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My12 exhaust - can you permanently open the flap? - Page 2 - Engine & Ancilliaries/Gearbox - The Lotus Forums Jump to content


My12 exhaust - can you permanently open the flap?


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I am confused 🙂 

When i start my car (2011 evora s with stock exhaust) I always press the sport mode button after a few seconds and I can instantly hear the exhaust get louder as the valve opens. This is on idle at around 900 rpm.

Does the 2bular operate in a different way from the stock exhaust?

I have a valved 2bular on order so would be good to know what is normal behaviour when I get it fitted. 

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If it is "way too quiet" for your tastes a slight increase in sound won't do.  I would look into a straight pipe option that deletes that muffler.  There is a guy on the US board named Plackslayer tha

Yup, you just have to disconnect the vacuum pipe for the exhaust - est at the valve on the exhaust. Access is through that little plate on the bottom/diffuser on the left side.Don't forget to plug the

I am confused 🙂  When i start my car (2011 evora s with stock exhaust) I always press the sport mode button after a few seconds and I can instantly hear the exhaust get louder as the valve opens.

The valve is in the exhaust - the control system isnt. 2bular valve operation will be exactly the same as oem.

My 2014 car does the same at idle : valve closed in normal mode, open in sports mode.

But the valve closes when revs increase from idle and only re-opens in sports mode around 2300rpm.

 

 

Edited by mik
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On 22/05/2019 at 16:42, mik said:

The valve is in the exhaust - the control system isnt. 2bular valve operation will be exactly the same as oem.

My 2014 car does the same at idle : valve closed in normal mode, open in sports mode.

But the valve closes when revs increase from idle and only re-opens in sports mode around 2300rpm.

 

 

My use of the word valve in my post may have been a bit confusing. As there are a number of places to pull the hose off I was referring to either plugging the hose or the  'valve' nipple, not the actuator valve on the muffler.  Personally I would pull off th hose from both exhaust actuator and from the forward end at the SS line connection and fit a vacuum cap plug into the expose SS line, this method removed the hose from flopping around.   

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Seems a little strange that the valve is closed at low revs. As mentioned previously, I thought it was broken so sent it back. Surely sport should stay open at all times and non sport closed at all times.....

W.

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My 2010 S1 has the long ratio gearbox. At 70 MPH it is doing approx 1850 rpm in 6th gear, at those revs the flap is closed so it is a nice quiet cruise. That may be why they chose to close it until above 2300, with normal motorway speeds in the UK you don't have a droning exhaust.

Craig.

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On 05/06/2019 at 14:04, Craig Red Evora said:

My 2010 S1 has the long ratio gearbox. At 70 MPH it is doing approx 1850 rpm in 6th gear, at those revs the flap is closed so it is a nice quiet cruise. That may be why they chose to close it until above 2300, with normal motorway speeds in the UK you don't have a droning exhaust.

Craig.

Makes sense. 

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  • 1 year later...

I'm dragging up old posts again! Apologies all.

Did anyone try this in the end?

Any downsides?

I much prefer the throttle behaviour in normal but the exhaust noise in sport!

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I also just came across this:

https://www.komo-tec.com/en/lotus-exige/mk3-toyota-v6350380/exhaust/110/rc-exhaust-valve-control?c=495

although it is a bit short on information. I am guessing it includes a new valve actuatator and some wiring (and a plug for the existing vac pipe?) but only a fob is shown (?). 😐

Leave it open all the time, and use this to exercise the valve periodically.....

Have messaged KT to ask, but it’s possible someone on here has already fitted one?

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1 hour ago, mik said:

I also just came across this:

https://www.komo-tec.com/en/lotus-exige/mk3-toyota-v6350380/exhaust/110/rc-exhaust-valve-control?c=495

although it is a bit short on information. I am guessing it includes a new valve actuatator and some wiring (and a plug for the existing vac pipe?) but only a fob is shown (?). 

I suspect that it is the same kit as this:

https://www.elise-shop.com/eliseshopcom-electronic-valve-controller-kit-p-502725.html?zenid=a9664b43b1e32953a03913cbe661676a
 

The fob is certainly identical. It is also much cheaper. 

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Excellent sleuthing - I suspect you are correct. 😎

KT just responded to my enquiry about product contents and fitment instructions, but they said only “we send a wiring manual with the part”. 

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On 05/06/2019 at 14:04, Craig Red Evora said:

My 2010 S1 has the long ratio gearbox. At 70 MPH it is doing approx 1850 rpm in 6th gear, at those revs the flap is closed so it is a nice quiet cruise. That may be why they chose to close it until above 2300, with normal motorway speeds in the UK you don't have a droning exhaust.

I had a non valved 2bular and it droned below 2300rpm so I'd say that's exactly why it does it!

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