i find myself going blind reading repetitive arguments on this thread, and still have a problem getting basic definitions.
when i see "boost cut", it makes me think of the wastegate opening either longer or sooner than normal to prevent boost. the way im reading the rest of the posts, however, it makes me think that ppl mean it's creating more boost while not compensating by adding more fuel. the reason i think that is because i keep reading "boost cut...engine blowup". and if the boost is cutting (cut by definition meaning taking away), and the fuel doesn't compensate, then all that should happen is you get too much fuel. and that's not going to damage the engine in the same fashion taht a lean mixture would. in fact, it would probvably end up stalling
and as for why this "boost cut" is happening in cold weather, it probably has to do with preventing too much power output from the engine. cuz colder temps means denser air, which in turn means more fuel added, which in turn means more power. and i don't see anything wrong with mazda trying to prevent their car from outputting too much power, it aides in engine life.
and as for turbos working better in cold weather, ummm...what? if anything makes a turbo work better it's replacing the oil (unless it's ball-bearing or something along those lines). cold weather is going to make the oil sludge around, and that would end up hurting the turbocharger more if it's spooling up w/out getting the oil it needs to lubricate everything properly.
Let me give you the history on this that only the old timers on the forums will know.
Last Winter - Most of us where running MBC/BCD at best. The only person I know that was running a CPE SB was Laloosh (prior to that he had a MBC/BCD).
So what started happening was that those in cold weather who where running right started to get cut in cold weather. This was not not BOOST Cut as some think, but a heavy stutter that forces you from fear to let off the gas. So everyone spent all kinds of time to try and figure out the issue.
This is where Laloosh in all his stupidity blamed CPE and their SB and sold all his CPE parts and got banned from all the forums due to his verbally slamming CPE every chance he got. This is also where the Coil Spring Stretch was born as well as the Fuel Pump being the cause of stuttering.
Everyone tried plugs, coils spring stretch, MrGuy designed the CDFP fix but NOTHING fixed this issue. Then CPE determined the cut was from the IAT being out of whack below 40degs for some reason and the ECU was cutting due to it. However, the fix required you to have to cut wires and such. Then spring came and people forgot about the cold weather cut.
So here we are now, winter again and guess what? The Cut is back, the CDFP didn't fix it and we're back to square one. However, both CPE and Cobb found the issue over the summer and now we have a fix. CPE completely removed the issue and Cobb just raised the cut limit higher.
Now is the Cold Weather cut a safety feature? I have no clue. CPE has not said nor has Cobb (though Cobb as said they left it in as a safety precaution).
Boost Cut is NOT the same thing. However boost cut, like a rev limiter, is there to save your engine. Boost Cut will not hurt anything nor will bouncing a rev limiter. You don't want to make a habit of hitting it, but it's there to save you. The cold weather cut is something else I believe. I'm not sure if I have ever had the cut but if I have then it's nothing more than a heavy stutter like a very heavy misfire (Those that have had the cut can chime in here if it's something different).
I hope that answers your questions?
