stunt2

iTrader: (8)

as above, was thinking switching to constant open loop. only know that in this mode car disregards o2 and runs only on map afrs.
is there anything else I should know or take into consideration ?

Raptord

iTrader: (10)

Only "side-effect" is that you need to check your fuel map to make sure AFR's are OK when cruising and idling. So it might take a bit of messing around with the fuel map, but other than that I don't see any negative side effects that could occur from running full-time open-loop

dolphin888

As well you might need to tune warm up enrichment maps a little bit, especially if you want to lean out your idle a little bit.

tscompusa

iTrader: (31)

these cars run open loop fairly easy and decent actually. i do it on some of my sd cars.

stunt2

iTrader: (8)

I'm going to zero out or lower tps and load thresholds, all four tables. is it correct way ?

stunt2

iTrader: (8)

what to aim for ?

boostless

iTrader: (21)

sub'd for more answers

dolphin888

You may need a little bit more fuel, when engine is cold, in order to get more stable, smooth idle, in some case leaner AFR may result in a rough idle while warming up. In closed loop warm up is controlled by lamba as well.

stunt2

iTrader: (8)

under what table is that warm-up enrichment map located ?
can't see it anywhere in my 96530706 v7 rom
only see warm-up ignition retard

ecktt

Wouldn't the "self-calibration" of the injectors be disabled. Lets say, that over time the injectors become dirty to the point the car runs dangerously lean. If in open loop constantly would it not fail to throw a P0171?

Raptord

iTrader: (10)

Why would the injectors become dirtier from running at the same AFR but in open loop instead of closed?

ecktt

That's not what is not what I ment.

Raptord

iTrader: (10)

Then what did you mean?

ecktt

Lets say the injectors get dirty because of contaminated gas (it is just an example, concentrate on the fact that the injectorts progressively deliver less fuel). Without closed loop, the ECU will never adjust the STFT and LTFT and so not know that the that the car is running lean since fuel trims will remain constant. If fuel trims remain constant and inside the 25% limit, it should not produce a P0171 event.

Raptord

iTrader: (10)

Ah I see what you mean now.