valentinoamoro
Well-Known Member
- Thread starter
- #1
Hey guys,
I got a Lund tune and after the data log John mentioned I was getting some knock activity. Recommended an octane booster and data log again to eliminate false knock etc.
After I did that and sent the file, he mentioned that its still doing it - but much better than before, specifically, pulling less than a degree so seeing 'commanded spark values'. His theory is the fuel in the Seattle area (91 octane) is not the greatest. Mentioned car is totally fine to drive and suggested octane booster on race days so timing it not pulled.
Driving around I dont hear pinging/marbles in engine sound, at high rpm its impossible to say. Cylinder head temps have stayed within 185-195 like pre-tune days. I dont spend a ton of time above 5000 anyway and short jaunts to redline dont seem to change the oil or cylinder head temps. Oil in catch can is minimal. Idle is good.
Wanted a second opinion here -
>Should I be OK with this? IE, is pulling timing in 91 octane gas normal? Lund mention the tune he provides adjust strategies depending on octane, it doesnt need customization for 91 octane. I assume it does rely on the knock sensor and adjusts timing to a more aggressive profile depending on the data coming in?
>Local drivers - I fuel at the local Arco near me. Have folks had better luck with others or is that all marketing nonsense?
> I can also ask my local shop (Brads Custom) to make adjustments as needed. Is it needed and if so, what parameters could they adjust (ie, pull back timing?).
>Given 91 octane, is the car pulling timing back to the point where the tune is not really going to help me unless I boost octane? It feels more responsive, but so much of that could be placebo. The car is damn fast regardless and always has been. Still, had the mod itch. Always have. :-)
Cheers
I got a Lund tune and after the data log John mentioned I was getting some knock activity. Recommended an octane booster and data log again to eliminate false knock etc.
After I did that and sent the file, he mentioned that its still doing it - but much better than before, specifically, pulling less than a degree so seeing 'commanded spark values'. His theory is the fuel in the Seattle area (91 octane) is not the greatest. Mentioned car is totally fine to drive and suggested octane booster on race days so timing it not pulled.
Driving around I dont hear pinging/marbles in engine sound, at high rpm its impossible to say. Cylinder head temps have stayed within 185-195 like pre-tune days. I dont spend a ton of time above 5000 anyway and short jaunts to redline dont seem to change the oil or cylinder head temps. Oil in catch can is minimal. Idle is good.
Wanted a second opinion here -
>Should I be OK with this? IE, is pulling timing in 91 octane gas normal? Lund mention the tune he provides adjust strategies depending on octane, it doesnt need customization for 91 octane. I assume it does rely on the knock sensor and adjusts timing to a more aggressive profile depending on the data coming in?
>Local drivers - I fuel at the local Arco near me. Have folks had better luck with others or is that all marketing nonsense?
> I can also ask my local shop (Brads Custom) to make adjustments as needed. Is it needed and if so, what parameters could they adjust (ie, pull back timing?).
>Given 91 octane, is the car pulling timing back to the point where the tune is not really going to help me unless I boost octane? It feels more responsive, but so much of that could be placebo. The car is damn fast regardless and always has been. Still, had the mod itch. Always have. :-)
Cheers
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