Ford Focus Forum banner

Dyno chart smoothing? Does it make a difference? See for yourself...

18539 Views 66 Replies 27 Participants Last post by  sjsche
10
I read comments on here once in a while about how FocusSport likes to use a lot of smoothing on their dyno charts. Or how there is a big difference in smoothing from 3 to 5. Or from 1 to 5. Or from...you get the idea.

So why don't we just take a look for ourselves?

First example - Paul Haskew's 2.3 Turbo Duratec

Smoothing set at 1 - The LOWEST setting on dynojet software



Smoothing set at 2



Smothing set at 3



Smoothing set at 4



Smoothing set at 5 - The HIGHEST setting on dynojet software





Second example - FocusSport 2.3 Duratec project car

Smoothing set at 1 - The LOWEST setting on dynojet software



Smoothing set at 2



Smoothing set at 3



Smoothing set at 4



Smoothing set at 5 - The HIGHEST setting on dynojet software




Horsepower and Torque can change slightly with the different settings, but its not anything major. A dyno chart from a well sorted car with a good hardware and software package will look good at any setting. A chart from a car with a not so well sorted hardware and software package will look like it needs help at any setting.

So there it is, laid out flat for you to see. Now you can see for yourself how much of a difference each setting makes.
See less See more
1 - 6 of 67 Posts
Can you think of anything that might increase the jagged-ness of a dyno curve that would NOT be due to some shortcomming of the engine or tune?
I actually appreciate the thread as it is because I'm learning a bit about these dynograph things and what affects them. It certainly sounds like FS has all the bases covered with proof in the puddin'.

I know darn well why FS posted this thread in the first place, so F2's comments aren't really that off topic. If F2 can SHOW us how a dynograph can be manipulated the way they're suggesting then I'd love to see what ever puddin' they're willing to stick out there.

If FS is manipulating their dynographs we deserve to know. If F2 is just using a different type of facility or perhaps something in the tunes of a product they sell is lacking... we deserve to know that also.

If you're legit... put it out there and let the cards fall. :)
Yea, I gotta agree that we should just let this die. It is what it is, and at this point it doesn't matter what else gets said, none of our minds are going to be changed one way or the other about what just happened here. Lets have some class and flame someone in a [PJ] thread instead. ;)
My understanding is that J&S is a secondary, or in his case, terciary electronic control mechanism specifically designed to prevent premature detonation. It's usually used with FI to prevent blowing your engine.
It sounds like you're thinking that because the dyno pull from 1k to 7k takes longer that the valves will be open longer. However, because the valves are directly tied to RPM, the valves will not be open any longer at any given RPM regardless of how long the engine stays at that RPM. The only way to change how the valves open & close is by changing the cams & cam timing.

That said... you could ask the question of how load effects efficiency because (if I understood FS correctly) the spark advance changes with load.
With a good tune it is precautionary. With a tune you don't trust it is necessary. I think what FS dislikes about it in this case is that it is being used wholely instead of a tune, which really does seem kindof a bastardized way of things. Certainly not optimal.
1 - 6 of 67 Posts
Top