How do you get Horsepower & Torque #'s to match? - Forums at Modded Mustangs
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post #1 of 24 Old February 9th, 2013, 10:43 AM Thread Starter
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How do you get Horsepower & Torque #'s to match?

So my goals for my car are around 450rwhp...

BUT!

I'd like to have 450rwhp AND 450rwtq, if not very close to matching numbers.

Is there any way I can do this?



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post #2 of 24 Old February 9th, 2013, 10:49 AM
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How do you get Horsepower & Torque #'s to match?

HP is a derivation of torque. So depends on a lot of things.

HP = (TQ x RPM) / 5252


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post #3 of 24 Old February 9th, 2013, 10:56 AM Thread Starter
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Originally Posted by casadyr View Post
HP is a derivation of torque. So depends on a lot of things.

HP = (TQ x RPM) / 5252


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Hmm... I read that somewhere. But I think more of the answer I was looking for is if anyone has a car they built with 430rwhp or more and relatively has a if not same very close hp & tq to the tire...

...and what did they do to there car to get it that way?



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post #4 of 24 Old February 9th, 2013, 11:14 AM
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You want more torque than HP anyways.

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post #5 of 24 Old February 9th, 2013, 11:28 AM
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I am close. a pd blower will give you close results. also tq and hp are the same at 5252 rpm on all cars

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post #6 of 24 Old February 9th, 2013, 11:48 AM
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A positive displacement blower will give you HP and tq numbers that are close, but you also have to choose the right cam that will give you a nice tq power band. For example there is a blue bullitt on this forum that makes 517/456 with bolt ons, Vortech S trim at 11psi and MHS Stage 1 cams. The cams provide a very nice wide tq band. From 3500-6300rpm the torque is above 400rwtq and doesn't drop off. Getting the numbers closer together would be difficult. The amount of tq the car makes also depends on how much timing is in the tune throughout the rpms.

My numbers are close, but as I add more power the hp will increase more than the tq. Longtubes helped out my torque numbers.

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post #7 of 24 Old February 9th, 2013, 11:49 AM
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Quote:
Originally Posted by DeathBringer View Post
You want more torque than HP anyways.
Then you must love diesels.


There really is no simple answer. It involves a variety of factors, one of which is the bore/stroke ratio. The 4.6 is relatively square (they are roughly the same) which favors a balanced hp/tq rating. A longer stroke compared to bore will favor more torque, like in diesel engines and the old stump pulling big blocks, like the olds 455. There is also optimization that can be done with the intake manifold/runners, head CC design, and especially cam profiles to favor hp or torque, which is basically to say low end torque or high end torque.
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post #8 of 24 Old February 9th, 2013, 11:49 AM
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PD blower or nitrous. a centri wont do it. or a bigger cube motor.



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post #9 of 24 Old February 9th, 2013, 12:43 PM
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Quote:
Originally Posted by limited View Post
also tq and hp are the same at 5252 rpm on all cars
While this is true it doesnt mean that is where it sees peak tq.

Quote:
Originally Posted by boduke0220 View Post
a centri wont do it.
Small pulley and a wastegate and it can.

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post #10 of 24 Old February 9th, 2013, 02:07 PM
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Quote:
Originally Posted by boduke0220 View Post
PD blower or nitrous. a centri wont do it. or a bigger cube motor.
When I put mine on the dyno with a centri, it was showing more TQ than HP. It was only a difference of 5-7 but it was still more. Also it wasn't at 450 either, but hoping to find out soon if it will stay around the same margin.

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post #11 of 24 Old February 9th, 2013, 04:20 PM
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Quote:
Originally Posted by GM2Ford View Post
So my goals for my car are around 450rwhp...

BUT!

I'd like to have 450rwhp AND 450rwtq, if not very close to matching numbers.

Is there any way I can do this?
Why?

As others have implied, there is only one rpm where it is possible that peak torque and peak HP can be equal, 5252 rpm. Why is this so important?

------------------------------------------------------
James Watt guesstimated many years ago that a "good dray [draft] horse" could do 33,000 lb-ft of work per minute. I.e. move 33,000 lbs one foot in one minute--or 330 lbs 100 feet in one minute. When referring to rotational power transmission the distance traveled is always the circumference of the circled traveled; which is the diameter of the circle * pi (a constant = 3.14)--or the radius of the circle * 2 * pi.

Well as it turns out 33,000 / (2 * pi) = 33,000 / 6.28 = 5252. That is why lb-ft * rpm / 5252 = HP.

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Last edited by cliffyk; February 9th, 2013 at 06:45 PM.
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post #12 of 24 Old February 9th, 2013, 06:51 PM
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Quote:
Originally Posted by GM2Ford View Post
I know 450rw won't get me there... but eventually so I can do this

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Please, leave the comments about it being a Camaro or Chevy out of this Thread. Thanks, I'm a fan of all cars.
I mean absolutely no offense, however you need to learn much more about the relationship of torque, rpm, horsepower and gear ratios before asking questions like "I'd like to have 450rwhp AND 450rwtq...". Once you learn more you will realise that that is a nonsensical question.

And who said anything about "it being a Camaro or Chevy"?

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post #13 of 24 Old February 9th, 2013, 07:00 PM Thread Starter
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Quote:
Originally Posted by cliffyk View Post
I mean absolutely no offense, however you need to learn much more about the relationship of torque, rpm, horsepower and gear ratios before asking questions like "I'd like to have 450rwhp AND 450rwtq...". Once you learn more you will realise that that is a nonsensical question.

And who said anything about "it being a Camaro or Chevy"?
Okay. That's cool. Thanks for not being an asshole about it like many people on forums. I was just wondering if anyone had a 4.6 2v or 4v that was in that range of power at PEAK rpm, and what they did to get it there.

Also, there are plenty of chevy/camaro haters out there. So in no means was I directing that toward you, but you know... you get those people that are like... ew, its a chevy, F that, blah blah blah blah blah ya know? So I just said that to weed out the people saying that.



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post #14 of 24 Old February 9th, 2013, 11:02 PM
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I don't know how anyone could plan equal peak torque and horsepower. My motor reaches peak torque around 4800 rpm and peak horsepower around 5900 rpm. Below 5252 torque is higher than horsepower. Above 5252 horsepower is higher. Horsepower will continue increasing until torque drops off faster than rpm is increasing.

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post #15 of 24 Old February 9th, 2013, 11:08 PM
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Re: How do you get Horsepower & Torque #'s to match?

I actually asked same question few months ago
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post #16 of 24 Old February 10th, 2013, 09:20 AM
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Quote:
Originally Posted by cobra241 View Post
I actually asked same question few months ago
I still remain curious as to why? What is it about having torque and HP peak at the same rpm (5252¹) that is felt to be desirable?

----------------------------------------------
¹ - The rpm, if HP and torque are equal, will always be 5252 rpm because of the formula's simple maths and fixed constant.

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post #17 of 24 Old February 10th, 2013, 09:55 AM
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Well i was only able to take mine to 5500 rpm. But id say mine is pretty damn equal. Torque doesnt fall below 500 over the entire curve. Once i find my problem hp will most likely continue to rise quite a bit higher than torque. Mods in garage or build thread


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post #18 of 24 Old February 10th, 2013, 09:59 AM
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Re: How do you get Horsepower & Torque #'s to match?

I think I'd actually like a little more torque then then horsepower. Let me find my question
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post #19 of 24 Old February 10th, 2013, 10:03 AM
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Re: How do you get Horsepower & Torque #'s to match?

https://www.moddedmustangs.com/forums...e-than-hp.html
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post #20 of 24 Old February 10th, 2013, 10:36 AM
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Well then spray it. Spray will yield way more torque than hp. You could also spray on top of boost. I just like the idea of power on tap rather than having to fill up a bottle for power. I may get bored eventually and spray on top of the kb but for now, 580/570 is plenty enough power. Its a blast to drive. Im sure just a centri at 9-12 psi will hold off your power needs for a while. You will feel the torque. No need for a dyno graph that shows torque higher than hp. Whats the point?

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