Tip in fuel & timing question.
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Member
Joined: Mar 2002
Posts: 277
Likes: 1
From: Boston, MA
Car: Corvettes
Engine: Modified L98 & LT5
Transmission: DN 4+3 & ZF6
Axle/Gears: 3.07 & 4.10
Tip in fuel & timing question.
<b>My image host seems to be going up and down, please forgive me.</b>
The car:
1987 Corvette
Stick Shift
Dana 44 w/3.07 gears
165 ECM & $32b code.
Superram upper & lower with 219 cam
1.6/1.6 roller rockers
D-Port heads, ported/polished, 2.02/1.6 valves, Ti retainers
Hooker 2149 headers, hooker y-pipe, no cats, flowmaster catback
Ok so I made these couple of changes from my program #4 to #5 in the quest for trying to kill the hardcore bog I experience going WOT in 1st gear off idle or low RPM.
<b>LV8 Accel. Enrich. Factor vs. Delta LV8:</b> Added 0.05 to first 3 fields
000 / 0.18
064 / 0.18
128 / 0.21
192 / 0.20
256 / 0.20
<b>Minimum Delta TPS for Accel. Enrich:</b> Changed from 12.5 to 9%
The result seems to have moved the injector "bog" down from 3500 to 3000 RPM. That is nice, but I'd like to get it even lower and get rid of the injector pulsewidth dips that you see when the TPS goes full throttle. First pic is 4 and second pic is 5 with those changes.
Program 4
http://personal.tmlp.com/scorp/vette.../scratch-4.gif
Program 5
http://personal.tmlp.com/scorp/vette.../scratch-5.gif
On another note my total timing drops off to about 26* as soon as the gas is nailed when the LV8 is in the 200 area and then things level out around 36* when the LV8 is around 220 and the RPM increase. Think it would hurt to bring it into 36* sooner and just try to flatline the timing table to that value?
Here is the current Spark Advance vs. LV8 vs. RPM. Add 6* to each value for total timing.
http://personal.tmlp.com/scorp/vette...ch-5-spark.gif
The car:
1987 Corvette
Stick Shift
Dana 44 w/3.07 gears
165 ECM & $32b code.
Superram upper & lower with 219 cam
1.6/1.6 roller rockers
D-Port heads, ported/polished, 2.02/1.6 valves, Ti retainers
Hooker 2149 headers, hooker y-pipe, no cats, flowmaster catback
Ok so I made these couple of changes from my program #4 to #5 in the quest for trying to kill the hardcore bog I experience going WOT in 1st gear off idle or low RPM.
<b>LV8 Accel. Enrich. Factor vs. Delta LV8:</b> Added 0.05 to first 3 fields
000 / 0.18
064 / 0.18
128 / 0.21
192 / 0.20
256 / 0.20
<b>Minimum Delta TPS for Accel. Enrich:</b> Changed from 12.5 to 9%
The result seems to have moved the injector "bog" down from 3500 to 3000 RPM. That is nice, but I'd like to get it even lower and get rid of the injector pulsewidth dips that you see when the TPS goes full throttle. First pic is 4 and second pic is 5 with those changes.
Program 4
http://personal.tmlp.com/scorp/vette.../scratch-4.gif
Program 5
http://personal.tmlp.com/scorp/vette.../scratch-5.gif
On another note my total timing drops off to about 26* as soon as the gas is nailed when the LV8 is in the 200 area and then things level out around 36* when the LV8 is around 220 and the RPM increase. Think it would hurt to bring it into 36* sooner and just try to flatline the timing table to that value?
Here is the current Spark Advance vs. LV8 vs. RPM. Add 6* to each value for total timing.
http://personal.tmlp.com/scorp/vette...ch-5-spark.gif
Last edited by scorp508; Sep 23, 2003 at 08:21 PM.
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