Interesting experiance with Injection timing
06-28-2009, 06:55 PM
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Interesting experiance with Injection timing I messed with this value on my 454 and it seemed to make it run a little better at idle so I figured I would mess with it on my wife's dragster.
The dragster has a 2001 LS1 with PRC 2.5 Heads and MS3 cam, all else is stock and has 80K miles on it.
First run at the track was with no changes from prior runs for the past year, corrected altitude was 7123 and the times were typical for the D/A:
60 -> 1.338
1/8 -> 5.899
MPH -> 116.65
1/4 -> 9.270
MPH -> 145.02
Did nothing but add 20% to B3702 Injection Timing across the board, this in EFILive. The next run the D/A was 7380 which is little worse then the first run:
60 ->1.305
1/8 ->5.822
MPH ->117.73
1/4 -> 9.164
MPH ->146.38
It was a pleasant surprise to see such a huge reduction in ET. At this point the WB02 was reading rich so I leaned it 2% and it ran:
60 -> 1.311
1/8 ->5.801
MPH -> 119.01
1/4 -> 9.103
MPH -> 148.44
We're talking .17 reduction because I changed the injector timing which in turn show it running too rich. Keep in mind that the program I have has been running since last year and being a dragster what extremely consistent, so this is a true reduction.
Next time out I will get the WB02 correct then add some more to B3702 and see if there is even more to be gained. It's amazing how the air/fuel mixture changed so much....
Food for thought.
Lee
The dragster has a 2001 LS1 with PRC 2.5 Heads and MS3 cam, all else is stock and has 80K miles on it.
First run at the track was with no changes from prior runs for the past year, corrected altitude was 7123 and the times were typical for the D/A:
60 -> 1.338
1/8 -> 5.899
MPH -> 116.65
1/4 -> 9.270
MPH -> 145.02
Did nothing but add 20% to B3702 Injection Timing across the board, this in EFILive. The next run the D/A was 7380 which is little worse then the first run:
60 ->1.305
1/8 ->5.822
MPH ->117.73
1/4 -> 9.164
MPH ->146.38
It was a pleasant surprise to see such a huge reduction in ET. At this point the WB02 was reading rich so I leaned it 2% and it ran:
60 -> 1.311
1/8 ->5.801
MPH -> 119.01
1/4 -> 9.103
MPH -> 148.44
We're talking .17 reduction because I changed the injector timing which in turn show it running too rich. Keep in mind that the program I have has been running since last year and being a dragster what extremely consistent, so this is a true reduction.
Next time out I will get the WB02 correct then add some more to B3702 and see if there is even more to be gained. It's amazing how the air/fuel mixture changed so much....
Food for thought.
Lee
07-04-2009, 07:48 PM
#2
9 Second Club
If you can, tune injection timing until it reads richest. This way you can assume more of the fuel being injected, is actually getting burnt in the cylinder.
It's just making more efficient use of the fuel.
It's just making more efficient use of the fuel.
