Need advice with tuning settings w/550's

[FWD98GST]

I did some logging last night and this is what I came up with... I did some experimenting with some settings on the AFC and also took in consideration of some settings that were displayed on RRE website...

My question is.. Is 15 degrees of timing a good indication towards the end of a 3rd gear pull? As I search upon the forum, I see that people consider of having a degree of timing of 18 to 22 degrees.. I see that I'm far off what people consider good...

Hi throttle settings: 1k= -22% 2k= -22% 3k= -22% 4k= -22% 5k= -22 5.5k= -22% 6k= -21% 7k= -20%

Here are my datalog for that setting:
RPM Timing 02v
3914.0 8.0 0.92
4168.0 8.0 0.9
4441.0 9.0 0.92
4707.0 9.0 0.92
4910.0 9.0 0.92
5168.0 10.0 0.92
5363.0 11.0 0.92
5559.0 10.0 0.92
5766.0 11.0 0.94
5938.0 12.0 0.94
6133.0 14.0 0.94
6281.0 14.0 0.94
6449.0 15.0 0.94

[spyderturbo007]

There are a couple of things that I see that may help.

1st.....You don't seem to have very many data points. How many samples/second are you getting?

2nd....You are starting the log too late, right around the point of highest VE. It is better to start at 2500 - 3000rpm's.

3rd....Looking at your O2 (which isn't really worth much on a narrowband sensor) and your SAFC-II setting, I would say you are running a little lean which is causing some knock. 550's are 18% bigger than your stock fuel injectors so you should be somewhere around -18 on the SAFC when you get it tuned.

See if you can increase the samples/second on the logger....start the log a little earlier and check out this site. It has an excellent tuning guide.

Enjoy!

http://www.racingknowledge.org/topic.asp?TOPIC_ID=1011

[CyberEye]

Originally Posted by spyderturbo007

550's are 18% bigger than your stock fuel injectors so you should be somewhere around -18 on the SAFC when you get it tuned.

I'm running 550's and a 190lph pump, yet in order to get my fuel trims close to 0 (ltft + stft) I'm at -29% @1k, -25%@2k and -25%@3k, this is in low throttle settings. I can't figure out whats up.

[dugjr24]

I agree you are getting some knock around 5K so add a percent or two. On the other hand to get the timing that you are shooting for I would lean out another 1-2 percent at the 6K and 7K range. That should give you a couple more degrees of timing.

[DSMTalonAWD51]

leaning it out even more is not going to give you more timing if you are already knocking.
I would richen it up 1 or 2 percent after 5k rpms and see if that helps the dips in your timing. As long as it continues to rise toward redline with no dips you are in good shape. Who cares if you only get 16 degrees by redline and not 22. The ecu was designed to raise it to only 16 and with lower timing you can rasie the boost higher on pump gas without knocking.

boost>timing