So I've gone through quite the ordeal with Sxth and their tune options for our cars, and frankly, I do not recommend buying their ECU/TCU tunes, and warn anyone to take serious caution about trying their new user mapping tool option they're about to launch.
I'll start off with my experience with their tcu tune:
- Purchased their stage 2 beta tune, and noticed that the shift points weren't lowered as they claimed they were on the tune (shifting at the stock 6.7k rpm).
- Received a revised file that helped lower the shift points, but were down to 6.2k-6.4k rpm, when they claimed it was supposed to shift at 5.9k. Also, the 3-4 gear shift was still shifting at 6.7k. I also noticed that it was only triggering stock launch control.
- Received a second revision of their tcu, which fixed the stock launch control, but still didn't fix the lazy 3-4 gear shift. Asked for another revision, but this was when Nathan went for surgery, so I waited until he recovered.
- After he was supposed to come back, I followed up with this request for a third revision for a lower shift point closer to the 5.9k rpm target he initially said. They tell me a new revision was added, but this time they charge me for this revision (the stage 2 + low rpm shifting file some of you see).
- After loading this tune, I try it, and it's basically the first revision I listed above (6.2k rpm shifts with a lazy 3-4 gear shift, and stock launch control). I report the issues back to Sxth, and they opt to tell me they're having issues with getting launch control to work, which is odd since it was working just fine on my second revised file I mentioned above. I point this out to them, which results in them asking which file this launch control was on (which, again, is odd imo). I tell them the file version it was working on, and they have now ghosted me on fixing this tune even after following up with them.
For the ECU, I'll spare you the details, but I've basically been stuck with a middle of the pack tune power wise that cannot idle properly (it sounds like I added cams to my car because it's swinging heavily on ignition timings and rpms). This may be something that could be addressed with more revisions, but this is from starting with trying to get the car to idle without throwing a CEL to begin with, and after 4-5 revisions on their ECU tune, so I frankly gave up with getting it to work properly.
Now for those who think it may be my car that's the issue, I also have an ECU tune from both Lozic and Lap3, as well as a Lozic TCU tune, and they are all working perfectly fine. I opted to try sxth out when they announced their ek1 tune options because I liked the idea of being able to create a customized tune, but I wish I hadn't at this point, and frankly, I feel the customization option is more so for troubleshooting instead of fine tuning.