[Diy_efi] 749 tweaks

[Jim Sloan]

There needs to be a fairly smooth transition between the closed throttle
table (F29E) and the open throttle table (F29). You may need a lot more fuel
than you expect off idle.  I don't think there is an F31E table.  Other than
that, you are on the right track tweaking the AE settings, IMO.  

Jim
-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of Bill Shaw
Sent: Saturday, July 07, 2007 2:20 PM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] 749 tweaks

I'm working on a cal for my new 5.0L 928 engine and I'm having some trouble.
I've had this basic setup running pretty good for several years and dozens
of track days now - Porsche 4.7L V8 with LT1 throttle body, SyTy ecm
(1227749) running a max of 9 psi from a Vortech blower.  
Recently I've 'improved' things - bigger 58 mm throttle body vs stock 48 mm,
bigger cams, bigger injectors, extrude honed heads, headers, bigger exhaust.
I started with the same bin I ran on the previous motor and dropped bpw vs
%egr a bit to compensate for the cumulative engine/injector changes then
tweaked F31E base VE vs RPM & Map, and  F30 base VE vs RPM to get it to
start and idle.

It's starting and idling pretty good now,  but as soon as I touch the
throttle the injector pulse width goes from about 4 ms at idle to about
1.5ms. It spits & pops as long as I keep the throttle open and won't rev
past about 2k.  As soon as I close the throttle I see the injector pulse 
width jump to 6 ms or so.   I've tried increasing the AE delta throttle 
and AE delta map tables with no real change.  Any ideas why it's shortening
the pulse width when I crack the throttle?  Where should I look to  increase
the pulse width?

Thanks,

Bill
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