MAF vs. SD

[Ward]

Actually MAF is a much beter method since it takse a lot of calulating out
to the process, SD converts RPM, MAP, Temperatue into a mass valuem
(Grams/second). A MAF system measures it directly in g/s.  

But... The old GM MAF's are very cheep and prone to failure,. The standard
"rap on the unit w/screwdriver hande" test would result in eratic MAF
readings. his usauly happened between 30K and 80K miles. 

This is why GM went to SD MY89 - 91/82 in F and Y cars. 
The waranty costs were too high. Finaly they developed a new MAF design with
adiquate range in or about 1992 (Y car). The new design has been trouble
free and meets the OBD II needs. 

It is interesing to note that they use MAF and MAP,

Glad to see that your getting on...

W.
 

On Wed, 13 Oct 1999 10:44:45 -0500, CSH-HQ wrote:

> The more I talk to folks the more it seems that what runs best for them is

> what they are most familiar with..  Some of ht folks around here will talk

> MAF, and some SD as being best.  I've played with both, read all the 
> comments in te archives numerous times, and at any one given moment argue

> one is better than the other.
>   Me, personnally, I like SD.  I've done a bunch of 747 chips, and well 
> since I base everything on past experience, well, that's where "I'm coming

> from".
>   That and again the diacom for the 730 is a wonderful tuning aid.
> Grumpy
> 
> >Thanks for all the replies about what to do for a VSS.... seems I've got
> >plenty of solutions now.   Big question now is still do I keep the '165
and
> >stay MAF, or try and get a '730 and go SD.
> >
> >>From what I've read so far, SD seems to be more tuned to the exact
> >application so it would reason that I'd be better off with MAF since the
VE
> >of my motor is probably nothing like a Chevy motor, much less my
> >displacement is higher and my intake volume/config is nothing like a
TPI.
> >
> >Also, is the current cal I have VATS?   ('89 165, APYU cal)
> >
> >Is there a problem bypassing the heater connections on the IAC body on a
> >TPI throttle body?   This installation's pretty ugly as it is.... if I
can
> >leave that off it would make life easier.   
> >
> >
> >--> Bob Valentine
> >--> bob at tecmark.com
> >
> 





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