Dyno Jet/Mustang Dyno

[HotRoddin]

Originally Posted by Jeff Chambers

This 'he said, she said' can go on and on forever but no one will ever be declared the victor.

First of all, let me say I think it's pretty cool you went to that much trouble to try and explain this to me. That being said, let me also say as a direct result of your post, I had to renew my Riddlin Rx to be able to concentrate even close to enough to understand what you were saying

Honestly Jeff I'm not trying to be the victor, I was just trying to figure out how there could be such a large variance from machine to machine on a measuring instrument.

but take two different meters attached to the same voltage source, display them to more than one significant value and see what you get

Thats part of my point ... a decent volt meter, should be within .025% on a full scale reading. Most measuring instruments are pretty precise and very repeatable, and it makes no difference if you go from a Hewlett Packard meter to a Fluke meter, if you put a 10 volt standard across them they better read damn close to the same. Now if the voltage you're measuring is flying all over the place then thats different, and thats my base question I guess ?? When you see these large variances from one brand dyno to another brand dyno, is it the engine or is it the dyno ???
If you had an electric motor that put out exactally 100 HP + or - .1 HP (this is theoretical), and you put that motor on a Mustang Dyno, then put it on some other brand of dyno how far off is acceptable ??

Originally Posted by Jimberg

Unless the weight of the drums were exactly the same between the DynoJet and the Mustang, I wouldn't try to compare the numbers between the two because the load on the engines would be different and would yield different results.

It doesn't matter what size the drum is, or what pickup they use, or how they make their calculations. All that had better be factored in, because 1 HP is 1 HP, you can either measure it or you can't, and i'm not talking about tolerance, I understand there is some degree of tolerance, but you can't say, well that 1 HP is actually 2 HP on my dyno because my drums bigger ??? Noooo lol that 1 HP input is still 1 HP .. if your dyno is reading it at 2 HP, then your dyno is screwed up. I'm not talking about your dyno personally Jimberg lol just a theoretical dyno.

I just have to believe all this variance is in the car not the measuring instrument.

Whew ... out of Riddlin again gotta go !! Seriously, thanks for spending so much time trying to explain this to me, you guys are the greatest !!!

Rod