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2011-2014 Mustang Talk Forum

2011-2014 Talk | 2011-2014 GT | 2011-2014 V6 | 2005-2010 Talk | 2005-2010 GT | 2005-2010 V6 | Shelby GT500 | Mustang Tech 
 

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Unread 10-15-2013   #16 (permalink)
irishmustang11 is offline Apprentice


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Quote:
Originally Posted by notaV8 View Post
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
What kind of dyno did you use? If it was a DynoJet, that immediately explains higher numbers with very mild mods, along with it being a manual. With those mods, I highly doubt you were on a Mustang Dyno.

My baseline of 321 rwhp was a mixture of the dyno type, the car being an automatic, the tech not taking traction control off, and him leaving it in drive versus using select shift. If I'm not mistaken, most baselines for manuals on a Mustang Dyno are closer to 340 rwhp.

With the latest run on a Mustang Dyno, the car was in 3rd gear using select shift (4th topped out at about 120 mph; AM is sending me a dyno tune), and traction control was turned off. I was using the 91 race tune, which combined with the headers, got me an additional 40 rwhp in 3rd gear at 106 mph. According to the tech, I would have gained an additional 5-7 rwhp if we could have run it in 4th. That puts my realistic gain at 45-47 rwhp (366-368 rwhp total), which I think is pretty damn good for just adding headers and a tune.

I could go out on a DynoJet right now and probably make at least 420 rwhp, but to me, it's just inflating my numbers to make it look better. As mentioned before though, the primary goal is to use the same dyno to get a baseline and then accurate gains for mods.

Have you run yours at the track? We only have an 1/8 mile track here and I'm really looking forward to getting back out there. I did one run with just exhaust and a tune; I ran an 8.53 with a crappy reaction time (probably would have been closer to 8.3 with a little work). I'm anxious to see what I run with the headers installed.
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Unread 10-16-2013   #17 (permalink)
notaV8
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Quote:
Originally Posted by irishmustang11 View Post
What kind of dyno did you use? If it was a DynoJet, that immediately explains higher numbers with very mild mods, along with it being a manual. With those mods, I highly doubt you were on a Mustang Dyno.

My baseline of 321 rwhp was a mixture of the dyno type, the car being an automatic, the tech not taking traction control off, and him leaving it in drive versus using select shift. If I'm not mistaken, most baselines for manuals on a Mustang Dyno are closer to 340 rwhp.

With the latest run on a Mustang Dyno, the car was in 3rd gear using select shift (4th topped out at about 120 mph; AM is sending me a dyno tune), and traction control was turned off. I was using the 91 race tune, which combined with the headers, got me an additional 40 rwhp in 3rd gear at 106 mph. According to the tech, I would have gained an additional 5-7 rwhp if we could have run it in 4th. That puts my realistic gain at 45-47 rwhp (366-368 rwhp total), which I think is pretty damn good for just adding headers and a tune.

I could go out on a DynoJet right now and probably make at least 420 rwhp, but to me, it's just inflating my numbers to make it look better. As mentioned before though, the primary goal is to use the same dyno to get a baseline and then accurate gains for mods.

Have you run yours at the track? We only have an 1/8 mile track here and I'm really looking forward to getting back out there. I did one run with just exhaust and a tune; I ran an 8.53 with a crappy reaction time (probably would have been closer to 8.3 with a little work). I'm anxious to see what I run with the headers installed.
Not a mustang dyno, they are running a $40 for three pulls special all the time so I may head their way this or next week and see since ive had my tune tinkered with a bit.

Nope never been to the track but I have used the track apps. I went once and I didnt have a helmet ( didn't know my car was too fast to go down without one ) so I just watched.
 
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Unread 10-16-2013   #18 (permalink)
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Quote:
Originally Posted by devildog1679 View Post
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.”
Ok
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