just installed safc II: boost levels?

[spectr019]

Okay so this past weekend I put in 550cc injectors, 190 pump (without the rewire...I know I know, but I'll probably get it done soon), and the S-AFC II. I've tuned the LO THR so that my STFT and LTFT equal out to 0, +/- ~7. I've also tuned the HG THR...this will DEFINETELY take a lot longer to tune for me, but I've leaned out the sections from around 3300-5200 at around -13% and -12% (used the baseline correction of -10%) for now, but once I take more logs and get some more free time I'll go much more indepth for the HG THR.

But okay so main question- right now I have the boost set at ~15 (i'm running on a fp big28 (unported...again, I know I know), and I only have a narrow band a/f gauge, not a wide-band). What will be safe boost levels for me to run at right now? Can I stay at the 15? Should I tune it more and THEN raise the levels? Can I raise the levels now to about 19? Any help on this matter would be greatly appreciated- I'm two days old at tuning Thanks yall

Ben

 

[GVR4592]

Do you have a datalogger?

 

[KeltonDSMer]

I assume he has a datalogger simply because he can see fuel trims.

Since this is a 2G, you must tune WOT using timing advance on a 2G when using a logger. I belive the fuel trims do not affect WOT fuel delivery or timing control.

I have never had a 2G, but I know that timing falls at the onset of boost and should slowly increse with RPM and peak at 15 or 16 degrees at redline and should also increase without sudden dips(knock).

 

[spectr019]

I assume he has a datalogger simply because he can see fuel trims.

Since this is a 2G, you must tune WOT using timing advance on a 2G when using a logger. I belive the fuel trims do not affect WOT fuel delivery or timing control.

I have never had a 2G, but I know that timing falls at the onset of boost and should slowly increse with RPM and peak at 15 or 16 degrees at redline and should also increase without sudden dips(knock).

Yes I have a datalogger and have made a few passes while using it. And yes, you're correct on that part, my timing drops significantly as soon as I go WOT and it slowly increases without any knock. One thing I'm kinda worried about is that on a set of instructions I printed out from a wiseman on the site, it said to try to keep the timing above 15-16 at WOT, which kinda just seems really really high to me at WOT...Should I really lean it out THAT much? What do you think I should aim for for the timing numbers? I guess I'll just slowly change the corrections and see how the datalogger says the car is responding to it. Thanks for the help

Ben

 

[GVR4592]

it said to try to keep the timing above 15-16 at WOT, which kinda just seems really really high to me at WOT...Should I really lean it out THAT much?

Getting the timing at 15-16 doesn't require you to lean anything out. That's just a recommendation based on the stock timing. If you aren't getting 15 degrees at wot, there's a good chance the engine is detonating and the ecu is pulling timing.

 

[spectr019]

Getting the timing at 15-16 doesn't require you to lean anything out. That's just a recommendation based on the stock timing. If you aren't getting 15 degrees at wot, there's a good chance the engine is detonating and the ecu is pulling timing.

oh well damn cause yeah I'm definetely below 15-16...I reach a timing of 7 at about 3500 (in third gear) right when I floor it, with an O2V of .97. Without showing you the whole log, at 4308 I'm finally at 1.00 O2v and 10 timing, so right there because especially of the O2v being 1.0+, I know that I'm really rich, right? To skip ahead a bit, at 5484 I'm still at 1.00 O2v, and NOW I'm at 15 for timing. 6072, still at 1.00 O2v, 28 timing.

I've read that the timing on a 2G should be 'nice and smooth.' Should it be smooth as in horizontal or as in a steady incline? And okay, so since my timing is getting that low, I can probably just lean it out little percentages at a time and see where that gets me?

 

[spyderturbo007]

Luke didn't mean that the timing needed to stay above 15 - 16 degrees throughout the entire run. That's what you want to shoot for at the top of the pull (higher rpm's). From your explanation of your log, it sounds like you are looking good.

It would be much easier if you could post a log. The timing should drop as you reach full boost and then have a nice consistent curve upward, ending above 15 degrees.

It also sounds like you are running rich. When you post up your log, please also include your Hi Throttle SAFC settings. Make a 3rd gear pull from 2.5k to redline, logging O2, timing, airflow and rpm. Please be careful when you are making the pull. We don't want anyone to get hurt

 

[spectr019]

hey well thanks for that response, that one cleared up my timing questions perfectly because I was getting worried that I was supposed to be keeping timing above 15 throughout the entire run. ...*whew* okay, well right on hand I have a quick run that I did yesturday. I didn't get too close to redline, which I change when I do another one, and I started out pretty high in the 3000 range, which I'll make much sooner on my next log. I'm going to make a bunch more today inbetween classes, but just to give ya an idea of how it's running, here ya go. Oh also, the lowest correction point that I have right now is -14% neara the 4500 area...Sorry I can't tell ya exactly without looking at the AFC...But yeah I can tell ya that that -14% is only for one point, and everything else is more positive. My baseline corrections were -10% (I'm running on 550s). Hope that helps. (I'm GUESSING that I cant bring the percentages down a bunch more since I've only STARTED tuning with it...but again that's just my guess)

RPM O2v Timing

(third gear)
3668 1.00 8
3808 .97 9
4000 .97 9
4140 1.00 9
4308 1.00 10
4472 1.00 10
4604 1.00 10
4776 1.00 11
4908 1.00 12
5064 1.00 12
5216 1.00 13
5332 1.00 14
5484 1.00 15
5604 1.00 16
5720 1.00 17
5852 1.00 17
5960 1.00 18
6072 1.00 28

(fourth gear)
4560 0.85 30
4576 1.00 11
4648 1.00 11
4708 1.00 11
4776 1.00 11
4852 1.00 11
4920 1.00 11
5000 1.00 12
5052 1.00 12
5120 1.00 12

I had to cut it short there because I was coming up on traffic on the highway and didn't have another opportunity to make a pull. But okay, I'm running pretty rich according to the O2v being above 1.00 the whole time, right? But the timing isn't too bad since it's gradually rising without any sudden dips showing knock? Well thanks a lot for checking that out. Again I'll try to make some more runs later on today.

Ben

 

[spyderturbo007]

I'll just comment on the first log, because the second one is so short.

It looks good, but I suspect that you are running really rich based on your correction factors and your O2 voltage. What boost are you running?

I would lean everything out about 3 or 4% and make another pull. Also, post up your Ne Points along with their corresponding correction factors when you get a chance.

 

[spectr019]

spyderturbo, just made another few passes while logging. Left the logger outside so I don't have it with me, but to brief it out for ya, my lowest correction point was -16% I believe, getting gradually more possitive up to -12% by 6500. On the logger, my O2v has dropped down to a constant .97 across the board. I had very very slight knock at one place before those adjustments, so my most recent settings should be pretty good and smooth now for timing. For the NE points, I have the factory set every 600 rpm. I'll get the logger later on tonight and record everything for ya to look at and see how it looks, but I think for now I'm gonna be about as lean as I can safely get. Oh, and I tuned it at 15psi, and I plan to raise it to about 18-19psi now.

Ben

 

[spyderturbo007]

Ben, based on what you are telling me, it still sounds like you are running rich and could raise the AFR a bit. You are still well below the baseline correction for the 550's. But we can make a better determination when you get your log up.

Also, with regards to the knock that you commented on, you have to be careful. There are other reasons that the ECU will pull timing so it might not be knock. If your IAT goes over 84 degrees or coolant temp goes over 206 degrees, you loose timing. Alternatively, the ECU could be dropping you into a lower timing map based on an increase in airflow.