after weeks of non stop action i finally got my 5.3 single turbo 2001 gmc sierra up and running. had some throttle hang issues at first but changed the iac valve and then it didn't want to idle at all. looked over some other peoples tunes and changed some things (even adjusted the throttle stop screw a tiny bit) she idles half assed now. a little high but it doesn't die. took it for a quick ride and it drives alright but as soon as you get into throttle it just feels like youre maybe half throttle and not trying to go fast. this is my first ls powered vehicle and first time touching a tuner. could one or some of you awesome people give my data log and tune a quick peak and give me some input. thanks a ton, couldnt have made it here without this forum!

 

Remove the 1 bar MAP channel, you can't see boost unless you replace it with the 2 or 3 bar MAP channel.

What MAP sensor are you running?? The wrong settings will cause poor starting and running.

Not sure where you got that timing curve from, probably sloppy mechanics. It looks horrible. You are better off with a stock timing curve that will slope down into your desired timing that having a stair step timing can leave part throttle/cruise timing a lot to be desired.

I'm not driving it so I can't feel what you feel. And without seeing the real time fueling or knowing how much boost it's running it's hard to say much else.

For sure going full throttle should not even be on your radar if you want to keep it together. Getting fueling 100% under control using a wideband should be done for part throttle first, then work your way into boost.

 

Cobalt ss 2 bar map. And okay no more getting into throttle 😬

 

I don't have those settings in front on me but make sure the linear and offset settings in the calibration match that sensor.

You can also do a test with the key on engine off and see what the MAP is reading. If say you live at sea level and it's a "good" day with low humidity the KPA should be around 100ish. The map KPA with the KOEO should be really close to where you live if what I'm getting at. It shouldn't read 90kpa if you lived at sea level or 107kpa type of thing.

 

Just decided to take it to a place to have tuned instead of messing around lol.