Read chenga's later post after his So. Cal. dyno run (on this site, where I previously indicated). The post you referred to on 6mt.net is old. In any case TS could certainly adjust timing advance curves for any octane you tell them you'll be running. In my case the TS option is out (ULEV2). Ideally Stillen would make a system which would allow for two modes: 1) bypass (stock ECU), 2) manual controlled timing advance (i.e. a ****) with a conservative, but less so than stock A/F ratio, say 13:1 at higher RPM.

2004.5 G35 Sedan | Garnet Fire + Willow | 6MT | Z-Tube, K&N panel | Stillen Cat-Back

 

BTW: The Stillen unit would only need to advance timing at higher RPM to provide some measureable (3,5,8?) hp gains, in much the same manner that the FI guys use adjustable timing retard units, in-line. The "mods" are largely irrelevent as far as timing curves are concerned. For A/F that's a different story. I, personally, would prefer a manually adjustable system (again, like the FI guys use) for timing, with only slight A/F changes from stock (in case you're listening Stillen...). In my experience, 4-6 degrees of extra advance can be acheived with pump fuel (at say 5000-rev. limiter RPM). As was apparent from the A/F plots on our dyno-day, Nissan is very conservative with both timing and A/F at higher RPM. On race karts for example (no fancy ECU), changing jetting to run leaner and/or advancing timing (which effectively makes the engine run leaner) both increase hp, up to a point. Go to far and piston has a nasty tendency to stop sliding nicely in the cylinder - at 14k RPM that's BAD! The same principles apply for any internal combustion engine - run too lean, or with too much advance and temps. go up (and clearances go down) - engine wear increases. Since the ECU program isn't bypassed by the Stillen unit, the knock sensor would still be functional and provide some measure of safety. Again, I have no personal experience playing with A/F ratio, only timing advance. I can state that my G35 with ULEV2 pings using 91 pump, off idle to maybe 2k RPM. This was clearly Nissan's way to get reduced emissions (the whole point of ULEV and ULEV2). The dyno operators suggested they'd seen that often as a "trick" to get better emissions numbers. The manuf. knows exactly in which RPM range smog tests are performed, and can tailor for that. We used to have un-loaded (neutral) test in Ca. Now we've switch to in-gear loaded testing. So, as the manuf. play tricks, CARB fights back and changes the rules...

2004.5 G35 Sedan | Garnet Fire + Willow | 6MT | Z-Tube, K&N panel | Stillen Cat-Back

 

I wonder what TenchnoSq does to the knock sensor?

2003.5 DP 5AT Sedan
14.2 @ 97.18
Z-Tube
K&N Drop In & Airbox Mod
10 Wire Hyper-Ground
Crawford Plenum (V4)
UR Crank Pulley
Hotchkis Sways (M/M)
Polk EX-3500 Tweeters/Shock Sensor/H-Liner