Ultra rich as engine decels

[dleach1407]

Im making decent progress on this and I am finding that when warm, I pretty much have it dialed in. The problem I am having is that my tip out and tip in when cold do not seem to be in relation to each other. So when the car is cold (less than 150) my transient settings seem really close during and after tip in but tip out, its almost as if DFSO is kicking in. The logs do not show its going into dfso but my wideband shows 1.52 lambda as it decels but as soon as I press the gas, the AFR jumps up to fairly normal (1.04 lambda). I was thinking this might have to do with 1323A or 1323D? Thoughts

[decipha]

yeah dfso obviously has to be disabled in order to dial in transients

decel is based on actual intake surface fuel being greater than the calculated puddle mass (eisf)

eisf is the transient puddle size == FN1321 * FN313 * MTEISF

perload isn't used for transients actual load is

if it goes rich on decel then it needs more transient fuel to remove more fuel

if it goes lean 2-3 seconds after a shift thats not transients as transients is usually only half a second after load changes

fn1052 the manifold volume multiplier table has ACT at the x axis along the top and the rows are ECT along the side axis
The stock table is actually pretty shitty the way its setup as its not ideal. I've always just dealt with it though.

Best bet if its just cold transients your trying to adjust is to go adjust the decel time constant table. Go swing it around and see if you can
get her to respond and stay more consistent.

[PaulC-turbo5.0]

Glad to see your making some progress.

Going off of memory(last year), since the weather here in NY has continued to be shit so the car hasnt even left the driveway yet this year, after my transient settings were reset by Decipha what you decribe is exactly how my car acts. It was definitely weird at first and took some getting used to but once I did I actually liked it. I didnt touch transients after that I was happy enough not having the crazy swings to cause bucking when cold.

Take this for what its worth, I see the man has responded with something much more in depth while I was typing lol

[dleach1407]

Im going to try doing the revving thing this weekend hoping to target 40-60% load areas for each temp range from 60 to 210 and then try to interpolate the numbers for above and below the load areas that I hit while logging. Its getting closer dialing it in from data logs but I feel the revving will work better so Im not experiencing the swings while shifting. I went ahead and set WOT breakpoint to 1024 AD counts, set FN320A and FN337 to 20 seconds to force CL at WOT. I didnt mess with timing since I dont plan on driving it hard while dialing these in.

And to clarify, the going lean and rich isnt happening 2 seconds after i press/release the throttle. It happens right after pressing and/or releasing the throttle. based on logs its less than .5 seconds Im pretty confident its the transient settings. The changes I am making are helping.

[red5.0fogger]

how about accelerator pump settings?

[decipha]

thats manifold volume

[dleach1407]

what is manifold volume? The problem I am having? ive tried playing with manifold volume for 3 years now.... changing air_man_volume does not fix the problem.

[decipha]

that was a reaponse to the post above it

[dleach1407]

Thats what i thought. yeah, i have air_man_volume dialed in pretty close as far as i can tell. If i move it in either direction a little bit, i get lean or rich spikes on tip in. Right now, it seems tip in is fine, its when the transient is supposed to be adding or removing fuel is when i am running into issues from what i can see. If I cant make significant progress this weekend I will post up my tune and a data log of me reving and holding from cold to warm.

[dleach1407]

I dont see how the revving thing will work. I just did a datalong from 70 degrees to 150 degrees trying to do the rev and hold method. When i stab and hold the throttle, i get an initial jump in load to around 50% then the load immediately drops as the rpms come up because the engine isnt actually under load, within a second I am at 20%. There is no way to hold the load consistent long enough for the ecu to react. Im still in tip in enrichment when the load is already coming back down.