Ive been doing calc.vet and have come across a few questions...
for reference, this is a stock cubic inch ls1, trickflow 215 cnc heads, vengeance vrx5 camshaft (236/238 .601/,605 113 LSA), vengeance ported FAST90 intake/90mm TB combo, SLP lid, stock 78mm MAF-descreened, kooks 1 7/8 LT headers and 3" Y pipe fitted down to the stock Z28 muffler. I'm also running at roughly 3300 ish elevation.
1. What impact on tuning is the descreened MAF creating?
2. I'm also running a cutout between the stock exhaust and the kooks Y pipe and tuning with it closed. my logic is that the reduction in restriction with it open will cause a leaner condition but will still follow the same basic VE table form, so I may want to set WOT AFR at something slightly rich like 12.5:1 (and obviously double check open cutout AFR values once I have a smooth AFR reading under WOT). am I thinking correctly here?
2. my LTFT have been reset a couple times and thus far the LTFT avg pid logs -1.6 and -2.3. What would cause one bank to have nearly double the LTFT correction percentage? is this normal or should I be looking for a collapsed lifter etc... creating an unequal airflow?
3. My VE map corrections are creating a handful of spikes.. this is an example.
Map before:
Map After :
Is this normal and/or what actions cause these? i.e. blipping the throttle, etc.
4. Ive only primarily corrected/logged light throttle cruising, interstate driving, essentially avoiding PE mode due to an overly rich condition as I have killed one wideband sensor due to a 9:1 initial WOT AFR. this is why the map above shows an incomplete under 70 kpa, above 3000 portion of the map. I did do a few 100% full rpm range corrections with the old sensor before it went kaput and have gotten the AFR to run in the 12's up to about 4800 rpm, where it drops into the 11.5-12.0 range up to 6800.
If I find the maf frequency where it starts to drop into the 11's and decrease the g/s airflow above that point by a percentage or two then blending, am I thinking correctly in terms of how to address this? Joecar, you have answered this on another thread for me.. I wanted to make sure I'm understanding what I'm doing rather than follow without understanding.
Further, Am I correct in thinking also that since the ve table is disabled per the tutorial above 400 rpm that the computer is running entirely by MAF frequency at WOT right now and then also by fuel trims via narrowband o2 in non-pe enriched mode? Meaning I can manually get WOT in the 12.5ish ballpark through manual MAF correction then let selben fine tune it?
Lastly, I'm to the point where the cruising / light throttle portion of the map is doing nothing but creating a moderately cratered surface on the map that I then go smooth out. the area I'm talking about is in the second above photo in the below 65 kpa/ below 3500 range. at this point, how do I know when i'm essentially done tuning that part?
Thank you in advance for any help on these!