Afterstart Enrichment Table Question 
Afterstart Enrichment Table Question
that table is pretty straight forward if your olfa table is set to 1.00 and you have a .25 in your After start enrichment table at that ect your final afr is be 1.25 or 11.75 upon startup.
So it does add to the OLFA table, interesting.
Say my coolant temp is 68 degrees F and after I first start the car the MAP goes to 40kpa and my OLFA value is 1.10, the Afterstart Enrichment table will ADD .250 to the OLFA value, correct?
So if that is true then 1.10 + .250 = 1.350
1.350 would equal a 10.88 A/F!
No wonder why I have black "water" coming out of my tail pipes onto my driveway on a cold start.... That would also explain why my wideband LM-1 reads "Too Rich" on a start up for the first 5-10 seconds...
Bill
Say my coolant temp is 68 degrees F and after I first start the car the MAP goes to 40kpa and my OLFA value is 1.10, the Afterstart Enrichment table will ADD .250 to the OLFA value, correct?
So if that is true then 1.10 + .250 = 1.350
1.350 would equal a 10.88 A/F!
No wonder why I have black "water" coming out of my tail pipes onto my driveway on a cold start.... That would also explain why my wideband LM-1 reads "Too Rich" on a start up for the first 5-10 seconds...
Bill
There is another table that determines how long it kicks in for. I've left the adder alone to be sure it fires, but shorten the length of the enrichment period where there is a hump in the table.
This looks like the table your talking about, but it can't be in RPM's, it has to be something else because 100 RPM's would be over in milliseconds after start up:
What do these other tables do:
What do these other tables do:
the are time and rate tables. I didnt feel like fooling around with em to much so i just messed with that added table actually i 0'd it out form 3* on up to 284 and it cured hot start problems also and surging when first cranked
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FormerVendor
Joined: Jan 2003
Posts: 525
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From: Melbourne, Australia
it works like this:
1. the two initial adders are summed and form the start point for the enrichment. This value adds to the openloop eq.
2. there is a "decay delay" which is how long the initail adder is held before it begins it's decay to zero. the delay is in engine revolutions.
3. the "Decay Step" and "Decay Mult" determine the rate of decay to zero.
This is basically an "automatic choke" function.
Chris...
1. the two initial adders are summed and form the start point for the enrichment. This value adds to the openloop eq.
2. there is a "decay delay" which is how long the initail adder is held before it begins it's decay to zero. the delay is in engine revolutions.
3. the "Decay Step" and "Decay Mult" determine the rate of decay to zero.
This is basically an "automatic choke" function.
Chris...
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i used the adder from the 2002 bins, made it decay faster and set the OLFA to 1.00 then worked with the friction airflow to keep the rpms from hanging on start up. saves a lot of gas on start up and still fires fine.
Originally Posted by WS6FirebirdTA00
i used the adder from the 2002 bins, made it decay faster and set the OLFA to 1.00 then worked with the friction airflow to keep the rpms from hanging on start up. saves a lot of gas on start up and still fires fine.
post a few of the tables that you have changed, I'd like to see them.
Originally Posted by Billiumss
This looks like the table your talking about, but it can't be in RPM's, it has to be something else because 100 RPM's would be over in milliseconds after start up:
Interesting you guys bring this up, as I ran the autotap on my Hawk last weekend, and couldn't isolate on why my car "on cold starts" will surge for about 30 secs between 400 -750 rpms and then idle right out at 750-800 rpms.
Now I did recently install a ported TB, but this problem began about 2 months after install, and we cannot determine why.
Any guesses?
Now I did recently install a ported TB, but this problem began about 2 months after install, and we cannot determine why.
Any guesses?
if its surging its got to do with fueling, did you close the iac hole with epoxy at all? maybe you arent getting enough air (but that would more or less cause a low idle).
Originally Posted by WS6FirebirdTA00
if its surging its got to do with fueling, did you close the iac hole with epoxy at all? maybe you arent getting enough air (but that would more or less cause a low idle).
Thanks for the response.....just fricked weird, but I guess a full blown tune will catch this when I get the cam installed next year. Meanwhile, I will just have to deal with the problem I guess. No harm, no foul!