6.0L Power Stroke Engine and DrivetrainDiscussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.
I have a serious qustion about Dyno machines. We live in Ohio and taking a vehicle to E Check Stations and putting them on rollers is terrible for drive train, according to mechanics. If that is true, I guess the Dyno's are bad too, right? The theory is since the drive train is not pushing the 7800lbs or whatever weight your vehicle is, it is free wheeling. I have read that it is just as bad as free revving an engine in neutral or with the clutch pushed in.
I have had my Harley on a Dyno and seemed to have no ill effect.
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2007 F-350 CREW SRW Lariat Outlaw(Bought New By Me)
This Thing Is Going To 200K With Me Behind The Wheel!
Dynos, generally, have a resistance mechanism built in. Your vehicle is not free wheeling. And your Ohio test stations maybe the same. Just because you do not see the resistance source does not mean it is not there.
RoyC
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2005 Limited, 6.0L PSD, 4X2, Mineral Gray, 3.73 LS. Excursion Build date 02-08-05 6.0L 2005MY Engine Build date 01-03-05 Huntsville, Ala.
2005 50th anniversary Thunderbird Red with all
options except hardtop.
Old Ride: 2003 Excursion 6.0 L March 2003 Build 73,000 with no significant issues.
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Dynos, generally, have a resistance mechanism built in. Your vehicle is not free wheeling. And your Ohio test stations maybe the same. Just because you do not see the resistance source does not mean it is not there.
RoyC
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I agree and assumed there is resistance. I am curious to see others input also.
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2007 F-350 CREW SRW Lariat Outlaw(Bought New By Me)
This Thing Is Going To 200K With Me Behind The Wheel!
Yes, the good dynos are capable of "Loading" up and stressing your truck. Just check out the waiver the dyno shops have you sign. Unless you load a diesel on a dyno it won't make any HP/TQ.
JMHO
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2006 Dark Slate F350 CC LB 6X6 Lariat Tow Boss Complete with training wheels. Vegetarian, an old indian word for bad hunter!
K&N Intake, Coolant filter, Recon smoked LED litght: tail, Clearance, Center bumper, 3rd brake, Fat fender, Pressure pro TPMS, Firestone air bags, Alpine/Infinity/Polk sound system, Autometer Phantom EGT,Trans,Boost gauges above the rearview mirror.
Performance checking chassis dynos in commercial shops are typically inertial -- the roller drums have a "calibrated" rotational inertia and thus the dyno computer can calculate HP and torque based on acceleration rates.
Really good chassis dynos as used by automakers are electric or eddy-current dynos where the load can be varied so you can, with proper programming, simulate a variety of conditions from downhill coasting to towing heavy up the side of a mountain.
Emissions-checking rollers are also dynos, but they typically don't load things up to the same level. For starters, you're usually not doing WOT acceleration runs on an emissions-check dyno, but holding a particular engine speed against a small amount of load.
The chassis dynos used to certify emissions and generate EPA fuel-economy numbers (same test) on under-8500-GVWR vehicles are electric dynos that use a programmed load curve based on the "inertia weight" of the vehicle (eg, a 3598 lb vehicle will run in the 3400 lb inertia weight class, a 3602 lb vehicle will run in the 3600 lb inertia weight class) and an aero drag factor based on the drag coefficient and frontal area of the vehicle.
Our diesels are actually emissions-certified on engine dynos at the peak power point (wide-open go-pedal, dyno loaded to hold engine at peak HP rpm, coolant and CAC heat exchangers set to mimic their in-vehicle counterparts for temperature drop), in a "standard atmosphere" of 77 degrees F, 20% relative humidity, and a barometric pressure that escapes me at the moment (usually, they end up correcting to the standard B.P.). This is why we don't have EPA mileage ratings.
This is changing somewhat for 2008 and beyond, with new testing divisions based on vehicle weight, and "footprint" (wheelbase x tread width), and interior volume, and, for all I know, phase of the moon and sunspot activity. My friends who work in OEM compliance departments have been in full-scramble mode since they were announced. They'll meet the deadlines, but it took a lot of work just understanding what exactly they were being asked to meet on some 5-dimensional matrix.
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AutoJim
Former Cooling Guy
'99.5 F350 Lariat CC SRW 4x2, 7.3L 4R100
'99 Mustang Cobra, SCCA Solo2 E Street Prepared
'97 Dodge Neon, SCCA ITA/STU/EP Club Racing
It's already been answered, but if you think about it, how could it measure power without resistance? [img]/ubbthreads/images/graemlins/laugh.gif[/img]
__________________ 2004 EB Excursion, 4x4, 6.0, Magnaflow Exhaust, Isspro Gauges in an under cubby pod, Fumoto, V code front springs, Revo 285's and bubba lights
"Treat me good, I'll treat you better; treat me bad, I'll treat you worse." - Sonny Barger
Here in Nevada, they dyno smog test the Diesels-----What the tester is looking for is visible "smoke" under load----there is some resistance on the rollers, or test could not be performed correctly----My truck has been done twice, and they only run it about to 2500 rpms for approx 10 seconds----I feel they are doing no damage to my truck----JMHO---Supercrew632
Anyone know If Mass dynos Diesels...None of mine have ever been...
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05' F-350 6.0L Diesel Crew Cab Long bed sitting on Brentz Wheels Custom Billet Dually 22's, Kenwood Indash Nav, Sirrrus Sat, HD Radio, Nintendo game Cube, 2 - 7" Tv's in head rests, Dual MTX 10" Subs behind seat, Arp Studs, Innovative Diesel SCT tuned for Snow Performance Stage III Meth kit, Bully Dog 5" turbo back exhaust, AFE Stage II w/ProGuard 7 Cold Air Intake, Remote Start. 03 Turbo, dam the whistle is Insane! @ 38 PSI http://www.youtube.com/watch?v=M2zEFb6bFLc - Video
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