Not to take over your thread at all. I remember a while back Matt dispelled myths with another tuner on the raptor forum and since then he’s been one of the few I trust. I did find the post he made which made me proud to be Gearhead tuned on my 18 raptor and 11 F150.
Here it is:
You want to go there? Okay let's go there. Let's dispel some myths on a few subjects. I will address pump gas tuning here, because we all know using higher E blends makes it easy to produce big power safely......
You talk about heat soak. The biggest contributor to heat soak is ELEVATED BOOST! When we tuned the first raptor back in 2017 we had lots of experience on the ecoboost platform previously and we tested our raptor for a 6 months before ever releasing to the public. We quickly found that the turbos would reach their design speed limit of 220000 rpms very quickly so we stopped boost there and thus the reason we limit boost at that level first and foremost. Timing actually keeps things cooler in boost so your cats don't cook as we actually measured cat midbed temps on the dyno to verify this is true. Lots of boost and no timing = hot cats! You even melt a cat? It is easy to do.
Obviously you don't understand how our auto octane feature works. It is a similar way to the way the factory does it (but different at the same time) and takes months of development to make it work like ours does. Instead of just running the same boost all the time no matter what the inferred octane is, our calibrations will run full boost on 93 octane (actually 91) but if it can't run enough timing it will ratchet back the max allowed load somewhere between stock and the premium fuel levels to save the cats. It doesn't ride the knock sensors like you are insinuating. Our calibrations will be + or - 2 degrees at all times on the KR activity but sometimes the knock sensors add more over the base calibrations where the trucks are detonation prone. Once the "long term timing trim" also known as OAR adjusts for inferred octane, the calibration automatically changes the maximum boost allowed. This gives maximum safety for anyone running our calibrations even if you think you are getting premium fuel and the station owner is cheating when they have a few hundred gallons of cheap stuff left and just dump it in their premium tanks.....
Even with the auto octane features we employ, we even felt the need to improve intake temperature compensations so that when you sit in traffic and gouge on the loud pedal you don't get crazy KR before the intercooler has a chance to do its job. We spent a whole lot of time working on the base calibration behind the scenes before we even started going for max power. This way the customer ends up with a reliable, fun truck that they don't have to watch their data screen on their tuner like a hawk the whole time they are driving. Also the customer won't have turbos that die a premature death from constantly being overspeed at wot from running too much boost....
Matt
www.ghtuning.com
