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#10054 |
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ZLT!!! COTW (8/5/13)
Drives: 2011 IOM 1LT RS M6 Join Date: Mar 2012
Location: Slatington, PA
Posts: 4,773
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Today's question?
HP? Why it said v6 has 312hp and the dyno show less? Why when people explain the gains on the performance mods they say HP on the wheels? How you add the HP gains after each performance mods? Example: I have 312hp, I install an intake that gives 30hp, I suppose to have now 342hp... common experts!
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#10055 | |
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Location: PA
Posts: 57,201
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Quote:
When intake manufacturers make claims of HP gain, they normally take wheel horsepower, or they lie. lol The way energy and mechanics work on a car, you can't just add HP on top of each other. For instance, you can't just say an intake gave you 30hp, headers gave you 40hp, so you can add 70hp. doesn't work that way.
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#10056 |
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Location: PA
Posts: 57,201
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here is a picture of an engine dyno, that car manufacturers use to test and measure their engine's horsepower.
![]() car dyno ![]() by the time the energy and hp get to the rear wheels, it loses some power(usually 15-20% hp loss). the power to the wheels is what's important when it comes to racing/bragging.
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#10057 |
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Emerald Coast Camaros
Drives: 2010 Camaro 2LT/RS M6 Join Date: Nov 2009
Location: Tallahassee FL
Posts: 9,686
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Jason pretty much explained it all but I have one question for monchy. Who in the world claims a 30 HP gain with just an intake? The best of intakes for our cars claim half that to the wheels
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#10058 | |
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ZLT!!! COTW (8/5/13)
Drives: 2011 IOM 1LT RS M6 Join Date: Mar 2012
Location: Slatington, PA
Posts: 4,773
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Quote:
that was just an example... so how is the right way to know the real HP gain when you add different types of performance mods?
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#10059 | |
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Location: PA
Posts: 57,201
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Quote:
reason I say that, is because all dyno's are different. even the same dyno on a different day will give you different results. best thing to do is get a baseline dyno, put on your mod, and dyno again the same day, or close to the same weather conditions as the baseline dyno.
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#10060 | |
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Emerald Coast Camaros
Drives: 2010 Camaro 2LT/RS M6 Join Date: Nov 2009
Location: Tallahassee FL
Posts: 9,686
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But to me dynos have always been an estimate some are stingy with their numbers others are very giving so the true test of power is out in the real world on the track ![]() Oh and to add to add with how different dyno number can be there is a member in my group who is pushing about 700 HP to the fly wheel but with his stall converter his dyno numbers are reading in the 570 range. Same goes with rear end ratios the lower ratios (higher numerical) tend to read less HP on a dyno when in reality you are faster than what's given. |
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#10061 |
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ZLT!!! COTW (8/5/13)
Drives: 2011 IOM 1LT RS M6 Join Date: Mar 2012
Location: Slatington, PA
Posts: 4,773
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So 2 car can be same model and same mods, and have different HP? By the way, Who came up with the idea of HP? Why can be Zebra power or Cheetah Power? Lol!
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#10062 |
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Emerald Coast Camaros
Drives: 2010 Camaro 2LT/RS M6 Join Date: Nov 2009
Location: Tallahassee FL
Posts: 9,686
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Yup. Every car can be completely different which can get annoying. And my guess for horse power is Becusse before the engine carriages were pulled by horses so a motor makes the equivalent of what 312 horses can do. But that is just a guess I never really asked and just thought that.
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#10063 | |
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ZLT!!! COTW (8/5/13)
Drives: 2011 IOM 1LT RS M6 Join Date: Mar 2012
Location: Slatington, PA
Posts: 4,773
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Quote:
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#10064 |
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Banned
Drives: 2010 2SS/RS A6 & 2011 1LT/RS Join Date: Apr 2012
Location: San Diego, CA
Posts: 3,491
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Also, horsepower is a reference to the breed of horse Clydesdale. 1 horsepower is roughly equivalent to 1 Clydesdale.
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#10065 |
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Banned
Drives: 2010 2SS/RS A6 & 2011 1LT/RS Join Date: Apr 2012
Location: San Diego, CA
Posts: 3,491
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A dyno measures torque and converts it to horsepower through a mathmatical formula.
Torque x RPM ÷ 5252 = horsepower |
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#10066 |
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Banned
Drives: 2010 2SS/RS A6 & 2011 1LT/RS Join Date: Apr 2012
Location: San Diego, CA
Posts: 3,491
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"Horsepower" was termed by James Watt. He used horses for coal mining and needed to put a number on the animals output. He figured out a pony could be used to move the equivalent of 22k pounds of coal an hour and a horse could move 50% more and 33k lbs an hour.
The term horsepower is subjective. It really means nothing just like every other scale of measurement that was ever invented. |
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