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Old 05-15-2016, 07:56 PM   #281
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Quote:
Originally Posted by jimbo486 View Post
A dyno video on Facebook showed up in my feed earlier.

2348hp/4002ft. lbs.!!
unreal.
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Old 05-15-2016, 08:23 PM   #282
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Was this fuel only?


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Old 05-15-2016, 09:07 PM   #283
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No

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Old 05-15-2016, 09:14 PM   #284
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Was it corrected?
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Old 05-15-2016, 09:45 PM   #285
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Quote:
Originally Posted by fatty View Post
Was it corrected?


It was awesome I know that.
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Old 05-15-2016, 09:50 PM   #286
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It was pretty much at sea level, so correction wasn't a factor, the RPM was calibrated off roller speed and the dyno sheet shows I lifted at 3400rpm and my data log shows I lifted at 3900rpm, so I was either spinning or the rpm was off, affecting the TQ number. Regardless, it doesn't change the HP but would be closer to 3500ft lbs accurading to the data log. I ran a tune that did around 2000hp on the engine dyno and hit it with two big nitrous solenoids on the dyno, so I think the hp is accurate. We were still running a tune that did 1472hp on the engine dyno for the drag strip and ran consistent 5.40s all day.
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Old 05-15-2016, 09:55 PM   #287
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Awesome!

Just so you know, I'm not as smart as I think I am.
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That statement just reduced the collective IQ of the entire forum.
 
Old 05-15-2016, 09:56 PM   #288
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Was it corrected?
Probably, to keep it fair with all the others who would actually want corrected.
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Old 05-15-2016, 11:12 PM   #289
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What i am curious about is your hitch set up. I would like to see more detailed pics of your lock out member and the mounting point in the back. If that isn't giving away too many trade secrets that is.
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Old 05-16-2016, 06:34 AM   #290
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Quote:
Originally Posted by jimbo486 View Post
2348hp/4002ft. lbs.!!
Quote:
Originally Posted by STROKETHISF350 View Post
Was this fuel only?
You bet.



 
Old 05-16-2016, 09:44 AM   #291
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Quote:
Originally Posted by LAmiller View Post
It was pretty much at sea level, so correction wasn't a factor, the RPM was calibrated off roller speed and the dyno sheet shows I lifted at 3400rpm and my data log shows I lifted at 3900rpm, so I was either spinning or the rpm was off, affecting the TQ number. Regardless, it doesn't change the HP but would be closer to 3500ft lbs accurading to the data log. I ran a tune that did around 2000hp on the engine dyno and hit it with two big nitrous solenoids on the dyno, so I think the hp is accurate. We were still running a tune that did 1472hp on the engine dyno for the drag strip and ran consistent 5.40s all day.
What kind of dyno was that? Ours measures rpms off of the roller as well.
 
Old 05-16-2016, 09:48 AM   #292
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Quote:
Originally Posted by fatty View Post
Was it corrected?
From a couple of other dyno sheets I saw posted it looked as if they were using a .99 correction. I'm not a dyno expert by any means but think that 1.00 is uncorrected, so I would say it was basically uncorrected.
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Old 05-16-2016, 10:09 AM   #293
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Quote:
Originally Posted by LAmiller View Post
It was pretty much at sea level, so correction wasn't a factor, the RPM was calibrated off roller speed and the dyno sheet shows I lifted at 3400rpm and my data log shows I lifted at 3900rpm, so I was either spinning or the rpm was off, affecting the TQ number. Regardless, it doesn't change the HP but would be closer to 3500ft lbs accurading to the data log. I ran a tune that did around 2000hp on the engine dyno and hit it with two big nitrous solenoids on the dyno, so I think the hp is accurate. We were still running a tune that did 1472hp on the engine dyno for the drag strip and ran consistent 5.40s all day.
If the RPM's were off, all the numbers are bad

HP = (RPM * Torque)/ 5252

Regardless of that, you've already proven what you have and are good enough to come tell everyone there was an issue. Some others would be running around bragging over the numbers even when they know they were wrong. It's refreshing to see you only want the truth be told about your truck. Others could sure learn from your actions
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Old 05-16-2016, 10:44 AM   #294
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It was a dynocom, and actually that dyno calculates tq/hp backward. It uses the roll torque to calculate the hp and then back calculates the tq according to the engine rpm calculations based off of roll speed when using snapshot. The HP will remain accurate even if the rpm was totally lost, but the torque would be off. If you do not use any kind of engine RPM recording (snap shot or optical) you will still get accurate HP but no engine torque readings.
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Old 05-16-2016, 11:39 AM   #295
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Old 05-16-2016, 12:26 PM   #296
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Quote:
Originally Posted by phale View Post
It was a dynocom, and actually that dyno calculates tq/hp backward. It uses the roll torque to calculate the hp and then back calculates the tq according to the engine rpm calculations based off of roll speed when using snapshot. The HP will remain accurate even if the rpm was totally lost, but the torque would be off. If you do not use any kind of engine RPM recording (snap shot or optical) you will still get accurate HP but no engine torque readings.

If the Dynocom has a Torque cell to measure real torque at the roller it will still read wrong HP and torque, if the tires are slipping as the numbers it assumes to get back to engine RPM would still be wrong. Since Lavon said he backed off at 3900 by the logger, yet the dyno sheet showed, 3400 something was amiss.

His truck is great and he has proven that well already.
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Old 05-16-2016, 12:29 PM   #297
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Quote:
Originally Posted by phale View Post
It was a dynocom, and actually that dyno calculates tq/hp backward. It uses the roll torque to calculate the hp and then back calculates the tq according to the engine rpm calculations based off of roll speed when using snapshot. The HP will remain accurate even if the rpm was totally lost, but the torque would be off. If you do not use any kind of engine RPM recording (snap shot or optical) you will still get accurate HP but no engine torque readings.
That's interesting. I didn't know anyone did it that way. How does it calculate it? Roller rpm, and liquid cooled electric motor putting in a calibrated load?

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Old 05-16-2016, 12:43 PM   #298
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Eddy current. 2 dissimilar metals (aluminum and steel) Rhone is fixed, current is applied to the other like an electromagnet, and it resists rotating force. Mdore current =more load. Of you know how much current it takes to control a certain rpm, you can calculate tprque and hp.
 
Old 05-16-2016, 01:47 PM   #299
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On our shop's Mustang dyno, HP is measured from the roller acceleration rate, and TQ is calcuated based on engine speed which is synced with roller speed. It's impossible to trick the HP output with tire slippage and make it throw unrealistic raw HP figures, but it will throw unrealistic TQ numbers if there is slippage. For example, if everything was synced up correctly and then we made a pull with the torque converter unlocked, HP would drop some because of fluid coupling losses in the converter, but the engine torque numbers would increase a little because the unlocked converter might let the engine rev to 3000 rpm and make peak HP when the roller speed is less where it computes 2000 rpm engine speed and 1000 HP at 2000 RPM is 2626 TQ and the same truck with the converter locked might make 1200 HP at 3000 RPM which is 2100 TQ and exactly what the dyno would display with the converter locked.

Shift spikes on the dyno are actually real horsepower, it's just not 100% instantaneous engine output derived HP, it's a combination of engine HP, plus converted rotational inertia (HP made earlier in the run and stored as engine/flywheel/converter momentum and then released to the rollers when the tranny shifts and drops rotational speed/momentum of the engine.
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Old 05-16-2016, 03:09 PM   #300
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On our shop's Mustang dyno, HP is measured from the roller acceleration rate, and TQ is calcuated based on engine speed which is synced with roller speed. It's impossible to trick the HP output with tire slippage and make it throw unrealistic raw HP figures, but it will throw unrealistic TQ numbers if there is slippage. For example, if everything was synced up correctly and then we made a pull with the torque converter unlocked, HP would drop some because of fluid coupling losses in the converter, but the engine torque numbers would increase a little because the unlocked converter might let the engine rev to 3000 rpm and make peak HP when the roller speed is less where it computes 2000 rpm engine speed and 1000 HP at 2000 RPM is 2626 TQ and the same truck with the converter locked might make 1200 HP at 3000 RPM which is 2100 TQ and exactly what the dyno would display with the converter locked.

Shift spikes on the dyno are actually real horsepower, it's just not 100% instantaneous engine output derived HP, it's a combination of engine HP, plus converted rotational inertia (HP made earlier in the run and stored as engine/flywheel/converter momentum and then released to the rollers when the tranny shifts and drops rotational speed/momentum of the engine.
That makes sense. Any idea why it's done this way? It's definitely easier to measure a load cell and rpm than acceleration. Or is this just because folks tend to be more interested in HP instead of TQ?
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