1st time at the dragstrip - help me estimate my hp?
#1023929
07/01/11 01:13 PM
07/01/11 01:13 PM
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Joined: Jul 2009
Posts: 25 leawood, ks
johnv
OP
member
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OP
member
Joined: Jul 2009
Posts: 25
leawood, ks
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So, I took my car to the strip for the 1st time. It has a fresh 505 big block that was dyno’ed at 536 hp, 5400 rpm (flywheel hp, open headers). I am trying to estimate how “happy” the dyno was:
The car: 1969 road runner fiberglass hood no front bumper aluminum heads, intake, master cylinder about 30 lbs of hushmat about 30 lbs of torque boxes, frame connectors I would guess 3800 lbs with driver 3.23 no sure grip 4 speed power steering normal 7 blade fan, no clutch headers but otherwise full exhaust
Weather was hot, maybe 85F, 60% RH
My runs: 13.46 @103.3 - 2.31 60’ - missed 3rd and shut down a little early 14.38 @108.4 – 2.91 60’ – spun badly off the line 13.52 @109.9 – 2.47 60’ – no major incidents
I was out launched badly every time, probably because of driver and traction issues.
Thanks!
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Re: 1st time at the dragstrip - help me estimate my hp?
[Re: johnv]
#1023930
07/01/11 01:41 PM
07/01/11 01:41 PM
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Joined: Feb 2003
Posts: 1,665 Milwaukee, WI
Prince_Valiant
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,665
Milwaukee, WI
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I estimated 3850 w/ driver, since I actually think people underestimate their weights/fuel/etc.... BUT, given you're trap speeds, I'd say right around 400hp to the rear wheels.
1979 Dodge Lil' Red Express - 360 rwhp, 13.2 @ 103mph 1968 Coronet: 318, 2.76, 15.2 @ 92mph! (SOLD) 1976 Valiant: 360, 3.90, 12.90 @ 106 (SOLD) 1989 Shelby CSX #500/500
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Re: 1st time at the dragstrip - help me estimate my hp?
[Re: buildanother]
#1023936
07/02/11 04:51 PM
07/02/11 04:51 PM
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Joined: Apr 2010
Posts: 4,154 bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
Broken parts are probably in your future, especially if you put slicks on. 505 + 4 speed + open diff
and i couldn't agree more!
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Re: 1st time at the dragstrip - help me estimate my hp?
[Re: BSB67]
#1023937
07/02/11 07:51 PM
07/02/11 07:51 PM
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Joined: Jul 2009
Posts: 25 leawood, ks
johnv
OP
member
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OP
member
Joined: Jul 2009
Posts: 25
leawood, ks
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Quote:
The Moroso Speed Calculator puts you at about 395 net actual flywheel hp.
I would focus on getting a sure grip, maybe a better tire, track launching/driving/shifting practice and tuning before I would get to excited about what the HP is based on your one outing.
I bet you'll be in the low 12s @ 115 mph with a 1.9 sixty ft in no time.
Thanks, it sounds like a that calculator is a little more conservative than the one on the tech archives.
A sure grip is definitely in my future, but I intend the car more for a cruiser than drag racing, so the tires will most likely stay as the weak link.
My nature is to be skeptical about engine builders dyno results, so doing a sanity check was my main purpose (other than fun) for the trip to the dragstrip.
Thanks again,
John
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Re: 1st time at the dragstrip - help me estimate my hp?
[Re: johnv]
#1023938
07/02/11 10:29 PM
07/02/11 10:29 PM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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The way your MPH is jumping all over the place its hard to say, I'm sure theres another 5 MPH or more in it, so lets say 114, thats in the 11s, your gears are hurting you, I see this alot but don't understand, why do guys build a somewhat monster style engine only to kill it with highway gears , if you want a cruiser, put a mild 318 in it!!
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