What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[Geotrash]

Just replaced the original 2008 LY6 TPS with a new AC Delco part. Engine fired right up to a normal idle. Doubt this will resolve my sporadic throttle-lag issue, but at least I got to go outside for a bit.

How are you liking the power and performance of that 6.0 overall, now that you've had it in there a while?

 

[Charlie207]

How are you liking the power and performance of that 6.0 overall, now that you've had it in there a while?

Overall, I like it. It definitely has move OOMPH than the mechanically stock 5.3 that was in it last summer. It's certainly quicker off the line, especially the odd time I had it in 4WD Hi, and tried a hard-launch. I really try to NOT beat on my DD, but I had to try it once. On the highway, I notice much less downshifting to 5th gear on long hills that would normally require it with the 5.3, but I doubt I gained much fuel economy, especially with the 33" tires. I did notice a slight bump in MPGs when running my winter 31" tires.

I do feel like the email tune has kind of reached it limit to fine-tune the cam and throttle, and basically all other stuff. It's been very helpful to just datalog, and do the email stuff, but I believe there's a level of polish that isn't possible with it. I have been desperately searching for a "local" dyno-tuner who can do LS stuff in person, but the search is not going well.

The other issue is the occasional warm-start/no start scenario. Again, I believe it's a tuning thing that has been mentioned in previous file revisions, but still not worked out.

Mechanically, the engine has been reliable, doesn't leak a drop (yay!), and sounds good. I'm trying to be financially responsible with a long-tube header plan, but adding cats. to the Speed Engineering headers (at least in my BrainCAD v1) seems to be holding me back. If I had a time machine, I would have just burned up a credit card a bit more, and bought them to install when the engine was out, but I was under an extreme time-crunch to get my daily-driver on the road.

 

[Geotrash]

Overall, I like it. It definitely has move OOMPH than the mechanically stock 5.3 that was in it last summer. It's certainly quicker off the line, especially the odd time I had it in 4WD Hi, and tried a hard-launch. I really try to NOT beat on my DD, but I had to try it once. On the highway, I notice much less downshifting to 5th gear on long hills that would normally require it with the 5.3, but I doubt I gained much fuel economy, especially with the 33" tires. I did notice a slight bump in MPGs when running my winter 31" tires.

I do feel like the email tune has kind of reached it limit to fine-tune the cam and throttle, and basically all other stuff. It's been very helpful to just datalog, and do the email stuff, but I believe there's a level of polish that isn't possible with it. I have been desperately searching for a "local" dyno-tuner who can do LS stuff in person, but the search is not going well.

The other issue is the occasional warm-start/no start scenario. Again, I believe it's a tuning thing that has been mentioned in previous file revisions, but still not worked out.

Mechanically, the engine has been reliable, doesn't leak a drop (yay!), and sounds good. I'm trying to be financially responsible with a long-tube header plan, but adding cats. to the Speed Engineering headers (at least in my BrainCAD v1) seems to be holding me back. If I had a time machine, I would have just burned up a credit card a bit more, and bought them to install when the engine was out, but I was under an extreme time-crunch to get my daily-driver on the road.

Thanks for the details. I'm glad it's working out well overall!

 

[Charlie207]

Thanks for the details. I'm glad it's working out well overall!

I'd honestly love to do another engine rebuild, but don't have anything to put it in. But, before I do that I need a garage & space to work.

 

[Geotrash]

I'd honestly love to do another engine rebuild, but don't have anything to put it in. But, before I do that I need a garage & space to work.

Yeah, it was pretty impressive grit to have done that work outdoors and away from where you normally store your tools.

I've had a similar thought - it would be awesome to do a full engine and transmission workup on the bench and have it ready for when one of our Yukons needs it, but I haven't had either the time or the storage space to do so.

 

[SpareParts]

What door pins/bushings are people using?
I do not see a listing for them on Cunningham Machine and i don't want to install Doorman.
Going on the buddies 2008 Yukon XL.