Competition trap speed calculators math.

[JasonCzerak]

so I'm searching around and I come across something unrelated to my original search but interesting non the less.



http://www.ajdesigner.com/phphorsepower/horsepower_equation_trap_speed_method_horsepower.php



put in 7000#'s

99mph trap



and it tells me I need 530hp to do that.



How many people have dyno'ed on a real good load dyno a number and have the that HP number match a trap speed at the track? or even come with in 2mph and 50hp of those numbers?



Even at 97mph it's 498hp. 95 = 460



I have to get to a 1/4 mile track before it's to cold!



I do realize the dyno's I've been on have been to light (rollers) to even put a good sized load on my stock turbo's truck. but 420hp only? that's like 100hp off assuming I can manage 99mph in a 1/4 (something the edge box said I could do... )

 

[WCounts]

The calculator I use is very accurate. I put in 7200lbs @ 103. 67mph and came up with 540hp.

Dynoed the truck last sat and got 538. 8hp

 

[Highfinance97]

7000lbs @97MPH=498 horse

I did that with the mods i had 2 years ago, and when it was on the dyno(Dynojet) :{ i did about 450 horse back then.





Michael

 

[gitchesum]

By that calculator, I should be putting anywhere from 544 to 567HP down.



With just a Smarty and a TST, and a built transmission, I'd be suprised to see that kind of number pop up on the dyno.

 

[Dockboy]

so I'm searching around and I come across something unrelated to my original search but interesting non the less.



http://www.ajdesigner.com/phphorsepower/horsepower_equation_trap_speed_method_horsepower.php



put in 7000#'s

99mph trap



and it tells me I need 530hp to do that.



How many people have dyno'ed on a real good load dyno a number and have the that HP number match a trap speed at the track? or even come with in 2mph and 50hp of those numbers?



Even at 97mph it's 498hp. 95 = 460



I have to get to a 1/4 mile track before it's to cold!



I do realize the dyno's I've been on have been to light (rollers) to even put a good sized load on my stock turbo's truck. but 420hp only? that's like 100hp off assuming I can manage 99mph in a 1/4 (something the edge box said I could do... )

The only calculator that is accurate is the www.smokemup.com calculator for HP from 1/4 trap speed.



7000lbs @ 99mph = 461 rwhp



For reference:



I just dynoed on Dunbars Dynojet at 758. 8 rwhp



smokemup says 7500lbs @ 114mph = 754. 5 rwhp

 

[Luken]

By that calculator, I should be putting anywhere from 544 to 567HP down.



With just a Smarty and a TST, and a built transmission, I'd be suprised to see that kind of number pop up on the dyno.

YOu might be surpised. TST, Crazy Larry, Built transmission, sps66 I laid down between 640-659 on 7 runs... .



The caculator put me at 669HP going 106... Not to far off.

 

[COMP461]

This is the numbers on Project X diesel,

I have a problem with this in that this doesn’t take in to account that the truck hits a speed limiter, at 1200 feet, and would gain another 3 to 4 mph,





weight = 6388 pound = 6388 pound

velocity = 118 mile/hour = 118 mile/hour



Solution: horsepower (hp) = 819. 1498520554

 

[Dockboy]

This is the numbers on Project X diesel,

I have a problem with this in that this doesn’t take in to account that the truck hits a speed limiter, at 1200 feet, and would gain another 3 to 4 mph,





weight = 6388 pound = 6388 pound

velocity = 118 mile/hour = 118 mile/hour



Solution: horsepower (hp) = 819. 1498520554

Sorry Greg!!!! :{



Smokem up says 6388lbs @ 118mph = 712. 7 rwhp :{



Even at 121 mph it only says 768. 4 rwhp

 

[COMP461]

That is more realistic, the truck did dyno at 864 but, I don’t believe we are getting it all to the track at once. I don't really believe that a inertia dyno is any thing more then a tuning aid, and once you get past a a point not relevant. David Dunbar’s dyno is very close when it comes to these trucks at this weight, and average parasitic drags formulas. We don’t even turn a tire , not even a chirp on the 11. 76 passes , this in my opinion because the progressive nitrous is smooth in coming on . I did find out after numerous calls to Dennis Perry that placement is critical in bringing on nitrous with out the flame out, I wished that Hot Rod would have allowed him to come tune and ride with us , but the rules were that you must be at the first meeting to ride along. He was confident that we had the power to put this truck in the 10’s

 

[DHawk]

Dynos Are Becoming Interesting To Me. My 05 Makes 503@1076 On A Dynojet 15 Min From My House. Dunbar's Dyno, My Truck Makes 484@982. On The Dyno At Terre Haute Extravaganza, My Truck Makes 352@888. You Tell Me, Who Is Lying. My Truck Still Goes 13. 0's 1/4, And 8. 20's-30's 1/8. How Can My Wife's Truck Run Those Times Anywhere In The Midwest On These Dynos And Be That Far Off.

Someone Isn't Right.

Dhawk

 

[JVolpe]

I love the calculators, just not sure how accurate they are.



Last week at 7225lbs, 12. 866 @ 105. 69mph. The aidesigner says 665hp.



Week before at 7235lbs, 12. 813 @ 106. 07mph. The aidesigner says 672hp.



Even if that is engine hp and not rwhp I would be very happy with those dyno numbers.

 

[Dockboy]

I love the calculators, just not sure how accurate they are.





Week before at 7235lbs, 12. 813 @ 106. 07mph. The aidesigner says 672hp.



Even if that is engine hp and not rwhp I would be very happy with those dyno numbers.

Smokemup shows 586. 3 rwhp

 

[JVolpe]

Smokemup shows 586. 3 rwhp

Ok, I am happy with that number too . Hopefully Friday the dyno will be set up at the DHRA kick off party at DI and I will know what that stack shows on a dyno.

 

[Luken]

Dockboy,



Will you run my #'s on Smokemup?



7200 pounds. Numbers in my sig.



Thanks!

 

[Dockboy]

Dockboy,



Will you run my #'s on Smokemup?



7200 pounds. Numbers in my sig.



Thanks!

7200 lbs @ 105. 91 mph = 580. 8 rwhp

 

[Turbo Thom]

DHawk... ... . if I were to put confidence any in a dyno, it would be David's dynojet. I've watched he and Mike for about 4 years with that thing, and the numbers are to close, as to what David says, to dispute.



And Greg is right on too, it's a tuning tool. Use it as such.



Just my thought's

 

[Diesel Freak]

Derived this over a year ago... pretty darn close!!!



complete aerodynamicly corrected 2nd gen 1/4 mile HP calculator





Average Horsepower for a 1/4 mile run= (0. 1095 x Vehicle Weight x Trap speed) / ET² + 75236/(ET³)



given a 5000 pound truck running a 10. 3 ET at 133 MPH, yeilds ~755 HP applied to the ground

 

[Turbo Thom]

Now Freak... ... . What the hell are those little numbers next to the letters suposed to do?

 

[JCutter]

could somebody do my #'s. 108 mph = 13. 1 sec, 1. 8 60 ft and ? on weight but its a reg cab 4x4. my last dyno was on a mustang and i feel they were low (506hp



Thanks Jeremie

 

[RacinDuallie]

Someone run these numbers- 2750lbs. - 8. 62E. T. /159mph