alpenweissisnice

Howdy...I've made some mods to my car and recently did some pulls on a Mustang dyno. I read on another thread here that the Mustang reads about 13% lower than a DynoJet. Can someone here verify that? thanks!

Ski

That's what I've been told by the shop that I use (Mustang) and a couple of tuners. This is supposedly based on the different software used, Mustang being a load bearing software compared the dyno-jet as being acceleromter based software. I don't know 100% for sure.
However, that said, I think it was David Salama(??) that did a test on his car previously on a dyno jet, then went to a Mustang later and his figures were down 13%.

I would like to do a couple of pulls on a dyno-jet to make sure but the closest one to me is 2 hrs away. The Mustang one is 45 minutes. My Mustang numbers are 282/291,,hp/torque.

Dave951M

I've spoken with a couple of folks about this, one of them an owner of a Dynojet and each has told me the same thing.

Sean Hall

Dynojet's methodology is least prone to inconsistencies and error since it determines HP based on the rate of acceleration of a fixed mass(the wheel drum). Other systems measure load from sensors, then calculates HP. Sensors change over time and are only accurate to a certain degree.
Therefore, Dynojet is the most accurate.

FYI, software doesn't really have anything to do with it. Software is just running the calculations.

Sean

Ski

Sean, thought it was the actual software on the parameters,,oh well, thanks for clearing that up.

wjk_glynn

Here's an article comparing various dynos: http://www.turbomagazine.com/tech/03...ash/index.html

Karl.

alpenweissisnice

I asked the question because with my present set up I am getting about 202 hp and 224 tq on both a Mustang and a(n Australian) Dyno-Dynamics dyno. According to my chip maker, with a test pipe car like mine he usually see's 225-230 hp and around 250-260 tq on a DynoJet pull. When correcting my Mustang numbers to (estimated) DynoJet numbers, it puts me right where I should be. Thanks! B

Jake951

Go to http://www.dynoperformance.com where you'll find quite a bit of discussion on dyno results and comparisons of different dyno's. The consensus there also seems to be that the Mustang gives results that are 10%-15% lower than the Dynojet.

alpenweissisnice

Great site, Jake951 - thanks! B