Drag question..............

[delboy]

Guys, at the moment my bike has 165 bhp and 101 ftlbs at the back wheel, with standard swinging arm. I know there are a lot of Drag racers on the org. so my question is what 1/4 mile time can I expect with 16/42 gearing

 

[delboy]

OK, truth is I am bored

 

[Revvv]

Your times depend on a lot. You're weight, ability to launch and stay in the throttle, and of course gearing.

If you are around 200lbs, aim for a 60ft time of about 1.7 with a quarter mile time in the high 9s. Your speed doesn't really matter much. Sometimes lower speeds generate better times. You will be in the high 130mph range, possibly the 140s

Good luck and have fun. Also, make sure you have a strap for the front. It will help with the launch.

 

[Hayabusa2005]

Your times depend on a lot. You're weight, ability to launch and stay in the throttle, and of course gearing.

If you are around 200lbs, aim for a 60ft time of about 1.7 with a quarter mile time in the high 9s. Your speed doesn't really matter much. Sometimes lower speeds generate better times. You will be in the high 130mph range, possibly the 140s

Good luck and have fun. Also, make sure you have a strap for the front. It will help with the launch.

Agree...a lot depends of weight and ability to shift and hold bike on straight line.

 

[BigRod1300]

So many other factors....guessing 10.0 at 138mph???

 

[Wild07]

How much experience do you have riding/dragging? I would consistently 60' in the 1.60-1.62 and run 9.95-.99 range, suited, 220ish. That was stock motor, 17/42 gear, stock arm, a strap and -2.5 links in the rear. Throw the clutch away and keep the front end straight and I would expect that thing to go low 9.90's maybe high 80's.

 

[DaCol.]

This has NOTHING to do with your question :dozingoff:, but I sure do like your GOLD VENT SCREENS

 

[Mr Bogus]

ET? 10.70-10.20's depending on YOU more than the bike.. I have watched 200hp + turbo bikes run 10.50's

no disgrace in running 10's make sure you get video or post your ET slips..

 

[Wild07]

Bogus, I agree. I blazed a PST bike last fall, cause the rider (wont name names) couldnt kickshift when she had problems with her shifter, and then couldnt keep the front end down. However, with the hp the OP is making, if he can keep the front end down, and straight, wouldnt you expect something in the .800-.90 range? As far as mph, I know my weak 151hp was trapping 138-140 with my gearing regardless of my short move. We all know MPH is a function of HP if you're in the throttle the whole pass, so I would be expecting him to be MPH'ing in the low-mid 140's, no?

 

[Mr Bogus]

I would expect low 140's, MPH is a lot easier to predict than ET on a proper setup.. HP=MPH..

Only time gearing really enters that part of the equation is if it was WAY OFF to start with.. Gearing is normally more related to ET and engine life

 

[dewie]

the track and altitude has alot to do with it. So the people running at sea level will have faster times. I have consistant 1.70 60ft and my best ET 10.4.

 

[Got-Busa?]

If you give your weight, we can give you an estimate but rider ABILITY means everything...

 

[hayabusa36]

Im with ya on the sea level for sure.

 

[Mr Bogus]

The effect of altitude is a double edge sword.. you have less air density that equals less oxygen, but it also equals less aerodynamic drag..

Here is the chart to convert your ET/MPH to sea level numbers: (multiply your ET and MPH by the correction factor at the density altitude you ran at, this is a N/A chart btw, I have a blower chart too but not many of those here ) HP loss far outweighs the aero effect but it is there..

1200 .9874 1.0129
1300 .9861 1.0143
1400 .9848 1.0157
1500 .9835 1.0171
1600 .9822 1.0185
1700 .9809 1.0199
1800 .9796 1.0213
1900 .9783 1.0227
2000 .9770 1.0241
2100 .9757 1.0255
2200 .9744 1.0269
2300 .9731 1.0283
2400 .9718 1.0297
2500 .9705 1.0311
2600 .9692 1.0325
2700 .9679 1.0339
2800 .9666 1.0353
2900 .9653 1.0367
3000 .9640 1.0381
3100 .9627 1.0395
3200 .9614 1.0409
3300 .9601 1.0423
3400 .9588 1.0437
3500 .9575 1.0451
3600 .9562 1.0465
3700 .9549 1.0479
3800 .9536 1.0493
3900 .9523 1.0507
4000 .9510 1.0521
4100 .9497 1.0535
4200 .9484 1.0549
4300 .9471 1.0563
4400 .9458 1.0577
4500 .9445 1.0591
4600 .9432 1.0605
4700 .9419 1.0619
4800 .9406 1.0633
4900 .9393 1.0647
5000 .9380 1.0661
5100 .9367 1.0675
5200 .9354 1.0689
5300 .9341 1.0703
5400 .9328 1.0717
5500 .9315 1.0731

IE: 10.40 @ 137 mph @ a density altitude of 3500'

10.40* .9575 = 9.98 ET
137* 1.0451= 140.04 mph

 

[BigRod1300]

ET? 10.70-10.20's depending on YOU more than the bike.. I have watched 200hp + turbo bikes run 10.50's

no disgrace in running 10's make sure you get video or post your ET slips..

My first year running at the drag on a bike....and I went 10.4 @ 136 with 150HP running that big 330 fatty. Like he said.....your make most the diff on what time you will run.

 

[Mr Bogus]

My first year running at the drag on a bike....and I went 10.4 @ 136 with 150HP running that big 330 fatty. Like he said.....your make most the diff on what time you will run.

seems pretty respectable for a fat tire bike (a lot of weight to turn)...

I think a lot of guys get too caught up in just going "fast" and forget that consistency is far more important. (well not as much in heads up stuff)

If I was in the points hunt, I would rather ride a slower bike that was easier to ride so i could dial in and just worry about hitting my starting line..

I like to win and so going slower can some times add up to more wins..

 

[busaonboost]

when you pass the 1320 mark that will give you your accurate speed and time. but not the other predicting factors kinda like the show pass times. How much do you weigh? what tire? have you raced before?

 

[afterhours]

10.0 on a stock wheelbase bike is good.....

sure, we have all read the magazine articles...and seen guys like "shine" ride stock bikes to low 9 second passes.

but in the real world it takes some skills, practice to get a stock wheelbase bike into the 9's consitantly.