Tail end of the LSX Swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NC_John · 08-29-2018, 09:43 AM

Well, after two years of work, I'm finally driving the truck some now. Got the exhaust done. Then got it to the engine shop for a (next to) final tune (road and dyno) last week. Got out in it over the weekend and shot some gopro video. Didn't get too crazy yet. Need to get used to the new power and how the truck deals with it (not well so far), its REALLY squirrely.

Here's one of the final dyno pulls.

https://youtu.be/DeOz7v7Zw-Y

A first, second and third gear burnout (nothing too nuts and I kept trying not to hit the rev limiter).

https://youtu.be/ynrT3P8-dvM

And just a couple going through the gears with just "moderate" enthusiasm, not a speed/acceleration run.

https://youtu.be/2LGIDi-KMJE

https://youtu.be/6uFK5NZaat0

I've got just a shortlist of items to finish the swap. I need to get the cruise control working. I need to tighten up the rear axle/suspension (working on this with Rob at No Limit) and get this thing more stable when I romp on it. Need to tie the A/C request with the PCM to activate my high rpm/ WOT cutouts (tuner said he can enable that for me and I have a spare wire I pulled). Need to get the squeaky/chirpy serpentine belt quieted down (shorter belt that I can tension to spec I think). And my kid requested I get shoulder belts instead of just the lap belts. Not a bad idea.

**mongocanfly** · 08-29-2018, 12:05 PM

Sweet...

Macdaddy1 · 08-29-2018, 01:58 PM

Way cool. Can't wait till I am at that juncture in my build. Shoulder seat belts is a must.

NC_John · 08-29-2018, 03:54 PM

Quote:

Originally Posted by mongocanfly

Sweet...

Quote:

Originally Posted by Macdaddy1

Way cool. Can't wait till I am at that juncture in my build. Shoulder seat belts is a must.

Thanks guys. It took about a year longer than planned and a lot more money than expected but I'm happy I can start to enjoy it now.

**1971Stepside** · 08-29-2018, 04:07 PM

Very cool. I'm a long ways away from this, but thanks for sharing the motivation.

NC_John · 08-30-2018, 08:21 AM

Quote:

Originally Posted by 1971Stepside

Very cool. I'm a long ways away from this, but thanks for sharing the motivation.

Hang in there. Like I said, my build went a year over plan with all the extra stuff and costs I hadn't considered. Most of it my own doing- I realized late you can't just double the HP of something and not upgrade everything behind it so it survives.

08-29-2018, 09:43 AM	#1
NC_John Registered User Join Date: Jul 2013 Location: Rockwell, NC Posts: 1,639	Tail end of the LSX Swap Well, after two years of work, I'm finally driving the truck some now. Got the exhaust done. Then got it to the engine shop for a (next to) final tune (road and dyno) last week. Got out in it over the weekend and shot some gopro video. Didn't get too crazy yet. Need to get used to the new power and how the truck deals with it (not well so far), its REALLY squirrely. Here's one of the final dyno pulls. https://youtu.be/DeOz7v7Zw-Y A first, second and third gear burnout (nothing too nuts and I kept trying not to hit the rev limiter). https://youtu.be/ynrT3P8-dvM And just a couple going through the gears with just "moderate" enthusiasm, not a speed/acceleration run. https://youtu.be/2LGIDi-KMJE https://youtu.be/6uFK5NZaat0 I've got just a shortlist of items to finish the swap. I need to get the cruise control working. I need to tighten up the rear axle/suspension (working on this with Rob at No Limit) and get this thing more stable when I romp on it. Need to tie the A/C request with the PCM to activate my high rpm/ WOT cutouts (tuner said he can enable that for me and I have a spare wire I pulled). Need to get the squeaky/chirpy serpentine belt quieted down (shorter belt that I can tension to spec I think). And my kid requested I get shoulder belts instead of just the lap belts. Not a bad idea. __________________ 1970 C-10 LWB "Blu" Instagram (current build pictures) 70_nc_c10

08-29-2018, 12:05 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,671	Re: Tail end of the LSX Swap Sweet... __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

08-29-2018, 01:58 PM	#3
Macdaddy1 Registered User Join Date: Dec 2017 Location: Niceville Florida Posts: 347	Re: Tail end of the LSX Swap Way cool. Can't wait till I am at that juncture in my build. Shoulder seat belts is a must.

08-29-2018, 04:07 PM	#5
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	Re: Tail end of the LSX Swap Very cool. I'm a long ways away from this, but thanks for sharing the motivation. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

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