Pulling time on WOT but wideband shows neither too rich or lean

[toonwarrior]

Okay so been a while since the last update.

I got the car running pretty well with these injectors and honestly it ran pretty strong.

Long story short however, I wanted to see how someone more in the tuning bizz would do it better, so I reached out to a remote tuner who does these engines pretty much daily. With that came with having to swap to 33lb FIC injectors so they were confident they weren't tuning with faulty injectors since these one's are quite cheap. they provided me the base file but essentially every log that I provide it takes a few days for them to respond. Problem is I don't got much time before I have some events that I need to reach to. Nothing against them its just time is of the essence. I will still go through the tuning process with them but in the mean time I can hopefully get this to work, otherwise I'll need to swap back to the other injectors for now.


The main problem I'm having is these huge fuel trim spikes, the last time I had them was due to the min fuel mg, however this time when I tried to play around with it, it really didn't do anything, made it feel worse if anything.

I got all the data from FIC directly so I'm not sure if it's incorrect or not. I tried playing around with the transient settings since my initial tune I had it copied from a tune that had a similar shaped intake style but the base tune provided is different so I'm assuming it's correct.

Let me know if it's something obvious


85.hpl
Impala 33lb V5.4.hpt

[toonwarrior]

I should mention this file is setup for MAF (I think?)

[Alvin]

That tune doesn't look great.

The injector data isn't correct. The flow rate is setup for vacuum referenced regulator. The offset is set up for fixed pressure.

VE doesn't look appropriate to me. They will look different than a LS but this just isn't right for LT at all. Shouldn't have the same VE number from 5600-8000.

[toonwarrior]

Yea the VE hasn't been dialed in yet, think they wanted to start with MAF, but can't really do either if the injector data isn't setup properly

So this is the spreadsheet I was provided for the injector data, and the default pw values I was provided by them via email.

330cc(6759).xlsx

How would I adjust this for the lt1 i.e your comment "The flow rate is setup for vacuum referenced regulator. The offset is set up for fixed pressure."

[blindsquirrel]

Copy '0 kPa VAC' column, paste into every column all the way across. For both Flow Rate & Offset tables. The full data with 'sloped' values that change from left to right are for a non-referenced, 'returnless' system.

[toonwarrior]

Hmm gonna have to break it down a little bit more for my not so big brain

my flow rate vs KPA is set to 34 all across (should be 33 but ill fix that)

When we talk about the offset table we are referring to this right, what does it mean by copy '0 kpa vac' and paste it all the way across. I apologize for the lack of research on my end. I've tried comparing files with the one you sent me for the other injectors to figure how it was done for that one but can't deduce it.


0kpavac.PNG

[blindsquirrel]

screenshot.31-07-2024 12.54.43.png

screenshot.31-07-2024 12.57.12.png

[blindsquirrel]

But, the '0 kPa VAC' data is assuming 58 PSI, to get the correct Offset data for some other pressure you'd need to take it from one of the other formats, with the Pressure Delta-style tables, using the Delta column that matches your base rail PSIG... paste in the cells that have the same Voltage labels, then interpolate across the empties to complete the column, then copy that column and paste into the others.

The dirt cheap L96 injectors from that Ebay seller have been used here more than a hundred times, not one person has used those injectors with the converted data and found anything 'off' about them.

[toonwarrior]

Well I'm considering going back to them, I just didn't have enough trust in myself that I was doing things right but maybe I doubted myself a bit too hard

But in the meantime just going to go through with this, if I can't get it into a better state in the next few tune adjustments then putting these back in the box.

And thank you for the help!

[blindsquirrel]

The tuner you're working with, the one who wanted you to use these FIC injectors, was not competent enough to give you a file with the injector data entered correctly for your setup?

[blindsquirrel]

Here is your file with that FIConnection data, converted for 43psi/referenced.

Impala 33lb V5.4 - FIConnection 330cc 43psi referenced.hpt

Maybe forward this to your 'tuner' so he can use it as a reference in the future. Jesus.

[toonwarrior]

Well that's what I was expecting when those injectors were recommended

But once i received the file I knew it wasn't right so here we are

[toonwarrior]

So I loaded in the tune with the updated settings, but the trims were still just fluctuating 20-30% rapidly.

I really didn't have time to deal with it right now so I installed the ebay one's again, updated the tuners base file with the injector settings and I updated the transient fuel settings and the car feels amazing to drive again. Maybe later in the year I'll try again not because I want to run them but just going through the process of figuring out how to get them work half decently is a learning process.


I do have a question on the transient fuel settings. I have it setup to match settings of a vortec based motor which I guess has a more similar intake port design than the LS1 base settings that come from the torqhead tune. I haven't had any issues with the settings but I'm not convinced it's correct.

Problem is every lt1 tune I've looked at either has the base LS1 settings, or something way different, I understand that most of the tunes have modified intakes and heads so not something I can reference as much but if anyone has the right settings for an ironhead LT1 I'd be curious to see what those settings are.

[Alvin]

Don't bother too much with transient. Get the tune 100% ironed out with the basics then you may look at that.

FWIW I've done a ton of 24x swaps. SBC BBC and LT1. Only the BBC's have required any effort at all in the transient stuff. But I'm also a fan of absolutely dialing in VE and all the other basic tables first.

[toonwarrior]

So everything was going fairly well but running into something weird. I replaced my AC lines and got the system recharged and everything works, in the process I replaced one plug wire that I noticed that almost burned through. Also replaced the serpentine belt.


After that, the car at idle regardless of AC on or not has an intermittent eratic idle that pops up. And sometimes to the point the car will shut off. Otherwise it'll fluctuate down to like 300-500 rpm and then bounce back up

Considering this wasn't happening before with the same tune settings I'm assuming it's something physically related but I can't figure out what.

Or maybe it's something in the tune that just began to show itself, not sure where to start with this one.

98.hpl

basetunev2.72.hpt

300rpm.PNG

[SiriusC1024]

Un-zero the throttle cracker lol. Then tune VE. Don't waste time fine tuning idle until that's done.

[toonwarrior]

Thanks I'll do that

[abc]

Sounds like you boogered something up during the AC repairs. What plug wire did you use to replace the presumed faulty one? Was it another used one? Might want to do a cylinder drop test and see how that cylinder is performing. Try the old plug wire again? Would be nice to get it back to where it was before the repairs then dig back into the config. file.

[toonwarrior]

That is a good idea

Brand new wire, same brand also, I do have to modify it to work with the coil pack since it's an LT1 plug wire with an ls1 boot so may have boogered something there.

That being said updating the throttle cracker is helping i haven't seen it dip to what it was doing. I was working with a remote tuner and that was the base file I was using hence why it was zeroed out, not sure why but I've essentially just gone back to doing it myself.

[SiriusC1024]

Yep. Throttle cracker. Now do VE. You'll be happier.