Help With My Log 2g Timing Prob

[cfisher]

CAN YOU GUYS HELP ME OUT WITH THIS ONE. HERE IS MY LOG BELOW. MODS (FRANK 2 TURBO, RNR O2 W/38MM TIAL EXTERNAL WASTEGATE, 680CC INJ, WALBRO 255 FP, SS TUBULAR HEADERS, BLA, BLA, BLA,) ANYWAY TAKE A LOOK. I'M HAVING MY MAIN PROBLEMS BETWEEN 3-6K. TRIED TO RICHEN IT UP BUT NO HELP. IS THIS NORMAL FOR A 2G TO HAVE TIMING PULLED LIKE THIS WHEN I FIRST HIT BOOST OR DO I NEED TO CONTINUE RICHENING THINGS UP. IT DIDN'T SEEM TO HELP.

RPM TIMING O2 VOLT
2949 21 .92
3351 13 .93
3820 10 .95
4359 11 .98 ?? (timing bad but 02 good??)
4886 11 .98
5414 13 .98
5910 17 .98 (good timing and 02)
6367 17 .98
6738 18 .98
7074 20 .98

ANY IDEA'S FELLAS. WHY IS MY TIMING SO LOW BUT O2'S ARE OKAY?

 

[cfisher]

3rd Gear Pull By The Way!

 

[slice]

It'd be nice to see throttle position at each RPM level. Your O2s are actually a little high, most people try to get them between 0.9 and 0.95, but that's OK. The only thing I can think of is that if you are punching it and going WOT around 3300RPM where your timing starts to suck, the ECU may be dumping too much fuel. Then it looks like the ECU might have time to adjust by the time you are up around 6K and you get good timing advance again. Next time you go for a 3rd gear pull, try to ease into the throttle more than just flooring it right away. You might see better timing advance. Both me and a friend had this problem on our 92s and if we eased into the throttle a little more, we got better results.

 

[cfisher]

yea i did pretty much punch it right at 3000K and all the way through 7k. Car pulls awesome from 5500 on but i'm still trying to get this lower 3000-5500K tuned right. From what i've read it is pretty common to get low timing right around when the turbo starts to spool but I'm still not sure.

 

[slice]

Did you try easing into the throttle while logging yet?

 

[Blk_99gst]

RPM TIMING O2 VOLT
2949 21 .92
3351 13 .93
3820 10 .95
4359 11 .98 ?? (timing bad but 02 good??)
4886 11 .98
5414 13 .98
5910 17 .98 (good timing and 02)
6367 17 .98
6738 18 .98
7074 20 .98

There's lots of threads about what 2g timing should do. When you punch it (at 3k rpm or wherever), the ecu freaks out with the new airflow. So it is typical for timing to get pulled down to the 8deg range. Then the ecu starts awarding more timing throughout the gear as long as it doesn't see knock. You want to end up with about 18deg-ish at the top of the gear. So yes, what you are seeing is perfectly normal. If anything your efforts have made things very/too rich. You can't trust o2's to tune by, but yours would suggest that you are quite rich. I usually shoot for about .94. Although I just got my wideband setup, so I won't be using the pocketlogger o2 voltages anymore.

 

[cfisher]

thats what i've found out so far too. it seems like all 2g's pull timing down to around 10 or so when the turbo starts to spool. my frank 2 starts spooling right around 4000K and really doesn't hit full boost untill about 4500rpm's but from then on it's a monster all the way to 7500rpm's. i'm gonna lean it out a little to get my o2's around .95 in the higher gears. so i'm pretty much stuck with low timing around the lower gears huh. i have a friend with a 91gsx and he has 18+ timing all the way through the rpm band. (HUH)

 

[CanadianTSi]

I wouldn't say you timing is low at all...looks pretty much normal, if not pretty darn good

But by looking at your o2's it looks like your on the rich side...lean it out some and see what happens.

 

[Violater101]

Yeah, seems perfectly normal to me. Anyway you can increase the sample rate to see whats going on between 5.4 and 5.9k? It seems to be okay, but you never know. I would keep leaning it out so long as your not knocking. The leaner you are, the more power your going to make. Typically .92V on a 2g is ideal, but you can't trust O2's to be highly accurate imo.

 

[cfisher]

thanks guys. i appreciate the advice and help. i leaned it out a little bit on my top end but have not had a chance to log it yet. i'll log it today and repost it on this site. i'm going to shoot for .92-.95 on the o2's and hope the timing stays the same.

 

[cfisher]

well it did the trick. took it to -35 on my highs from 4500 to 7000K and now i'm at .95 on my o2's with 18 deg of timing still and i definetly noticed more power in the top end. i'm really not going to worry about 3000-4000 and just leave it. i appreciate the help!