Has anyone else caught this in the hac yet? (Positive I'm not the only one)

L852A : FCB 171 Coolant less than88C,skip SAM update

When hot on the highway in summer my car is barely cracking that number(88C).

I would tend to believe that dropping this number to a more manageable figure as in 80-82 C range would be far more beneficial to many of us. Especially the fols with heavily modded cooling systems and/or extreme weather, like it is here now with multiple 0 deg and less days in a row ....

Any comments and/or issues if dropping the SAM < 88C value is good bad or indifferent?

Im not talking crazy like droping it too 40C but making sure the SAM is active in my most normal cruising/driving conditions?

Defnitely one of those things that come into play when not using a stock 190-195 t-stat..

Thanks
Jeremy
PS Bruce thanks for showing me how to so this and Rbob , am i doing better than posting furiously every 2 weeks and then dissappearing as of late? lol

 

LOL, yes, yes you are. . .
RBob.

 

This is the first time I have heard that term, what does stay alive memory do exactly?

 

From my gathering, its active from 88 - 104 deg C. This would lead me to believe it is the memory that our cars use to learn the BLM in the cells it has been in long enough to recognize and learn....

Our cars can correct for themselves within reason for what it sees as being rich or lean, i believe the SAM is indeed that process....
LAter
Jeremy

 

Hmm, never really looked at that area. Interesting.
But, I'll stick to my open loop stuff <g>.

 

FWIW, I haven't messed with that constant either. There are just so many! Another constant that nobody has discussed (not to hijack your thread) is the idle cell. Most people know that the idle cell is cell 4. Well - that's a constant that can be changed too. There's just soooo much to change and so little time when you have a full time job and a family .... and no garage - rofl.

Tim

 

SAM = Stay Alive Memory

I would have to imagine it is the leanring process are cars go thru, at least in my limited knowledge of code reading and changing and what i can decipher from the hac.

Im suprised no one else has any info or comments on it?
hmmmmmmmmmm

after the first 70 or so pages of the hac, what is all the other mumbo jumbo anyhow? thats where i get completely lost at?
LAter
Jeremy

 

Valve springs in and car alive again :-)

Did some datalogging to make sure the tune was not affected at any given point, and thank *** it wasnt.

Did however notice that with a 180 t-stat and the lower temps , that my car would run under the 88C designated by the SAM update..... Since i believe that this is the cell learning process that are cars go thru for driveability, fueling , etc: I am also going to lower my SAM update low end temp to roughly 82-83C to see what effect it does indeed have on the car(if any?)

(think im correct here, but may be wrong if any one else know?)

What is the mumbo jumbo in the hac after the defined tables?
Is it the routines the ecm/software uses?

thanks
Jeremy

 

My understanding of the SAM cells are that they are the ones that are kept during engine off time. Then at the next power up they are then loaded into the regular cells (just a couple) to be used. If no learning of the SAM cells takes place then the ECM has to re-learn from 128 after the next powerup.

Yep, the 'mumbo jumbo in the hac after the defined tables' is the code. The instructions that make it all happen. This is the stuff that gets read to figure out how the tables are used. And assembled into binary for the CPU to run.

RBob.

 

Good, now get back to tuning.