Bike Night

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Bike Night

Post  V17R on Sat 08 Nov 2014, 6:46 pm

http://www.sydneydragway.com.au/events/bike-night-2/

I'm going next Thursday, went a few months ago definitely good fun
will see if secondary removal really makes a difference or not
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Re: Bike Night

Post  V17R on Wed 12 Nov 2014, 10:07 pm

I guess no ones interested?
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Re: Bike Night

Post  2wheelsagain on Thu 13 Nov 2014, 6:38 am

I wouldn't be thinking that mate. 
There's a few on here who have dragged their bikes before. 
I'll be interested if it makes no difference to the times. Removing secondaries won't settle any argument for me.

Good luck and post your times.

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Re: Bike Night

Post  V17R on Fri 14 Nov 2014, 10:22 pm

I went to Sydney Dragway last night
before removing secondaries the bike ran 12.35 sec @ 114mph (184 kph)
no other changes to bike, time dropped to 11.72 sec @117.9mph (189 kph)  

big improvement for no expense
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Re: Bike Night

Post  Kiwisteve on Sat 15 Nov 2014, 6:10 am

Sounds fair. Now drop off your centre stand & anything else that weighs a ton before you have another go

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Re: Bike Night

Post  paul on Sat 15 Nov 2014, 9:26 am

That's quite a difference  Very Happy

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Re: Bike Night

Post  barry_mcki on Sat 15 Nov 2014, 9:54 am

If the quick and dirty ET Calculator I've used is correct, assuming a rider weight of 85kg, that's between 8.6 and 12.1 hp increase. What was the 60' times ?  

I think some of the improvement might be your reaction time and knowing the bike a bit better since the last run, but still a pretty good improvement.

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Re: Bike Night

Post  V17R on Sat 15 Nov 2014, 12:44 pm

60' was 2.0
you are right about knowing the bike better but most especially the terminal speed is due to increased HP 

reaction time does not effect your ET as the timers start when you break the beam
eg: two different runs, say one the first run you have a .10 reaction time and the bike runs 12.0 ET
second run your sit on the line after the tree goes green for 2 secs then your reaction time is 2 secs but the bike runs the same 12.0 ET

you have still run 12.0 seconds as the two timers are completely separate, low reaction times are really only useful in completion where competition is close
and a quicker reaction time will give you the win over another opponent  running the same Elapsed Time (ET) but with a slower reaction time

eg both run identical 12.00 secs ET but lane 1 has a R/T of .10 and lane 2 has a R/T of .30
Lane 1 wins by .20 (2/10th's)
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Re: Bike Night

Post  barry_mcki on Sat 15 Nov 2014, 1:11 pm

What was the other run 60', this difference should indicate how your launch has improved, if there is no difference then it's all hp  cheers  A slower 60' could be too much hp for your back tyre, tyre smoke is inversely proportional to ET  Sad

Do you soften your rear suspension ?  I remember on our weekend drag car we used to run soft shocks on the rear and a 25/75 setup on the front to allow it to eaisly lift but come down slower thus putting more weight on the rear end during the launch.

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Re: Bike Night

Post  V17R on Sat 15 Nov 2014, 2:27 pm

previous was 2.3 sec range
so dropped .3 in the 60 and .6 over the 1/4 mile
your old car would have been 75/25 front shocks
my Falcon runs 90/10's in the front for the drags


out of interest what did you use to calculate hp?
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Re: Bike Night

Post  barry_mcki on Sat 15 Nov 2014, 4:04 pm

Actually I think the fronts were 90/10's now that you mention it, been a couple of years - she was a 2200kg ZJ Fairlane running an iron 460 cu in big block, C6 and 9" on LPG (1200cfm twin side draft mixers).

The ET convertor was from Wallace Racing, they have a three different calculators to find ET from weight & HP, HP from MPH & weight, and  HP from ET & weight.

I used 683 lb (310kg) for total weight (225kg for the bike and 85kg for the rider - this was the dry wright, I didn't add anything for fuel thinking you ran only enough in the tank for the race and I didn't worry about oil and other fluids weight).   As mentioned this was a quick and dirty calc as you'll see if you plug in the numbers (they are a fair way of what the dyno's are saying), and are inconsistented depending on what calculator you use, but they definately shows a hp improvement.

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Re: Bike Night

Post  V17R on Sat 15 Nov 2014, 5:55 pm

I weighed the bike at the track 246kg with about 1/4 tank
I'd be about 85kg with gear, so your bang on the money
Fairlane would have been cool, what did it run with that setup?
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Re: Bike Night

Post  barry_mcki on Sat 15 Nov 2014, 6:46 pm



We ran mid 13's as long as we kept her cool enough, but she was a very heavy car weighing in at over 2200kg after all the additions were tallied up.

She was fun, fully street registered in the ACT, not picked for a thing when it was put over the pits after the 460 went in - helps having a ACT copper sitting in the passenger seat.  Completely changed all sheet metal to FE LTD as well as dash and all interior, only original ZJ parts were the headlining and Borg Warner LSD axles and rear discs (axles fitted a 28 spine 9" centre).  Ran pretty good considering her weight (she put on an additional 400kg with the bigger motor, trans and diff, as well as the all electric seats and doors).  Had a 4.11 9" centre with mini-spool in a Lincoln housing that was cut and shut to accept BW tubes and disc brakes, a 3500 stall and manualised C6.  Looked pretty sleepy except for being a tad lowered. Spent a fortune on her (well over $40k not counting the original car which was a factory 351 FMX) - sold for $10k when we came to Tassie.  Very thirsty with the cam she had, 80lts of LPG got about 120km - that's 66lt/100km or 4.3 mpg in the old money, needless to say it didn't go on too many long trips Very Happy

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Re: Bike Night

Post  V17R on Sat 15 Nov 2014, 7:20 pm

that would have been a fun car, how long ago was that.
mid 13's is a strong street car especially on gas 
where did you run it?
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Re: Bike Night

Post  barry_mcki on Sat 15 Nov 2014, 9:13 pm

The old old Canberra track, then the 1/8th mile for a little while.  They never did re-open it, then with Eastern Creek that was the end of legal Canberra drags.

With the manualised C6 we had a B&M ratchet shifter, sometimes I just left it in top gear and could still take off from traffic lights faster than most new cars. The main issue with this beast was the fuel gauge being linked to the tacho Cool

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Re: Bike Night

Post  V17R on Sat 15 Nov 2014, 9:21 pm

I probably saw the car if it was at the old 1/4 mile track
used to run my Falcon there after Castlereagh closed
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