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05-15-2016, 07:56 PM
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#281
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Name: BIGRPOWR
Title: SBTTFMF
Status: Not Here
Join Date: May 2006
Location: Garage-Majal
Member`s Gallery
Posts: 3,795
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Quote:
Originally Posted by jimbo486
A dyno video on Facebook showed up in my feed earlier.
2348hp/4002ft. lbs.!!
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unreal.
__________________
PPEI HARDWAY FIREPUNK GORILLA OFFROAD SCT'S / SPARTAN / EZ LYNK AFE S&B FLO PRO MBRP CONTACT US FOR ANYTHING DIESEL RELATED FROM INTAKES TO EXHAUST AND EVERYTHING IN BETWEEN 800-581-8986
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05-15-2016, 08:23 PM
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#282
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Name: STROKETHISF350
Title: Too Much Time
Status: Not Here
Join Date: Sep 2012
Location: HARFORD COUNTY MARYLAND
Member`s Gallery
Posts: 1,253
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Was this fuel only?
Sent from my iPhone using Tapatalk
__________________
06 ram 3500 CCLB dually l 100% fleece injectors l ppe dual fuelers l Hamilton 188/220 l 103# valve springs l ported & oringed head l arp 425s l he 351 over 475 built by me l efi live l fass l full billet 48re built by me
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05-15-2016, 09:07 PM
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#283
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Name: ehines218
Title: Too Much Time
Status: Not Here
Join Date: Apr 2014
Location: Touchet
Member`s Gallery
Posts: 365
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No
Sent from my SM-G900V using Tapatalk
__________________
Weston 6x.013, Borg Warner S369xe, Homemade intake with AFE filter and AFE intake horn, tunnel ram, 5 in stright pipe to 6 in homemade diamond stack, built auto, Quad adrenaline 1000/4k and soon
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05-15-2016, 09:14 PM
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#284
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Name: fatty
Title: VE
Status: Not Here
Join Date: Mar 2009
Location: SW Idaho
Member`s Gallery
Posts: 957
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Was it corrected?
__________________
91.5 W250
2019 F350
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05-15-2016, 09:45 PM
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#285
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Name: 02Dodge2500HO
Title: Too Much Time
Status: Not Here
Join Date: Jun 2007
Location: Louisville Ky
Member`s Gallery
Posts: 285
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Quote:
Originally Posted by fatty
Was it corrected?
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It was awesome I know that.
__________________
06 Dodge 2500 4x4 QCSB. Auto, S&B intake, 4 in exhaust, Airdog 150, 100hp II injectors, Edge CTS, Garmon stage 3, tuning by Innovative diesel
7.96 at 86.00 1/8mile 635hp
Soon: 464, 100%, duals
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05-15-2016, 09:50 PM
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#286
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Name: LAmiller
Title: THE KT-BOUNDARY
Status: Not Here
Join Date: Aug 2006
Location: Plain City, OH
Member`s Gallery
Posts: 3,603
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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.
__________________
04.5 QDLB 4x4 Diesel Power Challenge 2014/2015 Champion, ODSS 6.70 Points Champion 2015/2016
06 RaceCab 4x4 Ulimate Callout Challenge 2016, 2017, 2018 Champion, ODSS Pro Street Points Champion 2016
2016 QDLB 4x4, Firepunk EZLynk.
http://www.shop.firepunk.com
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05-15-2016, 09:55 PM
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#287
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Name: SHughes
Title: Too much is never enough!
Status: Not Here
Join Date: Jan 2008
Location: Bellevue, NE
Member`s Gallery
Posts: 9,267
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Awesome!
Just so you know, I'm not as smart as I think I am.
__________________
Quote:
Originally Posted by Joesixpack
That statement just reduced the collective IQ of the entire forum.
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05-15-2016, 09:56 PM
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#288
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Name: madmikeismad
Title: So mad
Status: Not Here
Join Date: Dec 2009
Location: Newalla, OK
Member`s Gallery
Posts: 14,347
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Quote:
Originally Posted by fatty
Was it corrected?
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Probably, to keep it fair with all the others who would actually want corrected.
__________________
Mike Hill
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05-15-2016, 11:12 PM
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#289
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Name: Nootch
Title: nosprkreqrd
Status: Not Here
Join Date: Jan 2013
Location: Ft. Mcmurray
Member`s Gallery
Posts: 1,359
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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.
__________________
Clever.Wise.Mechanic.
Spark plugs are for those who can't handle the pressure
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05-16-2016, 06:34 AM
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#290
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Name: 4x4dually
Title: Moderator
Status: Not Here
Join Date: Jan 2007
Location: Stillwater, OK
Member`s Gallery
Posts: 31,789
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Quote:
Originally Posted by jimbo486
2348hp/4002ft. lbs.!!
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Quote:
Originally Posted by STROKETHISF350
Was this fuel only?
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You bet.
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05-16-2016, 09:44 AM
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#291
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Name: atvracn08
Title: Too Much Time
Status: Not Here
Join Date: Aug 2010
Location: .
Member`s Gallery
Posts: 294
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Quote:
Originally Posted by LAmiller
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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What kind of dyno was that? Ours measures rpms off of the roller as well.
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05-16-2016, 09:48 AM
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#292
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Name: Oliver77
Title: Diesel Enthusiast
Status: Not Here
Join Date: May 2010
Member`s Gallery
Posts: 132
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Quote:
Originally Posted by fatty
Was it corrected?
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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.
__________________
98 ECLB 12v 5sp, 712/1358- Sold
2010 dodge G56- S&S 10mm, Exergy 100% overs,
2nd gen swap, 472 numbers coming
soon.
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05-16-2016, 10:09 AM
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#293
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Name: Diesel Tech
Title: #1 Crusty Old Fart
Status: Not Here
Join Date: Apr 2006
Member`s Gallery
Posts: 1,231
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Quote:
Originally Posted by LAmiller
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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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
__________________
Tuners of quick and fast Duramax pickups.
"I would rather lose going fast enough to win than win going slow enough to lose."
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05-16-2016, 10:44 AM
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#294
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Name: phale
Title: Too Much Time
Status: Not Here
Join Date: Dec 2006
Member`s Gallery
Posts: 935
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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.
__________________
ANARCHY DIESEL TUNING
EFI Live Beta Tester Cummins/Duramax tuning
423-506-7427
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05-16-2016, 11:39 AM
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#295
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Name: Dallas @ HSM
Title: Rookie Monster
Status: Not Here
Join Date: Jan 2015
Member`s Gallery
Posts: 144
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^^^Fact^^^
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05-16-2016, 12:26 PM
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#296
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Name: Diesel Tech
Title: #1 Crusty Old Fart
Status: Not Here
Join Date: Apr 2006
Member`s Gallery
Posts: 1,231
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Quote:
Originally Posted by phale
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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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.
__________________
Tuners of quick and fast Duramax pickups.
"I would rather lose going fast enough to win than win going slow enough to lose."
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05-16-2016, 12:29 PM
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#297
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Name: CorneliusRox
Title: Seasoned Rookie
Status: Not Here
Join Date: Dec 2012
Location: Detroit, MI
Member`s Gallery
Posts: 4,154
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Quote:
Originally Posted by phale
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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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?
__________________
Corey - BSME '21 Tesla Model 3 Perf
'22 DMax AT4 2500
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05-16-2016, 12:43 PM
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#298
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Name: crackerman
Title: Too Much Time
Status: Not Here
Join Date: Jan 2010
Member`s Gallery
Posts: 1,800
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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.
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05-16-2016, 01:47 PM
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#299
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Name: Big Blue24
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2008
Location: Cedar City, UT
Member`s Gallery
Posts: 6,310
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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.
__________________
95' 2wd Junker Drag Truck
1502 HP Fuel-Only 12mm P7100 Pump
SXE 472 over GTX55 116mm
OEM 12v Block
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05-16-2016, 03:09 PM
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#300
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Name: CorneliusRox
Title: Seasoned Rookie
Status: Not Here
Join Date: Dec 2012
Location: Detroit, MI
Member`s Gallery
Posts: 4,154
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Quote:
Originally Posted by Big Blue24
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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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?
__________________
Corey - BSME '21 Tesla Model 3 Perf
'22 DMax AT4 2500
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