Lean transition to closed loop.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Lean transition to closed loop.
Hello. I watch my AFR gauge and my laptop. When my computer switches from open loop to closed loop, the AFR gauge goes to 18:1 and drops down to 14.7:1 as the integrator moves up.
Anyone know how I can correct this?
It is on a 1985 Corvette with '870 ECU. Thanks.
Anyone know how I can correct this?
It is on a 1985 Corvette with '870 ECU. Thanks.
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
If you want to dial in your MAF tables very closely, it takes time but you could warm the car up and then force the car to run open loop and zero out your fuel adder tables for load and temperature and then tune for a 14.7 AFR at light and moderate loads, then put the car back in closed loop. That will assure you that your low to moderate load MAF tables are dialed in correctly and then your transition to closed loop will be very smooth on the AFR gauge. This will more then likely require you to retune your open loop fuel adder tables for load and temperature to hit your desired open loop AFR of 12.5 or so when the car is warming up. (time consuming but if you do this the car will run like stock or better)
Last edited by bjankuski; Apr 14, 2015 at 08:21 AM.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
I think I figured it out. It was having a lean transition to closed loop because I had uploaded a new tune, so that must have reset the BLM.
When I let the car learn the BLM, and attempt to transition from open loop to closed loop, the transition is good.
However, I did notice that in different weather conditions, the BLM changes. Anywhere from 118-136 at the same RPM, same MAF gms/sec, just on different weather conditions.
When I let the car learn the BLM, and attempt to transition from open loop to closed loop, the transition is good.
However, I did notice that in different weather conditions, the BLM changes. Anywhere from 118-136 at the same RPM, same MAF gms/sec, just on different weather conditions.
