Injector data populated by EA

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Injector data populated by EA

Unread postby 89FiveOh » Mon Mar 19, 2018 10:00 am

Hello,
When running datalogs thru EECAnalyzer, some of the injector values in the higher rpms turn red when calculating injector timing. I think this means I cant get the pulsewidth to happen within the time needed before the valve closes. Can increased fuel pressure aid in the making the injector bigger so to speak? Will increased fuel pressure make up for the undersized injector in this rpm range?

thanks
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Re: Injector data populated by EA

Unread postby decipha » Mon Mar 19, 2018 11:10 am

yes, you basically gain a 1% increase in flow per each psi of fuel pressure over rated

so if you have 19 lb/hr injectors rated at 40psi, if you kick it up to 80psi you gain 40% more flow

19 * 1.4 == 26.6 lbs/hr @ 80psi base fuel pressure
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Re: Injector data populated by EA

Unread postby 89FiveOh » Mon Mar 19, 2018 6:39 pm

So, to get a 30lb’er with 24’s, I need approximately 25% more. I could add 25 more pounds to the stock 39.5psi for a total of around 65 psi?

Does this require messing with the tune again or will adaptives curve back in any fueling changes?
89FiveOh
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Posts: 41
Joined: Thu Jan 11, 2018 5:13 pm
Name: Andy Borden
Vehicle Information: 1989 Mustang GT
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MOATES QuarterHorse
308
Custom Cam (HR)
AFR 165, 58cc
BBK 75mm (24lb/hr calibration) MAF
5 speed
3.73 gears
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Full length BBK headers with H-pipe thru Flowmaster mufflers

Re: Injector data populated by EA

Unread postby SlowBox » Mon Mar 19, 2018 7:25 pm

I made an adx payload to calculate intake valve duration and display a percentage of the valve event vs the injector pulse. Based on what I've seen with my own car, you'd need to stay under 40% duty cycle ish at max rpm at wot to fit the entire injector pulse into the chamber for each cycle. Honestly, beginning and ending the pulse during the intake stroke and fitting all the fuel into the chamber before the valve closes isn't really important at all at high load where there's tons of velocity in the runner. What doesn't make it will be there the next time the valve opens, and it'll fix itself each time.

I ended up doing several hours worth of research looking at valve event duration at different rpm, excel spreadsheets, cam cards, injector duty cycles and pulsewidth, etc and got my injector timing table dialed in really nicely. Start a new thread if you want and I'll post up what I've learned.
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Re: Injector data populated by EA

Unread postby decipha » Tue Mar 20, 2018 12:58 am

correct your math is sound

24 * 1.25 == 30lbs/hr at 65psi base

no, you cannot go from 24 lb injectors to 30 lbs injectors without redialing in the injectors.

if you do decide to raise the fuel pressure to 65psi, id recommend kicking up the offset 20% and raising the low slope and high slope as well as breakpoint 25% for starters

then adjust to get your fueling back where it was
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91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
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