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Thread: SR20VE Help Need-Ignition Timing Fighting Me - High RPM Misfire-Sounds Like Anti Lag

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Posts: 61-68 of 68
2015-07-01 16:36:45
#61
OK. Alternator gives 14.4 at idle.
13.5V at 6k RPM and closed throttle
12.4V at full throttle at 6K RPM

Is it possible the VVL solenoids are draining the system?

I have them connected directly to the battery with a relay doing the switching duties.

0.2 voltage difference between positive on batt and positive on alternator
0.1 voltage diff between alternator case and neg terminal on batt
2015-07-01 17:37:23
#62
Originally Posted by VE-Baller
OK. Alternator gives 14.4 at idle.
13.5V at 6k RPM and closed throttle
12.4V at full throttle at 6K RPM

Is it possible the VVL solenoids are draining the system?

I have them connected directly to the battery with a relay doing the switching duties.

0.2 voltage difference between positive on batt and positive on alternator
0.1 voltage diff between alternator case and neg terminal on batt


Both solenoids together draw 2.5-2.7A

You should also check the voltage drop from battery to ECU pins 36(IGN) should be close to the same.. I suspect on main ECU power Pins 47&38 may be off a bit more.. Should be under 0.3V..

- - - Updated - - -

It almost sounds like it could also be bad power supply to the Coil ...
2015-07-01 17:49:07
#63
hmmm, ill put the multimeter on it
2015-07-11 10:02:42
#64
an update on the situation. I pulled out the FIC and reinstalled the Apexi AFC Neo. No problems.

I am not saying anything against the FIC. Maybe I had installed it incorrectly.

What I will comment on, is the way the FIC deals with timing adjustment. It manipulates the timing signal TO the ECU.

The Greddy Emanage taps the timing signals and directly alters the ignition OUTPUT.

The Greddy method to me, seems much more logical than splicing the cam and crank signals. Splicing, in my opinion, is asking for trouble with interference, ECU safety measures etc etc.

Car is not as fast as with the FIC but I am working on fuelling, I will upload an ECU talk log when I have it.
2015-07-12 14:51:53
#65
Originally Posted by VE-Baller
an update on the situation. I pulled out the FIC and reinstalled the Apexi AFC Neo. No problems.

I am not saying anything against the FIC. Maybe I had installed it incorrectly.

What I will comment on, is the way the FIC deals with timing adjustment. It manipulates the timing signal TO the ECU.

The Greddy Emanage taps the timing signals and directly alters the ignition OUTPUT.

The Greddy method to me, seems much more logical than splicing the cam and crank signals. Splicing, in my opinion, is asking for trouble with interference, ECU safety measures etc etc.

Car is not as fast as with the FIC but I am working on fuelling, I will upload an ECU talk log when I have it.



I can assure you tapping into the cam signal will not have any affect as long as proper splicing methods and wire shielding is used. I have introduced all sorts of noise into the ECU via the cam sensor wiring. Nissans ECU are pretty fool proof. For example, once the vehicle is started, you can disconnected the cylinder position cam sensor wire and the engine will still run. The most important wire is the cam reference. The engine will not run if this is disconnected. As for your issue, no clue. But keep us updated.
2015-07-21 11:44:17
#66
Here is the ECU Talk log from a full throttle run in 2nd gear.

Summary - Voltage higher than with ECU, about 1.3 volts higher. Starts dropping off above 6700 RPM

Car runs perfectly now. You need to add 6 degrees to the timing values in the list to get real value.

Can I run more than 33 degree advance?

RPM SPD VLT TPS TIMING
6550 126 13.6 4.38 27
6612 126 13.52 4.38 27
6575 126 13.6 4.38 27
6612 126 13.6 4.38 27
6612 126 13.44 4.38 27
6612 126 13.44 4.38 27
6612 126 13.52 4.38 27
6612 126 13.52 4.38 27
6612 126 13.6 4.38 27
6600 126 13.6 4.38 27
6625 126 13.6 4.38 27
6637 132 13.68 4.38 27
6637 132 13.68 4.38 27
6675 132 13.68 4.38 27
6650 132 13.68 4.38 27
6637 132 13.6 4.38 27
6687 132 13.6 4.38 27
6662 132 13.6 4.38 27
6712 132 13.6 4.38 27
6737 132 13.6 4.38 27
6700 132 13.6 4.38 27
6712 132 13.6 4.38 27
6700 132 13.68 4.36 27
6725 132 13.68 4.36 27
6750 132 13.68 4.38 27
6775 132 13.68 4.38 27
6762 132 13.68 4.36 27
6775 132 13.52 4.38 27
6762 132 13.44 4.38 27
6775 132 13.36 4.36 27
6775 132 13.28 4.36 27
6775 132 13.12 4.36 27
6775 132 13.12 4.36 27
6800 132 13.12 4.36 27
6862 132 13.12 4.36 27
6887 132 13.04 4.36 27
6837 132 12.96 4.36 27
6800 132 12.88 4.34 27
6837 132 12.96 4.3 27
6800 132 13.12 4.24 27
6812 132 13.04 4.12 27
6862 136 13.2 3.82 27
6862 136 13.28 3.58 27
6900 136 13.2 2.94 27
2015-07-21 14:24:03
#67
about the timing, my answer is here http://www.sr20-forum.com/tuning/77885-sr20ve-help-need-ignition-timing-fighting-me-high-rpm-misfire-sounds-like-anti-lag.html#post1023643
2015-10-21 10:28:46
#68
About the low voltage. I re-did the wiring for the ECU. I was using crappy crimp connectors that come with the hard plastic insulation around the terminal. Changed to high quality crimps and used heat shrink to insulate. Voltage is up to 13.8v at idle, 13.6 with blower on full and full beam. Car seems normal now. I love Nissan, after this substandard electrical work, it still forgives me. Touch wood.
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