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Exhaust Flap Mod - Cap size?

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
Chris1712
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Exhaust Flap Mod - Cap size?

Post by Chris1712 » Wed May 02, 2018 10:06 am

Hi all,

I want to give the 'Golf Tee' mod a try, but would prefer a more secure device than a golf tee :P. Does anyone know the required Inner Diameter for each end (if they're different) so I can get some proper vacuum line bungs/caps instead? I've heard somewhere 3/16" but can't be sure and dunno if he meant ID/OD let alone which metric equivalent would be best.

Thanks,
Chris
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Carbon Black E86 3.0si Coupe - Gone but not forgotten

Chris1712
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Exhaust Flap Mod - Cap size?

Post by Chris1712 » Fri May 18, 2018 9:27 pm

Quick update for the benefit of others, the answer is 4mm !!

These are perfect, with a 4mm inner diameter.
http://www.autosiliconehoses.com/silico ... -32mm.html

Image

Saves faffing with golf tees or any other mild bodges :p.
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Exhaust Flap Mod - Cap size?

Post by bob4333 » Sun May 20, 2018 9:07 am

Quite a lot of chat about this mod some months back ranging from makes "some difference" to "not much". What have you found.....?

Maniac
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Exhaust Flap Mod - Cap size?

Post by Maniac » Sun May 20, 2018 11:15 am

You can also just disconnect the solenoid in the boot.

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ronk
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Exhaust Flap Mod - Cap size?

Post by ronk » Sun May 20, 2018 1:11 pm

Maniac wrote: Sun May 20, 2018 11:15 am You can also just disconnect the solenoid in the boot.
Is a switch an option in this case ?
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with. :thumbsup:

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Exhaust Flap Mod - Cap size?

Post by Maniac » Sun May 20, 2018 2:50 pm

ronk wrote: Sun May 20, 2018 1:11 pm
Maniac wrote: Sun May 20, 2018 11:15 am You can also just disconnect the solenoid in the boot.
Is a switch an option in this case ?
I guess with some fiddling and the right connectors but frankly it doesn’t make a vast difference so not likely worth it.

I plan to explore removal of baffling from the non quiet phase of that particular silencer so the the change is more notable and to increase the side to side warble from the dual exhaust.

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Exhaust Flap Mod - Cap size?

Post by ronk » Sun May 20, 2018 3:52 pm

Thanks for the advice :thumbsup:
With that in mind I think I will leave the system well alone - it would be good to be able to swap with the flick of a switch but it’s not something that’s going to keep me awake at night!
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with. :thumbsup:

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Exhaust Flap Mod - Cap size?

Post by Chris1712 » Mon May 21, 2018 10:14 am

It doesn't make a huge difference. Noticeable on start up and general pootling around town, not so much when hooning. It's maybe 5% louder, not a problem when cruising at all imo.
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Exhaust Flap Mod - Cap size?

Post by Huzee4 » Tue Jul 09, 2019 3:44 pm

Chris1712 wrote: Fri May 18, 2018 9:27 pm Quick update for the benefit of others, the answer is 4mm !!

These are perfect, with a 4mm inner diameter.
http://www.autosiliconehoses.com/silico ... -32mm.html

Image

Saves faffing with golf tees or any other mild bodges :p.
Thanks all, silicon end caps ordered :thumbsup:
Steve

E85 2.5 SE Maldives blue
E89 20i Estoril blue
E89 35iS Alpine White ( Current Zed )

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Exhaust Flap Mod - Cap size?

Post by mcbutler » Tue Jul 09, 2019 6:08 pm

ronk wrote: Sun May 20, 2018 1:11 pm
Maniac wrote: Sun May 20, 2018 11:15 am You can also just disconnect the solenoid in the boot.
Is a switch an option in this case ?
disconnecting the solenoid exposes the terminals to the elements, the hose is the best option.
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Exhaust Flap Mod - Cap size?

Post by ronk » Tue Jul 09, 2019 6:28 pm

mcbutler wrote: Tue Jul 09, 2019 6:08 pm
ronk wrote: Sun May 20, 2018 1:11 pm
Maniac wrote: Sun May 20, 2018 11:15 am You can also just disconnect the solenoid in the boot.
Is a switch an option in this case ?
disconnecting the solenoid exposes the terminals to the elements, the hose is the best option.
No intention of leaving Terminals exposed but bridging the feed to the solenoid with an in car switch.
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with. :thumbsup:

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Exhaust Flap Mod - Cap size?

Post by john-e89 » Tue Jul 09, 2019 6:44 pm

ronk wrote: Tue Jul 09, 2019 6:28 pm
mcbutler wrote: Tue Jul 09, 2019 6:08 pm
ronk wrote: Sun May 20, 2018 1:11 pm Is a switch an option in this case ?
disconnecting the solenoid exposes the terminals to the elements, the hose is the best option.
No intention of leaving Terminals exposed but bridging the feed to the solenoid with an in car switch.
Pointless effort Ronk, it doesn’t make enough difference to bother. Once done I’m sure you’d be happy to leave as is.
M roady...OEM CSL’s, strut brace, Remus back boxes, ZHP
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ronk
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Exhaust Flap Mod - Cap size?

Post by ronk » Tue Jul 09, 2019 6:59 pm

I agree - I think it’s loud enough as standard - only the change down in sport is something special :thumbsup:
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with. :thumbsup:

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Exhaust Flap Mod - Cap size?

Post by john-e89 » Tue Jul 09, 2019 7:19 pm

ronk wrote: Tue Jul 09, 2019 6:59 pm I agree - I think it’s loud enough as standard - only the change down in sport is something special :thumbsup:
I meant do the mod then leave as is, it’s worth doing as it’s a 30 sec job with the caps and does make it sound a little more burbly and deeper but not nearly enough to need to have it switched.
M roady...OEM CSL’s, strut brace, Remus back boxes, ZHP
MR2 MK 2
E89 35i project car...mapped 365bhp, M4 stoppers & wheels, KWV3’s, H&R front ARB, M3 front arms, strut brace Eisenmann cat back race exhaust, VRSF downpipes inbound
E89 35is
G29

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Exhaust Flap Mod - Cap size?

Post by ronk » Tue Jul 09, 2019 7:42 pm

:thumbsup: I understand

However I do think is nice to have a stealth mode - I use the term “stealth “ very loosely!
Last edited by ronk on Tue Jul 09, 2019 8:02 pm, edited 1 time in total.
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with. :thumbsup:

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