On one of the local nissans forums i frequent, a suggestion to me was to advance the timing on my car.

i have an 04 G35 Coupe. their suggestion is to advance the timing +2 degrees.

i was also told that to utilize this advancement in timing i'd have to use 94 octane, i currently use 92 octane.
Where i live, 94 octane costs 3cents more than 92, not a huge difference, but what sort of gains can i expect from advancing my timing?

i believe the advancing will be done through a Nissan Consult, but i'm not too sure on the details right now.


What are you opinions? is it worth it? is it a noticeable gain?

Thanks!

 

from wat ive heard man the gains are minimal

 

Gains will be minimal, also if someone in you area has a cypher they can do it for you.

 

The 2 degree timing advance works well for the Titan, but not so much for the G. Uprev chimed in on another thread about this and explained it in detail. In short, don't do it.

 

What one wants is the peak [BMEP] pressure to occur a 15-16 degrees after TBC when this pressure exerts the maximal downward TORQUE on piston/rod to twist the crankshaft.

Fuel flame speed [burn rate] varies by the composition of gasoline. Flame speed changes with rpm due to residual heat [on piston, head, valves, cylinderwalls]. Flame speed is different for different A/F ratios = more gasoline milecules closer together.

Engineers and racers use pressure sensors between spark plug and head to read pressures and set individual ignition advance to squeeze the nth amount out of each cylinder. All cylinders are different and the optimum advance may be +- 1.5 degrees depending on exact [in and out] air flow and cooling of each cylinder.

Dyno testing to tweek ignition advance vs rpm is finding the best AVERAGE.
Unfortunately dyno acceleration time is FASTER than real world driving so the numbers set on dyno may not be optimum for the highway or drag strip.

Many oem software programs are different based on gear selected to compensate for acceleration time in that gear. Even in a manual transmission ecu is smart enough to measure rpm gain per second.

Winter gasoline is different from summer in flame speed so the ecu understands inlet air temperature [to attempt a match].

OEMs build in a safety reserve to protect against bad or grossly defective gasoline, engine wear, lazy spark plug changes, partially clogged injectors, slime and dirt build up.

Removing safety may work ok for years until that day you buy bad gasoline!

The BMEP curve can be overadvanced resulting in a loss rather than a gain. The curve is assymetrical in that less advance is better than too much!!!!!!!!!!!!!!!!! DUE to sudden knock sensor retard.

http://www.mce-5.com/vcr_strategy/im...ess_torque.gif

 

yeah dude, just get your timing light hook it up to the number one spark plug wire, and turn the distributor till you get your advance. oh, and good luck finding the plug wires and distributor hahhahahaha.