How can I idle in open loop?

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Apr 1, 2007 | 09:26 PM

Blazin4x4

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Car: 1988 Chevy silverado K5

Engine: 350 bored .030, crane cams hyd bluprint l-79 cam 447 lift 272 dur, camel hump heads port and polished 1.94 1.50, afterburner headers and y pipe, holley 670 cfm tbi, holley projection dual plane manifold, accel high pressure fuel pump, 3 inch exhaust

Transmission: 700 r4 with corvette servo and shift kit.

How can I idle in open loop?

I know it invovles changing some delay paramaters but which ones and what do I change them to?

I'm running a 7747 with the amur bin and the 7747.mine ecu file for an .xdf.

Apr 2, 2007 | 08:22 AM

RBob

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From: Chasing Electrons

Car: check

Engine: check

Transmission: check

Re: How can I idle in open loop?

Here are the values GM used in one of the BBC open loop idles:

Code:

;----------------------------------------------
;
; OPEN LOOP IDLE CALIBRATIONS
;
;----------------------------------------------
LD29E:  FCB  10          ; 10 MPH, OPN LP IDLE THRESH
LD29F:  FCB   6          ; 2%, OPN LP IDLE THRESH TPS
LD2A0:  FCB  38          ; 950 RPM, Open loop RPM thresh IDLE OFF
LD2A1:  FCB  56          ; 1400 RPM, Open loop RPM thresh IDLE ON
LD2A2:  FCB   0          ; 0 Sec's, Open loop IDLE AFR Ratio enable TIME DELAY
LD2A3:  FCB   0          ; 0 Sec's, Open loop IDLE AFR Ratio TIME DELAY
LD2A4:  FCB 140          ; 14.0 Open loop AFR MAX AT IDLE
;----------------------------------------------

The BIN address is as shown without the leading 'LD' . So the first parameter is at BIN addy $29E. The values are shown as they are in the BIN, but in decimal. If these parameters are not in the ECU/XDF file, convert the values to hex and use the Hex Editor to enter them.

RBob.