whats up fellas

I recently advanced my timing to 16btdc.

I'm going to dyno and tune again. My a/f is probably around 12.5. I am going to lean it out more probably to 13.

My question is when I do this is it going to advance my timing even more?

 

anyone have input or experience

 

u have an aftermarket ecu?my experience with timing advance is it works for 6 ignition cycles and then the ecu(stock) resets itself to oem spec.....this is what i was told at a garage when i tried to have it upped to 17degrees....maybe they just didnt have th epropper equipment to do it or they were stupid...has anyone tried looking to see if thier timing was still advanced after driving the car around for a week? sorry to jack your thread.
the guys at the shop told me and my buddies that an aftermarket ecu was needed to advance timing

 

The prom in the ecu is where this kind of information is stored (timing advance). How do you plan to change your A/F ratio??

BTW: How do you estimate your A/F is 12.5:1?? If you where running that rich your ecu would have leaned your fuel trims to the set allowable limit then would have set the mil.

 

I heard after 2000 rpms the o2 sensors dont adjust anything. I have the safc-II.

I know in some areas my car has a 12.5 a/f from my dyno graph.

I had my timing advanced to 16 btdc last fri. I will try to go back and check if it's still the same. They did it with the consult-II. They don't make aftermarket ecu's for our cars they just reflash but I think it's the same as using the consult-II.

 

I may be wrong here, but I don't think the computer adjusts so much on rpms as it does on throttle position and driving conditions. I.E. I would assume with fed laws that cruisng down the interstate @ 85 and 3000 RPMS still causes for a 14.7:1 A/F ratio....
Under throttle snaps or WOT I can beleive this.
I'm not to up to date with Nissan prom tuning, but I've heard about the "technosquare" ecu on this forum mentioned a few times. I'm assuming that is a reprogram to change your timing maps, rev limiter, etc.. The consult-II doesn't do to much for performance. Only changes your idle timing which adjusts as soon as you put your foot on the pedal anyways.


To be honest, I don't know much about fine tuning A/F ratios, I'm going to have to research it. One would assume that unless you had mods like larger valves, ported/polished intake, larger exhaust, bigger injectors, pump, and pressure regulator that Nissan would have set up the correct fuel trims for optimal performance straight from the factory.


Anyhow free bump.

EDIT:BTW, You may have better results posting this in the dyno or N/A section.

 

sorry for noobness, but that is the point and benefit of doing timing advance?

 

Timing anvance done with the Consult II will stay where it's set unless changed with the consult II. That's true for the 5th gen and 5.5 gen. The earlier cars would reset themselves.

You won't have to change the timing after leaning it out. The timing that can be adjusted with the consult is the "closed loop" timing. That means only at lower RPM at partial throttle. When you stomp on it the timing will advance more anyway. The only way to advance the open loop is with a reflash like technosquare.

You'll usually have a rich spot around 4000 RPM when the VAIS opens. I don't think that can be tuned out. This dyno shows the benefits of proper fuel mix on an 02 with only an intake, Y-pipe, B-pipe and of course Apexi SAFC2. This was the first dyno tuning so it started out pretty rich.