Hi guys,

I am currently running 14 - 15 psi (no meth). Here are some pics from HP Tuners.









I think this is pretty safe but I'm sure I can get some more out of it. How would you guys go about tuning it for max power whilst still being safe?
Keep in mind that I will be running meth too. It's already installed but didn't want to to try tuning it before I got some advice.

Basically, I want to run 18 - 20 psi with meth. How safe would that be? And how should I proceed with tuning.

Thanks a mill

 

The one screen shot still looks like you were seeing knock under boost, so it might not be safe with the timing you were running. Seems to knock and go away as the rpm's got higher so dropping timing by 1-2 degree's might be needed.


I think through some stuff I've read is that say you were at the track or on a dyno, you could add boost or timing untill you see your MPH drop off or it starts to knock and not pick up large hp gains. Say it was 10-15 hp per lbs of boost or timing jump but then levels off to only 1-5hp per lbs or timing bump. Then once you reach the limit you back it off by a few degrees of timing or boost to know it's going to be safe.

 

You are right! So basically I should decrease timing at the RPMs I'm seeing knock at?

 

Only if its real knock, may not be, could just be the sensors hear something they think is knock. Best way to know is to put some good gas (C16, 110, etc.) in there and see if it still pops up.

You still need to tune the maf curve a little bit, you are leaner than commanded up top.

More timing will make more power, unless it knocks. Its generally easier to make more power with boost than it is with timing.

Also I would hook up your narrowband sensors so you can keep an eye on the banks with something other than just the wideband.

 

I just installed the alky meth kit so I'm going to be tuning for that. I heard turbo sierras and silverados are notorious for false knock. Also, do you mean the MAF Airflow vs Frequency table?

 

Yep, that table is what tells the computer how much air you are getting based on what frequency the sensor is measuring.

 

I added 1 degree of timing between 4200 and 6000 just to test things out after which I logged and got 0 knock thankfully. The meth dropped the AFR down to a minimum of 9.49 (10.1 - 10.3 in other areas). What should I do now? Keep tuning the MAF and try to reach 0 with an accuracy of +/- 3?

I'm new to tuning but would love to learn.

Btw IAT was at 63 and 67 degrees and it's 90 degrees out today.

 

I believe with meth you want to command 12.0 afr at WOT.

 

Or add some fuel. Given your duty cycle, it looks like your injectors can handle it. I'd try that before I'd pull timing. You'll be giving up ground otherwise.

 

That's actually a good idea. However, there is zero knock with the meth now. I'll do this for the no meth tune.