Pocketlogger Readings. What do I need to do

[99GS-T Boost]

I made a couple of runs with the logger and my timing on the top end is horrible. It's down to 12 at 5800 rpms. The O2 is showing .92v. I don't know if that is too lean or too rich. Everywhere else on the band is is fine, getting around 20-30 with timing.

Any tips? If anybody wants more information, let me know. I need help. Boost was at 15psi. Stock injectors.

Thanks

 

[nine5raptor]

richen the top end. look at the logs to see where timing starts to fall off and start richening it there. move it slowly and see what it does (you are going the safe way-richer-so you don't have to worry too much).

 

[kpt4321]

First of all, with a 2g, and especially one with stock injectors, you shouldn't expect to have more than like 15-16 degrees of advance at redline.

Do you have a fuel computer?

The reason your timing is so bad could be one of two things. First of all, the ECU's timing tables are indexed by airflow, so the more air you are pulling in, the less timing advance you will get. Make ABSOLUTELY SURE you have no boost leaks, it DOES make a difference.

Second of all, if the ECU senses knock, it will retard timing. The primary way to fight knock is by adding more fuel, which is another possibility. However, since you are on stock injectors, you probably don't have much room to add fuel.

This is one of the reasons why people upgrade to bigger injectors; it allows them to decrease the airflow signal that the ECU "sees" in order to get more timing advance, while getting the same necessary amount of fuel flow.

I wrote up a tuning guide at http://www.racingknowledge.org/forum/topic.asp?TOPIC_ID=1011, it might be of some use to someone here.

Good luck!