Ok, I hooked up a fuel pressure gauge tonight and tested the fuel pressure. PERFECT, I think.

At idle, with the vacuum line attached, it's right at 40 psi. With the line off, it's between 45 and 50 psi.

At WOT, it goes up to like 50 and stays steady. Well, it did from like 20-80MPH and from 60-100MPH... So the fuel pressure appears to be ok.

I noticed after reloading the stock fueling flash back to the car, it ran a little lean at WOT in a few spots. I was getting 750-ish at times on the o2 readings.

Tonight, while checking the fuel pressure, I had Jeanna watching the o2 readings... Now it's been almost a week since I loaded a flash to the car. The o2 readings were 900-930... With ZERO changes to the tune....

So I had her tell me what the LTrims were the next time I went WOT... They were + 20.3% on both sides!

I don't understand that...

I thought the car didn't learn BLMs at WOT.. So why would the car add so much fuel at WOT?

This seems to present a unique tuning problem. It appears that I will have to lock the BLMs to 128 at WOT, then do the tuning from there. Am I correct here?

And don't most cars need fuel removed to get peak power at WOT? So I wonder why my car needs so much more fuel that most???

 

The operation at WOT depends on the status of your BLM's before going into WOT. If you had BLM's greater than 128, meaning the PCM adding fuel to compensate for a lean condition, it will automatically go to the richest possible when flooring it.
You must observe the BLM's in all the control cells and adjust in order to keep them below 128. You can achieve this by several means: Fuel pressure, Injector constant or MAF table calibration.
Another approach is just to have your BLM's locked to 128 for WOT.

 

Forgot to mention the split BLM's at Idle. That is another game. You adjust these with the stop screw on your TB. You should look into that one too.

 

Now I understand. If the PCM was adding any fuel whatsoever to the car before going to WOT, it will add the MAX allowed while at WOT...

Ok.

Next question:

I don't have an AFPR, so I can't adjust the fuel pressure.

If the PCM is pulling fuel at idle, but adding it at anything above idle, I should lower the injector constant, correct?

Or should I increase the MAF table to cause the PCM to add more fuel? My MAF sensor is completely stock, it has NOT been ported, it still has the screen, as it came from the factory.

 

You could do that or you could also modify your maf calibration table so tha the PCM "sees" more air being drawn at this particular point.
I have only played with the maf calibration table because I have a descreened MAF sensor with billet ported ends. It worked allright for me. I was able to get the BLM's of all the control cells in the 0 -5% region.
You can do it either way.
The downside to changing the injector constant is that you will alter fuel delivery all across the spectrum.

 

just to help you out the afpr does nothing on these cars. the pcm will see the decrese or increase in pressure and adjust the pulse width on the injectors. so thats out. if you work in the maf tables besure you make a smooth transition on the tables don t go from 22.xx to 30.xx and the next one be 32, 34 and so on if you do it will have a bad stumble.

heres another hint you can not tune for wot throtle by looking at your o2s readings. they are only good for one reading and that is 14.7 and if they dont see 14.7 the pcm makes the changes. if it gets to 14.6 or 14.8 it will spike the o2s reading one way or the other becuase it wants to see 14.7.

now heres how the pcms works during all this. when you go wideopen throtle the pcm goes into pe mode (power enrichment mode. not wide open thrtole as some say. now if the blms are below 128 (as said above) when you go into pe mode it will use cell 18 for the wot cell and thus will not add fuel. and you will see your lt blms locked at 128. if you are seeing a lt blm above 128 it will use cell 15 for the pe mode and the last stored correction factor in that cell is added to the fuel that is stated in the pe mode that the pcm is programed to hit without a added correction. oh and your o2s will be showing a bunch of crap but none of it it use in pe mode when you go wot. thus they are no good to you at wot. thus the invention of the wideband o2. so you need to get the blms right before you start on the wot stuff.

but acctually you are ok if you see any blms between 108 and 160 that means you are not running lean or rich but if the computer wasnt correcting it for you would be. but if your concern is wanting to do alot of wot driving then yes you need all your blms below 128 to keep from using the added fuel correction in cell 15. i like all my blms about 125 126 area that way i know its bleow 128 and its going to hit cell 18.

good luck. need any help give me a yell.

do you have a bin file or lt1edit file of you current program. i would like to see it.