A new MAF location for the Turbo GNs

["Bruce Plecan" <nacelp@bright.net>]

 For those of you interested in tinkering with the 86-87 Buick Turbo cars:
 With the plastic cased MAF, the places seemed limited as to where to mount
 the original MAF sensor.  With the Translators, and using the Late MAF,
with
 the all metal case, that became less of a worry.   I'd heard the
electronics
 would safely handle 120dC (highest temp I'd seen with a relocated MAT , was
 140dF), so I started looking for options.  I'd also, heard of some follks
 having rather erratic LV8s, upon ocassions (idle / cruise).   So I figured
 having a location that for any given throttle opening had the air presented
 to it in a repeatable fashion would have to be an improvement.  An Open
 Filter, surrounded by so much turbulent air that it always was looking at a
 different amount of turbulence.   Also, while the turbo acts a great check
 valve for reversion, it's aways a retriction/delay at lower throttle
 openings to when the MAF saw any air flow changes.  So I thought mounting
 the MAF right up by the Throttle Body would have to be worth trying
   Anyway, just had to try  it.
   I had a spare I/C up pipe.  So I ordered a 3" section of straight hose,
 and a 2.5 to 3" one.  I figured out how much shorter the new pipe had to
be,
 to mount the MAF right at the TB opening.  The stock I/C up pipe doesn't at
 all tolerate expanding, in the curved region.  But we'd already cut it to
 lenght, and had the straight piece.  That did tolerate expanding *some*.
So
 we trimmed things, and did some welding.   Now, knowing what I do, I'd just
 get two of the 2.5" to 3" hoses ($$).
    Also, timmed the hoses to min lengths to get things to fit.    The new
 MAF is right at the TB using the 2.5 to 3" adapter hose and then the 3"
 straight piece to the I/C Up Pipe pipe, and everything *just* fits.  The
MAF
 is touching the turbo intake pipe.  A plenum spacer, a PT+E upper, or a
 hemco, might make this all a little easier to get in there.   There is no
 way I see to get a 3.5 MAF in there with out raising the upper Plenum.
Had
 to split the harness open to move the MAF sonnector over to the new
 location.  I mounted the MAF with it's connector pointed up on the drivers
 side as a matter of convience in case it would fail, I have a stock MAF in
 the trunk.   The Air Filter just hose clamped to where the MAF connected to
 the intake pipe.
    Does it make a difference?, it seems to.   My idle is rock steady (700
 rpm in D, with the 206 hyd roller cam, 40#/hr injectors),   and all cruise
 conditions seem more responsive.  You can even rev the motor in neutral and
 have a lot crisper responce.   Course more tuning in now needed along with
further test driving.
    The roads are way too cold for any real performance testing.
    Your results may vary, yada, yada.  Not to be attempted without adult
 supervision.   may be illegal, may cause severe engine damage, even may
 cause blindness,
 Cheers
 Bruce


----------------------------------------------------------------------------
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