If you know the risk you also know what to look for when using meth heavy. Torrie was so good when I was trying out things with the car being not confident with it and changing things up on the meth setup. Luis knows the time and money I have invested and that is part of the reason I haven't done much with it because the hours have burnt me out on the car.. most tuners just say go and do this and don't explain to the new kids, things to watch. Things to monitor, and lastly common sense of the system.. with all these videos of people wanting follows maybe make one on meth and Maintenence.
Meth is great for cooling/cleaning, not a fan for aux fueling however. Too many variables that Matt outlined.
That is the difference in my mind. A normal kit for cooling/cleaning and a bump in power is cool. I should probably have one on my car.
However, when you are adding direct port or more nozzles in a attempt to make up for lack of traditional fueling (which isn't you) I don't feel comfortable about it. I know that was common place back in the day because we didn't have upgraded injectors, HPFP, and LPFP. However there really isn't an excuse anymore. If you cant afford at least the upgraded fuel pumps then you shouldn't be wanting to make bigger power. That is when I draw the line. Using a meth kit as a band aid as a aux fuel system is exactly that, a band aid.
Meth is like nitrous to me. There are many variables on how the systems work. Lose a fuel/meth pump, a fuel solenoid fails, ect bad things happen when the tune is completely dependent on that extra fuel to perform correctly. 9 times out of 10 the upgraded fuel pumps will be less expensive then a melted motor when a aux fuel system component fails. I mean I see used pumps going for a grand on FB groups. I was lucky when I got mine for a extremely fair price with extremely low mileage.
However Andrew you are not the average owner. You are different and your goals are different then the average Joe that wants to save some coin and be completely dependent on meth kit.
Plus side though like how Brad set up my non dependent AO tune is when the meth hits I get probably a easy 30hp bump, but even with meth off or failure, which I had once, the car reacts instantaneous, no concerns this tune will fail my engine. I have the HPFP and the Deatschwerks DW300C LPFP, and I'm keeping the meth. Cleaning and easy HP with no downside. I'm with you on being dependent, to much of a worry for me. but to each their own.
I don't see how the potential failures of a meth system are any different or worse than the myriad of potential failures in a conventional fuel system. If you get a single clogged or stuck injector the results are going to be much, much worse than a meth pump failure.
The opportunity to have a failsafe heavily meth "dependent" tune exists. It just requires a small amount of outside the box thinking to utilize the ECU's functions properly.