2008 GMC SD 6.2 AWD knock in 2-3 gear WOT

[sonofthunder9]

Hey guys! I have a 4 degree KR in 2-3 gear @WOT. used gasredux to make recommended adjustment. swapped gas brand, BP to Shell, both 93, on Diablo Tune. Truck is 2008 GMC SD CC AWD L92. Anyway to get rid of this?

[06MonteSS]

don't use shell.. shell is crap gas and tends to cause a lot of knock retard in every single data log I've ever seen from people that use shell, and that's thousands..

mobil, exxon, sunoco, amoco, bp, chevron are your best choices.. with mobile and exxon being the best..

[Mike_Levy]

I've been having pretty decent luck with Citgo as well. Only place I can get E85 is a Citgo station, so when I make my concoctions, I use their 93 too. I do get some timing being pulled, but only under extremely high boost (20psi+).

[sonofthunder9]

Okay. I will try different one and get back with updates. Thanks for the quick reply.

[sonofthunder9]

So I got exxon gas. I am about 175 miles in on new gas, 93 still. Still have this Knock issue. Even though its about 4* its more pronounced in the engine sound. Slight dip in power, then after the shift to 3rd, hold on cuz truck opens like a beast. I have posted a couple of logs and csv files. More info on truck is Air Raid MIT, new plugs and wires prior to tune, ac delco iridiums, stock delco wires, optima yellow as main battery, blue as aux.
GH file is steady 2000rpm, I file has more WOT runs. Any help would be appreciated.

[mikel]

Have you by chance logged the stock tune?

[sonofthunder9]

Unfortunately I did not log the stock tune. Only have the first log of a diablotune.