[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: MAF BLM based tuning
Dave Zug wrote:
> (This is for MAF '165 ARAP... 383 app)
Is is a stock MAF? Not gutted?
> Given that the BLM cell seperators are 13,21,34 g/s, and 700,1200,2000
> RPM...
So the MAP looks like this: (Whoops, used MAP!) :-)
AirFlow BLM Cell
34 to 255 12 13 14 15
21 to 34 8 9 10 11
13 to 21 4 5 6 7
0 to 13 0 1 2 3
RPM -> 0-700 700-1200 1200-2000 2000-6375
> and as an example, say cells 6 and 10 show high values (160) and the rest
> are fine (low 130's).
Is this a real example? Then only at 1200 to 2000 RPM and between 13
and
34 gps you do have a problem. Why not cell 2 or 14 ? A BLM rise to
160
represents a 25% error in the MAF reading. That is a big error. Is
there
a vacuum leak? Like the can purge hose is off? This would create a big
leak that would make the BLMs climb, and probably only in those cells.
Disable the CP and see what happens.
If you are truly grtting 160 BLMs, I would look for something wrong
before
trying to recal the MAF tables.
> Since I have no VE tables to speak of, What would be a good first step in
> settling the bad BLM's back to normal, without affecting the rest of the
> good BLM's?
Make SURE everything is OK before trying to re-cal. I think if you
re-cal,
you may find a cell 2 or 14 problem. Try disabling the Can Purge and/or
EGR and anything else that may interfere before trying to re-cal.
If this is not a problem, slowly change the MAF table values around
the troubled airflows, 13 to 34 gps.
> Please respond without using the word "MAP" ;-P
Sorry!
> Extra credit: Anyone tried expanding or sliding the range that BLM's
> affect? like 13,27,40 and 700,1600,2800?
I use just three cells. At Idle, Off idle, or coasting. And the 3rd is
not
really needed.
Scot Sealander
----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org