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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > Regional Forums > UK > 440i - Exhaust Flap Mod - The Proper Way...
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      03-26-2020, 05:13 AM   #45
Alscoob
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Quote:
Originally Posted by Randy Johnson View Post
Just a tip, you could just remove the actuator, safety wire the valve open and put the actuator back in place. No need for a dummy circuit.
Does that not throw up a fault code as the electronics will be trying to open / close in different modes and it will be fixed open? Just a thought.
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      03-26-2020, 08:26 AM   #46
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Quote:
Originally Posted by Alscoob View Post
Does that not throw up a fault code as the electronics will be trying to open / close in different modes and it will be fixed open? Just a thought.
I don't think it does.
AFAIK, its pretty dumb. The MPE has a resistor in place of the actuator, so I suggest that if the unit is drawing current when it should, then the ECU will be happy.

I removed my horseshoe clip and wired the flap open. Didn't really make that much difference TBH. Note that if you do this, and then want to reconnect, the actuator won't be in the correct place. Its a stepper motor and I think it just gets timed pulses to operate, so the unhooked actuator will overshoot as the stop is the flap. You need to turn the actuator shaft so it lines up with the position of the flap. You can use a screwdriver in the slot (with it off the car! ) but be aware it is very stiff to turn. When I did mine, I had a "spare" in case I broke it. I didn't.
Currently have on an MPE, so no flap. MPPSK due to be fitted when this current situation calms down. So will have a stock and a modified system to sell 😊
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      05-03-2021, 03:46 PM   #47
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Did this mod today on my 440i GC, the 2019 model has a slightly different shape to plastic trim where to OP fitted his termination block.

I had no issues getting the flap to stay open, just a few revs in sport + and then turned the car off.

I added some black gaffer tape over the exposed contacts to protect it from FOD and moisture getting in and causing a short, the position is such that it would deffo be in the firing line.

Also fitted the black chrome exhaust tips at the same time.
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      05-04-2021, 02:41 AM   #48
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Quote:
Originally Posted by Steve_M_Sport View Post
I've bought from rjberry his 340i exhaust backbox with black tips to fit to my 335D.

I know I need to remove the electric actuator from the exhaust & then open the flap and weld/glue it so the flap remains open - exactly how do I do this (or more likely the chap installing the new exhaust ?

I will contact Phil at Cotswold BMW tomorrow to buy the 340i rear diffuser so once this has been delivered it can be fitted - is this something the exhaust chap will replace or do I need to do it before I take the car - if so how do I remove/refit the diffuser ?

My insurers have confirmed as this does not affect the performance of the car my policy remains the same without any premium increase.
I thought the 35d didn't have the flap? Where is it?
I have a rear box delete on my 35d. So no back box just splits to twin rear pipes near the sub frame
I'd be tempted to do this if there is a flap in the section from the manifold to rear sub frame area.
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      05-04-2021, 08:12 AM   #49
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Quote:
Originally Posted by flashollie View Post
I thought the 35d didn't have the flap? Where is it?
I have a rear box delete on my 35d. So no back box just splits to twin rear pipes near the sub frame
I'd be tempted to do this if there is a flap in the section from the manifold to rear sub frame area.
The flap is on the 340i back box and not on the 335D exhaust.
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      05-04-2021, 08:31 AM   #50
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1st mod i completed on mine. i ordered the part from bmw before car collection, ready to do on the first day. The 440, 430i, 428i have this flap. Other ones dont, maybe the b48 420i but not the n20 420i. No point of this on a derv. They make the same horrible racket regardless of a flap or not.

It deffo makes it louder on start up i have found
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      05-04-2021, 10:47 AM   #51
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defo don't do this if you have the mppsk exhaust, it will give you a headache
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      05-08-2021, 03:25 PM   #52
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Quote:
Originally Posted by Rasco View Post
Did this mod today on my 440i GC, the 2019 model has a slightly different shape to plastic trim where to OP fitted his termination block.

I had no issues getting the flap to stay open, just a few revs in sport + and then turned the car off.

I added some black gaffer tape over the exposed contacts to protect it from FOD and moisture getting in and causing a short, the position is such that it would deffo be in the firing line.

Also fitted the black chrome exhaust tips at the same time.
That looks nice.. Where did you get the black tips from please ?
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      05-11-2021, 08:08 AM   #53
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Quote:
Originally Posted by beerglass007 View Post
Quote:
Originally Posted by Rasco View Post
Did this mod today on my 440i GC, the 2019 model has a slightly different shape to plastic trim where to OP fitted his termination block.

I had no issues getting the flap to stay open, just a few revs in sport + and then turned the car off.

I added some black gaffer tape over the exposed contacts to protect it from FOD and moisture getting in and causing a short, the position is such that it would deffo be in the firing line.

Also fitted the black chrome exhaust tips at the same time.
That looks nice.. Where did you get the black tips from please ?
Thanks, so I got the black chrome tips from Berry BMW parts department Heathrow, so obvs they are OEM and fit the 440i with the standard exhaust perfectly. OEM part Number: 18 30 7 610 633 (for a pair)
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      05-11-2021, 02:54 PM   #54
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Quote:
Originally Posted by beerglass007 View Post
That looks nice.. Where did you get the black tips from please ?

some for sale on this forum classifieds
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