DIY_EFI Digest V5 #48

[nacelp]

> > I don't see the logic in eliminating the FMU.  It's the only thing
raising
> > your fuel
> > capacity.
> The FMU is very inconsistent when it comes to increasing the fuel
> pressure in relation to boost.  It's not even a proportional
> rising rate.  On one run it might have A/F right on while the
> next run it's way off.  This device has already cost me an
> expensive rebuild because I leaned out at WOT.

So you got a junk FMU, then.
That's all that says, same logic would be I got a bad brandx spark plug so
I'm coverting to diesel.  Sounds like you've heard so many rumors that
you've fallen into agreement with them.  Which is fine, but saying FMUs
don't work, or it cost you an engine is an error, IMHO.  If you had been
monitoring things closer it wouldn't have happened.

> It's not the only thing raising fuel capacity.  The goal here is
> to install larger injectors, set the fuel pressure back down
> where the injectors are rated for and calibrate the PCM for max
> power.  Currently I run about 95# fuel pressure through my stock
> 24# injectors at 6# boost.

Oh, and had you mentioned that before??...
What pump are you running that has enough flow at 95 PSI to support your
engine?.  Have you actually tested to be sure there is an excess of fuel?.
Were you trying to run the FMU at 95ish PSI?.  Did you find out if it would
work at that level to begin with?.

  The problem comes in where, as you
> stated, the LT1 has no provisions for boost.  The question is how
> to accomplish this using the existing PCM programming while
> altering the EEPROM tables using the recently written LT1 Editor
> program.

All you can do with the existing editor's is set things for when the sensors
max out.  Ya need to rethink your strategy.  The hardware, AND software have
to work together......
Grumpy
>
> Dave has written to me asking the same questions.  He wants to
> know if there is a way to help the PCM accommodate boost.  Short
> of a completely different program, I think we are stuck on
> fooling it into thinking 14.7psia (1 bar) is actually 6# or 10#
> boost.  As far as I know there is no way to get the PCM to
> properly use a 2 bar MAP.  Am I wrong here?  With enough changing
> tables could you get the PCM to work correctly using a 2 bar MAP?

Not from what I've seen, it takes a program change.
Are ya'all running MAP, MAF, or both?.   Meaning have you defaulted to one?.
If your running MAF do what the guy told doc to do!.  Use the large MAF.
Bruce
>
> --
> Glen Beard  95 T/A conv M6
> 355, Vortech, heads, cam...
> http://home.nycap.rr.com/gbeard1/TransAm.html
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