Before I had the wells Maf, I was using a stock ported Maf with screens removed. My blms were basically lean with my chips, so I opted to replace Maf with Wells unit. Now using this new sensor blms are as low as they can go (108) int is low too (barely breaking 100) Why would this be (wouldnt it be opposite/run lean with Wells unit?)
Right now I have injectors in prom set at 36 for my SVO 30's, and pressure at 46psi. Should I start lowereing my fuel pressure, or should I play around with MAF tables (would I raise #'s to make leaner?) I havent played with these tables yet, and its more of a global effect that Im looking for (blms go to 108 in most cells at all driving times, except idle-usually 126-128, but after being at idle for a min or so, system goes to open loop.
I just dont get why this MAF would present these problems, especially since it should flow more air than stock- or--
is it that my ported maf with screens removed proposed more problems for my tuning?

Im open for any suggestions on this, or hear any similar probs that people have faced with wells MAF.
Thanks

 

well I did some more thinking and realized I was using Moates new software (850), which is something I havent tried out yet. I used the 845 and everything went a little better. I saw a lot more of the 128/128 that I should be seeing, but there were still a few spots where blms dropped to 118 or so. I also noticed that my int has been dropping as well, does this just mean that I need to drive with prom in some more? I thought that this # was to be 128 or close at most times, like the comp trying to adjust for best #s. If not, how can I adjust for int #s to be 128?
Sorry for these questions, Ive been out of the loop for most of the winter season, but now that its nice out I can play again.
Thanks

 

Try dropping your fuel injector constant, but if you are seeing close to 128 most of time leave it alone.

 

Thanks for the suggestion, but wouldnt dropping the injector constant make me run richer than I already am? Is there anything wrong with setting fuel reg pressure back to stock, or closer to stock, or will I eventually run lean at WOT. Right now I have inj constant at 36 for my SVO 30s, this just sounds wrong to me. My fp is at 46psi, and stays there through out runs. Should I leave my inj constants at like 33-34 like suggested everywhere for these inj, keep pressure at 46, and just play with MAF tables?
I havent played with these tables yet, but I would imagine that increasing the grams per sec would make engine run leaner as the rpm's increase in table. Is this correct, or do I have things backwards? After going for another run I see that cell 10, 15, 6 and 4 are all pretty rich (114-120) while 9, 11, 13, 14 are all 128 across the boards. Usually int is also very low when in rich cells, although that makes sense. Any suggestions with the MAF tables would be great.
Thanks

 

I meant increase if you are running rich. If you are close to 128 most of the time I would leave it alone. Setting your pressure back to stock would probably be a good idea, as those injectors are fairly large anyway.

 

By doing that you fubar'd the calibraion of the MAF.

So by changing MAFs your to square one.

Go back to all stock fuel pressure and tune settings, then stock MAF settings, THEN start TUNING.

Then you'll get a wrinkle free calibration,

 

Happy Easter to everyone!

I tried a few different changes in the prom to get me going, and so far its getting a little better. Ive been doing what Grumpy suggested and played with constants and bat volts, while retaining stock MAF tables and fuel pressure set at 38psi. So far my inj constants are now set at 38lbs, and the motor is still running too lean. Most cells are at 114-118, so they are increasing from the 108 I had previously. My idle is on the other end of the spectrum and is a little lean, but bat volt adj should take care of that later. Should I still turn down FP, or should I increase inj constants? Ive also looked at the Tunercat Table labeled "MAF vs. RPM (Diag)" and compairing these #s to the ones that the scans are showing me, the tables are off and the #s are too high. Would changing these #s lean everything/anything out?
The reason why everything is so out of whack for me is that I changed to a Wells MAF unit, and installed heated o2 sensor, before these mods everything was in the ballpark. I will keep experimenting with this stuff, but I would really hate to be going backwards, or worse yet kill the motor. Any help or suggestions or even hypothesis' at this point would greatly be appreciated.
Basically Im looking for someones opinions on fp and why the hell I have to set my SVO30lbs injectors so much higher in the constants then everyone else. Most people are using #s like 33 or 35 for these injectors and comming up with 128 across the boards, but I cant even get out of rich with FP so low and constants #s so high (38).
Sorry so long, just getting a little worried with this tuning at this stage. Thanks

 

Well I got to do a lot of tuning and note taking today and think I made some progress with my problems. Ive got a good amount of my blm cells to be close to 128, but with most concentrated on my cruising speeds while in 6th gear. This is without hiway mode envoked, so there is still plenty more fuel savings much, much later on. I kept fp @38psi and finally ended up with inj constants at 41. I played with bat volt so idle was a perfect 128, but it idles now in cell 0, I know I read somewhere that cell 4 was for idle, but cant remember now. While cruising I also see my o2 sensor reading very low, double digits low, but blms, int, and even fine fuel are all around 128. Should I be concerned or is this just the switching. It will go from say 58 but then go to 850 all in the same cell with no change in blms, etc...
I had to fudge with the MAF table 1 as well, but only changed the 1st 4 or so and just added 1 or 2 g/sec to each one.

Idle is good and so is cruising, but now after cruising and then comming to stop, to car is a dog. It needs more fuel there, and is usually when on an incline when I have to cross a major intersection or something like that. Just my luck, but at least I know not to take any chances while its like this.

Any other suggestions on these topics would be appreciated big time, or maybe just a few opinions on what Im doing so that I can proceed with good fortune.
Thanks,
Joe