Had to be a rice-guy and try unplugging the exhaust valve in hopes it would stay open for more sound. Which it does. But the car is smarter than that. No CEL, but you get a reduced power message
If someone swapped the entire exhaust system and put a straight pipe. You wouldn’t have a way to connect that wire back unless you tricked it. That’s the safety mechanism.
The brochures probably state RPM based positioning because people know what RPM and speeds are. But it makes more sense to me that it’s based on load because essentially all calculations are based on that number.
you can unplug the valve vs take it all out. I haven’t thrown a code or received “reduced engine power” messages like some may have. A bit more rumble under 4K now. I like it but sound is very subjective and others may not like the additional exhaust note.
I ran it unplugged a while and it became a bit unbearable. Constant booming in the cabin unless a little bit of load applied. I think it generated a few interior trim rattles lol. But didn't throw any codes. Only tried it for a day.
it would be cool if there was a 'table' for the valve operation accessible to tuners. basically change the operation so as soon as you go WOT the value opens regardless of speed or engine RPM.
Sorry to reply to a thread a few months late but was curious if after you plugged it back in the error message went away on its own?
I was thinking of unplugging mine to see how it sounds but don’t have my code reader with me and don’t want to go to a dealership if I can help it. Lol
I unplugged mine, and it sounds amazing. It ran with no error code for one day, and then popped up with "reduced power, bring to dealer" warning. When I plugged it back in and restarted the car the error went away. It certainly did not feel like a lack of power, and made the same boost as normal, but the warning message is consistent and very annoying.
If left unplugged an error message will show up on the dash. If driven normally and left unplugged no error messages show up. But once you do a full pull you will get one. Or so I've heard? It's open 80% of the time anyway. I don't know why it even has a valve. I could see if it stayed shut until 1/2 to full throttle. Or stayed shut in eco and normal. But it's pretty much open all the time. I removed my valve and used a screw to hold it open 2nd day of ownership.
pretty sure the valve is closed most of the time. It is only open at idle-20mph then it closes. It does not open back up until you reach 4500rpm or WOT(Wide open throttle/ full throttle).
I don't know if it's just me but I love the drone with it unplugged. It isn't terrible but also is nice to plug back in. The Supras have a thing you can plug in to trick the computer into thinking the valve is working. Is the GRCs valve plug similar? I would love to have that option for more noise...
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