even the same day temp though the dyno rooms can probably make enough difference to alter the power also. then factor in your fans and stuff.. i guess there really isn't a 100% legit way of comparing 2 dynos unless you clone the room and have them side by side.

 

maybe in our next shop ill tune on our mustang then roll forward on to a DJ LOL LOL!

you are correct-

People have questioned our dyno numbers in the past but- they dont consider our dyno setup-

1 big high volume fan- 2 high velocity fans, and a 22,000 CFM extraction unit- thats divided from the rest of the room- which creates a wind tunnel style effect---

that obviously helps in effiency over pointing the exhaust out the door etc-

cb

 

Nope not referring to him.. By 17% I was referring to a freind of mine that did the comparison this year. The graphs are somewhere in the tuning results section.

 

Building test cells is very expensive, I have built 2 here at work and currently on number 3. We have our own combustion air handling units, climate controlled test cells, exhaust sampling tunnels for diluted or raw sampling, large AC motor chassis and engine dyno's ect., you can easily drop half a million on a chassis dyno test cell and still not be complete lol..
I always liked the rule that if you can talk to another person in the test cell while the fans are on, then they are not big enough..
http://www.youtube.com/watch?v=eCZDodUAn8Y

 

Doesn't AMS have two dynos? A Dynojet and a Mustang dyno in adjacent rooms?

 

just had mine tuned on the AMS mustang dyno and they told me that it reads 7.5 - 8% less than their dynojet in the adjacent room.

 

I've tuned at your shop, your Time Attack car. There is still exhaust in the building with your set up and it contaminates the air. Positioning the car so the exhaust HAS to exit the building is the best way to keep the air clean inside the building.

 

david-

since you have been here- there is massive division in the room that wasnt there before-

now there is a full height wall and industrial shop curtain-

so much that- with the Air conditioning on in the shop- the temperature doesnt go up more than 2 degrees on a 95 degree day

you were here 2 years ago-

ill post some pics-

cb

 

good stuff again Petey-

Thats one of the issues when a client tries to talk to us from 15 feet away and we cant hear them-

cb

 

We have the big MD1100 dyno and is around 13% lower.

 

I don't know why on a typical car you'd need that type of airflow for a dyno. Maybe I'm a bit confused based on moving our dyno three times and each time getting it closer to the door and now in a building that basically is an "outdoor" situation. I guess if you had a room that was well inside a building and needed to evacuate the air or had some crazy air inlets like on Indy cars where the car can get packed into an engine at 200+ mph it would make sense. For a "normal" car, clean air is about all that is needed.

We have two high speed/volume fans on our dyno. I think last time I was called out on our fans I made some Youtube video with a wind speed meter and our fans put out like 45'ish mph winds. It's enough that the air intake temps stay stable and low. The only cars I see that change from the dyno to the street is a well set up front facing turbo set up, we can't simulate 150+ mph air getting packed into the turbo on the dyno and the cars run a little bit leaner on the track in those conditions.

 

David-

for us- as you saw- our dyno is inside our main building- so extracting the exhaust and moving air is vital for the overall functionality-

Now its mainly divided- which works great-

also- for cars with dump tubes- etc- the overall airflow helps to move the exhaust from the rooms-

maybe Ill start a "dyno discussion thread" as this thread is mainly intended to be about the DJ/MD comparison- and I think we've both had to deal with that controversy time and time again-

CB

 

Also regarding the fan stuff. You can use an output from the MD computer to send a signal to a VFD to supply variable power to a fan, and when calibrated properly, will simulate on-road conditions up to the capacity of the fan to match with vehicle speed. We have this set up with our new Mustang advanced engineering dyno which is a chassis dyno that uses an AC motor instead of a PAU to apply load. The other benefit is that the dyno can actually motor the rollers to simulate downgrades ect. for different test cycles we run..

 

Petey-

thats pretty interesting-

I may have to come check that out- good insight-

cb

 

David, is this your actual fans configuration?

http://www.youtube.com/watch?v=bjnuv..._order&list=UL

These are two high speed but very low volume fans in my opinion. How much are them rated?