About the surprise after removing the exhaust valve fuse, it's not just the sound.

[SaVitar]

About the surprise after removing the exhaust valve fuse, it's not just the sound. After removing the fuse, the exhaust valve is fully open every day. I was pleasantly surprised to find that the problems that bothered me before disappeared, the instrument panel no longer makes abnormal noises, and the engine does not vibrate so much. Before 4000 revolutions, the instrument panel would beep and the engine vibrated obviously. I guess it was because the computer controlled the valve to open after 4000 revolutions, which caused the engine to be unable to completely exhaust the vibration caused by the gas, which affected everything in the car. . Now everything is smooth and the revs are picking up pretty fast. If you also have this problem, trust me, unplug the fuse of the exhaust valve. will solve these problems.

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[dminus]

this is dope! thanks for the info friend!

 

[TypeRD]

Here’s the original fuse pull thread by Topher: https://www.civicxi.com/forum/threa...ulled-always-open-exterior-sound-clips.51819/

It has been speculated that the valve is there to provide some back pressure during start-up and low idle. Read in this thread. AWE did some in-depth R&D. The valve activates based on throttle %. https://www.civicxi.com/forum/threa...e-for-the-honda-fl5-civic-type-r.52308/page-3

I put my fuse back in after running it for months without the fuse, as I really find zero difference in overall performance nor sound. It has a little more low grumble on startup, but that’s about all. I am not an exhaust expert, but if Honda feels some back pressure is needed, then there’s likely a good reason.

Without enough back pressure, I think it’s possible to gunk up the catalytic converter sooner than later. Again, this is speculation. I suggest trying it for a few weeks without the fuse, then put the fuse back and see what you think.

 

[sashimi]

Here’s the original fuse pull thread by Topher: https://www.civicxi.com/forum/threa...ulled-always-open-exterior-sound-clips.51819/

It has been speculated that the valve is there to provide some back pressure during start-up and low idle. Read in this thread. AWE did some in-depth R&D. The valve activates based on throttle %. https://www.civicxi.com/forum/threa...e-for-the-honda-fl5-civic-type-r.52308/page-3

I put my fuse back in after running it for months without the fuse, as I really find zero difference in overall performance nor sound. It has a little more low grumble on startup, but that’s about all. I am not an exhaust expert, but if Honda feels some back pressure is needed, then there’s likely a good reason.

Without enough back pressure, I think it’s possible to gunk up the catalytic converter sooner than later. Again, this is speculation. I suggest trying it for a few weeks without the fuse, then put the fuse back and see what you think.

One thing is for sure, the car is just much easier to operate with the valve functioning as intended. The hesitations, and gutless low end was not a good look with the fuse pull.

 

[Jester04]

One thing is for sure, the car is just much easier to operate with the valve functioning as intended. The hesitations, and gutless low end was not a good look with the fuse pull.

That is weird, I have not experienced any of that with the valve open. 0 hesitation and no loss of power.

 

[Jester04]

Here’s the original fuse pull thread by Topher: https://www.civicxi.com/forum/threa...ulled-always-open-exterior-sound-clips.51819/

It has been speculated that the valve is there to provide some back pressure during start-up and low idle. Read in this thread. AWE did some in-depth R&D. The valve activates based on throttle %. https://www.civicxi.com/forum/threa...e-for-the-honda-fl5-civic-type-r.52308/page-3

I put my fuse back in after running it for months without the fuse, as I really find zero difference in overall performance nor sound. It has a little more low grumble on startup, but that’s about all. I am not an exhaust expert, but if Honda feels some back pressure is needed, then there’s likely a good reason.

Without enough back pressure, I think it’s possible to gunk up the catalytic converter sooner than later. Again, this is speculation. I suggest trying it for a few weeks without the fuse, then put the fuse back and see what you think.

On turbo cars you can’t really run out of back pressure since the turbo acts as the restriction. Its the smallest part in the whole system. So after that it really does not matter in any way aside from a very small drop in low down torque in the extremely low rpms.

 

[TypeRD]

Interesting and makes sense. Thanks for that @Jester04

 

[Jester04]

Interesting and makes sense. Thanks for that @Jester04

No problem dude, and as far as catalytic converters, they warm up quickly without the need for back pressure due to the car starting cold startup sequence. The car leans the mixture and retards timing a lot to build up heat into the cat to get it to operating temps faster for it to work. Catalytic converters need to be at a certain temperature to actually work. That is why on startup car tend to rev a little higher and sound different and then the rpms drop down after warmup and sound tone changes due to ignition advance.

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