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How can faster 60' times mean lower MPH?
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10-10-2008, 11:52 AM | #1 |
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How can faster 60' times mean lower MPH?
I love going to the track but I'm horrible in math, can someone explain how a faster 60' time results in a slower MPH at the end of the 1/4 mile?
Here are my results at my last track event 1st run 2.02 60' @12.52 @ 113mph 2nd run 1.7 60' @ 12.55 @ 111mph How does this work? TIA Mario
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10-10-2008, 12:15 PM | #2 |
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i am no expert but i would guess traction vs power.
having slightly less power will give you better traction for the 0-60 but decrease trap speed. having slighly more power will give you higher trap speed but may decrease traction for the 0-60. |
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10-10-2008, 12:22 PM | #3 | |
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15' YMB M4, TC Kline ℅ camber plates, AWE Exhaust 544whp Stage 1 Map. Past E90 335iA BLK/BLK 19" IForged Daytona, UR Intake, JB3 2.0, RR DP, AA intercooler, HKS BOV, KWV2, 424whp
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10-10-2008, 12:25 PM | #4 |
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The OP is tallking about the same car with the same power. It is true that a lower 60' usually leads to a better ET, but a slower mph. I have yet to hear a really nice explanation of why this occurs..
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10-10-2008, 12:42 PM | #5 |
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how long in between runs>?
if you don't give enough time between runs you will be slower with each pass. nothing sucks the performance out of a motor like heat. btw: nice 1.7 launch...keep it up!!! |
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10-10-2008, 12:46 PM | #6 |
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The lower the 60' time with a stock car the faster you will cross the line before getting up to full speed. If it is the same car and you increase your 60' time chances are you won't need as much speed to pass the 1/4 mile line.
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10-10-2008, 12:47 PM | #7 | |
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15' YMB M4, TC Kline ℅ camber plates, AWE Exhaust 544whp Stage 1 Map. Past E90 335iA BLK/BLK 19" IForged Daytona, UR Intake, JB3 2.0, RR DP, AA intercooler, HKS BOV, KWV2, 424whp
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10-10-2008, 12:53 PM | #8 |
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Think of it graphically.
A-----------------------finish B----------------------finish B is ahead due to the quicker time so I would assume he doesn't need as much speed to cross the line as A would. Just my two cents.
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10-10-2008, 01:59 PM | #9 | ||
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it's all about finding that 'efficiency range' for 60ft times that will yield optimal trap speeds.
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10-10-2008, 02:23 PM | #11 | |
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10-10-2008, 03:01 PM | #12 |
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You can also lose time in shifts down the line. Don't know if you drive an auto or not, but letting the car automatically shift at redline vs. manually shifting the auto at ~6000rpm can result in a lower speed at the end. It is not going to make much difference in the shift from 1-2, but will in the higher gears. Because of this, you might see the same 0-60 time where the trap speed is slower letting the car auto shift at redline. Same deal will work with a manual too.
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10-10-2008, 03:03 PM | #13 |
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Not entirely sure, but great times though!
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10-10-2008, 03:14 PM | #14 |
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correct me if i'm wrong, but
lower 60foot = lower ET lower ET = less time to develop speed therefore, ceterus paribus, lower 60 foot = less speed
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10-10-2008, 03:21 PM | #15 |
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Makes sense.
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10-10-2008, 05:08 PM | #16 | |
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Even if you trapped slower on the second run you still should have posted a roughly 12.2x run if the 60ft was 3 tenths faster and everything else was the same. If you looked at the 1/8th mi numbers and noticed that your car was 90mph in the 1/8th on the 113mph 1/4 and then 88mph 1/8th on the 111mph 1/4 you'd know you gave up some power in the first half of the track. If it all happened at the end of the track, different factors could have contributed to it such as a high water temp or air temp pulling timing for example. Post up the whole timeslip (numbers not scan) so we can take a look at it. Great times regardless though!
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10-10-2008, 07:29 PM | #18 | |
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15' YMB M4, TC Kline ℅ camber plates, AWE Exhaust 544whp Stage 1 Map. Past E90 335iA BLK/BLK 19" IForged Daytona, UR Intake, JB3 2.0, RR DP, AA intercooler, HKS BOV, KWV2, 424whp
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10-10-2008, 07:30 PM | #19 | |
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I know I have at least one of the time slips, but I will look for them so I scan them
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15' YMB M4, TC Kline ℅ camber plates, AWE Exhaust 544whp Stage 1 Map. Past E90 335iA BLK/BLK 19" IForged Daytona, UR Intake, JB3 2.0, RR DP, AA intercooler, HKS BOV, KWV2, 424whp
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10-10-2008, 08:34 PM | #20 |
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i don't think you would be getting up to speed quicker. at least not necessarily. you're just wasting less time at the starting line by not spinning tires or bogging. but to keep from spinning, you're also not putting down as much power.
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10-11-2008, 12:40 AM | #21 |
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My trap speed went up with DRs. when the 60' time went down.
On DRs 12.133 1.729 113.49mph 12.261 1.80 112.40mph On Stock RFT 12.633 2.00 111.22 mph
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10-11-2008, 01:06 AM | #22 |
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because if you spin your tires more, you leave the line at a higher rate of speed and therefore in your 1/4 of a mile stretch you go from say 20mph-110 or with more spin you might go from 25-112
that is what I have always thought. |
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