The Accel Enrich Base vs Engine Temp table has settings vastly different from my 94170015....I am curious as to why.

94170015
248 222 200 171 137 92 40 40

96530706
223 162 138 113 80 40 19 19

Also, a description of what this table does would be helpful.

Thanks.

Paul

 

Its the same table as the Sync Accel load vs. coolant temp it just happens to be labeled differently because it was discovered before MrFred did his full diagnosis of the fuel path.

Seems the 9417 rom likes to add quite a bit more fuel during accel for the cold car run than the new rom.

Quote from MrFred:
SyncLoadAccel only contributes continually to the fuel pulse width when uncompensated load is below a ceiling value defined by a table described below. When the uncompensated load rises above the value in the table, the SyncLoadAccel contribution is quickly decayed to zero even if load is still increasing. DeltaMasterLoadPos must exceed a threshold value before a SyncLoadAccel contribution is generated. There is a table of threshold values for steady throttle and another table for increasing throttle. The steady throttle threshold values are replaced with a constant when a flag is set. There is also a table that limits the maximum value for DeltaMasterLoadPos. The tables affecting the SyncLoadAccel adder for the 88590015 ROM are:

 

This might aid in explaining why we are getting cold drive lean conditions.

Solving the cold start/idle/drive issues has become a major task. It appears that v7 does not like to run in cold weather on 8s. The variations in the tables could be the cause. I have found several so far.

 

Yep I've been adjusting my car slowly for the cold as well

EDIT:

As a note i have my 8 driving very well now on the cold just the first few minutes of any real load are slightly lean say about 1 point too lean which is ok but of course not perfect :P.

 

I loaded the 9417 values in my v7 table. The car is getting cold.

I made a ton of other changes too. I will get it started in a bit and report back.

 

Good luck, truly, not is a sarcastic way.

I've noticed any time I "make a lot of changes" at once, I almost always have to revert back and take it one table at a time.

The patch just seems to be very sensitive to say sub-20 degree weather on my car. It's back in the 20-30 range and my car is back to starting and driving fairly well when cold. It was hell getting it started in 5 degree weather though.

 

I never have a problem starting....it is cold idle and cold drivability that give me some issues. I about have the all resolved. Maybe this will be the last piece of the puzzle.

 

There are a couple running enrichment tables which should do the trick in making the car idle at cold temps. Honestly I have mine run just a bit rich for the first 30 seconds or so just to prevent the car from stalling while the cylinder comes up to temp enough to run the ethanol.

 

The cold issues mostly stemmed from removal and dasabeling of the EVR and EVAP equipment.

 

Ah i see i have mine attached but periphery wise disabled.

 

win, good call, I'm going to check these vs my old tables. My car is a bit lean while way cold on the new rom.

 

I haven't had any issues with lean cold start and running afr, if anything it runs a bit too rich for my taste until it warms up. Usually I see around 12.5afr when first started, and mid to high 13's when I'm driving without the coolant up to temp. Once the coolant temp starts to raise a little, then it swings back to the normal ~14.7 range for idle and cruise, and that's usually within under 5 minutes in 20*F weather.

 

same here.

have you adjusted your maf for a filter or???? just wondering what the difference is with the lean fellows.

 

The car will run leaner and pull timing to rapidly warm the cat. These are within the cold start ignition table.....there is a hole of -5 timing. Then the fuel will lean out a lot as well.

I believe the cold start ignition table should be a cold start fuel table. If you change the scaling to AFR you will see that the lean area is exactly in the same location as the hole of -5s. These tables together are exactly what the car does when it is cold.

In addition, the EGR routines will open up when cold to recirculate exhaust gasses to, again, rapidly warm the engine.

Since most of us do not have a cat, have the EGR, and EVAP routines disabled or removed, the issues we see are compounded because of the changes we have made.

If you look at my thread

https://www.evolutionm.net/forums/ec...-searched.html

You will see everything that was discovered so far about cold start/idle/drive issues. The solutions on the first page are about a 95% solution.

The table in the OP of this thread aids to further solving the cold issues.

 

Checked mine, they're just the same as they always were.