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Author Topic: Power+weight+time.  (Read 19953 times)

Offline gtpete

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Power+weight+time.
« on: January 09, 2019, 11:59:58 PM »
Hello everybody. Just to help me along with my build and give me something to look forward to. Can I make a pole of your FED weight and what 1/4 times you run. Thanks in advance Pete.
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dreracecar

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Re: Power+weight+time.
« Reply #1 on: January 10, 2019, 08:32:12 AM »
Weight divided by ET3 (cubed)  X 197.14 = HP

 1650# / 343 (7x7x7) = 4.81
 4.81 X 197.14 = 948 HP

  Rough terms is that is how much HP is needed to move that weight 1320' in that amount of time
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Offline gtpete

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Re: Power+weight+time.
« Reply #2 on: January 10, 2019, 09:40:28 AM »
I'm ok with the maths its just some real world numbers i'm after.
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dreracecar

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Re: Power+weight+time.
« Reply #3 on: January 10, 2019, 04:19:22 PM »
My car weighs with driver 1650# and I run in 7.0Pro index class and usually hit the number. I dont have the time or money for dyno time to get HP figures, And that about how "real world" I get
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Offline retroboy

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Re: Power+weight+time.
« Reply #4 on: January 10, 2019, 06:58:50 PM »
Not real world but the Wallace racing calculators have a simple calculator on their web page


Wallace Racing - 1/8th Mile ET/MPH/HP Calculator

Cheers
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Offline gtpete

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Re: Power+weight+time.
« Reply #5 on: January 10, 2019, 11:47:59 PM »
Thanks DRE that's what I'm after. My 140" FED weighs ### with this much horsepower and I run these times ###. Thanks again.
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Offline noslin

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Re: Power+weight+time.
« Reply #6 on: January 11, 2019, 05:11:43 PM »
need mph and weight for HP on the dream wheel. mph is the key.
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Offline gtpete

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Re: Power+weight+time.
« Reply #7 on: January 17, 2019, 01:07:59 PM »
Nobody else with the specs of their FED ??
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Offline Paul New

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Re: Power+weight+time.
« Reply #8 on: January 17, 2019, 01:17:54 PM »
1800lbs w/driver 387” SBC 6.47 214mph
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Offline Curly1

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Re: Power+weight+time.
« Reply #9 on: January 18, 2019, 09:33:24 AM »
4.92 @ 140 with 760 hp and 1800 lbs.
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Offline gtpete

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Re: Power+weight+time.
« Reply #10 on: January 18, 2019, 10:24:33 AM »
That's some quick cars. Both 1800 lbs too. Thanks for the replies looking forward to some more  :)
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Offline JrFuel Hayden

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Re: Power+weight+time.
« Reply #11 on: January 19, 2019, 01:46:37 AM »
We race NHRA Heritage  JrFuel for 17 years same car was 200" WB when first built by Dave Tuttle in 1998, and we front half the chassis in 2011 when tried an early Hemi and went to 225", max WB for the class.
Car with driver weighs 1435 with the SBC, and 1500 with Hemi . We run mostly 7.00's in the 1/4, and 4.45's in the 1/8 at 153-155mph, and 1/4 speed is 186-190. Class limits are only pure alky, 12"wide tires , powerglide, all iron engine,  stack injectors all at 3 1/2 lb per CI. Our engine location is 48" from back of engine to center of rear axle. The cars being built lately are 55-60" out. CI limit for JF is 430, we run 409 on the Hemi, and 400 on the SBC., but some teams run 387 ci SBC. One option we have in JF is we can also race NHRA Comp Elim, in A/ND [JFA] or B/ND [ JFB]
Call if you have more ??'s 805-444-4489, Jon
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Jon C. Hansen

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Offline George

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Re: Power+weight+time.
« Reply #12 on: January 19, 2019, 08:03:28 AM »
2011-2013 we ran a FED with SBC. Dynos numbers were  600 +. Car and driver were 1460#. Ran low 5s with good track and air in the 1/8th.
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Offline Curly1

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Re: Power+weight+time.
« Reply #13 on: January 19, 2019, 03:19:45 PM »
I would like for others in particular Jon Hayden to add front weights as I think it is critical to making these animals work. Mine was 1730 with 389 on front and simply was not hooking up. So it is back at chassis shop making a bunch of changes. We are moving weight back and changing engine angle from 2.7 down to .5 approx.
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dreracecar

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Re: Power+weight+time.
« Reply #14 on: January 19, 2019, 05:00:58 PM »
These days  Engine angle has zero affect unless you were way out of the park to begin with. Engine angle is the result of the relationship to how far the motor is out from the rear end to the front oil pan clearence. We are raising the front of the motor these days so that you dont tear up the diaper.  Building a new chassis right now, motors out 55" and the crank snout is 10" of the deck, I dont care what the motor angle is
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