The ultimate LT1 $$EE patch thread

**kur4o** · 10-31-2015

Open loop Zero tps patch can be easily done. There is 32 bytes space(it`s used for rear 02 sensor) for that to achieve. Alot of variables can be put in place like timer, map range, or mph range. I will have to think about it. BLM cell cant be implemented because it needs to be in closed loop for cells to be updated. CCP is also doable but the way i see it there is no need for patch, just disable the ccp related errors, disconnenect valve and leave it as is(patch can be made also to save some processor load).

Pinout for 95 and 96-97 transmission is the same. I suppose it can work with 95 code, but if there is difference in solenoid resistance, that might be a problem. I need to find out what`s the exact difference between 95 and 96-97 solenoids.
I have been thinking for 98+ls1 transmission with plate and older 4l60 for tcc control.

What do you think of external switches which can change MAF to speed density or loading second spark table.

**steveo** · 10-31-2015

What do you think of external switches which can change MAF to speed density or loading second spark table.

definitely a good idea.

**lionelhutz** · 10-31-2015

I'm running a 96 transmission with a 8051. Best I could find was the downshift solenoid is a higher resistance. It doesn't seem to matter because it works fine and didn't throw any codes.

**kur4o** · 11-01-2015

Initial version for OL zero tps patch.
Different version for manual and auto.
Forced Open loop with external switch on pin B23. ground needs to be applied on this pin through light diode and resistor, for visual confirmation.
Also MAP and MPH check to enable.

Initial version so use at your own risk.
Feedback needed.

**steveo** · 11-01-2015

Originally Posted by kur4o

Initial version for OL zero tps patch.
Different version for manual and auto.
Forced Open loop with external switch on pin B23. ground needs to be applied on this pin through light diode and resistor, for visual confirmation.
Also MAP and MPH check to enable.

Initial version so use at your own risk.
Feedback needed.

awesome, i'll test it (except the auto version, i can't test)

**steveo** · 11-10-2015

i tested your manual OL IDLE patch today; with the patch the car refused to go closed loop at all

**kur4o** · 11-10-2015

That`s good to know. Most likely something jumps not as expected. Bad news is, I don`t have access to running vehicle now and debugging will be very hard.
I`ve been thinking to take new approach. Cell 16 is zero tps, zero mph, cell 17 is zero tps, very low map, cell 18 is zero mph, tps>0.
Do you want open loop only in cell 16 and keep closed loop in other cells. I want to try to duplicate conditions for OL with the conditions of entering this cells.

**kur4o** · 11-11-2015

I`ve switched the settings for forced open loop commanded by PIN b23. (in open state I thought it was 0, but actually it`s 1)
Now is fixed I hope the other part works as expected.

**steveo** · 11-11-2015

Originally Posted by kur4o

That`s good to know. Most likely something jumps not as expected. Bad news is, I don`t have access to running vehicle now and debugging will be very hard.

i know that story... im afraid to experiment too much with my car since its my only car! but i'll try again soon

Do you want open loop only in cell 16 and keep closed loop in other cells.

that would be perfect...

**RobertISaar** · 11-01-2015

Originally Posted by lionelhutz

Best I could find was the downshift solenoid is a higher resistance.

less load on the quad/output driver, so I'd say that's not a problem. if inductance of the solenoid changed as well then it may want to be driven at a different frequency, but it sounds like it works as-is.