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Author Topic: How much does heat effect 1/4 mph?  (Read 8053 times)

Offline teezy

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How much does heat effect 1/4 mph?
« on: October 05, 2011, 12:38:07 PM »
How much mph do you lose due to outside temp? Say 105 degrees vs 60 degrees?
In the begining I wanted 140's in the 1/4...
never thought it would go 140's in the 1/8


one very pissed off 1397cc we call MR ANGRY

Offline 6002abusa

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Re: How much does heat effect 1/4 mph?
« Reply #1 on: October 05, 2011, 12:42:42 PM »
I run the same mph

Offline knecum

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Re: How much does heat effect 1/4 mph?
« Reply #2 on: November 27, 2011, 08:05:18 PM »
as much as 4mph with those temps, but whats really important is the humity along with temp..thats what really kills it from the worst day to the best day you could gain as much as 7hp or more..Thats why you will go faster and quicker in Oct vs july/aug depending on your location..and elevation too!

Offline sportbikeryder

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Re: How much does heat effect 1/4 mph?
« Reply #3 on: November 27, 2011, 08:26:06 PM »
Here's another tidbit of useless info. Even though this post was presumably directed toward a NA bike, if you happen to ever run nitrous, when the temperature gets up over 100, it sometimes gets very erratic.

The "critical temperature" of Nitrous is somewhere in the 100-103 degree F range. Above teh critical temperature, the nitrous cannot be kept as a stable liquid. Seems best to actually cool the bottles before use.

Just food for thought.

Ok, back to NA talk  :-)
Any day on a motorcycle like this that ends just needing parts and labor is a good day.
4.82, 158.67mph 1/8th mile 7.350, 200.32mph 1/4 mile Riding

4.392, 176.79mph 1/8th mile  6.610, 228.15mph 1/4 mile Tuning

Offline glenn71

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Re: How much does heat effect 1/4 mph?
« Reply #4 on: November 29, 2011, 03:52:47 AM »
i use those hp calculators based on air conditions,then put those
numbers into an et calculator and sure as shit,the bike
hits the mph the calculator says is possible in those
air conditions.i saw 155mph out of a 180hp stock length
1299cc gen1,when the mph acheived needed 190hp on a -500ft
air night.i average air it normally runs 152mph.
Gen1 the original and the best
8.76@165.42mph so far

Offline badass1000

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Re: How much does heat effect 1/4 mph?
« Reply #5 on: November 30, 2011, 12:11:01 PM »
You can definalty have a 4mph swing with that temp range.  I have done 3 or 4 day events where it has gone from 55 to 100 from first thing in the mourning to highest temp of the day and back down at night.  My mph on my NA 09 busa with a stock engine and a set of 395/378 cams had a 4mph difference over those days.  track actual altitude was 2,800'.  corrected altitude ranged from 2400' to 5600' over those days.  mph went from 148 to 152.5 from worst to best conditions.
corrected altitude is what really counts.  I am hopeing to get a weather station next year.  :tu:

Offline badass1000

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Re: How much does heat effect 1/4 mph?
« Reply #6 on: November 30, 2011, 12:39:12 PM »
I just put a competition cnc ported head on my 09 busa. it already had a 1441 and web 395/378 cams along with some other things.  705lb combined bike and rider weight. I wanted to see how much it helped.  Got it done right at the end of the year so I only did one race at sea level and one at the home track at 2,800'.  I don't know what the actual corrected altitude was, but it was really humid and bad corrected altitude I was told when I went to sacramento.  sea level track or close to it.  I ran a best of a 8.88 at 158mph with a 1.48 sixty foot late one night.  Most passes were a 1.50-1.54 sixty and 8.92-8.95 at 155-157mph.
ran at the home track at 2,800'.  I wish it was a e.t. day.  I ran 3 1.51 sixtys in a row and then 3 1.53 sixtys in a row.  Not the greatest, but consistent as hell.  best of 9.013 at 154 first thing in the mourning.
9.013 @ 154
9.076 @ 153
9.084 @ 152
9.052 @ 153
9.074 @ 153.5
Then I tried a nitrous run.  havn't ran nitrous in two months and hadn't used it since I put the head on. I should have turned the nitrous down, but I left it the  same as the last time I used it.  I had to chop the throttle in first, choped it in second, rolled off and rode it out in 3rd and then full throttle.  slowest pass of the day. 9.17 @ 168.  It was fun though.  :lol:
The bike seems to make more power and wheelies alot easier in first and second, but the 1/4mph did not come up a whole lot. Maybee I exptected more.  I will have to wiat to see how it goes untill next year now.
I made 4 passes against  a 2011 busa with exhaust and stock engine. Simular combined weights, wheelbase, and sixtys.  he was 144-145mph on the same day and same time as my 153-154mph passes.
« Last Edit: November 30, 2011, 02:28:05 PM by badass1000 »

Offline glenn71

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Re: How much does heat effect 1/4 mph?
« Reply #7 on: November 30, 2011, 02:26:45 PM »
thats an easy one,check on your logger for how long you were at
full throttle on nos for the 1/4.prob 5.5-6seconds
only,progressive nos controller will help.
Gen1 the original and the best
8.76@165.42mph so far

Offline badass1000

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Re: How much does heat effect 1/4 mph?
« Reply #8 on: November 30, 2011, 02:36:15 PM »
I am useing a dyno jet wide band commander.  you can definalty see when and how long I was choping the throttle for. I didn't count up the total time on and off the throttle though.
I am spraying a 100hp shot tuned through ecu editor.  I don't use the nitrous a whole lot.  it is mainly a e.t. bike.  I just turn the nitrous on once in a while for fun.  a few times if it is a big event and I know track prep will be good I have e.t. raced the whole day on the nitrous.  I know ecu editor is not the best thing in the world for controlling the nitrous, but it works well enough.  I am spraying a 100hp shot and had it set to about the max per gear without wheelieng before the head work. I was runing high 9.1x to low 9.2's before the head work and the last time I had ran the nitrous.  at that time it would run about 8.65's at 175mph on the nitrous.  I should have backed the nitrous down before the run, but I did not.  I backed it off hopeing to get another run, but we did not get another run before the track closed.

Offline badass1000

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Re: How much does heat effect 1/4 mph?
« Reply #9 on: November 30, 2011, 02:39:24 PM »
I am changing the nitrous up a little for next year and putting a purge on it. It has a brocks alien head , stock oil pan, and all stock body work with a extended tail.  I got a dme prostreet oil pan and am going to get a v&h sidewinder or a brocks ti winder for next year.  Probably also get a light weight tank and a hays pro street clutch for next year.  Get the bike lower so I can get more power to the ground before it wheelies.  Main thing I need to work on is my sixtys.
« Last Edit: November 30, 2011, 02:43:47 PM by badass1000 »

Offline bryanclapper69

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Re: How much does heat effect 1/4 mph?
« Reply #10 on: December 08, 2011, 09:40:01 AM »
Going from nice day to hot, I have seen up to 2 tenths and 5mph loss

Offline Kirk

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Re: How much does heat effect 1/4 mph?
« Reply #11 on: December 08, 2011, 02:24:33 PM »
If you're A/F is spot-on under with certain weather conditions, it's going to run different under different weather conditions. 

I have observed ET drag racing vehicles with the A/F intentionally fat (not super fat, just not on the ragged edge), and they tend to be more consistent as the weather changes. 

For my vehicle, I just learned how the weather affected it and adjusted my dial accordingly.  It did run differently in different air, but as long as I accounted for it, I could still go enough rounds to pay the bills.
-Kirk