Re: Cam tuning

["Jim Wilson" <Wilson.James4@worldnet.att.net>]

   Roger and Bruce,

  What I am trying to do is adjust the tables at 100KPA using the RPM to
approximate the value entered for VE enrichment. This combined with the AFR
to RPM and AFR to Coolent temp at WOTenrichment seems to be working for my
10# Vortech setup. Granted there is a lot of trial and error involved to see
what works best.
    Also I am using the same procedure for the timing.

                              Jim


-----Original Message-----
From: Roger Heflin <rah@horizon.hit.net>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: Tuesday, March 21, 2000 9:25 AM
Subject: Re: Cam tuning




It should not be that difficult to modify the stock computer to use a
3bar sensor, I wonder if the following would work:

modify the A/D input code to read in a 3bar value (0-255) and convert
it to an equivalent 1bar value (0-255), and save the real pressure
someplace else, that way you don't need to dig through the code and
find all of the instances and figure out how a 3bar vs. 1bar sensor
affects that code.   I looked at the code, and way too much stuff uses
the map reading for various things.

Then in the fuel calc code when the map is 100kpa multiply things
times the real pressure (ie if the real MAP is 150kpa, multiply the
fuel times 1.5).  1.5x the pressure should give 1.5x the flow or will
a conversion table be required?

Will this work, or will more adjusting need to be done?

Roger

On Tue, 21 Mar 2000, Douglas Ratcliffe wrote:

> So what kind of difficulty would there be in converting to a 3-bar Syclone
computer?  Other than the fact there's 2 more cylinders and 1.4 L more
displacement, are there any other factors?  Is the Syclone batch-fire MPFI
like my Camaro?
>
> Would the sensors and electronics (coolant temp, IAT,Idle motor,
injectors, OPTISPARK!) even be compatible?  Wouldn't my computer have a
hissy-fit?
>
> How much is a computer like that?  Isn't only in the turbo cars?
>
> Doug R - Black 93Z A4 3.73 - D.B. F-Body Organizer
> Mods: DragRadials,Hooker 1.75" headers,Flowmaster,AS&M CAI
> Mods: 3.73 gears, SLP Torsen, S&S Stage 1 heads, UD pulleys,
> Mods: Chip,EibachSprings,1LEswaybars, AFPR - 13.11@105.5
> *My car: http://daytona.f-body.org/doug
>
> >>> nacelp@bright.net 03/21/00 07:00AM >>>
>
> There seem to be some of you thinking that adjusting the 100K/Pa part of
the
> VE tables makes for a correct calibration, this is an error.  It's a way
to
> get a car to run, but that's all.  If yo think it's right then just use 3
> different values for the VEs at all ohter entries, and try running it.  To
> run the same fuel at 100K/Pa as you need at 150 K/Pa is a hodge podge.  If
> you don't beleive me, hunt up someone running a 3 bar MAP syclone, and
find
> out.
>   OK, lets even completely ignore the fuel, then we still have the timing
> issue.  Or is the resolved by an on/off switch MSD multistep or some such
> item.
>   Either way your just patching stuff together stuff to run.
>   Better solution is actually doing what John is with his 730, and make
the
> code changes to the ecm/pcm, or use a syclone (749) to actually do the
> engine mangement, or ecm/pcm/stamp/PIC to handle the boost issues corectly
> Grumpy
>
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