I agree with 202mphbusa that a dyno tune should be better than a flash. They both change stock fueling to accommodate air intake but a flash tune was made from some other bike on some other day with similar mods but not necessarily the same. If you compare a DJ map to a flash, the flash map has at least twice as many cells (like the stock map has) so the fuel corrections are made in finer increments...although a PC5 will average out the values between cells to achieve a similar effect. I've been told the difference in fueling requirements from one busa to the next with the sam mods are negligible unless you are racing. I had a map from a reputable tuner for an Akrapovich full system in my other bike. I refined it for my Tsukigi exhaust using Autotune and the changes in the cells seemed pretty significant to me. I didn't notice any big change in performance though. This makes me inclined to believe that a generic map is just fine for the average sport/street rider. One way that my custom tune was better was that I was able to go WOT from 2000 rpm in 6th gear and the engine ran smooth even below 3000 rpm. That tells me a custom tune can be better in some ways. For the riding I do, a generic map has been just fine and I tried three of them in the bike mentioned before using Autotune. They all felt more or less the same. For most of us, it's probably a case of being sure the fueling is safe for the engine, not so much a few hp at peak rpm we can't notice.
The fact your tuner is still tuning by DJ instead of flashing gives me pause. He could be the greatest tuner in the world but I don't know of any tuners in the past 8 years who prefer a Power Commander over a flash...unless they flash and use a PC for fueling only which some were doing a few years back. Just saying, if this guy is only using DJ equipment, I'd suspect he's old school and low budget. You can make the decision from there. Old school and low budget doesn't mean, "not good." ...just for $300 you can get a flash from a highly reputable tuner who is using the latest methods. ...and I'm telling you, you probably won't know the difference in fueling anyway if you're honest with yourself. I can't tell.
A custom dyno tune should also adress timing. I think you'll actually notice a difference with the timing restrictions removed. I've heard this is tricky with a busa. I wouldn't let anyone without Hayabus specifc knowledge experiment with timing on my bike.
Also, there's flies. Tuning by PC won't adress flies response.
Then you have the TSL and radiator fan and whatever else a flash does that a Power Commander doesn't.
If I didn't already have a Bazzaz and enjoy messing with electronics, I'd get a flash.
Can a power commander unlock the speed limiter, disable tip over sensor and such?
Check with DJ for busa specific info but on most bikes, If you couple up your PC5 with an Ignition Module, you can disable the TSL as well as enable a two-step launch feature, a pit speed feature and most importantly, adjust timing. I don't know where to find a good PC5 map for timing these days (nobody uses them) but you definitely don't want to guess on adjusting timing unless you know what you're doing and how to do it on a busa. You can also use a PC5 to enable a quickshiter feature.
You can also do many of the things mentioned using an
ECU Editor box from Boost by Smith who is a site sponsor
@smithabusa . ..you just have to figure out how to use the software with your laptop. I'm pretty sure you still need a fuel module if you use ECU Editor. I have yet to mess around with my ECU Editor box for my Gen2. I imagine ECU Editor works with a Gen1 but ask to be sure.
