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  #71  
Old 11-01-2012, 04:39 PM
rockrod rockrod is offline
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If you spend some time on the HP tuners forum it's spelled out on how to do it. The vortec trucks control the tow/haul through the serial connection and BCM, but it's possible to wire in pin 71 on the blue connector that provides a momentary ground, and this will cause the PCM to cycle through the normal and performance modes of the trans maps. So you could have one set up for 'normal' driving with a comfy cruiser and lots of torque management and another that will slam shift with no torque management.... I just don't know how long a stock 4L60e would hold up to that

I still want to go back and wire in the a/c request module so that the pcm can control the idle when the compressor cycles. It works for now, but it's not very smooth in the transition. lot's of stuff still to do..
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1994 FZJ80. Elocked, MAF 3/2 Lift, BFG 315 KM2s, stock 4.10s, ARB bullbar and a Warn 8074 winch.

powered by an all-aluminum 335hp L33 Vortec V8

2004 Kona Stinky dee-lux.
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  #72  
Old 11-01-2012, 05:25 PM
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Quote:
Originally Posted by rockrod View Post

I still want to go back and wire in the a/c request module so that the pcm can control the idle when the compressor cycles. It works for now, but it's not very smooth in the transition. lot's of stuff still to do..
ahh, one thing i have not done. right now my AC comes on with no idle up. usually it is not a problem. sometimes it'll kill the motor.

that's the only thing i gotta do, 4 years and 100k miles after getting the swap driveable
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  #73  
Old 11-04-2012, 10:23 AM
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another update:

Fixed my flaky tach issue. It turns out the output pulse signal in the vortec pcm was set wrong and was causing the stock indash tach to jump around. I reset the signal back to the stock LS1 4 count per rev and then using my dakota digital converter I was able to stabilize the gauge. Now it's smooth and responds correctly.

I also figured out how to activate the 'tow/haul' mode.

Normally the silverado trucks use the body control module to respond to the truck tow haul button and sends a request over the serial data to activate the secondary shift pattern. By activating the pin 71 in the blue connector, it now responds to a simple ground circuit request and momentary push button switch. By pushing the button once, the circuit from the pin 71 is ground to chassis and the PCM commands tow haul mode and raises the shift points, holds the gears longer, and firms up the shifts. Push the button again and it reverts to normal mode.

pretty cool! I can go back and edit the shift patterns later as needed.
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1994 FZJ80. Elocked, MAF 3/2 Lift, BFG 315 KM2s, stock 4.10s, ARB bullbar and a Warn 8074 winch.

powered by an all-aluminum 335hp L33 Vortec V8

2004 Kona Stinky dee-lux.
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  #74  
Old 01-21-2013, 11:25 PM
rockrod rockrod is offline
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Been awhile so it's time to update:

Nothing. It's been running great and averaging about 17 mpg on my daily commute to and from work. I have noticed the heater works very well, probably because the vortec likes to run about 195f. The fans don't kick on until it gets to 206 which is very infrequent.

I invested in the hp tuners software so that I could find tune the engine. Mail order tunes will get you running but it's impossible to dial the motor in like that. hp tuners is a godsend.

Finally the v8 power is a bit of a handful in the snow and ice. It's extremely easy to spin all four tires. It needs traction control.
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1994 FZJ80. Elocked, MAF 3/2 Lift, BFG 315 KM2s, stock 4.10s, ARB bullbar and a Warn 8074 winch.

powered by an all-aluminum 335hp L33 Vortec V8

2004 Kona Stinky dee-lux.
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  #75  
Old 01-22-2013, 09:28 AM
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Great to hear. Over here with your donor engine I have about 13,000 on my rebuild. Its running great. Its very strange to have zero oil consumption between changes. Plainly your rings were good! I think I finally tracked down the last super-slow coolant loss to the overflow bottle cap, but sending oil to Blackstone just to be sure. The gasket was a bit crusty so I gave it a good scrub and will see if that lets it seal. Otherwise the cap is about $10. Cap and bottle around $80. The triple fan pulley ever so slightly hits the back of the A/C belt so I plan to swap that out. I also have a PS line weep - I think the low pressure return from the gearbox. And still lousy fuel mileage and inherent traction control byproduct of a tractor engine.
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  #76  
Old 01-22-2013, 01:56 PM
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Quote:
Originally Posted by rockrod View Post
Been awhile so it's time to update:

Nothing. It's been running great and averaging about 17 mpg on my daily commute to and from work. I have noticed the heater works very well, probably because the vortec likes to run about 195f. The fans don't kick on until it gets to 206 which is very infrequent.
Sweet

When are you going to start offering outside sales and installation?
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  #77  
Old 01-22-2013, 08:59 PM
rockrod rockrod is offline
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Quote:
Originally Posted by corsair23 View Post
Sweet

When are you going to start offering outside sales and installation?
I thought about it, but the time commitment is huge. I might sell this one in a year or so and try something different. I plan on using it a lot this summer now that the triplets are easier to deal with on long car rides.
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1994 FZJ80. Elocked, MAF 3/2 Lift, BFG 315 KM2s, stock 4.10s, ARB bullbar and a Warn 8074 winch.

powered by an all-aluminum 335hp L33 Vortec V8

2004 Kona Stinky dee-lux.
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  #78  
Old 04-21-2014, 11:04 PM
rockrod rockrod is offline
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So.... Another update. The cruiser is still running strong with the swapped in motor and trans. I did have to replace the radiator last week. The original lasted 193k miles.

My wife and I went for a weekend stay at devils thumb ranch and on the way back to pick up the kids, I started to notice the trans acting weird. It would not hold a gear. Then I noticed a smell of something burning. I checked the rear view mirror to make sure no one was following close and couldn't see out the back window. It was completely covered in oil. We pulled over and smoke was pouring from underneath and fluid was everywhere!

Apparently I did not reinstall one of the trans cooler lines and it tangled with the engine fan.

Now my cruiser is rust proof. I fixed the damaged hose and all is well, but what a mess.
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1994 FZJ80. Elocked, MAF 3/2 Lift, BFG 315 KM2s, stock 4.10s, ARB bullbar and a Warn 8074 winch.

powered by an all-aluminum 335hp L33 Vortec V8

2004 Kona Stinky dee-lux.
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  #79  
Old 04-21-2014, 11:15 PM
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did you ever figure out the ac idle up?
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  #80  
Old 04-22-2014, 11:03 PM
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I haven't. To many other pans in the fire that need tending. Once we get moved into the new house we are building I hope to get this worked out.
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1994 FZJ80. Elocked, MAF 3/2 Lift, BFG 315 KM2s, stock 4.10s, ARB bullbar and a Warn 8074 winch.

powered by an all-aluminum 335hp L33 Vortec V8

2004 Kona Stinky dee-lux.
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