I need some help from the seasoned racers on how to use the 1/8 time to calculate a ballpark figure for the 1/4.

The online calculaters I've used are very inconsistent, so I need a few of you to chime in and read between the lines.

First time at the track in 20+ years, probably 245+ fully geared.
1/8 mile...15 ft above sea level...87+ degrees...61+% humidity.
Did 10 runs in about 2 hours....first 5 were tossed, skipped the bleach box, left sideways off the line and spun throught the first 3 gears all runs...my buddys Max ran fine.
Switched bikes and I hooked up with his and he had the same probs riding mine.

Next 5 runs, a lot more action on the track so maybe more rubber layed down? Changed my strategy (forget treadwear)went through the box and smoked up the tires (now I have NO tread left) , and a whole different story...hooked up and stayed straight off the line, broke loose a bit(but still straight) about 15-20 feet out, then hooked up going into second, all good runs.

Don't have a scanner, so just #'s: Best runs....
1 2 3 4 Busa
Reaction Time: .415 .499 .413 .483 .821
60 foot time: 1.887 1.988 1.839 1.957 1.871
MPH: 96.1 97.8 84.1 95.3 111.1
ET: 7.542 7.560 7.515 7.623 6.817
RL RL

Run 3 was a redlight, and missed 3rd, went through in 2nd.
Run 4 was against the Busa...lowered, extended swingarm, air shifter, Nos not used, first time with slicks.
Dawm that thing was fast after the 60.

I figure to get to lowwww 11's I need to get the MPH over 100 and the ET to low 7's. Getting the 60 down will be hard, because we just can't hook up.

I just want a ballpark figure from these times if possible, but I know they will get a bit better.

Oh Yea...this is a GEN 1 Max with just a slip-on and lowered.

Thanks,
Chris

You gotta heat that tire & I mean HEAT it, to get the traction you need for launch. 60ft's gotta get better.

I don't think you can accurately because every bike is different for the second 1/8th mile. The best you could do is a range depending on bike and tune.

Mark
#1098

That 6.8 run would have put you in the mid to high 10's. Lower your tire pressure to about 18 to 20 psi. Heat the tire. Roll it side to side to clean it off and heat the whole tire. You don't have to sit there forever like and idiot. 10 to 15 seconds for the whole precess is plenty.

Typically - A 6.5 Eigth delivers a 10.0 Quarter - 7.0 = 11.0 and a 6.0 around a 9.0. Lots of variables - i.e. how quick out of the hole verses how much MPH on top end can also effect the eight to quarter ratio. I think my numbers are pretty much in the ball apark though.

Thanks for the replys.

So it sounds like MPH in the second half of the 1/4 can make a difference even if the 1/8 #'s are'nt that great?

Does it make a difference later in the day after more cars make passes? The track was real slippery at the start (first hour)then it seemed to hook up more.

I was going to try not to launch as hard, but I would think that would affect the 60 time?

Thanks,
Chris

Cruzin wrote:
Most all of your run is done by the 330. From there you are just along for the ride. About a 25mph gain from the 1/8 to the 1/4 is pretty tipical, unless you are spraying or have a turbo. Loose some air out of the tire and make sure you are in the groove and stay in the groove. If you are running after street cars that is the worst!! All they do is rip the VHT of the track and make it slick for everyone. They should have the bike running after the cars with slicks.

Which groove?
I try to stay where all the rubbers at.
What I also don't understand, on one of the runs, I ran a 120ci beefed up Harley, and he had me from go....my reaction time was better, but he was gone....the 60 times was about 1.93 for him and 2.11 for me (Iwas riding my buddies Max for the first time)
but I caught him at the traps for the win....8.28 @87mph for him and 8.277@ 93mph for me, and I closed pretty fast,
so if I have 2 more gears 3rd and 4th for the last 1/8, should I only pick up 25 mph?

Just a question, not doubting you.
Thanks,
Chris

Thanks,
Chris

Yes stay in the tire groove. Try your best to pick a spot at the line that isn't bare. With the slower 8 second time you would probably only pick up another 20mph from the 1/8 to the 1/4. Lot of factors determine your final MPH. Don't worry so much about that. You want ET.

That 8.27 is really slow for a 120ci Harley. I beat that time on a stock Buell lightning.

ET it is!!!!

Yes, most of the bikes without slicks were slip sliding all over the place too the 60.....like I said the first couple runs I didn't hook up till I hit 3rd, just past the 60, it was like a skating rink out there but the track started getting sticker about an 1/2 hour....after more cars showed up, and I did start warming up the tire.
That run with the Hog was about the 5th run, and the track was only open for 35 minutes.

Thanks,
Chris