Anyone care to comment?

Car spits and farts. If I lean it out, it gets worse. If I fatten it up, it gets worse.

Setup is 9.3:1 alum head, 230/245 .535/.540 114lsa 112ica, singleplane manifold, 42lbs injectors, blower.

Basicly. Cruise gets some backfires. On throttle and it spits and farts. Once it 'cleans up', you can run it to 5k and the tires will roast.

Wondering if maybe I should start fresh again with the bin, and maybe import a vette timing table as a starting point ?

This is a 2-bar $60 setup right now.

Any suggestions appreciated. Been tinkering with this since friday and I can't find anything that improves it. Been up and down with timing and ve, ae, etc.

LOGS

excel: http://members.cisdi.com/~anesthes/logs/ver4-4.xls
csv: http://members.cisdi.com/~anesthes/logs/ver4-4.csv
datamaster: http://members.cisdi.com/~anesthes/logs/ver4-4.uni

BIN: http://members.cisdi.com/~anesthes/l...sion4-rev4.bin
-- Joe

 

Noone loves me..

 

Question: what time base is Runtime? And packets/second rate?

Looking at the block of records from 1240 through 1290 inclusive, I see multiple issues. One is that the injector PW may be getting too small (1.28 msec). It is possible that the fuel flow is actually stopping at the lower PWs. To correct this need to tweak an injector bias table.

Also note how wide the O2 sensor swing is: from lows of 53 mV to highs of 861 mV. The INT is also low: 93-111, and bouncing around. Hopefully this is a GM AC/Delco O2 sensor.

The wide O2 swings may be being caused by too much proportional gain. These are typically a PW based modifier, and need to be reduced as the injector size is increased. If the injector size is basically doubled, then halve the proportional gain values.

Not knowing the packet rate, or the time base of the Runtime column, I can only SWAG the INT bouncing. It just may be that the PID loop is chasing it's tail. If the O2 sensor has been moved down the pipe the INT & Prop delays will need to be increased.

Once the loop settles down it will be easier to tune in the VE tables.

RBob.

{edit: can you get a WB hooked into the ECM and data log that also?}

 

Runtime is in MS. I think it was logging 6 records a second..

Those records are a cruise area where I was holding throttle to see if it was smooth. (wasnt).

It's a heated ac/delco o2, in the driver collector as close to the primary as possible.

Where are those tables? I lowered the BPW for the injector size, and figured the rest would be done in VE..

Hrmm. The stock swing point is time below / above .450v correct? So your saying increase the allowable time in ms until the int/blm stableize?

The bin I'm working with is based off my last-years engine. Which had different cam, heads, compression ratio. I figure d change the BPW, drive around and fix ve but. After 5 days I can't get the VE any closer than the first test drive and its driving me nuts..


I don't have a wideband setup..

-- Joe

 

I reworked ve a lot, and added some timing. Its a little better now.

I'm getting a stumble at constant throttle. When I accel hard, it sometimes pops and then bucks. Looking at the narrowband AFR gauge while doing it, it goes to 0, then when it comes 'back" it lights up the tree to the .800s area.

So that not enough ae??

Heres a new log:

http://members.cisdi.com/~anesthes/l...4-4-spark2.xls


Comments ?

-- Joe