Mopar 318 5.2 gm tbi swap and 4.8 Jeep

[tbone88]

Thanks Dave! I do have a Chrysler dizzy that I converted to allow the ecu to control. Basically removed the vacuum advance and locked the mech advance. The reason I went fuel only is because before I thought i was going to tune the Timing on the stock chip wasn’t setup well for the mopar.

I have data logged with TunerPro and I’m working on data logging and tuning at the same time. I will use that spreadsheet that someone posted under the 7747 sticky that uses the logged blm value to adjust the fuel tables.

Can you help me understand the main fuel table vs the second fuel table in TunerPro from the 7747 definition?

[dave w]

The 1227747 fuel tables can be confusing. To simplify the VE tables, I add VE2 values to the values in VE1, then ZERO all the values in VE2. Add VE2 RPM values to all matching RPM's cells in VE1. With tunerpro Version 5, VE2 will accept ZERO's, but usually shows a value close to 5 after saving all ZERO's in VE 2.

The reason for adding all VE2 values to VE1 allows all VE adjusts to the VE1 table.

dave w

[tbone88]

Thanks again Dave. That is exactly what I needed to know. Really appreciate your help. Happy holidays.

[tbone88]

So I got the ecu tuned pretty well. The blm values all return 128 or very close to it (130 ish). However I can’t seem to get the idle down. It likes to stay around 800 rpm and I would like to get it down to around 650 or 700. All the target idle values are set accordingly but it can’t seem to get down that far. The idle vacuum is also around 40 Kpa which seems high to me also. Is there a good tuning sticky for the 7747 I could review? I’ve read through several tuning concept pages but nothing specific to the 7747.

Thanks again in advance

[tbone88]

so it's been a while and I did get this worked out fairly well. I realized my idle problem was b/c when the logger is plugged in the ECU goes into diagnostic mode. once I unplugged, all good.

So I am having a new problem. I got the truck all set to run on the road. It runs great on the flat but when I pulled a BIG hill, it was doing fine for a while then "coughed" and started seriously overheating.

The slope is about 4 or 5% then goes up to maybe 8 or 10%. When I hit the steeper section I started loosing speed and put my foot into it maintain speed. this is all about 3200 rpm. the engine coughed about 4 times then the temp gauge shot up to 250 degrees. I pulled over and let it cool. I determined that the fan clutch was shot so I went and bought a flex fan that I installed. tried it again and got the same result.

so I think when I tuned it I just did not put enough load on the engine through enough different rpm ranges? is there a point in the 7747 ECU that it goes into Open Loop? is that my problem? any help would be amazing! I do plan on logging it again later this year on that same hill to see if I can get it better tuned with a load.