When you switch from one program to another does it erase the tables that have been stored by the EEC? If so, it's like disconnecting your battery every time you switch and the EEC has to update the tables.

I am considering a flip chip, but if it does erase the tables it could cause your L to run rough for a little while.

Shed some light on this for me, guys!

 

No. Over rights them, and pretty darn quick I may add.

 

Overwrites them with what? They DO allow the EEC to update the tables, don't they?

 

Can you flip it while you are driving? Or is the flip part in the engine?

 

On PSP's fip chip, two wires feed out of the chip and are terminated by an on-off switch that you can mount within reach anywhere in the cab. 'On' is one side while'Off" is the other. I chose 'economy' and 'street performance'. You can change 'sides' while driving--just 'flip' the switch.

Dan

 

Over rights them with the new settings that the chip feeds it. The PCM gets all its performance data from the input of the chip. Its when you remove the chip that the tables will stay for a while till the pcm recalibrates them to match its original settings. Unless you disconnect the battery.

 

I think there is a bit of confusion here, because there are two different things being talked about.

There are two types of memory that the PCM stores. One is the kind that the chip overwrites and the other is the kind that is cleared with no power.

When you plug a chip in, it overwrites one of the memory banks of the PCM, and the PCM now uses what's on the chip. When you have a multiple program chip, that means the chip has several banks of memory to use, i.e. different programs. You CAN switch a multiple program chip on the fly, while the motor is running. There is no harm in this. However, not 100% of the memory resets. Some of the trans calibrations require a key cycle to reset, while the timing and fuel tables do not. So it's not NEEDED to turn the key off, but it's a good idea.

The other kind of memory is based off the adaptive strategy. This is your long fuel trim tables. These tables are what constantly get changed while you are driving. These tables do not get reset with a key cycle, only with loss of power. I believe this is what the poster of this topic is referring to.

Hope this helps.

 

Thanks Sal,

That is exactly what I was referring to. So if I understand you correctly, when you change programs the adaptive memory remains intact. Which means when you change programs, the adaptive memory was actually modified using the other program, which also means there is a period of time where the EEC is "getting used to" the new program, making the necessary adjustments to the adaptive memory. Engine performance will also change as the EEC adjusts to the new program.

Does this sound right?

-Sammy