scorp508

I had a few minutes to tinker with the car some more today.

At idle with no changes it was averaging;

BLM Cell 0
BLM 147
Integrator 130-135
MAF gms/sec around 8.6
O2 swinging between 110mv and 860mv
LV8 of 56

With the 147 BLM the LTFT was +14.8%. I then tried changing MAF Table #1's 0.73 volts entry since that was closest to the 8.6 gms/sec the data showed. I changed it from the stock 8.38gms to 9.63gms and the BLM instantly went to 126 and the integrator swinging from 123-130. The tailpipes smelled better and LTFT was somewhere around -1.6%.

I ended up settling on 9.37gms in that cell which had the BLMs swinging between 127-128 and an Integrator of 126-130. It looked like the holy grail, but I felt like I was just cheating the system in a way that made it what I wanted to see since I have no wideband O2 hooked up to the thing. Obviously I need to get out on the road and drive this thing under different loads and see what it does.

I guess I'm curious if I should continue to alter the Injector constant and avoid touching the MAF tables, or leave the injector constant alone and DO start altering the MAF tables.

The IC is currently at 24.02 pounds. I have Ford SVO 24# injectors and the FP at idle w/o vacuum is set to 39psi. At the 750RPM idle the vaccum pulls it down only by about 5-6psi.

Oh I increased the stall saver enable/disable some, but it'll still dies if you tap the throttle enough to raise the engine RPM from idle to >2,000 and let off the pedal.

I've been pouring through old thirdgen.org articles and there seems to be a very polarizing view on whether or not the MAF tables should be touched. For what its worth my MAF screens are gone and I've considered going back to a stock one.

scorp508

Just got back from a 35 minute ride. BLMs didn't go lower than 135 the whole time the car was moving and were mostly 140-150 with a few areas over 150. Looks like there is plennnnnty more "across the board" work to do still.

tequilaboy

What fuel are you using? You might want to set the stoich target for E10 ~ 14.12 to richen things up globally.

scorp508

Good question. I never really paid attention each time I fill up, but E10 is probably the most prevalent if I think back.

I see Open Loop in the hac and put that into the XDF.

I can't put my finger on a closed loop value.

Searches in the HAC for "AFR", "Air Fuel", "Stochiometric", "Stoichiometric", and "14." don't quickly bring something to the surface.

Do the other Air/FUel % change tables base themselves off of the base open loop figure?

tequilaboy

The same value is used for stoich in closed loop, and is the base from which open loop and pe % changes are made.

Change this one value, and you influence the open loop, closed loop and PE targets all at the same time, which makes sense, since they are all relative to the stoich ratio of the fuel.

scorp508

Thanks again, TB. It does make sense, but with so many other values having both an open and closed loop value I wanted to make sure I wasn't missing it.

scorp508

So I put the MAF table back to stock and changed the AFT stoich constant to 14.12. The BLM at idle did drop a few as expected. I didn't get to take it out for a ride to see what the whole range looked like.

I'm also fighting a bit of a "wants to stall" issue if you tap the throttle even at idle. I did some digging and found others out there (RBob etc... over on thirdgen) that found an increase in stall saver had a backwards effect and caused the vehicle to stall. I had increased it from the stock 400/550 to 550/700 and the car actually did stall more often when letting off the throttle. For now I set the stall saver constants to 0 which has succeeded in preventing the car from stalling, but it still dips as low as 550 and sounds like its about to die before it catches and comes back up to idle.

I want to check out the IAC and go through the throttle reset procedure tomorrow evening to see if the TB blades are messed or the pintel is dirty. It reports itself as sitting at only 6 IAC steps during idle which seems too low.