The Lap3 Uncle chip has three settings that were originally, Optima/Sonata 2.0T recommended dependent upon octane. 93 octane was 666, 91 octane was 755 & 89 was 744. This was on the 2.0T that would pull timing & run on 87 octane. There were issues w/some on the 666 setting. To the point where claims were made that the petrol in Korea was of higher quality than that in the states.
The 666 setting, again originally 2011-2015 Optima/Sonata 2.0T, was then shunned by the Korean Auto Tuners Ass., available on FB if you are so of mind w/that format, for 93 octane on 755, 91 octane on 744.
Another twist and the new & improved 666, allegedly out of Korea, is 655. I've read on this forum a gent claiming to be in Korea running 677 that I believe was w/Stinger.
The first setting, all three trimmers are alike though numbered 1, 2, 3, is either 6 or 7. That's the intake temp sensor. The last two settings are always in pairs. 44/55/66 because they each correspond/intercept a pressure sensor. One is the MAP1 the other MAP2 or boost or TIP or however you wish to express the MAP sensor w/IAT sensor combo on the charge pipe.
They need to stay in sync even as they manipulate the Voltage signal for more boost. As you increase boost you need more octane, but you can run 93 on the lower chip settings. Lap3 sold the chip in Korea. K5 sold the chip in the states. Lap3 USA has no interest in the Uncle chip.
Even for a piggyback chip they divulge precious little information about the settings and their functions. I've corresponded w/both K5 and Lap3 USA in attempt to understand the differences in the first setting, the intake air temp, of 6 & 7. Crickets. The reason being as I'm using an Uncle chip on the lowest setting 744 & wondered if I could run 644 as long as I continued 93 octane.
I want as much fuel on the front end as possible before being adjusted on the arse end w/couple of O2 sensors. The IAT signal will enrich at colder temps. This should allow for more advance timing. So, what differences entail changing the first number of the three digit setting from 6 to 7/7 to 6?
I only wish to keep from grenading the old gal whilst picking up a wee bit of power. Most impressive on the lowest setting to me was the additional torque. So, me delima is none will share the result/differences in the 6 & 7 setting. The only setting starting w/6 is the highest power setting. That only leaves more gas on the front end, than the 7 setting, or more timing or more gas & timing.
It isn't Coca-Cola's secret original, minus cocaine, recipe fer cryin' out loud. And the Uncle chip is a one size fits all Hyundai/Kia turbo/2-MAP sensors w/one incorporating IAT or so it seems. The old Uncle chip is more than a simple IAT resistor hack, but it isn't the pro version or an ECU.
It's old, dated and for the life of me I cannot fathom why they wouldn't share setting information that could impact longevity.
The dealio, at least on the original/older/larger Optima/Sonata 2.0 turbo, is 17.4psi stock. I only wish to shove the lower setting down 'er gullet and even then I'm looking at over 20psi at sea level.
So, anyone that could help on the IAT setting would be appreciated.
ETA: It seems silly because were I running at say 40* ambient temp it would be a moot point. But, summer is coming on & I'd like a stab at a semi-intelligent guess running in high 90's-low triple digit temps & heavy humidity.
As potential purchasers wouldn't you wish to know the difference in a 655 & 755 setting?
