Wideband rich, pulled timing, log inside.

[jlado13]

I just started logging and tuning 2 days ago, and I'm new, and stumped. I run pocketlogger. My problem is my timing seems to be getting pulled in certain areas. My wideband always reads rich under WOT. I'm running 13psi and when I peg the throttle, the wideband starts out between 12-13 afr's and then as boost and rpm's climb, the afr's begin dropping to 11's. Boost leak? I have attached a log from this afternoon in 3rd gear. I'm confused why I'm losing timing.. Thanks in advance. Also, I have a way leaner idle than I did yesterday morning. It was 14-15ish, and now it's 16's and 17's.. Fuel pressure is stock level and all my mods are up to date.

RPM TIMING 02V
2004 17 .88
2273 19 .88
2418 17 .90
2563 19 .86
2738 18 .86
2930 16 .88
3125 13 .88
3328 13 .86
3547 14 .86
3750 15 .86
3988 15 .88
4207 12 .90
4387 12 .90
4613 13 .96
4805 14 .96
5000 13 .96
5227 15 .96
5402 16 .98
5637 16 .98
5781 18 .86

 

[spyderturbo007]

My wideband always reads rich under WOT. I'm running 13psi and when I peg the throttle, the wideband starts out between 12-13 afr's and then as boost and rpm's climb, the afr's begin dropping to 11's.

Just so you know, 11:1 really isn't lean. Most guys shoot for an AFR of 11:1 which is where DSM's seem to like their AFR's. The stock ECU AFR target is 9.5:1 on the highest airflow map, just for reference.

 

[jlado13]

I understand. I was under the impression you were supposed to tune somewhere leaner than that. However, I stumbled across a post by you mentioning the 11:1 afr with the ecu trying to keep a 9.5:1 last night. I added some fuel in the mid range last night, and it definitely helped my timing. Once I hit full boost, my timing starts at about 10-11* then steadily climbs to about 19*

I know timing initially retards once you go WOT, but is it supposed to keep retarding until you hit "full boost"? Then once full boost is reached it begins advancing? Reason I ask is because my timing will retard when I go WOT at 2k rpm, and won't start advancing until about 3-3.3k rpm.

Also, one last question while I'm in here... Do any of you guys know at what intake air temperature the ecu will retard 1* of timing?

Thanks.

 

[turboglenn]

Look at the RPM range, EVERY DSM i've seen seems to knock starting right below 4500 and not letting up till after 5k. MIne's doing the same thing right now, with an expensive ass stand alone knock detection system and a full stand alone to tune on. and nothing is taking it away now...I started running alcohol/water injection and at first everything was fine... I just swapped my tranny and went to finish my tune and then it started happening just like the factory ECU use to do 10 years ago, when i was just on it with an SAFC, logger, b16g, FMIC and 550 injectors (and supporting mods of course)

Sorry i don't have any help, i just see this trend of 4g63's knocking in that rpm range so often it's disturbing, hell, my turbo is just hitting full boost at 4200 and im getting it, the thing hasn't even started produing heat yet

 

[spyderturbo007]

I understand. I was under the impression you were supposed to tune somewhere leaner than that. However, I stumbled across a post by you mentioning the 11:1 afr with the ecu trying to keep a 9.5:1 last night. I added some fuel in the mid range last night, and it definitely helped my timing. Once I hit full boost, my timing starts at about 10-11* then steadily climbs to about 19*

That's exactly what you are looking for, an initial timing drop and then a smooth advance all the way to redline. You might see a one degree drop at certain points, but normally you're getting bumped into a higher airflow map which corresponds to a lower timing map. This is something that we can verify by looking at the ECU's timing / airflow maps.

I know timing initially retards once you go WOT, but is it supposed to keep retarding until you hit "full boost"? Then once full boost is reached it begins advancing? Reason I ask is because my timing will retard when I go WOT at 2k rpm, and won't start advancing until about 3-3.3k rpm.

Yep, you hit the nail on the head.

Also, one last question while I'm in here... Do any of you guys know at what intake air temperature the ecu will retard 1* of timing?

Thanks.

IAT > 84 degrees. Also, coolant temp >210 and you loose another degree.

 

[jlado13]

Cool, thanks. Now I just have to fix my boost leak behind the throttle body.. I can't find it... gayness.