Too much gas at the strip?
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E55
Too much gas at the strip?
How much can too much gas slow you down? I had 3/4 of a tank of gas and the best time that I coudl run was a 12.1 at 115mph. A few weeks back I ran a 12.1 at 120 mph. My 60 ft was better this time at 1.799 vs. a 1.956 when I ran a 12.1mph at 120mph. Could it be due to too much fuel? I am thinking that the extra gas helped me get off the line better, but slowed me down at the top end. Any thoughts? 
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From: Sugar Land, TX
BMW E39
If that extra bit of gas, which I somewhat doubt, gave you extra traction, then yes, that probably was a major factor in getting your better 60' time. If you don't have traction problems even with a near empty tank, then the gas wasn't a factor.
It shouldn't affect top end too much though. If any, extra weight should lower your 60' time.
It shouldn't affect top end too much though. If any, extra weight should lower your 60' time.
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From: Covington wa
05 SL500, 02 BMW Z3 (Mrs. VF), 05 FJR1300, 91 ZX-11
F=ma - so yes, gas can affect your times. at roughly 7 lbs per gallon, an extra 10 gallons = 70 lbs to get moving down the track.
Would 70 lbs have enough effect to change your 60 ft times by that much? probably not.
Were the weather conditions the same? Track temperature, air temperature (density) etc probably have more to do with it.
Would 70 lbs have enough effect to change your 60 ft times by that much? probably not.
Were the weather conditions the same? Track temperature, air temperature (density) etc probably have more to do with it.
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From: Central FL
2006 E55
I ran a best time of 12.57 with around a 1/4 tank of gas. I have just over 200 Lbs of stereo equipment in my trunk which I thought it might help with traction on launch, but it definitely slowed me down. It's like going down the track with a passenger. Has anyone run the 1/4 with a passenger along for the ride if the track allowed? If so, what kind of time did you get?
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E55
Originally Posted by velvet fog
F=ma - so yes, gas can affect your times. at roughly 7 lbs per gallon, an extra 10 gallons = 70 lbs to get moving down the track.
Would 70 lbs have enough effect to change your 60 ft times by that much? probably not.
Were the weather conditions the same? Track temperature, air temperature (density) etc probably have more to do with it.
Would 70 lbs have enough effect to change your 60 ft times by that much? probably not.
Were the weather conditions the same? Track temperature, air temperature (density) etc probably have more to do with it.
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Originally Posted by MB_Steve
How much can too much gas slow you down? I had 3/4 of a tank of gas and the best time that I coudl run was a 12.1 at 115mph. A few weeks back I ran a 12.1 at 120 mph. My 60 ft was better this time at 1.799 vs. a 1.956 when I ran a 12.1mph at 120mph. Could it be due to too much fuel? I am thinking that the extra gas helped me get off the line better, but slowed me down at the top end. Any thoughts?
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From: South Florida
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extra fuel wouldn't account for a 120 to 115 trap speed drop... that's about 50HP..... extra gas/weight, and the warmer weather could account for a good part of that though.... how many times did you run? could also be a timing error....
Originally Posted by MB_Steve
How much can too much gas slow you down? I had 3/4 of a tank of gas and the best time that I coudl run was a 12.1 at 115mph. A few weeks back I ran a 12.1 at 120 mph. My 60 ft was better this time at 1.799 vs. a 1.956 when I ran a 12.1mph at 120mph. Could it be due to too much fuel? I am thinking that the extra gas helped me get off the line better, but slowed me down at the top end. Any thoughts?
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From: Madison, WI
04 CL600
Originally Posted by Fikse
extra fuel wouldn't account for a 120 to 115 trap speed drop... that's about 50HP..... extra gas/weight, and the warmer weather could account for a good part of that though.... how many times did you run? could also be a timing error....
BTW does octane additive help or hurt?
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E55
[QUOTE=Fikse]extra fuel wouldn't account for a 120 to 115 trap speed drop... that's about 50HP..... extra gas/weight, and the warmer weather could account for a good part of that though.... how many times did you run? could also be a timing error....[/QUOTE
My first time to the track (ever) I ran a 12.6 1/4 mile. Wheels spun off the line badly. But my trap speed was 116 mph. The same day, my next run was a 12.1 with a 120 mph trap speed. So if I was able to run a 12.6 with a 116 mph trap speed, how could I run a 12.1 with 115 mph trap speed. Seems to me like my car is slower at the bottom end. Off the line it was quicker this time around, but my trap speed was much lower. Next time I will run with much less gas to see what happens. Either that or my car has slowed down tremendously.
My first time to the track (ever) I ran a 12.6 1/4 mile. Wheels spun off the line badly. But my trap speed was 116 mph. The same day, my next run was a 12.1 with a 120 mph trap speed. So if I was able to run a 12.6 with a 116 mph trap speed, how could I run a 12.1 with 115 mph trap speed. Seems to me like my car is slower at the bottom end. Off the line it was quicker this time around, but my trap speed was much lower. Next time I will run with much less gas to see what happens. Either that or my car has slowed down tremendously.
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From: South Florida
STS,FGT,12C,P85D,M4
not sure what your mods are, so I'm not sure what your car should be running... if you pulled 120MPH, I would guess you have a pulley and ecu...
trap speeds will stay pretty consistant if you get a good or bad launch....
I ran 12.07 @ 116 stock... so 12.1 @ 115 is right in line....
My first time to the track (ever) I ran a 12.6 1/4 mile. Wheels spun off the line badly. But my trap speed was 116 mph. The same day, my next run was a 12.1 with a 120 mph trap speed. So if I was able to run a 12.6 with a 116 mph trap speed, how could I run a 12.1 with 115 mph trap speed. Seems to me like my car is slower at the bottom end. Off the line it was quicker this time around, but my trap speed was much lower. Next time I will run with much less gas to see what happens. Either that or my car has slowed down tremendously.
trap speeds will stay pretty consistant if you get a good or bad launch....
I ran 12.07 @ 116 stock... so 12.1 @ 115 is right in line....
Originally Posted by MB_Steve
My first time to the track (ever) I ran a 12.6 1/4 mile. Wheels spun off the line badly. But my trap speed was 116 mph. The same day, my next run was a 12.1 with a 120 mph trap speed. So if I was able to run a 12.6 with a 116 mph trap speed, how could I run a 12.1 with 115 mph trap speed. Seems to me like my car is slower at the bottom end. Off the line it was quicker this time around, but my trap speed was much lower. Next time I will run with much less gas to see what happens. Either that or my car has slowed down tremendously.
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E55
Originally Posted by Fikse
not sure what your mods are, so I'm not sure what your car should be running... if you pulled 120MPH, I would guess you have a pulley and ecu...
trap speeds will stay pretty consistant if you get a good or bad launch....
I ran 12.07 @ 116 stock... so 12.1 @ 115 is right in line....
trap speeds will stay pretty consistant if you get a good or bad launch....
I ran 12.07 @ 116 stock... so 12.1 @ 115 is right in line....
