Dynojet vs. Mustang?
Burning Brakes
Joined: Jan 2001
Posts: 1,169
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From: Manhattan
Re: Dynojet vs. Mustang? (T1Kilr)
don't know the differences, but generally the mustang has lower numbers compared to the dynojet.
what the magazines love about the dynojet is it's consistancy from one machine to the next.
what the magazines love about the dynojet is it's consistancy from one machine to the next.
Racer
Joined: Nov 2000
Posts: 253
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From: battle creek mi
Re: Dynojet vs. Mustang? (T1Kilr)
the magazines love dynojets because they receive them for their "shops" dynojets have their place as do mustangs. i'm prejudiced,i have a mustang in my garage,the thing that i like about the mustang is its ability to do part throttle tuning...dynojets can only do full throttle tuning accurately. i use mine to simulate road loads....the funny thing is..none of my neighbors has figured out whats goin on in my garage :D
Instructor
Joined: Feb 2002
Posts: 197
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Re: Dynojet vs. Mustang? (1985z51)
Dude, you are so my role model. A freakin Dyno in your garage is the most insane and badazz idea I've ever heard. I thought I was nutz for wanting just a lift, but now I just have to think of you. Now I want one...hehehe. :cool: :cool: :cool:
Race Director
Joined: May 2001
Posts: 14,165
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Re: Dynojet vs. Mustang? (T1Kilr)
Remember that DynoJet is the official dyno of Nascar and several other things. Sure it's a marketing trick to give away dyno's to magazines and such, but it works. It also means you have something to compare to. There will be variation between any two dyno's, but dynojets do seem to be consistent. Also since they are the official dyno of Nascar and they are on Horsepower TV, when either of these people post dyno numbers, I can accurately compare them.
The dynojet is basically the standard by which hp is measured. No matter which one is more accurate, dynojet or mustang, if somebody says they made 500 hp on a dynojet I know how that compares to my 336 dynojet. Even if Mustang is more accurate, unless everything is done on a Mustang, you cannot compare it to anything.
Besides, how accurate can it be if it has Mustang in the name? You know the Mustang cars always perform like everybody says they should :rolleyes:
The dynojet is basically the standard by which hp is measured. No matter which one is more accurate, dynojet or mustang, if somebody says they made 500 hp on a dynojet I know how that compares to my 336 dynojet. Even if Mustang is more accurate, unless everything is done on a Mustang, you cannot compare it to anything.
Besides, how accurate can it be if it has Mustang in the name? You know the Mustang cars always perform like everybody says they should :rolleyes:
Drifting
Joined: Feb 2002
Posts: 1,952
Likes: 2
From: Little Rock Arkansas
Re: Dynojet vs. Mustang? (Nathan Plemons)
I agree exactly with what 1985Z51 said... That's the beauty of the Mustang; it's an actual load type dyno which means you can accurately vary the driving conditions like you would see on the street. I actually use both dynos, a friend of ours has the Mustang and I use it to tune on, for raw numbers we use the Dynojet. It kind of breaks down like this: If you want to tune your car across a wide array of conditions including idle, part throttle, cruise, -and- WOT, you use the Mustang. If you want to impress your friends with how much power your vehicle makes you use the Dynojet. Dynojets are very accurate when compared with one another and are actually closer to our Stuska engine dyno at peak power than the Mustang is. Both have their respective places and both are invaluable tools for tuning. The sad thing about the whole situation is that there is not an SAE standard for chassis dynos, so different brands (and load types) do read differently! BTW: The Dynojet may be the dyno of NASCAR, but the Mustang is the OEM manufacturer's darling...So, knowing that, now which one is better??
-Jeb Burnett
-Jeb Burnett
Racer
Joined: Nov 2000
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From: battle creek mi
Re: Dynojet vs. Mustang? (jburnett)
i was hopin someone would reply like this. it lets me know that this forum has people in it that use their head for more than a hatrack! remember...the only elephant in the circus that has a clear view is the one in the lead! dynojets will always be more repeatable...its a simpler machine. the main reason i chose to use a mustang is the ability to road test without goin anywhere(i'm lazy)... that and i didn't feel comfortable about havin a 4500# drum spinnin above the ground with only two bearings supporting it. mine is floor mounted and it has 8 bearings supporting the weight of the drums and the flywheel. I've only had mine up and runnin for about a week now..one thing that surprises me is how much 350 rwhp actually is..heck my vette only puts out 165 rwhp at 4400rpm(for now!) really i liked the dynapack system...the only problem is that i also like to eat!! :eek:
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Racer
Joined: Nov 2000
Posts: 253
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From: battle creek mi
Re: Dynojet vs. Mustang? (T1Kilr)
foolish me...i just realized that no one really answered your question. a dynojet has a roller wheel that has a specific weight,using newtons law, (force=mass x acceleration) the computer calculates how much force is applied to the drum based on how fast the drum can be accelerated from one rpm to the next. a mustang dyno also has a roller assembly that has a specific weight.. on mine its about 2000#. when i put a car on mine i need to know the weight of the vehicle so that the control box can add electrical load to the weight of the rollers..this is where i get my road load from. all the calculations the computer does are based on the shaft speed of the dyno and the load cell attached to it....remember this..torque is measured...horsepower is calculated. thats dynojet versus mustang in a nutshell. i hope this clears things up a little :crazy:
Pro
Joined: Oct 2001
Posts: 621
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Re: Dynojet vs. Mustang? (1985z51)
The fascinating thing to me is that due to the "accelerate a dead weight" nature of the Dynojet, it actually measures power directly (by the rate of change in kinetic energy of the drum) and back-calculates the torque. This in contrast to a load dyno (chassis or engine) in which torque is measured and then combined with RPM to calculate the horsepower.
You can get into all kinds of philosophical discussions about what power really is, but for me the notion of measuring how quickly a mass can be acclerated is the purest expression of power. You're seeing how quickly the machine can transfer energy to a mass rather than how much work could be done at steady RPM. I don't drive at a steady RPM and wide open throttle.
You can get into all kinds of philosophical discussions about what power really is, but for me the notion of measuring how quickly a mass can be acclerated is the purest expression of power. You're seeing how quickly the machine can transfer energy to a mass rather than how much work could be done at steady RPM. I don't drive at a steady RPM and wide open throttle.
Racer
Joined: Nov 2000
Posts: 253
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From: battle creek mi
Re: Dynojet vs. Mustang? (Monty)
I think I'll keep my *********! I've had a lot of fun with my mustang..the best part for me is learnin and gettin paid at the same time. Just when i think i know alot,someone shows up and gives me a lesson! the guys that impress me the most are the ones that make the most of what they have..they are usually very well prepared and dont waste any time. :rolleyes:
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
Re: Dynojet vs. Mustang? (T1Kilr)
One example is my LT4. Essentially stock made 260 RWHP on Mustang Dyno.
On a DynoJet the understood number is 300 for same car.
To back that up, my brother's 2002 Z28 (310 HP) made 268 RWHP with an airbox-these cars are very close to 300-310 on a DynoJet.
Be aware that Mustangs can also change the inertia setting to replicate a DynoJet dyno or no inertia or anywhere in between. My dyno runs were no inertia at 300 rpm per second from 1000 rpm to 6400 (fuel cut). The dyno actually paced the engine rpm rather than the engine simply accelerating as fast as it could like a DynoJet.
I'm not too interested in the peak number (see that I'm only now making what most people's stock LT4's are:)) but making changes and using the same dyno. I hope to visit it again early next year with some more changes.
:)
On a DynoJet the understood number is 300 for same car.
To back that up, my brother's 2002 Z28 (310 HP) made 268 RWHP with an airbox-these cars are very close to 300-310 on a DynoJet.
Be aware that Mustangs can also change the inertia setting to replicate a DynoJet dyno or no inertia or anywhere in between. My dyno runs were no inertia at 300 rpm per second from 1000 rpm to 6400 (fuel cut). The dyno actually paced the engine rpm rather than the engine simply accelerating as fast as it could like a DynoJet.
I'm not too interested in the peak number (see that I'm only now making what most people's stock LT4's are:)) but making changes and using the same dyno. I hope to visit it again early next year with some more changes.
:)
Intermediate
Joined: Nov 2000
Posts: 35
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From: Dallas GA
Re: Dynojet vs. Mustang? (T1Kilr)
quick survey...
who races at part throttle?
how many of you mustang dyno users have 3D fuel and timing mapping wide band O2 sensors on their cars? 3d really isn't needed but rpm/map specific fuel/timing tuning capabilities?
running my car with the lap top tuning on a dynojet at WOT adjusting any given air fuel or timing issue also changes the partial throttle responce map in the tuning box. TecII's and commander 950s do the same. I run on a Dynojet 248c. I guess i don't see why you would need to run at part throttle unless your having EGR problems or your trying to pre-set your cruise control to a certain MPH.
who races at part throttle?
how many of you mustang dyno users have 3D fuel and timing mapping wide band O2 sensors on their cars? 3d really isn't needed but rpm/map specific fuel/timing tuning capabilities?
running my car with the lap top tuning on a dynojet at WOT adjusting any given air fuel or timing issue also changes the partial throttle responce map in the tuning box. TecII's and commander 950s do the same. I run on a Dynojet 248c. I guess i don't see why you would need to run at part throttle unless your having EGR problems or your trying to pre-set your cruise control to a certain MPH.
Racer
Joined: Nov 2000
Posts: 253
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From: battle creek mi
Re: Dynojet vs. Mustang? (DOCTOR J)
the last comment is the main reason i have a dyno...how smart is it to do a full throttle run on the street! ever had to peel someone out of one of these cars? using the car for the dyno is a good idea except for that situation...to this day i havent hit anyone walkin in front of my garage! :rolleyes:
Racer
Joined: Nov 2000
Posts: 253
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From: battle creek mi
Re: Dynojet vs. Mustang? (DOCTOR J)
oops again.....i guess i need to stop posting in the middle of the night :sleep: i bought my mustang dyno because it was too good of a deal to pass up..right now i'm still learnin how to best use it! i do agree with your statement about field testing,safety was my only concern...i've been guilty of reading my laptop when i should have been lookin forward...thank god for data-loggers. sorry for the inference :( good luck with the boat tuning!
Melting Slicks
Joined: Oct 2000
Posts: 3,426
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From: Heidelberg PA
Cruise-In V Veteran
Re: Dynojet vs. Mustang? (1985z51)
1985z51,
I saw that you noted your car puts out about 165hp. This actually makes me feel pretty good. i go to a local shop that has a Mustang Dyno and was a little concerned that my car was only putting out 212hp with my current mods. I was told that the Mustang Dyno numbers are approximately 15% lower than the Dynojet.
I had alot of fun running the quarter mile and 0 to 60 times.
There is no question, I have Mustang envy :D ( excuse the pun), I mean Dyno envy.
I saw that you noted your car puts out about 165hp. This actually makes me feel pretty good. i go to a local shop that has a Mustang Dyno and was a little concerned that my car was only putting out 212hp with my current mods. I was told that the Mustang Dyno numbers are approximately 15% lower than the Dynojet.
I had alot of fun running the quarter mile and 0 to 60 times.
There is no question, I have Mustang envy :D ( excuse the pun), I mean Dyno envy.
Racer
Joined: Nov 2000
Posts: 253
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From: battle creek mi
Re: Dynojet vs. Mustang? (85vet)
remember that ive only been using this dyno for a few weeks....i discovered that i haven't calibrated the load cell properly! the steep learning curve continues..some of the things that have surprised me..two cars with the same rwhp at peak...one can do the exact test 4 seconds faster! i'm no engineer but i know which car i want to take home! :D