Exhaust Valve Mod Vs Sport Throttle

[jwilliams]

Ho guys. Iv looked and looked and all i get is an answer that i am not looking for.

The exhaust mods make the valves stay open.

Sport or sport plus throttle mode also keeps the valves open.

So what exactly is the point of the mod then?

Just to keep them open even in efficiency? Or is it that even in sport plus etc at lower revs the valves still open and close somewhat?

Thanks for any answers. Its been on my mind since i bought my car.

[Blindside_137]

Yes it is to keep them open all the time.

To my knowledge even in sport settings the valves would be closed at cruising and then only open when a certain amount of throttle is applied.

[EdgeCrusher]

I'm not sure which mod you are referring to. but I just put a valve controller on my car today. What it did was it allows me to keep my valves open or in Auto mode regardless of what my settings are. Usually in Sport or Sport + mode the valves are open but the throttle is super sensitive.

Now with the valve controller I can keep all my settings in "efficient mode" and have my exhaust valves open, So I can get the sound with out the response of the throttle being so hard and quick.

[jwilliams]

Thanks guys. That is what i assumed. That the valves can stay open even in efficient. But i don't really see the point in using my car in efficient. I bought it as its aggressive etc. That is why i asked as i find the valve mod or controller sort of useless, unless the valves in sport etc don't stay open constant and close on cruising like blindside mentioned.

Anyone else that can shed some light on how the sport modes control the valves.

[Wah]

Originally Posted by jordon335

Thanks guys. That is what i assumed. That the valves can stay open even in efficient. But i don't really see the point in using my car in efficient. I bought it as its aggressive etc. That is why i asked as i find the valve mod or controller sort of useless, unless the valves in sport etc don't stay open constant and close on cruising like blindside mentioned.

Anyone else that can shed some light on how the sport modes control the valves.

The biggest difference I hear with the valve mod is during a cold start, which used to sound like a lawnmower. Now with the valves open during the start, the car has a throatier sound, and is much louder. I can also hear a difference during downshifts... the throttle blips are louder. It was something I missed from my E92 M3. I thought it was gone from the M4, but after doing the mod, downshifting is so much more fun.

One other thing, which isn't so great, is a slight drone in 7th, on the highway. Not enough to make me plug them back in, though.

[SakhirM4]

Originally Posted by Wah

One other thing, which isn't so great, is a slight drone in 7th, on the highway. Not enough to make me plug them back in, though.

So it would be fine on a 6MT

[Wah]

Originally Posted by SakhirM4

So it would be fine on a 6MT

Yeah, slower cars generally don't drone as much.

[SakhirM4]

Originally Posted by Wah

Yeah, slower cars generally don't drone as much.

Hey!! My car is not slower - only the driver is

[Black Gold]

The valves are not open all the time on sport or sport plus

The oem exhaust valve mod sounds completely different and way better than with them connected

I think it completely changes the car for the better. I went from open to auto modes for a service appointment and the car sounded awful to my ears in comparison.

Below 2500 rpm it's completely different, nothing alike.

[AlterZgo]

Originally Posted by KennyPowers

The valves are not open all the time on sport or sport plus

The oem exhaust valve mod sounds completely different and way better than with them connected

I think it completely changes the car for the better. I went from open to auto modes for a service appointment and the car sounded awful to my ears in comparison.

Below 2500 rpm it's completely different, nothing alike.

This.

The constant opening and closing of the exhaust flapper in sport and sport+ is very annoying. Hate it when car sounds good and loud, then all of a sudden turns into a Toyota Camry at a certain RPM simply to quiet some minor perceived drone.

I now use the Burger can flap module and run with valves open almost all the time.

[Blindside_137]

Originally Posted by jordon335

Thanks guys. That is what i assumed. That the valves can stay open even in efficient. But i don't really see the point in using my car in efficient. I bought it as its aggressive etc. That is why i asked as i find the valve mod or controller sort of useless, unless the valves in sport etc don't stay open constant and close on cruising like blindside mentioned.

Anyone else that can shed some light on how the sport modes control the valves.

Some people might always want the exhaust loud, but prefer the steering or throttle in efficient. Some say that just because a setting is more aggressive doesn't make it "better"

[achi 3.0]

In sport or sport+ the valves are not allways Open! You could see it If you Drive behind the car

[WVUDrJay]

I have the 279 dollar burger can flap. Sounds better and louder IMO than stock but it's not a 3000-5000 dollar exhaust and I can turn on and off when I want. I'm sure the other exhausts sound better or more exotic but I was not ready to shell that kind of cash out.

[Millie1]

Originally Posted by WVUDrJay

I have the 279 dollar burger can flap. Sounds better and louder IMO than stock but it's not a 3000-5000 dollar exhaust and I can turn on and off when I want. I'm sure the other exhausts sound better or more exotic but I was not ready to shell that kind of cash out.

+1

[CanAutM3]

There are quite few threads on the topic...

From the Sound and Exhaust System Deep Dive & Interview:

For instance, if you select the COMFORT mode, the exhaust valves are fully closed in the lower revs ranges. If there is a greater load demand at higher engine speeds, they open up. When driving with a constant load in COMFORT mode, the valves generally remain closed to achieve a maximum level of everyday comfort over long distances.

In SPORT and SPORT PLUS modes, other engine characteristics are selected for controlling the exhaust valves. At lower gears, the exhaust valves are always open, while when higher gears are selected under constant driving conditions, they are closed; however, if the load conditions change accordingly, they open up in a flash. There are also ranges in which we have chosen to close the valves, for instance at low engine speeds in high gears. In these ranges, which are frequently selected in the automatic mode of the M DKG Drivelogic for driving at maximum efficiency, the exhaust tract in turbo engines would have a tendency to drone if there were no damping.

[jwilliams]

Trust me a searched but the search engine on here is very flawed and brings up such things as "1200 miles break in service" when searching "exhaust vlave mod". So no wonder people go off the idea. Thanks for the copy and paste though. It makes sense.

So basically in the lower gears the valves stay fully open regardless of revs so unless on a motorway or bypass you would never really hear the difference.

[Black Gold]

Originally Posted by jordon335;[/quote

So basically in the lower gears the valves stay fully open regardless of revs so unless on a motorway or bypass you would never really hear the difference.

No. It's completely different. Simply take 5 minutes and unplug the valves and see for yourself. It is a huge difference regardless of mode

I can tell you for a fact they aren't open in sports plus al low rpm in any gear with valves connected.

[Cameronc08]

So before I go ahead and unplug the valve module, I want to make sure I'm understanding this 100% correctly. Basically it keeps the car exhaust in 'cold start' mode at all times, yes? I always enjoy the first minute or two of driving my car because of the cold start, then, even in sport plus, I feel it gets way too quiet cruising around. This seems like the answer. Also, does keeping the valves open at all times have any other ill effects on the car, or is it simply just a noise factor? Thanks.

[Pauly Walnuts]

Threads like this make me depressed.. There are way too many people with more money than common sense.

[RJVIII]

Originally Posted by Pauly Walnuts

Threads like this make me depressed.. There are way too many people with more money than common sense.

[Hobbination]

Just unplug them, use some wide sticky tape (100mph tape we call it) and half plug them back in, but not "connected" wrap the tape around and it will seal up solid. No dangling wires. It's free and very worth it.

[s2kdagjd]

So anyone have a straight answer to this?

Sport or sport + = valves open all the time once gas is pressed?