BlackZ28629

iTrader: (8)

I ran and scanned once with nitrous and then without and I am getting KR from 1.2' to a whopping 4' between 3400-4300 then it cools down to 1.0-1.2 in upper RPMs. The only thing I have changed in the PCM is took out the tq management and Tq red. v shifts..and I added fuel in the PE table.(changed it from 1.250 to 1.375 (5% increase) from 3200RPM and up.) I ran it last night after changing it to 1.581 and got KR so I changed it to the 1.375 and it went away. Today I ran it again and it gets KR n/a..Im thinking it has something to do with the IAT temp? Help is needed. Please tell me what you think. Did I add fuel wrong? SHould I change it back to 1.250 and pull timing in the spark advance in the RPMs that are getting KR? Thanks!

jimmyblue

iTrader: (11)

1.25 is already pretty fat, too fat for NA by far unless you have
some tune errors (air or fuel side).

For your dry shot you wanted to see the Dynamic Cylinder Air
values, and figure out where thr dividing line is between NA max
CylAir and nitrous min CylAir, and anything above that you pull
timing out.

The nitrous hits before the MAF can report it so you are liable
to see a KR / lean spike. You have to cover that with some
extra padding (fuel) or take out additional timing. You look to
be overfueled (command side of it anyway).

Your KR probably persists a good while after the attack and
all you can determine after that, is if you get more (ratchet
up) or not (coast down).

If you don't have a wideband meter then look for your O2s to
read >900mV when spraying and up fuel if not. But this will
dog out your street tune. Definitely pull back the timing at
g/cyl levels above the max NA, take out 4 degrees and see
if you have KR. You already know you have it as it, and so
if it goes away you haven't left that much on the table by
pulling back on it. Also be sure your Knock Learn Factor is
not already showing a history of marginal timing, which will
unlearn and give you back KR later.

BlackZ28629

iTrader: (8)

so basically I need to change back to the 1.250 and run a scan again...then pull timing in the fields where N20 is applicable? It sucks not having wideband..the duty cycle on my injectors are 92% so the spray pattern is prob. not good and could be leaning out..Also, the mv are steady on both sides @ 900+ on the juice... @4283RPM the KR was at 3.9 20' advance..If I pull timing do I pull what the KR pulled at that RPM? The NA run, I got 3.9 at 3440RPM and steady 900s mv all the way through first gear. Last night I ran NA and had the same mvs but no KR at all. Im new to this and tryin to learn. Thanks for the help!!!

BlackZ28629

iTrader: (8)

I just changed it back to 1.250 and scanned it twice goin down the road 100%TPS no KR except a little spike of 0.9 during deceleration right after I let out of it @3400RPM which I guess is normal? I am gonna try some timing pulls tom. for the N20 and post info. Is there another place to add fuel that would work better for the N20? My goal is to have a good tune for both in one tune.

BlackZ28629

iTrader: (8)

scanned a couple n/a runs again and no KR but havent tried the spray yet. ANyone with any more info that could help is welcome to chime in.

Robert56

iTrader: (2)

You are likely running lean on the spray. Just because you raised the WOT PE multiplier does not mean your reading the spray at all. Air dynamics could, and do sometimes cause the spray to miss the MAF wires, so with out a WB you really are shooting in the dark. If you can log n/a and sprayed, as per my write up, you'll see instantly if the MAF is doing it's job while spraying. It could be a number of things, but again, you really need a WB, then it'll be easier to pin point the issue as we really are just guessing here.
Robert

BlackZ28629

iTrader: (8)

thanks for the advice...im gonna get one in the next couple of weeks...Ill get back with info to try to further investigate...