Many of us run that option. It's somewhat related to safety, mostly related to emissions. It's not a dangerous mod in and of itself, it just lets you push it further which is of course your goal.
beat me to it by a minute
on a off the shelf 93 octane map, would disabling the EGT protect give you more boost up top?
It's in the name. EGT = Exhaust gas temperature. If it gets too high, the max turbo ratio gets reduced. This disables that, much like other changes to remove factory boost limits. It gives you more boost up top, exactly right. However, it may end up being a little too much on the top where you'll hit max fuel pump, and all you have to do from there is reduce it a few points in the aircharge limit table at the RPM you see it tap out at.
Sorry, I didn't write that end quite right. Haven't slept much, lol. Actually physically adding boost does make a higher air charge. However, the ECU is in search of air charge and not boost. The PSI it needs to attain the actual physical aircharge can vary wildly based on altitude and intake temps. XXX% aircharge doesn't always equal XX.Xpsi of boost. The ECU may not need extra boost to get it to a certain aircharge, and other days it might. Proper tuning is done by aircharge and knowing that your boost is entirely variable and just a means to get the aircharge you want.
That's possible if you pushed the absolute shit out of it. If you were tracking it I wouldn't use this on a stock cat. High flow should be fine if the materials arent trash.
Oh shit. I would've never known that. How strange.. what use would there be for a modeled cat temp and not measured since cat temp isnt an input? Not to mention that it can physically degrade and that model wouldn't be accurate?
Also needs to be said: valve overlap/cam phasing affects the air charge actually making it into the cylinder. You can see all the boost in the world and if the cam phasing is using more overlap the charge boost will just be bled off in the cylinder.
Very good info. I'm still learning the actual physics of cams and how it applies to aircharge tuning so I didn't want to comment on that yet, but this is how I understand it too. You can make more air charge through more than just adding PSI. Too many people focus on that number, and it's even more useless in our cars.
Would the circumstances be any different with an aftermarket high flow cat instead of the stock one?(which I believe has 2 cats in it)
High flow will be OK. He said 'stock cat', not 'stock downpipe'. The difference is massive in terms of how much air it lets through. And again, it will only matter in race scenarios. No way you'll be able to build up enough heat to melt the stock cat outside of a track, even on a highway (due to airflow).. unless you're doing some REALLY crazy shit.
