Going rich then lean when shifting

[dleach1407]

I think ive got air_manifold_volume dialed in at 4.5. when i goose the throttle, It stays pretty much around 14.7 but I am still getting the lean spike after i roll into the throttle to accelerate after i let out the clutch. Its really a quick blip and when fully warm, it isnt really noticeable while driving however I know it shouldnt be dropping to 20:1. I have maxxed out accel time constant which appears to have a maximum value of 7.98. I tried reducing and increasing the decel time constant which didnt seem to make much of a difference. Thoughts?

[decipha]

where did you get your injectors from ?

[dleach1407]

Power Adder solutions. I deal with them exclusively for injectors.

[dleach1407]

Should I maybe do a datalog for you to look at? Maybe the way im describing is making it hard to diagnose.

[decipha]

unlikely i'll be able to look at it anytime soon bunch going on still got over a week of premium member updates backlogged

[dleach1407]

At this point, I dont know what else to do. This is the only issue I have left other than dialing in dashpot which im going to start on next. If I have to do a log and wait for a few weeks or more for you to have time to look at it, i guess all I can do is wait.

I just dont know what else to try. Do you have any other recommendations?

I feel air_mainifold_volume is just about right but im still getting a lean spike after tip in. I was trying to find significant differences in the transient fuel settings vs the most recent .bin and I am finding significant differences in a few of the transient fuel settings. I will list a few examples.

MTEISF (Tip in modifier) default is .188, mine is set to .062
fn1052 is unchanged

FN312qd default is
65534 0.7987022
200 0.7987022
100 1.0013580
76 49.9993563
20 99.9987125
0 150.0010490
-20 174.9992371
-65536 174.9992371

Mine is set as
65534 1.1026859
210 1.1026859
110 6.5982342
84 68.7479973
22 137.4989748
0 181.5021038
-22 192.4991608
-65536 192.4991608

Accel and Decel constant times are completely different too.
Should I maybe copy over certain default settings from the most recent .bin? When I compare the settings to the old .bin (2020)to the new bin, These are significantly different from each other.

[PaulC-turbo5.0]

I would recommend either trying that or better yet start fresh with Deciphas latest tune altogether. I was fighting with this similar issue for a real long time as well and going back to Deciphas transient settings and then doubling the entire fn1362 table has worked wonders for me. At least starting fresh with the new K constant setup you wont have any scaled values anymore that could be adding confusion

[dleach1407]

Well, i copied all of the transient fuel settings over from the latest T4M2.bin and things are better for sure. When cold, i didnt notice any lean spike and driving felt normal. Now I only see the lean spike when i really stab the throttle between high rpm/shifts. Im seeing it drop to 20:1 and recover super fast but when i do normal shifting or regular driving, Im not really seeing a much of a lean spike. It might drop into the 16s. Before it seemed to always drop into the 20s regardless if it was normal or hard driving. Should i get back to playing with the manifold volume again? Also to confirm I should add 10% over base settings to the tip in transient fuel. Thoughts?

[dleach1407]

I would recommend either trying that or better yet start fresh with Deciphas latest tune altogether. I was fighting with this similar issue for a real long time as well and going back to Deciphas transient settings and then doubling the entire fn1362 table has worked wonders for me. At least starting fresh with the new K constant setup you wont have any scaled values anymore that could be adding confusion

I have done a compare between the 2 files and adjusted most of the differences. The K-constant is configured in my tune and I am using the 80lb injector patch. There isnt much different between the 2 tunes now.

[decipha]

go cut your manifold volume in half should enrich her nicely on tip in