LM4 5.3L and 4L60E swap into 2004 LJ
- Thread starter LBarr2002
- Start date
First trail ride yesterday, home, and quick inspection. It worked pretty good yesterday. It idled around most of the trails with plenty of torque on tap. Tcase stayed in gear. Temp sat at 195 and it didn't push coolant out of the overflow, so looks like that's fixed.
It definitely needs to be tuned, seems pretty rich and could be crisped up.
I knew I still had a little driveshaft to exhaust rub, but I heard a louder rub at times. The front yoke is touching the pipe at times.... probably going to have to get the driver's side exhaust reworked a little.
Tomorrow I'll clean it up and do a little closer inspection. If all is well I'm going to try to drive it to work all week.
It definitely needs to be tuned, seems pretty rich and could be crisped up.
I knew I still had a little driveshaft to exhaust rub, but I heard a louder rub at times. The front yoke is touching the pipe at times.... probably going to have to get the driver's side exhaust reworked a little.
Tomorrow I'll clean it up and do a little closer inspection. If all is well I'm going to try to drive it to work all week.
I've mentioned in this thread about how several people commented it wasn't worth doing with 'just a junkyard 5.3". Any time I hear that, I'll post this picture...
7.4 second 0-60 by gps. Full tank of fuel, hard top, and 100 lbs of shit in the back from the uwharrie trip. Also a soft launch. Could probably be sub 7.0s. Cut 0-60 time IN HALF with just an ol' junkyard 5.3 that hasn't been tuned yet.
7.4 second 0-60 by gps. Full tank of fuel, hard top, and 100 lbs of shit in the back from the uwharrie trip. Also a soft launch. Could probably be sub 7.0s. Cut 0-60 time IN HALF with just an ol' junkyard 5.3 that hasn't been tuned yet.
Just got home from a ride along tune with Charles. His base tune was pretty good but made a few adjustments.
It was lean up top, so fixed that and said it should have picked up some power. He also adjusted the point at which it goes into 'power enrich' mode. Normally the O2 sensors keep air fuel at 14:1. In power enrich mode it ignores the O2s and goes richer, 12:1. This setting base was at 60% load and he upped it to 75%. This should help highway mileage.
At Uwharrie, it was idling fast and trying to 'run away' when just cruising trails. He adjusted the speed at which the idle is controlled by vss up to 19 mph (stock was 4 mph I believe). Because I have my vss in front of the tcase, in 4 low it thinks it's going 2.72 times faster than it actually. Now, compensating for the tcase reduction, it should hold the idle down until 7 actual mph.
It was lean up top, so fixed that and said it should have picked up some power. He also adjusted the point at which it goes into 'power enrich' mode. Normally the O2 sensors keep air fuel at 14:1. In power enrich mode it ignores the O2s and goes richer, 12:1. This setting base was at 60% load and he upped it to 75%. This should help highway mileage.
At Uwharrie, it was idling fast and trying to 'run away' when just cruising trails. He adjusted the speed at which the idle is controlled by vss up to 19 mph (stock was 4 mph I believe). Because I have my vss in front of the tcase, in 4 low it thinks it's going 2.72 times faster than it actually. Now, compensating for the tcase reduction, it should hold the idle down until 7 actual mph.
Tripp used a different filament for the intake elbow than he normally uses in the printer, but we still weren't completely sure it would hold up to the under hood temps. As a preventive measure, I decided to epoxy the part. The epoxy should give it extra strength and prevent deforming at high temps.
One thing we didn't really plan well was all the runs of electrical wires back and forth across the firewall. We ended up with 4 runs of smaller loom. I pulled all of that off and ran a single 1.5" inch loom where it will fit under the tab for the stock harness.
One thing we didn't really plan well was all the runs of electrical wires back and forth across the firewall. We ended up with 4 runs of smaller loom. I pulled all of that off and ran a single 1.5" inch loom where it will fit under the tab for the stock harness.
Today Tripp put a 200 ohm resistor in my gauge illumination circuit to dim the light to be bearable at night. We also started looking at the cruise control.
I added another half inch of bump stop to see if that would be a temporary fix for my exhaust clearance. Once I make my decision on cage, I'll probably be playing with spring height a little.
I added another half inch of bump stop to see if that would be a temporary fix for my exhaust clearance. Once I make my decision on cage, I'll probably be playing with spring height a little.
Crossing over between the regular build thread and the swap thread. I had to pull the winch again (which means bumper too) so I decided to swap the power steering line that got into the crank pulley at some point. The new replacement is shorter for whatever reason, but that's a good thing. Doesn't look like it could get into anything again.
I decided since the power steering reservoir was empty anyway, and I wasn't happy with what I had, I'd go ahead and switch it out. The new tank has the return fitting lower so I don't have to fill it all the way to the top to keep it from aerating.
The threads were pretty shitty on this new tank, and the fitting cross threaded while trying to install in place. I had to pull it out and run to TSC looking for a 9/16 18 die, which of course they didn't have. But they did have a grade 8 nut, so I used that to clean the threads and got it done.
Finished reconnecting the winch and all, but had to quit for dinner before cleaning the fluid off everything and reinstalling the belt.
I decided since the power steering reservoir was empty anyway, and I wasn't happy with what I had, I'd go ahead and switch it out. The new tank has the return fitting lower so I don't have to fill it all the way to the top to keep it from aerating.
The threads were pretty shitty on this new tank, and the fitting cross threaded while trying to install in place. I had to pull it out and run to TSC looking for a 9/16 18 die, which of course they didn't have. But they did have a grade 8 nut, so I used that to clean the threads and got it done.
Finished reconnecting the winch and all, but had to quit for dinner before cleaning the fluid off everything and reinstalling the belt.