NoMercy Z06

I haven't been able to mimic the hard shudder like Mike has but I do have a small lope at around 950 rpm with 2% throttle. Nick I have a video that I will email you here in a bit. I still have a slight bucking issue. It's always around 1150-1250 rpm at very light throttle input and low boost just maintaining speed. Say I'm cruising along at 55mph and I approach a gradual incline and don't give it throttle, when the rpm drops into the rpm range mentioned above it will start to buck. It will stop once it down shifts or the second I give it more throttle. I have been all over the place with timing settings and it made no difference which is why I asked earlier how the quad managed timing below the 1500 rpm setting. It does seem that all of us with this issue has larger injectors.

Nick, How does the quad balance timing below 1500rpm? If I set my 1500 rpm timing to 15.5* there are times below 1400 rpm that my timing will be .5 to 1* above stock timing. If I set my 1500 rpm timing to 14.5 it will have my timing .5 to 1* below stock timing. The reason I mention 1400 rpm is because that's where it seams the 1500 rpm setting starts to take effect. I can actually see higher timing below 1400 rpm. In other words lets say my 1500 rpm timing is set at 15*. It might be 16.21* at 1200rpm, 16.74* at 1300rpm and then when it approaches 1400 rpm it starts to drop timing and my be at 15.75*, so I assume around 1400rpm is where the 1500 rpm timing setting starts to take over. Most of my light bucking issue is sub 1300 rpm. It doesn't do it on the stock setting though. As it turns out I'm still seeing the issue after the new tune.

Haven't had a whole lot of time on the new tune yet but it does feel better so far.

I'll download it later tonight and give it a test tomorrow. Is that a complete tune or will my tunes upload to that profile?

This is an interesting topic. I posted over in the CF that I had some very light bucking at very low throttle input as well. Mine is more like cam lope than what it sounds like Mike's is doing. As I was pulling down fueling down low to get the smoke out with my injectors which i had gotten down to 85% my truck would actually die with a slight touch of the throttle, sub 5% when pulling out of a parking spot. I brought the fueling back up and the truck hasn't died since but it will still buck a little. I started pulling timing to get rid of the bucking but it didn't seem to help much. I got down to 13* @ 1500 and 16* @ 2000 and it didn't seem to improve any, also pulled light throttle advance down to 0*. As I flipped back and forth between stock setting I noticed that my tunes were now running as much as 2.5* behind where stock was running. I raised the timing back up to match closer to stock in the sub 2000 rpm range. Again not much changed the very slight bucking that I could feel at very low throttle input. I can't feel the bucking in stock setting either. I'm beginning to think that the bucking while driving down the road is actually drive-train lash as it's loping. Now this brings me to my question, is it possible that this smoothing setting needs slight adjustments based on the size injectors we have?