The Purple Camaro

[Bent77]

map 5029
406"
35 lb
58 psi

Running pressure 56psi at the highest
idle cruise runs about 51psi
on these MAPs 1psi = ~1% on fuel trim


So new settings

idle/cruise/accel
13.7/14/12.7

22 idle timing - 34 total by 3200 +10 vac adv

Fuel modifiers

idle -18
cruise -16
accel +12

pump 53%/30%


Still some lean on tip in, but it is adding fuel itself under tip in conditions, some times into the mid 20%
First time I've had it consistently add fuel under accel
into single digits at idle and cruise

Circling back on this as I never really got this update

Replacing the MAP was just the start. From there I dumped the learned data and started over
With the not so helpful help on the Edelbrock forum, I ignored what they were telling me and just started writing things down after each drive and working out some of the hard settings and then doing a full relearn

After a handful of times doing that and getting the global and AFR numbers really close on the first learn, I dumped everything again and then set the initial learn speed at SLOW for the first drive after clear, watching the velcro phone. I made 2-3 drives, one on slow, then one on fast, and another at slow before turning off the self learn settings

This allowed me to watch when the ECU started cutting fuel below 2000 rpm. What it's doing is picking up the overlap in the exhaust and trying to make it go away.
This was making the transition area on the map too lean on tip in and it wasn't able to catch up fast enough on tip in to compensate, thus a lean miss
If you rolled into it smooth or nailed the throttle, it would mostly be ok

Using different fuel maps was actually worse
On these drives I had 0/0 on the accel shot settings, then adding more in after the learn was off

This added back in whatever the ECU had trimmed out making it too lean.
I will still mess with this accel setting, but this is the beast the transition has been since I put the 406 in
the 350 had a 221/229 112 CL cam, where as the 406 is 231/236 110 CL (both at .050")

 

[folkenheath]

Circling back on this as I never really got this update

Replacing the MAP was just the start. From there I dumped the learned data and started over
With the not so helpful help on the Edelbrock forum, I ignored what they were telling me and just started writing things down after each drive and working out some of the hard settings and then doing a full relearn

After a handful of times doing that and getting the global and AFR numbers really close on the first learn, I dumped everything again and then set the initial learn speed at SLOW for the first drive after clear, watching the velcro phone. I made 2-3 drives, one on slow, then one on fast, and another at slow before turning off the self learn settings

This allowed me to watch when the ECU started cutting fuel below 2000 rpm. What it's doing is picking up the overlap in the exhaust and trying to make it go away.
This was making the transition area on the map too lean on tip in and it wasn't able to catch up fast enough on tip in to compensate, thus a lean miss
If you rolled into it smooth or nailed the throttle, it would mostly be ok

Using different fuel maps was actually worse
On these drives I had 0/0 on the accel shot settings, then adding more in after the learn was off

This added back in whatever the ECU had trimmed out making it too lean.
I will still mess with this accel setting, but this is the beast the transition has been since I put the 406 in
the 350 had a 221/229 112 CL cam, where as the 406 is 231/236 110 CL (both at .050")

From my experience I think this is something else. 231/236 is not that big of cam for the EFI. Also, typically with overlap there is extra oxygen from the intake mixed in that the ECU sees as lean from the O2 and it tries to add fuel, making it pig rich. You are saying you have the opposite problem, a lean miss.

If it was the overlap, the sure way to check is check the plugs. If the O2 says lean, and the plugs are black soot, you know it's a false reading.

The Edelbrock is not a true self learning deal, it has limits and you have to pick a base tune and it has to be within ~20% or you need a different tune. Whereas with true self learning the learn table could be 100% of the base table or more if you let it(this is a setting you can change in those). This is both good and bad, because it can never add so much fuel it it ruins the 02 sensor or smothers the engine, but it also has limits and I wonder if there are engines that are in between the tunes. Hopefully not I would think they would have overlap on the available tunes, Edelbrock is usually good quality and thorough on testing.

 

[Bent77]

Well, come on out and show me then
I’ve already replaced every single component off of the car with the one on the truck and proven that everything is actually working