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post #1 of 22 (permalink) Old 05-25-2005, 08:44 PM Thread Starter
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check out this ET/TRAP SPEED calculator

Plug in your numbers and tell us how accurate they compare to your actual times.

http://rx7.com/accel_calculator.html

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post #2 of 22 (permalink) Old 05-25-2005, 09:03 PM
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LOL at least 3/4 of a second off on every vehicle I plugged into it.
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post #3 of 22 (permalink) Old 05-25-2005, 09:05 PM Thread Starter
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Quote:
Originally Posted by kdanner
LOL at least 3/4 of a second off on every vehicle I plugged into it.
slower or faster?

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post #4 of 22 (permalink) Old 05-25-2005, 09:11 PM
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had me at .3 faster than actual
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post #5 of 22 (permalink) Old 05-25-2005, 09:20 PM
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Why doesn't either the trap speed or the ET vary with tire height? I messed around with sizes between 27 and 20" and the only thing that changes is the trap RPM. Shouldn't tire height have some sort of effect on the numbers?

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post #6 of 22 (permalink) Old 05-25-2005, 09:24 PM Thread Starter
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Quote:
Originally Posted by 95LX
Why doesn't either the trap speed or the ET vary with tire height? I messed around with sizes between 27 and 20" and the only thing that changes is the trap RPM. Shouldn't tire height have some sort of effect on the numbers?

Jim
yeah I agree, the extra mass of a bigger tire should definitly slow your ET down... also the "gear" size doesnt effect the ET either... just rpm

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post #7 of 22 (permalink) Old 05-25-2005, 09:54 PM
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I was leaning towards a shorter tire acting as a steeper set of gears rather than affecting the numbers due to the weight differences.

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post #8 of 22 (permalink) Old 05-25-2005, 09:56 PM
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Hmm. Not bad for guesstimating i guess. Said I should trap at [email protected] We'll see how accuate it is later.

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post #9 of 22 (permalink) Old 05-25-2005, 10:10 PM
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With me guessing at my horsepower, it put me .3 seconds slower and 5 miles per hour slower.

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post #10 of 22 (permalink) Old 05-25-2005, 10:58 PM
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The number of shifts thing just adds 2 tenths for each shift you have. Does that seem right? .4 seconds just for shifting? Seems long to me.

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post #11 of 22 (permalink) Old 05-26-2005, 12:31 AM Thread Starter
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Quote:
Originally Posted by Sir William
The number of shifts thing just adds 2 tenths for each shift you have. Does that seem right? .4 seconds just for shifting? Seems long to me.
2 tenths might be accurate for a manual shift.

It is hard to get a VERY accurate reading if we dont know our exact dyno rear wheel hp... and a stall converter alone can drop your ET by 5 tenths... it would be great if they could add rpm launch speed.... or ... since this is an rx7 site im assuming they are calculating for a manual tranny launch.... so for those that dont have a stall converter maybe can add about 3-5 tenths... hmmm

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Last edited by awdRocks; 05-26-2005 at 12:42 AM.
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post #12 of 22 (permalink) Old 05-26-2005, 07:44 AM
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Dynos don't factor in gearing or stall. If you can get the same power to the ground quicker than someone else, you are going to be faster than someone else.

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post #13 of 22 (permalink) Old 05-26-2005, 07:50 AM
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off by a tenth and over 3mph... not all that great.

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post #14 of 22 (permalink) Old 05-26-2005, 07:56 AM
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6 tenths and 5 mph here. heh

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post #15 of 22 (permalink) Old 05-26-2005, 02:05 PM
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[email protected] with an estimated 240RWHP

I don't think it's accurate, I don't think I'm down in the 14's quite yet. Even at sea level.

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post #16 of 22 (permalink) Old 05-26-2005, 07:32 PM
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with me guess at my horsepwoer it had me at 13.45 @ 98.5 my actual best was 13.75 @ 101.72

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post #17 of 22 (permalink) Old 05-26-2005, 10:56 PM
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it gave me a 15.9 for the tbird, which is right on the dot.

gave me a 13.2 for the dsm. now i really cant wait till track day.

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post #18 of 22 (permalink) Old 05-26-2005, 11:03 PM
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was the other thread locked or something? *goes to check*


yep, figures...

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post #19 of 22 (permalink) Old 05-26-2005, 11:18 PM
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15.79 @ 83.69

actually running:
15.18 @ 91.18

yeah, just a ~hair~ off....

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post #20 of 22 (permalink) Old 05-26-2005, 11:47 PM
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Yes most rx7s are five speeds and most cars gears are set up so you wont even hit fourth gear before the end of teh track

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post #21 of 22 (permalink) Old 05-27-2005, 04:14 PM
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14.88 @ 91.27 compared to my actual 14.43 @ 96.05....If it didn't figure .2 for every shift it'd be a lot more accurate. Hell...I even grab rubber 2-3 a lot of the time now

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post #22 of 22 (permalink) Old 05-27-2005, 04:36 PM Thread Starter
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well at least it seems that everyones times who are off are quicker than what the calculate measures.... i like that... if im even as quick as it says I will be very happy!!!

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