Turbos = Witchcraft
Join Date: Jul 2011
Location: West Bend, WI
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IMO, there is really no performance gain to using a 58V over a 48V, particularily if your FICM is tuned. The 58V would cause the injector to open slighlty faster, in effect advancing the timing ever so slightly. I can't think of anyone who has done a direct comparison of a good 48V vs. a good 58V to see a difference. Generally you sdon't replace the FICM until it is losing voltage, so the most people can usually say is their truck feels stronger after they replaced their failing 48V with a new 58V... duh...
If you have ever talked to Ed at FICMRepair.com, you know that he is opposed to using any kind of higher voltage FICM. In my experience, I have found Ed to be one of the most knowledgeable people when it comes to FICMs. Here is an exerpt from his homepage that pretty much tells you his opinion:
There are other FICM repair options that talk about the benefits of upgrading the voltage on your FICM. In fact, following consumer demand, we used to offer these voltage upgrades as well. What we've learned over time, though, is that it is just a bad idea. These modules get hot enough as a result of sitting atop the engine - stressing them further by adding additional heat is just not a recipe for success.
Though we've seen just a few failures post-upgrade, a few is a few too many. Do yourself a favor and skip the upgrade. If you are having issues with injector stiction (the sticking of injectors when the engine is cold), consider migrating to a 10W30 or, better yet, a 5W40 synthetic oil instead of changing the voltage on these units. Interestingly enough, the injectors are driven by oil in the 6.0 design. Keeping the lightest weight of oil possible along with keeping it regularly changed will go a long way towards engine longevity
Just food for thought.