MAF TBI

[peter paul fenske]

Dear George

Not to take the wind outa ur sails but TBI metering is not terribly
accurate. I suppose you could use the TPI ecm, reset the mode
to aynchronous and change the injector constant. Prob quite a few other
things to make it go. But why. If you did this you would be 
able to completely reprogram your tbi. 

Airsensors I believe who are now outa business once offered such a
system. It was supposed to have worked okay.

To be honest when I ran the TBI on my truck I had more off idle
torque than the TPI right now. TPI comes on about 2000 rpm and is
better there.

And remember these systems have a self tuning factor of about 20% or so.
So oem even Map are relatively adaptable. Summit now sells a adjustable
regulator for TBI which would help more.
Also in the GM parts basket is a adapter which was used on 454 SS trucks
about 90 or so which takes the weird tbi bolt pattern to a slightly less
weird guadrajet/thermoguad bolt pattern. 

Ps has anyone checked out the ECM holley advertises for their DFI series.

GL George: peter who really doesn't know that much:
and is quite bogged down with DSP course




At 09:38 PM 3/29/97 -0600, you wrote:
>Yep Scot, so true. But ECM wizzards like you and Peter F. could burn a prom
>that would allow a MAF signal for a TBI system. When GM says TBI they really
>mean "The Bare minimum Injection equipment" 
>
>gmd
>
>At 09:42 AM 3/29/97 -0800, you wrote:
>>George M. Dailey wrote:
>>
>>> Ladies & Gentlemen, MAF TBI has the greatest potential of being the    
>>> "Holy Grail" of a universal fuel injection system for almost any       
>>> engine, from single cylinder to V12. Feed on this:
>>
>>George, neat idea, but GM really did not mix MAF and TBI.  There are no 
>>present older ECMs that do what you want.  
>>
>>I also agree with you that the OEM stuff is the way to go.  It justs 
>>takes a while to learn how it works.
>>
>>
>>> I'm not 100% sure that full asyncronus operation is possible or        
>>> desirable.
>>
>>The GM V-6 such as the TBI 4.3L are mostly always async.  They have an 
>>open plenum intake manifold and I guess that GM was worried about mixture 
>>distribution.
>>
>>Scot Sealander    Sealand at clarityconnect.com
>>
>>
>>
>
>