Stock 600 Dyno results

[Rammin On]

I ran the new truck on the dyno (dynojet) today in totally stock configuration with 413 miles on the clock ... 3500 SRW 6-speed



Best run was 270. 2 HP / 477. 6 TQ



The torque reading is off because for some reason the pickup wouldn't read right. 477. 6 was the only reading out of 6 runs! ... . we tried taping the damper to no avail ... best we could figure was the paint is new and shiney interfering with the photocell ... didn't want to hold the dyno up anymore trying to get a reading ... we were going to paint it flat black ... wait for it to dry and try again ... . but as I said ... didn't want to hold up the show ...

 

[Gary - K7GLD]

I thought that same reflective pickup was used for both HP *and* torque - surprised one would register correctly but not the other...

 

[Rammin On]

The pick for RPM is used for the torque reading ... you can get HP only without the pick-up working ...



There was a Viper there that made over 720HP and 900+ TQ ... . that was neat!

 

[Gary - K7GLD]

Now that I think about it, that's right - there were no torque readings at last year's May Madness at Las Vegas because their RPM pickup was either busted, or they didn't want to take time to set up for it - had to manually compute for torque

 

[jwilliams3]

270hp at the ground, nice!



--Justin

 

[robertyoke]

my 03 auto 305/555 put down 269. 1hp on a dynojet when it was stock w/1500 mi on the clock, did cummins lie a bit on the new numbers or the old, it seams as there should be more of a difference than 1 hp.

also it made 543. 38#ft of tq

 

[Spooled-up]

robertyoke,

Could the difference between dyno readings be between a stick and an auto? I mean, if you dyno two trucks that are essentially the same, except for the transmission, which one would produce more hp/torque? Would there be a difference?

 

[Vaughn MacKenzie]

My 4x2 put down 269. 9 and 499tq on the dynojet at Shelley Automotive but that dyno generally gives nice numbers. Mine's a 2003 HO. Had about 2000 miles then and was bone stock.



Vaughn

 

[Dkevdog]

Originally posted by Gary - KJ6Q

Now that I think about it, that's right - there were no torque readings at last year's May Madness at Las Vegas because their RPM pickup was either busted, or they didn't want to take time to set up for it - had to manually compute for torque

It was because they didn't want to take the time. When we ran the So Cal trucks on a Dyno Jet last year, that was what slowed us down. This year at AFE, the Mustang was using an external pickup to grab a reading from a piece of magnetic tape placed on the harmonic balancer. Worked flawlessly every time and was very quick too.



Kev

 

[robertyoke]

Re: robertyoke,

Originally posted by Spooled-up

Could the difference between dyno readings be between a stick and an auto? I mean, if you dyno two trucks that are essentially the same, except for the transmission, which one would produce more hp/torque? Would there be a difference?

well I have heard that the autos give up some hp to the manual trans. I guess you need some power to pump the fluid around. That makes the 600 look even weaker, but it could be the different dyno.

 

[FATCAT]

?????????

Originally posted by jwilliams3

270hp at the ground, nice!



--Justin

270hp & 477 tq ... . thats pretty sad. Sounds like a lot of Marketing BS put out by DC. Probably could sue them for false Advertisment ... 325/600.

 

[RustyJC]

Well, it does make me feel pretty good about my pore ole noisy, smokey, rattling 2nd generation 5th wheel tower's 347 BHP/762 lb-ft to the ground on a Dynojet 248C. Maybe she ain't totally ready for pasture yet!



Rusty

 

[swexlin]

270hp & 477 tq ... . thats pretty sad. Sounds like a lot of Marketing BS put out by DC. Probably could sue them for false Advertisment ... 325/600

ALL Manufacturers advertise FLYWHEEL numbers on an ENGINE dyno. 325/600 are what the ENGINE itself produces on the dyno.



Typically, one can expect a 20% reduction in those numbers when measured at the rear wheels, so 270/477 TO THE GROUND sounds about right.

 

[bzingre]

HP but NO Torque???

That is the first thing that tells me that these performance chassis dynos are not the best way to dyno our trucks. HP is a calculated quantity, torque is measured. HP = TQ * RPM / 5252. How can you get HP without knowing TQ? I'm going to get on a truck chassis dyno that can pull the engine down, find peek torque, and give the true story on what these trucks can really do.

 

[RustyJC]

Actually, these inertial chassis dynos do back into torque by reverse-calculating it from BHP. They measure rate of acceleration of a drum of known inertia - that (work performed per unit of time) gives BHP vs road (drum) speed - the BHP vs MPH curve that is standard with no engine speed pickup. From that, of course, one can back into the torque by knowing engine RPM at each road speed point and using the calculation Q = (5252 x RWHP) / N where Q = torque and N = engine RPM.



It's a whole different beast than a load (water brake or eddy current) dyno that measures steady state torque at a given drum speed then calculates RWHP.



Rusty

 

[bzingre]

Thanks

Thanks for the info...

 

[Vaughn MacKenzie]

Dyno type

It depends what type of dyno you are talking about when it comes to sensing and measuring HP and Torque. To sum it up. . .



Dynojet. . . measures rate of acceleration as Rusty explained. It does not sense any loads but can easily calculate HP based on "work being done" which is rate of mass acceleration. Torque cannot be known without knowing engine RPM, because torque is a measure of twisting force, variable by tire size, gearing, etc. ; not a measure of work being done (Which is horsepower).



Mustang. . . measures force applied to load cell, in other words it is measuring torque. So why can't we just use this number? Because it is completely useless without knowing engine RPM and Horsepower. HP is calcualted on a Mustang by the computer plugging in the sensor values and drum speed (and possibly rate of acceleration but I doubt it) and comes up with a HP number, which then is available to compute RPM



Comprendemundo?



In summary Horsepower doesn't give a rip how it's generated . . . RPM, gearing, tires, driveline, etc. etc. doesn't matter one iota.



Torque is a different deal. . . all the above greatly impact what is produced by the engine and how it's applied to the ground and measured.



Vaughn

 

[Prairie Dog]

You've also got to remember that running a truck on the dyno takes the intercooler out of the equation so numbers will be lower. I can guarantee it's worth 60 to 80 H. P. or more.

Also, a fan placed in front of the truck is nothing like the airflow it gets moving down the road.



Scotty