Superflow vs Dynojet vs other Dyno's
- Thread starter Gas Man
- Start date
Fibersnake
Banjo Playing PsychoBilly
As said before in theroy they should all be the same, however with a Superflow equipped with an eddy current brake compared to typical inertia roller only DynoJet, the DJ numbers tend to be higher. However with the proper setting on the WinDyno Program, the DynoJet has sweep curves and inertia correction factors to get them much more accurate, the problem is not too many DJ shops use them and/or make all the adjustment for each run.
The dual blower option for the Superflow does help on simulating the real road simulation, however the main reason that it is sold is so that an operator can do continueous dyno runs longer as well as higher horsepower while using the eddy current by bein able to disapate the heat generated better and quicker.
I agree with GasMan though, that if 90% of the shops use DJ, it is hard to get an apples to apples test, however if 50% of those DJ runs are not as accurate and corrected as they possibly can be, it does mean that allot of the numbers are high and inaccurate.
Have to ask yourself, what is the purpose of doing a dyno run in the first place. If it is to tune, great machine, if it is to talk biggest numbers, well then unless the machines were all ran under same condition, then just inflated the hell out of the rear tire with a lighter one on it (on an inertia type which is the vast majority of MC Dyno used by shops), have them adjust the altimeter to sea level even if you are not at such and adjust the barometric pressure and you can get unrealistic numbers also.
Best thing is to use it for tuning and let the ass decide if it has the poinies to make you happy.
The dual blower option for the Superflow does help on simulating the real road simulation, however the main reason that it is sold is so that an operator can do continueous dyno runs longer as well as higher horsepower while using the eddy current by bein able to disapate the heat generated better and quicker.
I agree with GasMan though, that if 90% of the shops use DJ, it is hard to get an apples to apples test, however if 50% of those DJ runs are not as accurate and corrected as they possibly can be, it does mean that allot of the numbers are high and inaccurate.
Have to ask yourself, what is the purpose of doing a dyno run in the first place. If it is to tune, great machine, if it is to talk biggest numbers, well then unless the machines were all ran under same condition, then just inflated the hell out of the rear tire with a lighter one on it (on an inertia type which is the vast majority of MC Dyno used by shops), have them adjust the altimeter to sea level even if you are not at such and adjust the barometric pressure and you can get unrealistic numbers also.
Best thing is to use it for tuning and let the ass decide if it has the poinies to make you happy.
HDLARRY
Active Member
Fiber, your comments are dead on.
I happen to have my bike on two different dyno's last year and again early this year. One was a Dynojet at Sturgis and the other was the Superflow here locally. In my case the numbers were near identical but the weather and altitude was substantially different. I have to assume that both units must have been setup properly for the numbers to have matched so closely. I'm talking about 1% difference which in my opinion is very good.
I happen to have my bike on two different dyno's last year and again early this year. One was a Dynojet at Sturgis and the other was the Superflow here locally. In my case the numbers were near identical but the weather and altitude was substantially different. I have to assume that both units must have been setup properly for the numbers to have matched so closely. I'm talking about 1% difference which in my opinion is very good.
Fibersnake
Banjo Playing PsychoBilly
HDLarry,
That is very good to hear for it does seem that both were getting the programs dialed in to give something of use. I hope the numbers were to your liking by the way.
Safe riding to all and lets all get back to something we can all agree on and that would be Chopper Dave and Old Hippy's fine art!!! :2thumbs:
That is very good to hear for it does seem that both were getting the programs dialed in to give something of use. I hope the numbers were to your liking by the way.
Safe riding to all and lets all get back to something we can all agree on and that would be Chopper Dave and Old Hippy's fine art!!! :2thumbs:
Chopper Dave
SIICK!!!
yep...I agree also!
:2thumbs:
HOOLIGAN
SICK BOY
if it makes your eyes roll back in your head when you smash the throttle, and you can do burn outs... it's got enough power. who cares what the numbers are on a piece of paper. i think a lot of the people who dyno their bikes dont do it for tuning purposes, they do it for bragging rights. i dont care if your bike has 150 HP with 110 ft lbs. "IT DONT MEAN SHIT IF YOU DONT KNOW HOW TO RIDE IT!!" if you're getting different numbers on different dynos then whats the point in the end your letting someone tune your bike using a fancy machine and charging you a shit load of money for it. You could get it dyno tuned one day, take it to a different dyno the next day, and they could change you whole set up. its all a ploy to get you to spend $$$. tune your bike the old skool way. Listen to it, see how its running and go from there.
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dogvet
Banned
I've worked with both.
A Dynojet typically can read as much as 10% from a Superflow. Not because either dyno is better, the Superflow has it's own atmospheric sensors built in (such as air density and vapor pressure) I believe the Dynojet relied on canned data for densities and manual temperature and barometric pressure inputs (at least that was how the old Dynojet worked that I was familiar with). When the Superflow is set up using the atmospheric values that Dynojet uses, the numbers end up much closer.
The only dyno numbers that are repeatable on any dyno anywhere are SAE corrected numbers.
A Dynojet typically can read as much as 10% from a Superflow. Not because either dyno is better, the Superflow has it's own atmospheric sensors built in (such as air density and vapor pressure) I believe the Dynojet relied on canned data for densities and manual temperature and barometric pressure inputs (at least that was how the old Dynojet worked that I was familiar with). When the Superflow is set up using the atmospheric values that Dynojet uses, the numbers end up much closer.
The only dyno numbers that are repeatable on any dyno anywhere are SAE corrected numbers.
TheDeadOne
Banned
Fiber and BB are both correct in there posts. But BB, I have to say that Fiber is probably more accurate than yours. 
But don't get me wrong here BB, yours works much easier and with much, much, much, much less explanations as Fibers! :lol:
I raced for 20 years, and one of my deals was a 500 CI Pro Stock Style Motor, Pontiac/Brodex, BME, KRYPTONITE, Comp. Cams, all the best stuff money could buy at the time, which happened to be "every year". :bang: The most sophisticated piece of engineering known to man within the "normally aspirated" engine world, also the last thing that can sometimes be put on a Dyno without "breaking it" or without taking it out of calibration when you exceed it limitations! Every time I went to the dyno, I had to purchase a minimum of 5 "NEW" input shafts for the dyno, and pay upfront for the required recalibration afterwards, with no questions ask! I BROKE A LOT OF THEM! :lol: And they tried to BREAK ME TOO! :lol: We'd dyno tested once to twice a year to compare new changes we had made.
And Fiber is very correct as to what he is saying, it's "ALL" relative to the operator! Inclusively "Comparisons" by shops as well!
Let me just shine a little light out here for you guys to chew on.
1) Owners want to dyno to see how much HP & Torque they've got, right?...More is Better, Right?
2) If the mechanic operating the dyno can give you better numbers by making a small or big change, you're going to want it, right?
3) Who make money on the changes?
4) Who makes money if they can show you better numbers?
5) Who is going to make money with no changes and better numbers?.... GET IT!...It's somewhat adjustable in the "programing" of all manufactures of dynos!
There are those that will take advantage of you, "not all", but some! It's in the best interest of their pockets! $$$$
So don't believe everything you hear or even see sometimes.
My best advise here is; "Be somewhat "Quietly Sceptical" until "PROOF" shows you otherwise!
"Horse Power Cost!...How Fast Can You AFFORD Too Go"!
Good Luck! :2thumbs:
But don't get me wrong here BB, yours works much easier and with much, much, much, much less explanations as Fibers! :lol:I raced for 20 years, and one of my deals was a 500 CI Pro Stock Style Motor, Pontiac/Brodex, BME, KRYPTONITE, Comp. Cams, all the best stuff money could buy at the time, which happened to be "every year". :bang: The most sophisticated piece of engineering known to man within the "normally aspirated" engine world, also the last thing that can sometimes be put on a Dyno without "breaking it" or without taking it out of calibration when you exceed it limitations! Every time I went to the dyno, I had to purchase a minimum of 5 "NEW" input shafts for the dyno, and pay upfront for the required recalibration afterwards, with no questions ask! I BROKE A LOT OF THEM! :lol: And they tried to BREAK ME TOO! :lol: We'd dyno tested once to twice a year to compare new changes we had made.
And Fiber is very correct as to what he is saying, it's "ALL" relative to the operator! Inclusively "Comparisons" by shops as well!
Let me just shine a little light out here for you guys to chew on.
1) Owners want to dyno to see how much HP & Torque they've got, right?...More is Better, Right?
2) If the mechanic operating the dyno can give you better numbers by making a small or big change, you're going to want it, right?
3) Who make money on the changes?
4) Who makes money if they can show you better numbers?
5) Who is going to make money with no changes and better numbers?
.... GET IT!...It's somewhat adjustable in the "programing" of all manufactures of dynos! There are those that will take advantage of you, "not all", but some! It's in the best interest of their pockets! $$$$
So don't believe everything you hear or even see sometimes.
My best advise here is; "Be somewhat "Quietly Sceptical" until "PROOF" shows you otherwise!
"Horse Power Cost!...How Fast Can You AFFORD Too Go"!
Good Luck! :2thumbs:
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