92 Camaro 730 w/healthy 350

[Dave Zug]

Now you are taxing my specific knowledge, which on this subject is nothing
more than recollection from reading online stuff (no experience here).

Its cell 15 I thought.

It knows that it is 14.7 *IF* all other settings have been applied
perfectly. closed loop is where I beleive it applies this, and in open loop
its a guess that is dialed in using the PE adder..ECM (730) locks the BLM at
128 during WOT. (you knew that),  If the ECM is trying for 14.7, and its
really 13.5, when it wants 12.0 then it will be just as far off, from what
I've seen. Trying to make it put out 14.7 when it thinks its putting out
14.7 is what we are after, therefore adjustments are real world and easier
to do and understand. VE is where this is tweaked, not changing desired AFR,
not with a false injector constant or a false engine size etc.

If the thrasher site says something, it is probably dead on, but I thought
it was cell 15. Is the thrasher sire talking about C3 Ecm's?

----- Original Message -----
From: <WEG1192 at aol.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, January 18, 2001 8:36 PM
Subject: Re: 92 Camaro 730 w/healthy 350


> In a message dated 01/18/2001 10:39:36 PM Eastern Standard Time,
> dzug at delanet.com writes:
>
> << The VE is more accurate if you get the injector const right and the AFR
> desired is not set wierd to manually compensate ahed of time.  in other
> words, you should not go straight to adjusting VE entries in a pig rich or
> lean car cause you may end up with 40's at WOT before the thing runs well,
> and you KNOW the engine is more efficient than that. make sure the engine
> size and injector const is right first, tunetips recommends attacking
idle,
> then cruise first (BLM's), then WOT. If in the coarse of tuning cruise
> ranges, you discover that you have to make massive changes in VE, you
> probably will be changing the rest of the VE stuff radically as well...
> depends on the combo. (and I *only* have actual experience with a 350NA,
> 350SC, and 350NOS using MAF, and part of a 350NA MAP (so grain-o-salt) >>
>
> Dave,
>
> I have a question that relates to all this. I read on Thrashers site that
the
> WOT fuel is affected by BLM cell 18 but only if fuel was added and not
taken
> out. Does the ECM "know" where 14.7 is from the adjustments to the VE
tables
> by the BLM when it calculates a lower AFR in PE mode, or is it based only
on
> the injector constant and engine volume without any corrections? You seem
to
> be saying that the AFR is only a calculated value with no basis on what
the
> engine has been telling the ECM it wants. JW
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