Calculators

[Calan]

Hmmmm... wondering if it has to do with the form names all being the same. I'll do some checking.

Could be, although you are using unique var names in the JS functions that match up correctly to the HTML input elements. I would think that it would still work unless you were somehow trying to call two functions at once, but who knows. Can't say as I've ever tried it to find out.

 

[snowborder714]

Ok, I figured out the issues. Chris, I have an e-mail drafted up for you, but need to get the new version of LinkTools from Craig so I can fix the E85 calcs.

Craig, can you send me the newest version please?

 

[Calan]

On it's way

 

[gofer]

Got a new calculator to add. Its an equation to use when you want to lower your IDC's by increasing your base fuel pressure, assuming you've got enough pump to support it.

We'll use my car as an example. I was seeing IDC's of 105% with a base fuel pressure of 43.5psi on my 950cc injectors. You've got to decide what you want to drop your IDC's down to, for this example we'll say 90% IDC is where we wanted it. So, using this equation you know what you need to bump fuel pressure to so you can lower your IDC's to safe levels.

current base fuel pressure x (% of current IDC's / % you want your IDC's)^2 = new base fuel pressure​

Using my example above this is what it would look like...

43.5 x (1.05 / .9)^2 = 59.2psi​

Credit Dave over at ECMLink for my math lesson this a.m. I also wanted to mention that I can't get any of the calculators that are in there to work.

 

[snowborder714]

The page is currently broken. I'm working (hopefully with Craig) to redo the E85 Global and Fuel Mix calculators to combine them. I'm not doing so well with the math today either

I figured out the issue as to why the current page isn't working, but figure I won't send Chris an update until I combine those calcs.


Do you think this would be good to integrate into the current fuel pressure calc, or make it it's own?

 

[Ravenous]

Thy don't seem to work in Google Chrome. Just thought you'd like to know.

 

[snowborder714]

I'll have to put Chrome (and maybe Safari) on my computer to do some testing once I get them to a known working version in IE/Firefox. Any other browsers that I should consider? (I don't know if Chris did any browser testing, but I did IE/Firefox).

 

[gofer]

Do you think this would be good to integrate into the current fuel pressure calc, or make it it's own?

I think it would be better used on its own.

I know there are all kinds of tools for tuning SD now but you may consider including the VE change calculator based on AFREst. and WBAFR's too. I still find myself using the equation to make quick changes street tuning when I don't have time to upload everything into LinkTools.

New VE = VE cell being used (AFR displayed on WB / AFR cell being used in your DA table)​

I know you're trying to host them on a web browser for the site but is there plans to make them available to use in Excel? It seems that when I've needed these calculators the most I'm street tuning and don't have access to the internet, having them available to download would be great!

 

[Calan]

I know you're trying to host them on a web browser for the site but is there plans to make them available to use in Excel?

Most of them are in LinkTools...and I think the calc tab may work ok on newer versions of Excel since it's mostly just formulas. Feel free to check that for me if you get bored Corey.

 

[snowborder714]

You should also be able to create a local bookmark/copy of the website for offline use, I would think.

But yes, a lot of these came from LinkTools

 

[Calan]

I'm liking that pressure > IDC calculator B.

What if you added a second function to it that would send up a red flag if the resulting base pressure was beyond the pump? I'm thinking you could select the pump type from a drop-down of common pumps, and enter max boost. The program could then look up the crack pressure of the pump's HPRV and set off fireworks to warn the user if needed.

BTW - I got your email, and will try to take a look at it this evening after I do the late V-day dinner thing.

 

[snowborder714]

That would be possible. I'd just need the data for each of the pumps. Is this info something readily available from each manufacturer? Or maybe do you have this info somewhere?

 

[Calan]

It should be available; I know I've seen it somewhere for the Walbros, but I'll have to dig it up. If we can't find published data, there should be lots of real-world experience as to when the relief valve usually lets go. (For example, the "punched" 255's vs. the stock ones, etc.)

We need to get the information wiz kid on it (The other B - 19Eclipse90)

EDIT:

The PRV in my Deatschwerks DW300 pump cracks at 100psi, per this datasheet.

I'm sure other pump manufacturers will have something similar.

EDIT #2:

After thinking about this some more, we (you ) should probably also calculate and consider the flow rate...since it drops off in a non-linear fashion as pressure rises, and there is always that trade-off between pressure and volume. A good example is the standard 255, which I believe has a PRV that is set to something like 90psi or a little higher...but usable flow (for low power setups) is probably limited to something more like 80-85psi.

And if you REALLY want to be cool, you could also factor in the voltage at the pump, since that is also a determining factor in when you run out of pump volume. I know for a fact that I'm at the limit well before I hit the listed 100psi PRV of my DW pump, especially at less than ideal voltage.

 

[snowborder714]

Finally got around to updating and fixing the issues. The only thing that is not fully updated is Chris putting the pie cut image on the server.

Please look through it, test it, let me know your feedback!!