Re: A new MAF location for the Turbo GNs

[Matt S Bower <m.s.bower@cummins.com>]

Sounds like a slick job.  Sounds like a winner to me.

Pretty cool stuff the little guys come up with sometimes.

Matt

Bruce Plecan wrote:
> 
>  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
> 
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