Nice build man! Just realized your location, I'm not too far away(crofton area) maybe I'll run in to ya sometime lol

 

Sure thing man, if you ever need some help with a project feel free to ask.

 

Making some good progress with the tune, I can cruise around at a respectable AFR(13.5-14.5) depending on load, grade, TPS etc. For a while I was having an issue with stalling while coming to a stop. After researching a bit and messing with the Throttle Follower/Cracker settings the issue is nearly gone. Next I will begin tuning the shift points, the 4.8 combined with a ZO6 camshaft and a 4L80e leaves MUCH to be desired. The 4.8 simply does not have the low end torque to support the factory low speed shift points. I have attached a spread sheet in which I have outlined purposed shift points that I intend to implement when I get home from work.

After that I will work on the Main spark table, so far I have only made 3lbs of boost but I noticed while looking at the log file that my spark advance was around 30*. I imagine this is much too high, I will need to research further what defines a "safe spark map". If what I have read is correct, 4.8's tend to like more total timing than its larger brothers. Is this a correct assessment?

 

I made some decent progress on the car last night when I got home. It didn't occur to me that a segment swap was necessary on the newer HP tuners v.3.6, this assumption was based on my ability to swap between predefined transmission in the program. Long story short I had not been logging which gear I was in on the scanner, come to find out I was starting in 2nd. I honestly thought that something was amiss with the transmission. I got the segment swap done and now the truck runs like a bat out of hell. No more stalling at stop lights, odd AF ratios off idle, etc.

Progress so far






Now before everyone starts saying my AFR is a bit lean, YOU'RE RIGHT! LOL, I need to adjust the PE to come in sooner and fatten up the BE to make a seamless transition resulting in a safe AFR. I think the spark is pretty safe for a 4.8L, what do you guys think? On a side note I don't think my KR PID is working correctly, does anyone have any tips for setting it up?

 

You need to add spark retard (or knock retard, whatever its called) to the channel list to use in the graph and table.

 

PE afr should be 12.5 and BE should be what you want at full boost.

 

Will do, thank you Atomic. I haven't heard any rattling to indicate a knock so far thankfully.

 

put it on the dyno the other night, WG spring maxes at 7 psi. I didn't have time to change it out so I ordered a manual controller. Overall I'm pleased that it put down 350hp/350tq at such a low boost level. This is an approximate 18hp per pound of boost increase over stock. I guessing the 4l80e and 3k stall aren't helping the numbers either.

In two weeks when I install the boost controller and ditch the flowmaster exhaust I should be in the 450hp range at 12lbs. To recap, this is a 4.8 truck with an LS6 cam/springs and a small MP turbo. it has excellent street manners and cruises like a dream. Perfect for someone who wants a DD sleeper.

 

called it! I did a run after I pulled the slowmaster exhaust off and it picked up 30rwhp. This is the final result at 12# of boost.