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Old 10-13-2015, 09:22 PM   #36
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Yeah I figured I might be lol. Dyno pulls in 4th or 5th?

You can do it in 4th if you want on the mt-82 car with 3.31's but it won't be accurate.

For instance what we did to get my baseline # was just remove the speed limiter. Didn't touch anything else With the tune. So we could get a legit 5th gear pull 100% stock


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Old 10-13-2015, 11:29 PM   #37
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Originally Posted by Rapinator126 View Post
You can do it in 4th if you want on the mt-82 car with 3.31's but it won't be accurate.

For instance what we did to get my baseline # was just remove the speed limiter. Didn't touch anything else With the tune. So we could get a legit 5th gear pull 100% stock


🍼and 🌽 fed coyote.

What did you put down stock Rap? Just curious.


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Old 10-13-2015, 11:45 PM   #38
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I have seen him post it before 376ish maybe?
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Old 10-14-2015, 12:25 AM   #39
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Originally Posted by Ish416 View Post
Ford themselves claimed a 10 hp difference on the 5.0 between 87 and 91 octane.

That is also the 2011. The newer ones are similar.

Horsepower

412 hp @ 6,500 rpm, 91 octane
402 hp @ 6,500 rpm, 87 octane
Torque
390 lb-ft @ 4,250 rpm, 91 octane
377 lb-ft @ 4,250 rpm, 87 octane

2011 Ford Mustang GT 5.0 Coyote Engine - 5.0 Mustang & Fast Fords
We all know manufacturer "claims" aren't always the most accurate.
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Old 10-14-2015, 02:24 PM   #40
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We all know manufacturer "claims" aren't always the most accurate.
Actually manufacturer crank hp claims are very accurate (though often understated) and the BEST thing out there. They test the engines at the crank with fewer variables in the mix.

Or I guess you'd prefer a dyno at your local shop over what a manufacturer says.

Manufacturers have billions of $ of R&D. They know how to test hp at the crank very accurately. On top of that, they have complex computer simulations of everything that lets them know in advance before even building an engine what its going to make.

So when Ford says their engines make 420 hp. You'd better believer that their engines can & will make that even in some of the worst situations (high altitude, high heat, etc.)

Obviously, there's going to be some variations in engines/break ins/ etc., so some might have a little less friction thus generate more power here or there. but for the most part the engines are probably making 425hp +- 6hp.

Once, you add in the variables or transmission, driveshaft, rear diff/gears, wheels, etc... you're going to see a lot more variation on the final output at a dyno.

Maybe what you mean is manufacturer's don't tweak / tune out the most performance out of cars?
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Old 10-15-2015, 01:45 PM   #41
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The SAE allows a one-percent tolerance between the number that the SAE witness observes and the horsepower rating that a manufacturer chooses to publish.
Although they can say whatever they want but then can't say it's SAE certified rated.
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Old 10-16-2015, 01:03 AM   #42
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So am I calling bull**** on these people or what?
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Old 10-16-2015, 01:18 AM   #43
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So am I calling bull**** on these people or what?
Should be lol

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Old 10-16-2015, 07:22 AM   #44
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So am I calling bull**** on these people or what?
Either that or you have severe engine problems............
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Old 10-16-2015, 07:50 AM   #45
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So am I calling bull**** on these people or what?
When I had my 2012 5.0 I put down something around 370 hp / 350 ft-lbs peak. The numbers you have are way low. Did they do it in the right gear (1:1)?

As others have said. Dynos are just tools for numbers. A lot of factors go into it, including calibration (which may be off here), and ambient conditions. I just wouldn't expect the difference you are seeing. I would talk to brenspeed about this. Something is off.

You can always go to the strip too. Trap speed is another indication of hp.

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