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Unread 10-12-2013   #1 (permalink)
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Default Dyno with Kooks Headers

For whatever reason, still have a speed limiter. Could only do the select shift mode in 3rd gear because of it. On this Mustang Dyno, I hit 361 rwhp and 321 ft-lb of torque at 6600 RPMs. The tech said if he could have gone into 4th, it would have been closer to 370 rwhp.
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Unread 10-12-2013   #2 (permalink)
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seems low...do you have a custom tune?
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Unread 10-12-2013   #3 (permalink)
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Mustang dyno's read a little lower than dynojet.

The question is what was the baseline number before the headers?

It's the comparison between baseline and modded that is important.

Saw a dyno pull on a dynojet of a bone stock '14 and it was 376/349.
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Unread 10-12-2013   #4 (permalink)
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Quote:
Originally Posted by 2Manystangs View Post
seems low...do you have a custom tune?
Bama.

Quote:
Originally Posted by Ltngdrvr View Post
Mustang dyno's read a little lower than dynojet.

The question is what was the baseline number before the headers?

It's the comparison between baseline and modded that is important.

Saw a dyno pull on a dynojet of a bone stock '14 and it was 376/349.
Baseline was 321. If it hadn't been for the speed limiter being reached, we could have gone higher than 3rd gear, which would have made a little bit of a difference today. I'll get that fixed and then once I get the Ford Racing intake manifold installed, probably take it back for another dyno.
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Unread 10-13-2013   #5 (permalink)
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low gears make low numbers... If it was in fifth, 1 to 1, your numbers would have been higher... like those that dyno with 3.31 and taller... remember... a dyno is a tool and should be used to give you the direction, amount of change and torque curve ... nothing more.
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Unread 10-13-2013   #6 (permalink)
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Quote:
Originally Posted by JohnRichard View Post
low gears make low numbers... If it was in fifth, 1 to 1, your numbers would have been higher... like those that dyno with 3.31 and taller... remember... a dyno is a tool and should be used to give you the direction, amount of change and torque curve ... nothing more.
Very true. Regardless of the final numbers, I'm happy with the gain. I read that for the automatics, 4th gear is the closest to 1:1, whereas the manual is 5th. I'm still stuck with my stock 3.15s. I'm hoping to upgrade to 3.73s someday.
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Unread 10-13-2013   #7 (permalink)
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Quote:
Originally Posted by irishmustang11 View Post
Bama.



Baseline was 321. If it hadn't been for the speed limiter being reached, we could have gone higher than 3rd gear, which would have made a little bit of a difference today. I'll get that fixed and then once I get the Ford Racing intake manifold installed, probably take it back for another dyno.
So the headers alone gave you a 40 HP bump? That's pretty damn good.
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Unread 10-13-2013   #8 (permalink)
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how is that possible when I made 387rwhp stock and now I'm at 420rwhp+ tuned on 93 octane? Mine was done at 5th gear with 3:31s manual
 
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Unread 10-14-2013   #9 (permalink)
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Quote:
how is that possible when I made 387rwhp stock and now I'm at 420rwhp+ tuned on 93 octane? Mine was done at 5th gear with 3:31s manual
Because of all the reasons above about dyno numbers...
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Unread 10-14-2013   #10 (permalink)
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Because of all the reasons above about dyno numbers...
Yeah but he has headers and I don't. Performance wise, all I have is: off road h pipe, borla s type axlebacks, and a 101mm steeda cai, oh and a a tune but yeah its still extremely low numbers for him.
 
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Unread 10-14-2013   #11 (permalink)
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Hang on, what's the dyno thing? If you have a LOWER gear ratio, Say 3.15 vs 3.73 the 3.15's will dyno HIGHER numbers? Or did i read the wrong?
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Unread 10-14-2013   #12 (permalink)
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Yeah but he has headers and I don't. Performance wise, all I have is: off road h pipe, borla s type axlebacks, and a 101mm steeda cai, oh and a a tune but yeah its still extremely low numbers for him.

You have a manual trans, he has an auto. He would probably put up a better 1/4 mile time than you with those mods.

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Hang on, what's the dyno thing? If you have a LOWER gear ratio, Say 3.15 vs 3.73 the 3.15's will dyno HIGHER numbers? Or did i read the wrong?

Yes that is correct. Less friction and therefore drivetrain loss with lower numerical(taller) gears. We are talking 5-10hp measured at the wheels and not a perceptible performance difference. The shorter(3.73, 4.10) gears will still feel faster.
 
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Unread 10-14-2013   #13 (permalink)
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You have a manual trans, he has an auto. He would probably put up a better 1/4 mile time than you with those mods.




Yes that is correct. Less friction and therefore drivetrain loss with lower numerical(taller) gears. We are talking 5-10hp measured at the wheels and not a perceptible performance difference. The shorter(3.73, 4.10) gears will still feel faster.
Well thank god I don't go to the track and it's just a mega fun daily. If i was about timeslips I woulda gotten an old 5.0 and built the crap out of it with an automatic trans.
 
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Unread 10-14-2013   #14 (permalink)
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Quote:
Originally Posted by JohnRichard View Post
low gears make low numbers... If it was in fifth, 1 to 1, your numbers would have been higher... like those that dyno with 3.31 and taller... remember... a dyno is a tool and should be used to give you the direction, amount of change and torque curve ... nothing more.
Wrong-
I just got the following explanation from another forum and called the shop and they verified the info given to me when I dyno'd my car
“the reason for the dyno in the 1:1 gear ratio is due to the Dynojet. Dynojet mathematically creates a horsepower number based on mass (which is the known weight of the rollers) and accleration (how fast the car is accelerating the known weight).

F=ma

From force (F), we can calculate horsepower.

Dyno the car in 2nd gear, and acceleration (a) goes way up, causing force (F) to go way up.

So by dynoing the car in the gear closest to the 1:1 gear ratio, we eliminate any acceleration advantage or disadvantage caused by the transmission, which gives us unskewed whp numbers (even though Dynojet has a fudge factor in there which makes them skewed anyways and read high).

As for other dynos out there (i.e. Mustang and Dyno Dynamics) - they use a load cell to measure roll force (the amount of force the tire is placing on the roller). Based on roll force and the radius arm going to the load cell, we get roll torque. Based on roll torque and roll speed, we can get vehicle horsepower. Vehicle horsepower and vehicle RPM gives vehicle torque. It doesn't matter what gear you run in on load cell style dynos as they are measuring force, not acceleration. Force does not change from gear to gear.”
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Unread 10-15-2013   #15 (permalink)
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Actually JohnRichard is correct, dynos measure work and not just force. Dynoing in 5th gear will put about 10-15hp MORE to the wheels than a 4th gear pull and has been confirmed multiple times over several different dyno types. The Dynojet is by far the most popular kind of dyno and I'm sure there is an exception to this. Now for an automatic the numbers are already skewed due to the torque converter and the amount of slip called for by the tune.
 
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