JakeFusion

iTrader: (7)

I know people have run the 42lbs Blue Giants (04 Terminator injectors) with the same spray pattern as the 47lbs GT500 injectors. But they are a dual spray pattern that will not have optimal flow for a single LS1 intake port vs the DOHC twin intakes of the Ford motors. I'm guessing it will lead to some wonky behavior and part of my goal of switching injectors is getting good data so I can eliminate multiple variables associated with fueling.

I have the injector data from Ford and have converted it to GM's data using Dave Steck's spreadsheet... but I don't have a clue as to what would need to be done with the transient fueling and the fuel to wall and fuel on wall calculations due to the spray pattern being non-optimal.

Does anybody have any suggestions/guidance?

eaglegoat

Dial in your steady state airflow tables first. Then when you're confident those numbers are correct move onto dialing in transients.

JakeFusion

iTrader: (7)

For my current injectors? Or if I swap out?

kinglt-1

iTrader: (26)

why not run stock LS3 injectors? I am sure your potentially making good power but I do not see why you need more then a 42? I also would think the GTP injectors would be fine.

JakeFusion

iTrader: (7)

That's what I'm thinking of doing. I just am being cheap for once on the build. I could always grab them used vs new.

Also looking at some used L59 FLEX fuel injectors, which are 38lbs @ 4-bar (I forgot the FF are only commanding 50PSI vs our 58)... so they would be good for heads/cam and they are the LS2 style injector, and I have all the data from an 05 Avalanche tune... Basically, they are LS3 in the right length for my FAST LSX manifold and LS2 rail.

JakeFusion

iTrader: (7)

Just an update,

I spent some time today looking at the various Flex Fuel injectors. The 2009-2014 6.2L L92 Flex Fuel injector (PN 12609749) is a 42lbs injector @ 3-bar and 50lbs @ 4-bar. It's a reasonably priced injector even when purchased new. It is the 34mm, LS3 sized injector, so I bought the LS3 to LS2 top mounted spacers from FIC to go with it.

I found the tuning data on EFILive's forum - joecar took the data from a 2009 Escalade L9H Flex Fuel tune and converted to LS1. The injectors were OE equipment for the 6.2L L9H engine.

These are basically bigger versions of the LS3 (same fitment) with GM data on them and are much cheaper new. So they are a good option.

Should have everything mid-week. I'll log with the wideband and see how everything looks.

JakeFusion

iTrader: (7)

I never updated this. The injectors worked flawlessly.

The issue is they are not flow-matched and I can see a 10% difference bank-to-bank when logging.

I've considered going back to the GT500 injectors to try since I bought them flow-matched. They idled fine and performed okay, so maybe the fuel pattern spray is less of a problem. Having injectors spray wildly different amounts of fuel is worse...

statesman

I'd say you should definitely switch to the flow-matched injectors. 10% is too much difference bank to bank.

JakeFusion

iTrader: (7)

The injector data from Ford is screwy on these. When I convert the Ford data using Banish's method I end up with an offset table that's negative in the 70-80 kPa range.

statesman

Send me a PM.

mOtOrHeAd MiKe

iTrader: (8)

These two things can be really helpful, you will need your specific injector datasheet.

http://www.hptuners.com/forum/showth...on-spreadsheet

JakeFusion

iTrader: (7)

Yeah... and it comes out negative in a lot of places. I talked to Dave Steck about it and he said the injector data has an error on that one but Ford doesn't care. Close enough.

turbolx

Say what? I never published a "method" of converting the data. I just included converted data as part of my GM Tuning Beginner's Guide DVD.

Looking at the data disc file, I only see one area in the 47# injector tab offset table near 4.0 and 5.0 volts where it defaulted to negative numbers because of the limited info from FRPP. Everything from 7.0v and up checks out OK. Are you planning to intentionally operate at that low of battery/system voltage? Because that's the only way it would change how your engine runs, even with the flawed data.

JakeFusion

iTrader: (7)

No. That's why I thought it would be okay.

These injectors actually worked well for me. I may swap back to them. They are a little big for what I need (thought I was going to a nitrous 416 where they would have been good).

And I meant to say I took the Ford data and used Steck's method for converting, which I thought he got from you.

scottydc

Have you had any luck with the gt500 injectors? I have a set I want to install but I see what you mean about the negative tables when using Stecks spreadsheet. Did you just input the info anyway and run them? The specs I converted show negs in the 70-80kpa as well.

JakeFusion

iTrader: (7)

No. I was going to swap over. The car ran pretty damn good with them using FIC's data, but that data was pretty far off from the Ford/Steck data. Of course, my VE table looked like ****.

scottydc

The data appears to be off in the FNPW_OFFCOMP section @ 30.02 and 60.03. Do you happen to still have the FIC data? Or how do I go about finding it?

JakeFusion

iTrader: (7)

FIC data is way off.

As Greg mentioned, unless you plan to actually operate the injectors there, it's a moot point.