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Hp from 1/4 mile trap speed accuracy

Old 11-21-2018, 05:34 PM
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Default Hp from 1/4 mile trap speed accuracy

Hey everyone. I was just curious about the accuracy of those “calculate hp from trap speed” online calculators. The reason Im wondering is because my car consistently traps between 132-134 with a 1.8-1.9 60ft. When I had it tuned it made 529rwhp and around 510rwtq, this was on a Mustang dyno. I know the general idea is that a Mustang reads lower than a dyno jet, but with my trap I would think the car would be making substantially more power than 529 at the wheels. Race weight is 3750 before I put in my Strange s60.

Here’s a link to one of those calculators. I mean according to this one my car is making around 680 at the wheels.
http://www.cprparts.com/HPcalculator.html

Dyno numbers really don’t mean much to me, and I’m thrilled Im trapping 130+, but I was just thinking about whether that correlates with 539rwhp and a 3800lb race weight🤔


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Old 11-21-2018, 07:58 PM
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How's it going man. Well, there will be some on here that will not at all be impressed with your trap speeds. I think trapping over 130, at that weight, is very respectable. Really can't give any info on those online calcs. Am interested in some details of combination/car. I think you making some pretty good power. Good job.
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Old 11-21-2018, 08:24 PM
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Originally Posted by SoFla01SSLookinstok View Post
How's it going man. Well, there will be some on here that will not at all be impressed with your trap speeds. I think trapping over 130, at that weight, is very respectable. Really can't give any info on those online calcs. Am interested in some details of combination/car. I think you making some pretty good power. Good job.
Thanks, well its a 3rd gen Camaro with a 5.3 Lm7 and an Lsa blower. Currently running untouched 799 heads with a stage 2 turbo cam on meth pushing 15 psi with a 2.4 pulley through an m6. The reason I was interested in the trap speed was because a friend pointed out that Im trapping very close to a C7 zr1, which I believe is around 135 with close to the same weight. It just surprised me that the little 5.3 had to be making more power than I thought to hit that mph. Honestly I figured it would do mid 120’s at best when I put it together. I was just trying to get a more accurate power # is all.
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Old 11-21-2018, 08:33 PM
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C7's weight 3750 now? That's 695 crank hp,

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Old 11-21-2018, 08:33 PM
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Originally Posted by Mgg4591 View Post
Thanks, well its a 3rd gen Camaro with a 5.3 Lm7 and an Lsa blower. Currently running untouched 799 heads with a stage 2 turbo cam on meth pushing 15 psi with a 2.4 pulley through an m6. The reason I was interested in the trap speed was because a friend pointed out that Im trapping very close to a C7 zr1, which I believe is around 135 with close to the same weight. It just surprised me that the little 5.3 had to be making more power than I thought to hit that mph. Honestly I figured it would do mid 120’s at best when I put it together. I was just trying to get a more accurate power # is all.
That little guy is makin some good power. Maybe some more people with some experience in that area, 5.3 with blower, will chime in. Maybe find out what some stock cars put down on that dyno? Maybe help give an idea of where it's at. Still that's awesome job man.
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Old 11-21-2018, 08:36 PM
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Originally Posted by handyandy496 View Post
C7's weight 3750 now?
quick google search said 3560. My car is 3750 with me in it, about 1/4 tank of gas. C7 should be around the same give or take a few pounds depending on the driver.
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Old 11-21-2018, 08:42 PM
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Wow, I just realized my car actually weighed exactly the same.




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Old 11-21-2018, 08:44 PM
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Old 11-21-2018, 08:52 PM
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Originally Posted by handyandy496 View Post
That's 695 crank hp,
Thanks, thats what I was wondering. Im always getting asked how much power it makes but between the mustang number and the trap speed I dont know what to think.
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Old 11-21-2018, 09:25 PM
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I think trap speed is very accurate to crank hp. There's just to much fudge between all the others and it makes my head hurt. With that result you can see with proper gearing or stall speed/tires what you can truly attain in the 60' zone. I love the feel of a good 60 ft time.
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Old 11-21-2018, 09:32 PM
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Originally Posted by handyandy496 View Post
I think trap speed is very accurate to crank hp. There's just to much fudge between all the others and it makes my head hurt. With that result you can see with proper gearing or stall speed/tires what you can truly attain in the 60' zone. I love the feel of a good 60 ft time.
Oh yea, when I first hit the track with the blower on street tires it did an 11.4 at 126. This was with 4.10’s on street tires, through the 10 bolt and shifting to 5th. Once I got the S60 rear in with 3.73s, and topping out 4th across the line, it did a [email protected] with a 1.8 60ft. I need a torque arm and better clutch, but I can’t wait for next season.
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Old 11-21-2018, 10:35 PM
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Originally Posted by Mgg4591 View Post


Thanks, well its a 3rd gen Camaro with a 5.3 Lm7 and an Lsa blower. Currently running untouched 799 heads with a stage 2 turbo cam on meth pushing 15 psi with a 2.4 pulley through an m6. The reason I was interested in the trap speed was because a friend pointed out that Im trapping very close to a C7 zr1, which I believe is around 135 with close to the same weight. It just surprised me that the little 5.3 had to be making more power than I thought to hit that mph. Honestly I figured it would do mid 120’s at best when I put it together. I was just trying to get a more accurate power # is all.
it makes 406hp when anyone ask...
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Old 11-22-2018, 12:08 PM
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Lmao I'll just keep my n/a dyno sheet in the car when it made 350rwhp.
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Old 11-23-2018, 04:01 PM
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Originally Posted by Mgg4591 View Post
Hey everyone. I was just curious about the accuracy of those “calculate hp from trap speed” online calculators. The reason Im wondering is because my car consistently traps between 132-134 with a 1.8-1.9 60ft. When I had it tuned it made 529rwhp and around 510rwtq, this was on a Mustang dyno. I know the general idea is that a Mustang reads lower than a dyno jet, but with my trap I would think the car would be making substantially more power than 529 at the wheels. Race weight is 3750 before I put in my Strange s60.

Here’s a link to one of those calculators. I mean according to this one my car is making around 680 at the wheels.
http://www.cprparts.com/HPcalculator.html

Dyno numbers really don’t mean much to me, and I’m thrilled Im trapping 130+, but I was just thinking about whether that correlates with 539rwhp and a 3800lb race weight🤔


The Dynojet fudge factor between the one Mustang dyno in my arear, compared to the 3 Dynojets higher readings is 12.5% SAE more on one, 13.5% SAE more on another and 14.0% SAE more on high reading one LOL.

I think there are at least 3 ways you can back into HP from MPH. One of those 3 ways I got to match up almost same as my Mustang Dyno reading of 359 RWHP. Dynojet HP is 409 RWHP,.Curb weight of 3565 Lbs with driver an around 4 gallons of fuel (curb weight car with full tank of gas no driver is 3410 lbs and 3635 lbs with driver.

Trapped at 120.+ mph. ET 11.999 at LS Fest 1.97 60' 300 TW street tires. No burn out, no wheel spin off line, dead hook, with 52% of cars weight resting on rear tires with driver in it, almost full tank of gas because I filled up tank by mistake the night before when I arrived, . .




120 MPH trap speed only requires engine in car, in gear it traps in to be only turning 5800 RPM in order to trap at 120 MPH. That's the same RPM as Max HP for engine is achieved. Engine is a TQ one rather than HP one.

From my point of view, the ones who talk about High MPH meaning "you have more HP than Dyno shows is to help with their bruised Ego's only. That 1/4 mile long black Dyno's ET wins. not MPH or Dyno sheets....LOL










PS: I have an excuse for my car, it a Show/Custom car, not built for Go....LOL



If it's ever finished, the below car is one I want to try and get in 10's with 410-20 RWHP on 300 TW Street Tires, no DR's or Slicks. Same 3.50 Rear Gear and trans as other car.
Trying for a weight reduction of 700-800 LBs less weight on it, which will make rear wheel traction a problem for it.




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Old 11-23-2018, 09:23 PM
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Trap speed is average horsepower applied from launch to end. A 4500+ converter, tight gear spacing, instant shifts all keep the engine in the meat of its powerband. Why do you see cars that hook exhibiting slightly lower trap speeds than ones that spin? Hook drops the average rpm/hp slightly in first gear.

Last edited by Summitracing; 11-23-2018 at 09:32 PM.
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