Ok, this is what I know thus far:

My engine is going to need much more fuel than my system will create right now. To counter this, I need injectors that are larger and/or more fuel pressure. I will need to calculate by what scale I have increased the amount of available fuel and set my BPW constant from this number. There are several calulators available for this. To use the stock injectors I'm going to need somewhere around 21-23 psi fuel pressure (to turn the 61 lb/hr units into 100 lb/hr units so to speak). Accordingly, I will reset the BPW constant by the same proportion.

After this, I run the engine and log data. I will watch knock counts and BLM to get a general idea of where my fueling is at any given rpm/engine load. Knowing this, I will edit my VE tables. Looking at the .bin, there are two of them. From what I understand, FL1 edits the entire fuel trim across the board. What does FL2 edit?

This is all I have learned thus far this week from reading everything that I can get my hands on about tuning. Is this a good start? Once I get the VE tables where I need them, what should I concentrate on next? Spark timing?

All I can say is that this is an awful lot of stuff to swallow at once, but I will figure it out. My engine shoud be installed and running in two weeks and I want to be set up so that I can edit the programming as soon as I can get it running. I intend to use TunerPro RT and the PROMinator. If anyone has any suggestions otherwise, I'll consider them before Monday, otherwise, I'm going to order the PROMinator and be done with it.

I very much appreciate the help of this board helping a total newbie understand this. I'm heart-set on making this engine run as well as possible with the TBI and I want to learn everything I can because I have limited time to work on it. I need to learn all the info I can learn here because my truck lives 100 miles away for the time being.

It seems that once I get the rough part of editing done, and using WIN ALDL, I should be able to get near the full potential. If the last 10% takes me the next 6 months or something, that's fine, as long as I can get it to where my truck can be driveable soon, and work from there. I can take it out on some four wheeling trips and do some real world data logging once I get the rough chip burning portion done, and then edit from there.

 

Tuning your first chip can be a long drawn out process, espicially if you haven't been exposed to the processes before...BTDT! But after you do you first few burns and learn how the changes you make affect the motor, you will gain confidence in what you are doing. I'm still trying to get my VE tables to the point where I want them before moving on to the spark tables. It's taken me 28 burns (and a LOT more datalogs) so far to get my BLMs between 112 and 136 in most all throttle settings except for PE mode. Since I've leaned things out quite a bit from where I started, I'm now getting a little stumble if I just crack the throttle, so I've got to learn about the AE before I can move on to timing.

I haven't had much time to play in the last couple of months, but as soon as I do, I'm sure I'll be posting a buncha questions.

 

My biggest concern is getting a baseline to work from. I can monitor my BLMs and make changes here and there, but I need to know where to start.

Right now I'm pretty undecided about everything. Some say use stock injectors and crank the fuel pressure way up. Some say use larger stock units. Still others say to use Holley's.

 

I'm running a Holley 670cfm TBI and the Delphi injectors run a LOT richer than stock. The aggrevating part about trying to calculate the BPW is that the injector flow will vary considerbly depending on fuel pressure. I started with a stock bin and started leaning things out to the point where I am now; so that would be my slightly enlightened advice. I'm sure that one of the gurus will show up soon with some better advice.

 

I'm thinking as of now, so I don't have to buy injectors, I'll start the engine and break it in with the stock fuel pump and a bit more fuel pressure to keep it from going lean.

After that I am seriously considering using the same injectors with significantly more fuel pressure.

What I'm trying to understand is...if I up the fuel pressure significantly (say to 23 psi) and use the mathamatical calculation to figure out my increase in fueling, and proportionally reduce the BPW constant, will it run the same as it did at the previous fuel pressure?

As long as it will, I will feel comfortable jumping up in fuel pressure. At that point I can lean out the idle and start to enrichen the higher load/rpms in the map to feed this monster.

The only thing I need to know is how to modify the .bin to make sure it's safe to run at the raised fuel pressure. I don't want to drown my new motor in fuel.

Stock injectors are 61 lb/hr. Assuming that is at 11 PSI, if I up the fuel pressure to 23 PSI they become 88 lb/hr units. 61/88 = .693 * The stock BPW which is 135 = 93. So, my main question is, if I go to 23 PSI of fuel pressure and change the BPW to 93, will it run the same as it did at 11 PSI? Is that how I get my baseline with the increased fuel pressure and tune the VE from there?

 

In theory, it should. But (dontcha hate that word) it may or may not be where you want it, there are a lot of variables that play into the equation too. One thing you can do with the stock bin to richen it up for your break in would be to up the BPW slightly and/or raise the VE tables about 10%, then watch your 02 and knock sensors...like a hawk for signs of a lean condition. Another possibility would be to slap a carb on it for the break in.

 

I'm going to raise the fuel pressure for the break-in to the max the pump will give me. At idle with no load, I'm not worried about going lean or detonation. There will be no on-road break in as this truck is literally off road use only.

Can someone explain the difference between the FL1 and FL2 fuel tables for me please?

 

Have you looked at the stickies yet?
There's plenty of info on that in the 747 tuning section.
You might want to check them out before you start asking the simple questions.....

 

This stuff seems simple to you, but I have searched and read everything on this board. In fact, I've spent at least 30 hours in the last week reading everything I could get my hands on. It has taken me nearly a week to learn some of the acronyms that are thrown out here like it's nothing. I'm not asking to be babied, but I do need some clarification here and there. This stuff isn't as cut and dry to me as it is to you or anyone else.

I just spent about 90 minutes on the phone with another forum member and he was very helpful, filled in all the little gaps where the FAQs and stickies are missing. I have ordered RBob's EBL, a ZIF socket from Moates, chips, and a chip programmer.

I will be firing my engine two weeks from tomorrow if my stuff goes as planned. Should be plumbing my fuel system with a TPI fuel pump this Tuesday and finishing up the installation of my harnesses.

This is very nerve wrecking, but after talking to Jim (Liquidh8) I'm 100% confident that I will have my truck running better than it ever has very soon.

 

maybe someone can chime in here.

i think it may be a good idea to add an adjustible fuel pressure regulator. Aeromotive makes a fine unit for TBI. that is the first few minutes the car is running you can make adjustments globally to A/F by FP without having to change the .bin. since you will be changing oil any waythe FP can be set a bit on the rich side with a simple quick adjustment. listen to idle quality and smell of gas to get it reasonable. after initial break in and car is rolling down street the datalog will show youi if you are globally rich and then you can back off on the FP and reach a final BPW in .bin to carry on your tuning.

 

I already have an adjustable fuel pressure regulator on the way from Turbo City. I'm ready to rock and roll.

I'm going to set my fuel pressure somewhere between 26 and 30 PSI, set my BPW constant and fire the new engine. I'll let RBob's EBL show me how to go from there.

 

https://www.thirdgen.org/forums/diy-prom/221769-fuel-tables-target-afr.html
This is the second link in the 747 section of the tuning guide.
The second post answers your question on the tables.
Was the difference in the name FL & Ve throwing you?