MAF Sensors Placement

[John Hess]

Unfortunately, the MAP system requires EPROM recalibration for 
seemingly modest changes in the engine.  The MAF system, while quite 
probably unable to produce the power the MAP system can (increased 
restriction of the MAF sensor), it adapts much easier to engine 
modifications.

John


----------
From:  Mark Eidson[SMTP:mark.eidson at tempe.vlsi.com]
Sent:  Thursday, December 12, 1996 10:01 AM
To:  diy_efi at coulomb.eng.ohio-state.edu
Subject:  Re: MAF Sensors Placement

It seems that if you have capability and desire to play with you 
system that
MAP is a good choice becasue it is simpler/cheaaper to implement 
physically.
I have noticed the effect of acceleration and deceleration on mixture 
on my
system but don't have the capability to compensate for it.  me

At 06:23 PM 12/11/96 -0800, you wrote:
>Mark Eidson wrote:
>>
>> Todd, with the problems you have described does MAP work better for 
these
>> applications?  me
>
>
>Mark,
>	Map does get rid of the back flow, turbulence, low speed resolution 
hot
>wire type problems, but doesn't get rid of the intake manifold 
resonance
>problem and certainly comes with its own share of problems.  It 
needs
>barometric, temperature and acceleration compensation, and does not
>correct for engine changes over the long term.  Small changes on the
>engine also affect the map sensor system whereas the hot wire works 
fine
>with camshaft, cylinder head, and exhaust changes improving the 
flow.
>	I've personally had quite a few bad experiences and currently go to 
MAP
>on all our high performance systems and have been very happy with it. 
>If I were an OEM, I would probably think hard towards using MAF, but
>they don't run 750hp through a 3.6l twin-turbo 911 either.
>
>Todd Knighton
>Protomotive Engineering
>
>
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