NHRA Elevation Correction Table

[BadStratRT]

This is very simple, and it is what the NHRA teams use to get an idea of what they will run at various tracks. To get your corrected time, simply find the track elevation and multiply your ET by the corresponding ET number, and multiply your mph by the mph column. example...at PRP the mirada ran 12.47@105.82, which is 1180 feet above sea level. So, I take 12.47*0.9874(1200 foot correction number)=12.312, and take the speed, 105.82*1.0129=107.19, and these times are estimated corrections to sea level. Again, this is by no means perfect, or set in stone, and quoting these numbers as what your car WILL RUN makes you a ricer... Also, keep in mind that things like barometric pressure, humidity, and air pressure all play a big role. Altitude above Sea Level (Feet) Elapsed Time Factor (ET) Trap Speed Factor (MPH) feet ET mph ----------------------- 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

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[moparmanjames]

I likegetting thedensity altitude then using the NHRA table, it's much closer.

[BadStratRT]

i agree, but not many part time racers are going to be able to get that, unless the track list it on the timeslip.

[moparmanjames]

True, I just wanted to put the info out there so these guys could look into it.