Geneva tossed me the keys to their Honda and told me to give a car a try. I lined up next to an elderly gentleman in a C4 Corvette, and was a bit astounded to get a good gap on him off the line. Of course, that didn't last. I discovered that the Si has a VERY hard rev limiter and my shifting was way late - so every gear change was accompanied by the car bogging down and me desperately looking for the next gear. (Right lane, 16.24 @89.62 mph)



When I got back to our cars they were calling last run, and I figured they wouldn't notice or care that I was running without a headlight. Geneva saddled up -she's been drag racing since she was 14 (mostly modded VWs) but this was her first pass on a motorcycle. We staged, launched ... and I got TOO good a start, red-lighting by just 11 ten-thousandths of a second.  bang head Still my best run of the night, though I know I could have gone a bit faster with a better drive off the line and better shift points. (Left Lane, 12.77 @ 106.43 mph)

« Last Edit: March 05, 2012, 11:16:20 AM by triangleforge » Logged

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« Reply #11 on: March 05, 2012, 03:41:47 PM »

Sounds like you guys had fun. What you mentioned about focus and the adrenaline are so true. Every time I pull up to the timing lights, I get butterflies in my stomach. It's crazy how much there's to actually think about when drag racing. I still prefer a road coarse but the drag strip is always a good time.
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