nAst1: Progress and Concepts Thread

[robertisaar]

stalling after coasting SEEMS like it could be a DFCO thing, you may want to change up the MAP or RPM settings used to come out of it when the clutch goes in, otherwise, the engine will spin down pretty quickly. "Maximum RPM Decrease in 12.5mSec to Stay in DFCO (KDFCODRM)" would be a good one to check out, maybe drop it down one notch(12.5RPM resolution). alternatively, if you happen to have a clutch switch, i may need to integrate in a check for the switch being depressed and automatically kick out of DFCO, but i'd prefer to have other options checked first.

i can't remember what engine you're running off-hand, but the newest spark tables in the 104 release would be a good idea for a 3.1, or since you're running such a light car, the L/N body 3100 spark tables, should you be running a gen3, even though they're meant for an auto.

i wouldn't think single-fire would cause a mileage increase, since the same amount of fuel is delivered as double-fire, just at different times.

[cavfan1]

Checking back in with a couple of observations and thoughts after running 1.03 for the past month and then some. First, fuel mileage is quite awsome! I've done mainly around town back and forth to work type driving with very limited highway. Lowest observed mileage was this past week with NO highway trips at 24.3, highest was 26.7 roughly 70/30 city-highway. Coming from 19-20 mpg back and forth to work, the increase has been noticeable and welcome. I should have a highway trip next week to see what I can get there, though its been pretty good there anyways, 28-29 usualy.

The idle spark changes helped a lot to keep it running steady, still slightly rough, but its always seemed that way. Also, maybe once a week it will just flat out stall as soon as the clutch is put in, usualy after coasting a ways at medium speeds. I have my DFCO hit pretty much right away, and I thought maybe it wasn't catching itself quick enough on clutch in, but I haven't duplicated it yet while trying to make it happen.

Last, for me with the bigger 3100 injectors and pressure, I only hit the single/double switchover at WOT for the most part, or if I hang the revs way up, say 4000+ and a decent amount of load. 98% of my everyday driving stays in single fire, and when it does switch, I don't feel the single -> double hit, its the double -> single switch I might feel. For me, single fire works great and I'd think its a big part of my mileage jump, so I'll keep it for now. I might try the new one for something to do later though.

[robertisaar]

disappointing.... i was hoping some kind of MPH would register, even if it was horribly off...

90-92 V6 F-bodies had electronic setups....
all of the early J-bodies use an optical setup, but also use a buffer and grounds pin A10 at a rate of 2K PPM...

looks like the only code i can even study that was on a 7730/similar was 8D.

[Superdave]

nada


I guess old Jbody code might have the right stuff.. 89 ish. I'll have to look tomorrow. Stock V6 camaro code would have it as well.



There is a VSS for the 700R4 that has both outputs but it's almost $100. I need to find out if it's stock for some random car and yank one from the JY.. that would solve everything. *edit, '90-'92 Police cars

[robertisaar]

here's a good question: what happens when you hook up your VSS optical output to the ECM's optical input and set the road speed constant to 2K or 4K PPM?