Transient fuel GUFX

Decipha's custom GUFX strategy covers all 89-93 foxbody ecu's including the 88 mass-air california ecus.
PaulC-turbo5.0
Posts: 104
Joined: 2021 Feb 15, 21:56
Location: Lancaster New York
Vehicle Information: 1989 fox GT convertible
5.0 stock block, E7 heads, stock cam
Explorer GT40 intake flipped to driver side inlet
Single 67mm On3 BB turbo
Flipped JBA headers, custom SS 2.5" hotside built by me
custom 3" coldside thru On3 intercooler
tuning with Moates QH + TPRT
Dechipa's GUFX and supporting files, couldnt have tuned it myself without him!

Transient fuel GUFX

Unread post by PaulC-turbo5.0 »

I am having the exact same symptoms as Dleach but to avoid potentially highjacking his thread any more and considering we use different strats I thought I should start one. viewtopic.php?f=6&t=190

Main issue is going rich when shifting and then lean coming back out of the shift which can cause some hesitation, only when cold. I have also just realized that is does this all the time, OL, CL, and even when up to temp but its not noticeable much at this point. If I'm at a steady cruise and slowly push in the throttle it will climb lean a touch before back to stoich, 1.10 or so. If I do a more aggressive throttle stab it will go a touch rich then come back to lean before getting back to stoich, .9 to 1.10 then back.

I will list below the things I have adjusted in the tune to try to remedy this.
AEM is set to max at 2
Transient accel multiplier is also maxed at 2
Transient decel multiplier is set to 1
Accel enrichment entire table is doubled, if I try to go anymore the car doesnt like it and bucks on a quick throttle stab.
Manifold volume for fast fill and slow fill are both set to 1 which seems to be the max
After being confused at times I am now confident my fuel is well dialed in.

I am looking for suggestions on what else I can try to get this remedied?
decipha
Posts: 4953
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Transient fuel GUFX

Unread post by decipha »

if you have to max out accel enrichment then you probably have bad injectors.

What injectors do you have and where did you get them from?
PaulC-turbo5.0
Posts: 104
Joined: 2021 Feb 15, 21:56
Location: Lancaster New York
Vehicle Information: 1989 fox GT convertible
5.0 stock block, E7 heads, stock cam
Explorer GT40 intake flipped to driver side inlet
Single 67mm On3 BB turbo
Flipped JBA headers, custom SS 2.5" hotside built by me
custom 3" coldside thru On3 intercooler
tuning with Moates QH + TPRT
Dechipa's GUFX and supporting files, couldnt have tuned it myself without him!

Re: Transient fuel GUFX

Unread post by PaulC-turbo5.0 »

Siemen deka 60’s from PAS
decipha
Posts: 4953
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Transient fuel GUFX

Unread post by decipha »

well its not that. Post a short log and the tune file.
PaulC-turbo5.0
Posts: 104
Joined: 2021 Feb 15, 21:56
Location: Lancaster New York
Vehicle Information: 1989 fox GT convertible
5.0 stock block, E7 heads, stock cam
Explorer GT40 intake flipped to driver side inlet
Single 67mm On3 BB turbo
Flipped JBA headers, custom SS 2.5" hotside built by me
custom 3" coldside thru On3 intercooler
tuning with Moates QH + TPRT
Dechipa's GUFX and supporting files, couldnt have tuned it myself without him!

Re: Transient fuel GUFX

Unread post by PaulC-turbo5.0 »

cool thanks for looking. car wasnt completely cool from the ride to work but I did the first log as soon as im pulling out so not up to temp and in OL. Then I did another after she was warmed up.
OL transient issue 5-24-21.xdl
(20.31 KiB) Downloaded 215 times
CL transient issue 5-24-21.xdl
(24.45 KiB) Downloaded 229 times
paulc - 05-24-21.bin
(56 KiB) Downloaded 249 times
decipha
Posts: 4953
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Transient fuel GUFX

Unread post by decipha »

You have far too much acceleration enrichment fuel which is making up base fuel. You need more transient fuel.

Your kams are jumping around quite a bit too.

Get the maf dialed in and then focus on dialing in the transient fuel table fn1321.
Attachments
paulc - 05-24-21-B.bin
(56 KiB) Downloaded 215 times
PaulC-turbo5.0
Posts: 104
Joined: 2021 Feb 15, 21:56
Location: Lancaster New York
Vehicle Information: 1989 fox GT convertible
5.0 stock block, E7 heads, stock cam
Explorer GT40 intake flipped to driver side inlet
Single 67mm On3 BB turbo
Flipped JBA headers, custom SS 2.5" hotside built by me
custom 3" coldside thru On3 intercooler
tuning with Moates QH + TPRT
Dechipa's GUFX and supporting files, couldnt have tuned it myself without him!

Re: Transient fuel GUFX

Unread post by PaulC-turbo5.0 »

ok I'll give this a shot. I read here before that accel enrichment is used for quick throttle movements and transient fuel was for changing loads without throttle movement so thats why I only focused on accel.

can you give any quick pointers on how to dial in the fn1321 table? I assume I'll want to increase the numbers to add in more fuel? is this a table you want to try bigger changes like multiplying by say 1.5 or just smaller increases?

also considering I need more transient fuel why did you set the multiplier back to 1.5 instead of leaving that at 2?
decipha
Posts: 4953
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Transient fuel GUFX

Unread post by decipha »

because i kicked up the table

yeah don't be afraid to make big changes
PaulC-turbo5.0
Posts: 104
Joined: 2021 Feb 15, 21:56
Location: Lancaster New York
Vehicle Information: 1989 fox GT convertible
5.0 stock block, E7 heads, stock cam
Explorer GT40 intake flipped to driver side inlet
Single 67mm On3 BB turbo
Flipped JBA headers, custom SS 2.5" hotside built by me
custom 3" coldside thru On3 intercooler
tuning with Moates QH + TPRT
Dechipa's GUFX and supporting files, couldnt have tuned it myself without him!

Re: Transient fuel GUFX

Unread post by PaulC-turbo5.0 »

Ok I do now see where you changed that table. I am not sure if you worked some other magic in there somewhere that I havent noticed yet but so far the issues I was having are completely gone! If not it seems like a fluke because I know I have tried the A9L2 transient settings, its what I started with.

One thing I did think was odd is after loading the latest tune I had to open my throttle stop a bit?

Also like you mentioned my maf transfer needed adjusting but as usual its still fucking with me?! Driving it for a while yesterday after loading the tune it was adding a bunch of fuel, up to 10% in some spots. I worked it for a while dialing it in. Well to no surprise this morning driving in to work its pulling that much fuel?! I stopped shut the car off and loaded in the old maf transfer and the damn thing was still pulling fuel after. I'll keep plugging away at it and see what happens. Still really happy the other issues are gone though so THANKS!

I did notice you had the KAM clear patch turned on so it's clearing KAMs every time I shut it down. Should I leave it like that for now or remove that patch?
decipha
Posts: 4953
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Transient fuel GUFX

Unread post by decipha »

yeah leave it like that til you get it dialed in to make life easier

hence why i created that kam clear patch to only clear kams on engine shut offs as it makes life much easier
Post Reply