Adjusting for Ford injectors?

[efnfast]

Using the OEM LS3 fuel injectors (I think that's 43lbs @ 58psi) my tune is using this pressure vs flow rate table (fuel pressure is not vacuum referenced)


My intake manifold requires long Ford injectors, so I'm using 50lb (550c) DeatschWerk injectors that flow 64lb @ 58psi
http://www.deatschwerks.com/products...-0050-8-detail

They provide all sorts of tuning data
http://www.deatschwerks.com/images/s...l%2018u-50.pdf
http://www.deatschwerks.com/images/s...n/18u-50lb.pdf

But i don't have a clue WTF to do. Does anybody know how to change the pressure vs flow rate table for these injectors (and would i have to make other changes also like with pulse width??)

Alternatively, if I purchased a set of 42lb ford injectors and just lowered my fuel pressure to 43psi would that provide results similar to using the OEM ls3 injectors at 58psi, or would other parts of my tune be off?
http://www.deatschwerks.com/products...-0042-8-detail

[Jabbott]

I do it the hard way or so it may seem. If you make a excel spread sheet just like above but next to the 408 put in 400 also. The 400 represents 4 bar or 58 psi. Now if you put in your 64lbs and you then solve for the difference of pressure from 400 to 408, that formula can be copy and pasted everywhere else and will populate the table. your formula would square root of have over want. So 400 would remain since you know your injector is 64 lbs so it would be 400/408, then 400/428 see the pattern. You only need on formula, excel will do the rest for you.

[Jabbott]

64lb injector.xlsx

[Jabbott]

Wow that came out real small.
send me your email and I will email you the spreadsheet

[mowton]

You can try this one I generated....You input the injectors rated flow at your FP and the FP and it calculates the IFR in both the formats. I set it up for EFI Live so you will have to copy/paste special.values>transpose to get it into HP Tuners format...sorry

Ed M

[Jabbott]

oh I see it. I was using the quick reply and it doesn't allow attachments.