Timing Help Please!

[hottboost]

My mods are in profile, except I havent did the 550's or SAFC yet!! I have logged runs from 14PSI to 18PSI and it will pull timing around 3200 rpms to 4-5 degrees! The only difference is o2's will stay around 0.94-0.95 at 18psi where they are around 0.96-0.97 at 14PSI! Is this a lost cause untill I get the injectors and safc in to where I can tune it. Its still going to be a few weeks. I have did a complete tune up... plugs wires filters, engine and coolant flush. Thanks in advance.

 

[andymoraitis]

Please post a log so we can have a better look. In the meantime, you may simply being outflowing the injectors with the T28 at theose boost levels. Try running 12-13 psi and attach a log of that as well.

 

[hottboost]

2500 To Redline In 3rd Gear. How Do These Look? This one was at 18psi. I dont have my car or logger with me at this time but the 14 psi pull was very similar timing but the o2's were at 0.97! So you think I should try to log one at 12PSI?? I was thinking that but thought that I would run rich with the 190LPH

Timing O2 Rpms

13 0.91 2516
10 0.93 2648
09 0.93 2796
07 0.93 2932
06 0.95 3104
04 0.95 3288
04 0.95 3492
05 0.95 3700
06 0.95 3904
07 0.95 4096
08 0.95 4256
08 0.95 4484
08 0.95 4660
09 0.95 4828
10 0.95 4984
11 0.95 5144
11 0.95 5316
12 0.95 5468
13 0.95 5620
13 0.95 5756
14 0.95 5916
16 0.95 6044
16 0.95 6180
17 0.95 6284
17 0.95 6400
17 0.95 6516
17 0.95 6596
17 0.95 6688
18 0.95 6784
18 0.95 6856

 

[andymoraitis]

There's not much wrong with that log. I know the O2's show rich in the midrange, but narrowband can be unreliable. You have a small timing dip from 2400-3200 and the O2's show a bit lean. The timing up top looks excellent and once she hits 3200 and up, it's a nice steady curve. When you add the AFC and injectors, re-log it and re-check the midrange. Otherwise it looks great, especially on the top end.

 

[hottboost]

So it is natural to pull down to like 4-5 degrees at 3200-3400rpms. I still learning when it comes to the tuning and logging side. Also my coolant temps were 213 F at WOT and egts were 800 c. The EGT PROBE is in the o2housing on the top bend. Thanks for the help

 

[andymoraitis]

Whenever you mash the throttle, timing automatically dips down as the ECU changes it's loop mode. That's why when crusing in 5th, timing is so high and why it drops substantially and then builds to redline if you go WOT. if you had serious dips in your timing as the revs were increasing, that would indicate knock and a lean condition.

I think you're fine and it's running well if you can build that much timing to redline without knocking. Coolant temps are also pretty good and your EGT's are in range.

Enjoy it!

Andy