obZidian

iTrader: (2)

could someone please help me figure this out. I cant seem to grasp the idea or im reading it wrong.

WAt are the typical afflictions when running in either of the two?

Thansk in advance!!

Angel

obZidian

iTrader: (2)

nobody?

i guess if i removed the newbie part of the title i might get more responses?

Checkmate

iTrader: (2)

open loop - cold start up, hot start for the first 30 second(not sure on how long) and wot.
closed loop - normal cruising

VTC_WS6

iTrader: (9)

What exactly is the question??

CL= 'Normal' operation where the ECU uses feedback from the stock NBO2 sensors to keep the car at the prescribed AFR (typically 14.7:1 for non WOT operation). Done primarily for fuel effiecieny as well as part throttle drivability to an extent.

OL= The NBO2 sensors are essentially 'ignored' by the PCM, instead relying soldey on the fuel maps/tables stored in the PCM's memory to fuel the engine per rpm/load. At least that's how OL works on Honda-based ECU's, from what little I understand of LS1/GM systems, when at WOT (PE mode) the PCM will use monitored LTFT's to make adjustments to the fueling in PE mode as opposed to strictly fuel off the map (or maps in the case of the GM PCM's). I'm not 100% sure about that though so I wouldn't take my word for it.

obZidian

iTrader: (2)

no, basically that was my question. I just needed to understand the difference betweent eh the two and more importantly, wat they meant be "make sure its in closed loop" or "or are you sure your in close loop?"

Is there an enable key that dictates which loop your in or is it by a table and its values?

Also, here is another thing i would like help in:

Whenever i turn on the a/c, the temp goes up to over 238-245*....i know it should run hotter but this is to much!!! Is there anything i can do with the hp tuner to make this not happen. THe temp sensor is farily new and im gona adj. the fan-on temps to see wat happens...is there anything i should look for?

LS1 Sounds

iTrader: (11)

Both fans should be on at all times whenver you have the A/C on no matter what they fan settings are at...

VTC_WS6

iTrader: (9)

PCM decides when to trigger OL based on TPS/load for acceleration stints, you'll also be in OL during start-ups where the O2's haven't reached operating temp. This is of course under normal operation, damage to the O2's or other system failures will force the PCM into OL, or you can adjust parameters within the program to trigger OL when you want, or just disable CL altogether.

LS1 Sounds

iTrader: (11)

Where can I find the parameters that the PCM uses to determine whether or not to switch to open loop mode?

VTC_WS6

iTrader: (9)

Just briefly flipping through the screens here on Tunercat, I see a 'Closed Loop Enable Coolant Temp. Threshold vs. IAT' map that calls my attention. Apparantly you can simply change the coolant temp value at which the PCM switches to CL, simply raise it to a level the coolant will never actually reach and viola! Permanent OL.

Now I don't know if this is the 'status quo' way of disabling CL on GM's, like I said it's just something I stumbled accross here while going through the maps.. I've got ALOT to learn!! Sometimes I miss Honda maps with there grand total of 4 maps vs. the 40+ on these GM's!!

LS1 Sounds

iTrader: (11)

Yeah, there's a similar setting you can use in HPT to run Open Loop all the time. I was wondering more about the TPS settings that affect it?