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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Throttle Body Size...power gains?



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      07-07-2013, 03:49 PM   #23
SDemetris
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Hmm, so it requires some additional machining and fab. Can anyone with a spare TB take it apart and take pictures of the butterfly assembly?
I just did with my phone so theyre not great quality. Idk what tool i would need to take apart the butterfly. ill mess with it tomorrow or something. Let me know if you want me to take some more from any angle
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      07-07-2013, 05:15 PM   #24
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ok so i took the plastic cover off the gears that connect the electric actuator to the flap. i can just take off the idler gear between them but i cant find a way to remove the gear that is on the same shaft as the flap. i think im just going to get a little violent with it and see if nothing breaks. its not really worth much anyways. ive never heard of anyone's going bad and needing a replacement
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      07-07-2013, 05:25 PM   #25
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Thats a weird looking TB, lol. Can you take pics of the harness plug and the side of the TB showing the shaft that holds the butterfly? Update: take pics of the gears! Thanks.

I found this thread were a guy measured the ID of the TB vs. the ID of the intake manifold inlet part that connects to the TB. The TB is ~77mm and the intake inlet is ~79mm. This means the intake could make good use of a 79mm TB.

http://www.e90post.com/forums/showthread.php?t=819355
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      07-07-2013, 05:36 PM   #26
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Pictures of the gears
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      07-07-2013, 05:42 PM   #27
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Nice! Looks like the butterfly is plastic with a metal core. I'm wondering if it snaps on/off the shaft.
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      07-07-2013, 11:29 PM   #28
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Jokers_greg just brought to my attention that the TB between the 330i and the 328i are different. Anybody compare the two?
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      07-08-2013, 12:28 PM   #29
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Actually that is not necessary in our cars since the tb is open all the time. we dont need the plate at all in reality. but for every other car that isnt a n52/n55, yes that would have to be done
As I read through this whole thread I was thinking ^this^.

Valvetronic means the t-body is there only to build initial vacuum and as a failsafe for Valvetronic failure. I'd be pretty skeptical that BMW would have undersized an open-all-the-time throttle body to create a restriction.
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      07-08-2013, 12:50 PM   #30
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Jokers_greg just brought to my attention that the TB between the 330i and the 328i are different. Anybody compare the two?
yeah, from what I've read on other posts, the plug is different and the buttefly on the 330 is the traditional design (metal plate with screws).

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As I read through this whole thread I was thinking ^this^.

Valvetronic means the t-body is there only to build initial vacuum and as a failsafe for Valvetronic failure. I'd be pretty skeptical that BMW would have undersized an open-all-the-time throttle body to create a restriction.
I don't think it's undersized, I think it's the size BMW agreed would be correct for the amount of CFM the engine is able to handle in stock form.

I've also read that the butterlfy works as a failsafe for valvetronic failure. So in theory, a 328 stock TB can be bored a couple of mm's bigger without having to modify the buttefly diameter. My concern is, how will it work if there's valvetronic failure?
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      07-09-2013, 10:08 PM   #31
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yeah, from what I've read on other posts, the plug is different and the buttefly on the 330 is the traditional design (metal plate with screws).
Did you read anything about the diameter?
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      07-09-2013, 10:35 PM   #32
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maybe the reason dinan only has the TB listed under the 330 is because its the only one that the plate easily comes off of b/c it screws on as someone said. Just a though
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      07-10-2013, 07:40 AM   #33
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Quote:
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Did you read anything about the diameter?
Yeah it's also 76mm, same as ours.

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maybe the reason dinan only has the TB listed under the 330 is because its the only one that the plate easily comes off of b/c it screws on as someone said. Just a though
+1

Hey did you have any luck removing the shaft and butterfly? I was thinking that maybe the shaft and gear would slide off after removing the butterfly.
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      07-10-2013, 11:27 AM   #34
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Hey did you have any luck removing the shaft and butterfly? I was thinking that maybe the shaft and gear would slide off after removing the butterfly.
I pretty much put all my weight (like 200lbs) on either side of the butterfly, hoping it would snap off the shaft. I think the flap is a thin sheet of steel ( you can kind of see it in the holes in the black plastic) that has 3 pairs of little tabs that were CNC welded onto the central shaft. It would be a real PITA to get that off. It would be possible to grind the tabs off, bore out the TB then weld the flap back on.. Or i suppose if you're feeling really bold you could just cut it off and leave it like that.
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      07-11-2013, 10:26 AM   #35
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Quote:
Originally Posted by SDemetris View Post
I pretty much put all my weight (like 200lbs) on either side of the butterfly, hoping it would snap off the shaft. I think the flap is a thin sheet of steel ( you can kind of see it in the holes in the black plastic) that has 3 pairs of little tabs that were CNC welded onto the central shaft. It would be a real PITA to get that off. It would be possible to grind the tabs off, bore out the TB then weld the flap back on.. Or i suppose if you're feeling really bold you could just cut it off and leave it like that.
I did notice that the shaft itself is pretty beefy with the tabs, also the back portion of the flap has a rib structure that makes the whole butterfly assembly beefier than a traditional butterfly assembly. All of that translates to less air volume passing through the TB.
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      07-11-2013, 11:48 AM   #36
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reference to Dinan TB
http://www.e90post.com/forums/showth...t=dinan+intake

take not how the casing looks different, no clips & how flap is attached

My 128i's flap was metal, not the plastic style
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