Dyno Test Results : What's up???

[John_P]

Jim:

In the December 2000 issue of "Truck Trend"
they dynoed a 2001 DEE/ETH 6-speed with
245 H. P. /505 Torque which was STOCK.

They placed the truck on a "Mustang"
Dynamometer and according to the results
the truck dynoed with the following
numbers: 180 H. P. (at rear wheels) and
604 Torque.

It would seem to me that yours should
be higher than it was. Maybe some of the
other 24 valve owners will give you some
insight on this.

-------
John_P

------------------
Red '96 4x4 2500 Auto 3. 54, TST #5, Major Pump Mods(By "Scheid Diesel") 370 Diamond B Injectors, Gov. Spring kit, AFC Spring kit, Banks Exhaust, Prime Loc, Cummins Chrome Kit,Psychotty Air Filter, Pro-Torque Converter, BD Valve Body, BD Pressure Loc, Isspro Gauges, Sendel 16" Alum Wheels w/ 33" BFGs

 

[TXRam]

Hey Jim,

I didn't see any kinda of boost module in your signature. That will definitely keep you from getting the full benefit of the injectors and the Diablo - probably only getting 1/2 to 2/3 of the full benefit.

Was the Torque Converter locked? That's the only way to get a good, true reading. Otherwise, it will show low, especially with the stock TC.

Considering both of these things, your # may be accurate.

 

[Mopar-muscle]

jim , 70% loss thru the transmission , wow , that would mean you would be more than your 281 , the los thru the trans is 20 maybe 30% .

the hp increase of the 4" and the k+n might be 25 tops . like someone else pointed out , if you don't have a way of defeating that hardline wastegate there is lost HP in not making more boost .

 

[TXRam]

I think he meant only 70% getting through the transmission.

 

[Terry]

I have operated dyno's for years and have never seen two that read the same.
Sometimes it will read different with just an operator change.
Some are way off on there calibration.
A dyno is much better at showing before and after numbers after a change is made to the engine or drivetrain.

------------------
99' 2500 SLT, Quadcab, Long Bed, 4x4, White/Driftwood, Agate Leather, 4WAL, Auto, 241HD, 3. 54 Limited Slip, Rancho 9000's, Air Lift Super Duty's, Reese Titan V, Hallmark Cachara LTD 9. 5ft Popup Camper, Boston Whaler Outrage 17'

 

[Jim Nunn]

I just had my first dyno test, which was disappointing. The operator was very unprofessional, and the presentation of the results was hand scribbled over a partial computer printout which the operator was unable to make work? All this for a quoted price of $158.

If that's not enough, the results IF anygood showed that at 59 mph my hp was 197. If you assume that 70% of the 235 rated stock hp is lost in the auto transmission, then maybe my equivalent flywheel hp is 197/. 7=~281 hp.

Should I be pleased with this number, IF ACCURATE? Maybe, but my Diablo power puck supposedly adds 60hp, my injectors supposedly add 40hp, then there's the 4" exhaust and K&N filter, all to increase horsepower.

HELP ME GET A GRIP

Jim Nunn

------------------
James L Nunn
2001 Flame Red Quadcab 2500 2wd, Diablo Power Puck, K&N, 4" exhaust, injector upgrade, brite lite, Viper Remote start, Turbo life saver timer

 

[RobbyRam]

I have my 3/28/01 DynoJet read-outs in front of me right now, and mine were done at a shop that regularly 'Dynos' very hot Mustangs, Cameros,etc. , and they have a lot of 'run' experience.
My absolute best run BONE STOCK with no mods, Auto transmission and 4:10's:
170. 2HP
332. 6 Torque at rear wheels.

Adding an 'EZ', DD2's, and a DTT Valve Body:
271. 8HP
527. 6 Torque at rear wheels.

The operator said if I had had a stick transmission, the numbers would be much higher.

However, he did give me the formula they use to get a pretty accurate BHP(Flywheel Horsepower):
If going from BHP to Rear Wheel, subtract 20% for an Auto Trans. But if going from rear wheel Dyno numbers to flywheel BHP/Torque, ADD 25%.
This formula on my truck means I have 340BHP and 658lbs. torque at the flywheel.
#ad
#ad
#ad
#ad
#ad
It feels like it too!
Bob

 

[Jim Nunn]

Originally posted by TXRam:
Hey Jim,

I didn't see any kinda of boost module in your signature. That will definitely keep you from getting the full benefit of the injectors and the Diablo - probably only getting 1/2 to 2/3 of the full benefit.

Was the Torque Converter locked? That's the only way to get a good, true reading. Otherwise, it will show low, especially with the stock TC.

Considering both of these things, your # may be accurate.

Thanks TXRam for your helpful reply. I"m looking into a boost module, and have talked to the BD people since the injectors came from them.

Thanks too for everyone who shared their comments. I'm definitely going to have another DYNO test someday, probably after my new TC and VB are installed. As for the test being done with the transmission locked up, I have no idea, since I wasn't even in the room when Cummins did the test.

Jim Nunn

------------------
James L Nunn
2001 Flame Red Quadcab 2500 2wd, Diablo Power Puck, K&N, 4" exhaust, injector upgrade, brite lite, Viper Remote start, Turbo life saver timer

[This message has been edited by Jim Nunn (edited 03-30-2001). ]

 

[PAYCHECK]

RobbyRam, do you know how much to subtract for a stick? thanx.

------------------
01 2500HD QC,SB,3. 54,5 spd,4X4,241HD,SLT+,Sport all black,fully loaded,all leather htd,jacobs e-brake,tow pack,camper pack,,full rhino lining bed and rocker panels,265/75r16 BFG ATs ko,nerf bars,everthing black,4'' Jardine,ultra lite pyro & boost on a-pillar,EZ,NO stickers except cummins on door,License plate-1 CUMN, NRA endowment life member

 

[RobbyRam]

Sorry Pay Check,
I don't, except for the DynoJet operator telling me that Stick cars and trucks are much easier to get consistant Dyno runs from and there's very little loss.
He did say that my new DTT Valve Body was harder to Dyno than the stock transmission. ??
Bob

------------------
Y2K Awesome Black LB 3500 QC SLT, 24Valve ETC ISB, 4x4, 4:10 LSD, DTT Custom prepared Auto transmission VB, Power Edge 'EZ', DD2's, K&N, Polished Stull Billet Grill/Fog inserts, Chrome Smitty-Built Step Rails, Mopar Chrome-Tipped Mud Flaps, A-Pillar mounted West-Tach Turbo/Pyro/Trans Temp gauges, Rancho 9000's, Diamond Plated Tool Box, + a bunch of other stuff. Fact:The First Fords' had 'DODGE' Engines! The new PSD's need them!

 

[TREEMAN]

Guys,if you want the ACTUAL to the ground HP & Torque readings find someone who has a Mustang Dynometer. Not only can you meaasure your hp & torque but you can do a quarter mile, assimilate a load,eg you can punch in the weight of your trailer & see what it do up lets say a 7% grade & it will put the it will the right amount of resistance on the rollers to assimilate those conditions,way cool!Its the most accurate dyno out there.

------------------
2001,2500 q-cab,auto 4x4,4. 10 anti-slip rearend. All options except leather seats. Line-x bed & tool box. Slide-in -removable rack,BFG 295,s ,Fender flares. Westin nerf bars,billet grill & fog inserts. Rancho,9000,s,Isspro gauges,
1994 2500,4X4,12 valve,bone stock for now

 

[RobbyRam]

TreeMan,
I asked David at Auto Expessions what he thought of the DynoJet vs Mustang Dynos.
He says they are very similar when measuring differences in HP/Torque before and after upgrades, however he feels the dynojet is more accurate as per numbers, and bases this on the many runs that he has done with Mustangs, Camero's, Rice burners, ETC. who have used both.
BTW, there's No Way your 1400 LBS Torque!

------------------
Y2K Awesome Black LB 3500 QC SLT, 24Valve ETC ISB, 4x4, 4:10 LSD, DTT Custom prepared Auto transmission VB, Power Edge 'EZ', DD2's, K&N, Polished Stull Billet Grill/Fog inserts, Chrome Smitty-Built Step Rails, Mopar Chrome-Tipped Mud Flaps, A-Pillar mounted West-Tach Turbo/Pyro/Trans Temp gauges, Rancho 9000's, Diamond Plated Tool Box, + a bunch of other stuff. Fact:The First Fords' had 'DODGE' Engines! The new PSD's need them!

 

[CUMINNTSTRKN]

everyone i have asked about dyno's say the dynojet is more repeatable. the advantage to a mustang for our diesels is there is a load so you can build boost much earlier than with a dynojet. on a dynojet my peak #'s were at 2200-2400rpm and on the mustang 1900rpm. i also gained 100ftlbs on the mustang.

------------------
2001 eth, ez box, dd2's
My Ram Pics

 

[Diesel Guy]

Also remember that a Mustang dyno won't take more than about 300 rwhp without tire slip. When the tire slips, the numbers go right out the window, which is usually why the torque values spike up.

 

[Bart Timothy]

I've seen over 400 hp on Edge's Mustang without any hint of tire slip. The Mustang does a much better job of simulating actual driving condidions than the Dynojet does because of its ability to simulate loads. If the operator of the Mustang is doing his job properly, the first run will be to take the vehicle up to 100 mph, put it in neutral, and then let the dyno coast down to 0 mph. This gives the computer a number it uses as a coefficient of tire and drive line friction it uses to determine actual power. The tire to roller contact area is probably pretty close on both dynos. The Dynojet uses a single large roller and the Mustang uses 2 smaller rollers. Both dynos, when operated by different people, can give different results. Most horse power readings which have been posted on the TDR have been rear wheel with the exception of lately when a few members are posting calculated flywheel numbers based on the wheel numbers.