Dyno Numbers and Differences

[K20EF9]

Well a few of you know may have been involved or saw the chaos in the All Motor Dyno thread.

This thread was just made to discuss the differences between dynos. (Mustang, Dynojet, Dynapack, etc...)

It seems a lot of people here even tuners are misinformed on a few things that should be obvious. I'm sure there are also things I could learn from this as well.

So, post up your experiences, opinions, whatever, but please don't try and make shit up, or just come in here to babble non sense.

[K20EF9]

The big argument in the other thread was, is a dynapack actually whp or not..?

On a dynapack there aren't wheels on the car, but you don't remove the transmission therefore there is no way it could be flywheel hp. If anything you could call it hub adapter power if you want to be ignorant as you take the wheels off and put adapters onto the hubs then push the dyno pods onto the hub adapters.

Now for the people who think the dynapack reads flywheel hp and the dynojet reads whp than refer to this.

Ok so after a ridiculous amount of controversy and then eg clearing up the clutter the car I was referring too was actually tuned on a DynoJet first before they got there dynapack.



225whp revving to 8700 I think it was.

It then put out 238whp revving to 9200 on the dynapack and on the graph it actually shows about 225whp around 8600 rpms which I can't currently get ahold of.

I have no experience with the dynojet used, but from what I hear from everyone it reads very low from the others in the area. (Which is another thing that throws everything off.)

I'm not really trying to turn this into a hp argument between dynos, because lets be real dynos are tools used for tuning, and the track is where you see what a car really has.

There is also this video that shows a dynojet reading higher than a dynapack. A dynapack which just about everyone here seems to think only measures flywheel hp.

http://www.youtube.com/watch?v=UZXbk3o-xHg

[tilegend]

i dont know why anyone would think that anything other than an engine dynamometer can read actual flywheel HP...

i posted about dyno differences a while ago:
Dynojet Vs Dyno Dynamics

also another thing... different dynos can read different numbers... different settings, correction factors, obvious environmental factors etc...

the majority of dyno comparisons i've seen... dynapack usually reads the highest... (maybe thats where people get the false notion that they're flywheel hp)... then comes dynojets... after that i've usually seen dyno dynamics and other mustang dyno's read the lowest...

though this is a HUGE generalization cause i've also seen dyno sheets that say otherwise due to like i said... correction factors.



my suggestion is... stick with one tuner for consistency.


my preference for tuning would be a dyno dynamics or a dynapack.

[spade]

Bump I would like too know 2

[K20EF9]

Originally Posted by tilegend

i dont know why anyone would think that anything other than an engine dynamometer can read actual flywheel HP...

i posted about dyno differences a while ago:
Dynojet Vs Dyno Dynamics

also another thing... different dynos can read different numbers... different settings, correction factors, obvious environmental factors etc...

the majority of dyno comparisons i've seen... dynapack usually reads the highest... (maybe thats where people get the false notion that they're flywheel hp)... then comes dynojets... after that i've usually seen dyno dynamics and other mustang dyno's read the lowest...

though this is a HUGE generalization cause i've also seen dyno sheets that say otherwise due to like i said... correction factors.



my suggestion is... stick with one tuner for consistency.


my preference for tuning would be a dyno dynamics or a dynapack.

That is the thing people don't understand. The way IMW's dynapack is setup doesn't read high. Actually some people have said it reads low. But not only that you can easily lose 10hp alone just because of weather on one day.

I as well would prefering a dynapack. Other than not having to worry if a cars alignment is fucked, melting a strap, just breaking a strap, the car spinning, etc.. You seem to get a better tune on a dynapack.

[tilegend]

just look at what the majority of tuners are using:

Bisimoto: dynapack
Church Automotive Testing: dynapack
Locash Racing: dynapack
central florida turbo: dyno dynamics
suja 1 motorsports: dyno dynamics
xenocron: dyno dynamics
synapse turbo: dynapack
no limit motorsports: dyno dynamics

though there are a few that do use dynojets...
NRG Tech
T1 Race Development
Phearable
King Motorsports
Midnight Auto

maybe i'm a little bit biased but...

[K20EF9]

Actually I know when Tony from T1 was retuning his car he had to stop around 850 I think it was, because the dynojet wouldn't put enough load on the car at that power, so he had to finish tuning at the track.

I'm not sure if there would have been these problems on other dynos or not.

[egb18c5]

Originally Posted by K20EF9

I'm not really trying to turn this into a hp argument between dynos, because lets be real dynos are tools used for tuning, and the track is where you see what a car really has.

this is why they were made. the whp they give u is pretty much an estimate, a ball park figure as i would like to call it.

Originally Posted by tilegend

also another thing... different dynos can read different numbers... different settings, correction factors, obvious environmental factors etc...

and yet people are still hung up on numbers.

yeh some dyno's may give a better readin than others, and may be more accurate, but at the end of the day, its a tool and its used for tuning

[egb18c5]

if the engine is on the engine dyno, then it is getting the reading from the crank/flywheel.

power is loss through the drivetrain, with out a doubt. if it is connected to the hubs or the wheels are in contact with the rollers, it cant be considered flywheel hp.

[b16eg684]

bump good thread