dyno question to are sponsors
 

Hey everyone this thread is going to go out to are sponsors. I hope they will participate in this and help some to understand this process.

First I am going to kick this off with what I know. From doing some basic research I have come across the basic dyno companies, Dynojet, Mustang Dyno, and Dyno Dynamics. Now the part that gets me is all do the same basic thing and that measure whp, BUT none give the same reading. A Dyno Dynamic reads averagly 10-15% lower then a Dyno Jet. Also the Mustang Dyno reads a little lower then the dyno jet. This brings up the true ultimate question, and that is which one is the most accurate? Also why is there no standard set to these systems? Alot of people take there car to the dyno to get tuned, as others want to see what there car is putting out. It seems to me there is so much deceiving going to here that I find my self not knowing what to believe. On lets say a stage 1 turbo kit for your car, the retailer advertises 500 rwhp. Well maybe on the dyno he is running it on it does that but if you take it to a Dyno Dynamics dyno your running 10-15% lower then that. In my eyes thats kind of deceiving because your purchased a kit that does 500 rwhp. well the manufacture did all test on his lets say dyno jet so he isn't lieing, BUT WHAT IS THE TRUE WHP RATING? Do we just pick the graph that has the highest rating because it makes us feel more awesome or to make us feel better because no one wants to spend 7-8 grand on a kit and get 380 hp when 500 was advertised and your goal was 500. My point is there needs to be a standard between each company, and they should be able by now with technology to simulate a car driving on pavement.

OK I am now done with my ramping and this is the part I would like are sponsors to jump in, since they dyno cars every day.
First I would like to know what dyno your company has chosen.
Second, I would like to know why you chose that dyno.
Third, how does it compare to the other type of dyno's out there
Fourth and final question, which dyno do you think gives the most realistic results.

Any answers to the questions above would be awesome if you choose not to answer all of them. This is not for me or anyone to try and say the parts you sell are lieing about there actual hp rating but to educate us all.
Thanks
Frank

In for updates!

It would also be nice if they provide mutiple dynos so we can see an average gain as well as SAE corrected an uncorrected numbers -- many little factors will cause readings to vary.

Also note that across kinds of dynos, it is impossible to make meaningful comparisons in terms of raw values, although you should see similar % changes from a legitimate baseline across dynos (i.e., interpreting a gain of 10 whp on one dyno vs 5 whp on another for the same mod isn't clear, but from baseline both should show the same approximate proportionate improvement).

This is very important as we are seeing dyno charts posted constantly. But, to be honest, I feel it's hard to make a standard for dyno's because its not just different dyno's that effect the WHP outcome. Most people know runs that aren't done back to back cannot really be compared to each other. So even if everyone ran on the same dyno's they wouldn't produce constant numbers if they weren't done back to back in the same exact conditions.

Hey Toner....you're not gonna like this. Even when one certain type of dyno is used, the tuner can calibrate that dyno to give higher or lower numbers. I was just talking to someone yesterday who did a 275 baseline on a mustang dyno and then 330 with some bolt on's. If you know mustangs, those numbers are nearly impossible...those are dynojet numbers. Not to mention weather can make a difference of upwards of 10hp. Hell the same dyno will give you different results in consecutive pulls.

Its not an exact science and no one can really say this dyno reads accurately and this other one doesn't. If you take into account what the accepted drivetrain loss is for a rwd car (something like 12-15%) then the Z should put down around 280-290whp.

DynoDynamics put down around 255 stock. Mustangs 265. DynoJets 275 and dynapaks 285.

Tuners will tell you though that they prefer DD's and MD's because they put realistic load on the car and produce more consistent numbers.

Hope that helps!

A dyno should be more of an individual tool and not a comparison to others.
While a dyno can be a very good tool at showing your cars progression from X wheel horsepower to Y, that is just for your car and really can never be compared to others. On which dyno can be better than another is really just how the individual shop uses it and keeps it up to date with calibrations, software upgrades, etc.

I understand that and read all that. Thats what brings it back to one big decieving thing. If there all going to read different and possibly have no truth in the whp numbers then why have it. I feel there needs to be a standard on these machines that provide actual information and limit the operator from saying someones car is 500 whp when its really 350. This is the point i was trying to state in my first post.

I am sure they all do the same job. They all give different readings then and the big thing I wanna know is which one is the most accurate into displaying your real whp
Frank

Just grabbed this and think it might answer your question(s) but not directly.

Just how accurate is this dyno?

You can also get a higher/lower number by just straping the car down tighter.

I think the most important point here is a dyno is not purchased/used as a hp readout. A Dyno is used for tuning purposes. When we picked up our dyno we did not consider how high the HP read. The reason we chose our dyno (Dyno Dynamics) was because we felt it was the best option available to tune cars with. We feel our dyno is the best way to simulate a car driving on the pavement, thus makes the most sense for us to tune with. Sure our dyno reads lower numbers than others, but this has been a non issue. 500whp on our dyno is going to slaughter a 500whp car on a dynojet given it's the same car. As far as which dyno is the most realistic... what do you consider realistic? That is really a matter of opinion if you ask me. The quote "theDreamer" posted is a perfect example. What really matter is the real world results of before and after testing. Each dyno is accurate to it's own settings given that the output has not been tampered with. I don't believe one dyno is more accurate than another, they just read differently.

I don't believe manufacture's mean to deceive anyone with their hp number claims, although most dynos from a manufacture are going to read on the higher end as they are made to reflect their products in the best way. The best way to get an accurate idea of how much power a product makes is to find an unbiased test of the product from a shop that can give you a before and after reading. Take the % gained from the product, not the overall power gained. Just my 2 cents.

To add to the above, there are so many factors that go into a dyno reading, inlet temps, humidity, altitude, etc. To do a completely accurate test the conditions have to be identical. Any differences in conditions can alter the outcome of an accurate reading. The best way we can do it is to get as close as possible. It doesn't make sense to wait until conditions are identical; this would take forever. You just have to take into consideration how the conditions are altering the reading. For instance if you dyno here at 300whp in 60 degree weather in the spring and then add an intake over the summer and dyno here again and make 295 in 105 degree weather, does this mean you lost 5whp by adding an intake? Don't get too caught up in the numbers game, it will drive you crazy.

Great Post Ryan.

Excellent two posts Ryan, and dead on, but can we get some of that 60 degree weather here for Texas? :)

Dynos are meant to be tuning tools, not have all be all final word on power output.

And for gods sake, its "ours."