Thinking about going with a EBL. I'm not sure I understand the learn mode it has. From what I understand there is a wide band learn mode and a narrow band learn mode. I assume you could/ would use WB for initial tuning then set it back to NB once it was dialed in? My engine wants to run richer than stoich. Could I use WB learn for other than 14.7:1 and then turn back to NB and still have richer than 14.7:1 and closed loop?
Does the WB learn actually change the bin or does it update a BLM table to be used for further tuning?
Would I still need to tune PE mode manualy/ seperate from the EBL learn mode?
I know it's a bunch of questions all in one but I'm just trying to get a idea of what's going on before ordering.

 

Both the NB/BLM & WB VE Learn change the VE table. Upon stopping the VE Learn session the VE table is updated, the checksum calculated, and the new BIN file is created, ready to be used.

Using the WB for learning takes place in open loop. The commanded AFR is from a table of AFR values (based on RPM/CTS/VAC), which is what the VE Learn targets. The commanded AFR is compared to the WB reported AFR and the VE adjusted accordingly.

In closed loop the AFR is commanded to be 14.7, or basically stoich. The average AFR can be changed from stoich a little bit. By changing the set points for the O2 feedback values, the average AFR in closed loop may be slightly richer or leaner then the commanded AFR (14.7:1).

PE mode can be learned in via the WB learn. However, this is only recommended once the AFR is in the ball park. Best to start rich and remove fuel from there.

RBob.

 

So if I understand this right I could set the commanded AFR to say 13:1 and learn with the WB to achieve that goal but would have to leave it in open loop from then on to keep the 13:1? I wonder how much of a impact would be if I tune it where I live near sea level and drive as high as 7000 ft? Then there's temp changes too....
Still sounds like quite the setup.

 

Yes.

Fueling change due to barometric change is negligible.

IAT support is built in.

I agree.

RBob.

 

OK EBL is ordered. Now I need to incorporate the IAT sensor. Is there a prefered sensor to use and maybe a part number? Could I just drill a hole in the bottom of my air cleaner to install it or is there a better way? Would there be a advantage to the sensor being into the intake manifold?

 

The flash EBL has been ordered and core sent via airmail- I'm hoping for a quick turn around. Am I reading this right- I though that the WB could only be used for datalogging through the EBL- now your saying that the EBL can actually use the data?

 

The What's Up Display (WUD) can use WB input for the VE Learn process. This will update the VE tables in the specified BIN. Which will need to be flashed to the ECM. The WB AFR is also shown on the main display and within the Analysis information.

RBob.

 

I'm thinking that I made the right decision on this slick little unit- you breathed some high tech life into these old units. I know that the 7747 has a big application list and that is likely why you chose this particular model- whar's the future for you- third gen or others?