Stomp Fuelling

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September 29th, 2021
Rick_Abraham

Stomp Fuelling

Hi guys,
I own a 1992 Holden VP Commodore which has a Holden 5.0L V8 in it, the engine use to be controlled by a Delco 808 ECM, I have changed this to a P01 LS1 PCM.
The engine has been tuned using EFI Live and I am really happy with the tune other than a small issue when I stomp the accelerator pedal from a dead stop.
A majority of the time when I do this I see a lean mixture for a second (17:1) and it pops and backfires in the exhaust before the engine comes to life and takes off.
I have heard a few people speaking about dynamic fuelling.
Can someone point me in the right direction on what tables I can play with to try and eliminate this problem.
Its like the engine needs a little more fuel just on stomp to get the engine up and going.

On occasions when I stomp the accelerator pedal the engine will backfire in the exhaust and sometimes stall the engine.

I haven't tried it yet but I was going to increase the number on B3426 STOMP COMPENSATION to give me a little more fuel on tip in.
Do you think this is a good move ??

Any help would be greatly appreciated.
Regards Rick
September 30th, 2021
ScarabEpic22

Post your tune file and a log. Have you fully dialed in your VE table and set PE correctly?
October 9th, 2021
Rick_Abraham

1 Attachment(s)

Attachment 23947

Hi,
VE table is dialed in spot on, once the car gets going its a rocket with no issues, just that initial stomp of the accelerator that is causing problems.
Here is the tune file.
October 11th, 2021
ScarabEpic22

A0007 isn't fully populated for me.
B3610-3613 have some values I'd call interesting for a boosted car.

B3643-3645 may help as well, helps control how fast the PE fuel is actually ramped in once PE mode is active.

The table you called out (B3426 Stomp Compensation) may help you as well, likely it'll be some fine tuning of all of these to get it sorted out.

Happen to have a log of when the issue occurs? May help us narrow down where to start making changes.
October 11th, 2021
Rick_Abraham

Thanks ScarabEpic22 for the info.
I ended up giving the B3426 Stomp Compensation table an additional 13% of fuel and the problem seems to have gone.
October 12th, 2021
ScarabEpic22

Quote:

Originally Posted by Rick_Abraham

Thanks ScarabEpic22 for the info.
I ended up giving the B3426 Stomp Compensation table an additional 13% of fuel and the problem seems to have gone.

Glad to hear it!
October 20th, 2021
joecar

What intake manifold are you using...?