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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-22-2012, 08:09 AM   #1
darksideracer69
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Taking apart m54 throttle body?

Has anyone done it? I know Dinan and maxxbore have to take them apart to bore them out and stuff. So how is it done?

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Old 04-22-2012, 09:37 AM   #2
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To Complicated... Maxxbore wont even do it no more...
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Old 04-22-2012, 09:51 AM   #3
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Yea I know, but they did lol

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Old 04-22-2012, 11:41 AM   #4
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I have an extra one if anyone wants it, it's from a B25.
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Old 04-22-2012, 11:43 AM   #5
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No answers

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Old 04-22-2012, 11:46 AM   #6
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There is no real gain from upsizing the TB, but have at it.
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Old 04-22-2012, 12:21 PM   #7
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I tried to take apart my spare, I broke it.

I contacted Maxbore to see if they'd do one more for me for a favor. He said taking it apart was hell and putting it back together was double hell.
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Old 04-22-2012, 05:12 PM   #8
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Has anyone done it? I know Dinan and maxxbore have to take them apart to bore them out and stuff. So how is it done?

I've got my spare M54B30 TB sitting on my coffee table in front of me, I look it over occasionally trying to figure how to disassemble it; of course the plastic cover is off exposing the gear set. What I believe you would need is some very specialized tools, some type of high quality three or four jaw puller. Banging or hammering on it will kill it quickly. If you go for it, paint (white droplet) the position/location of ALL the different teeth/gear sets, also take a few detailed pics before disassembly. If you get it back together you'll need the same alignment. Another easier way to go about getting a little more flow through it would be to remove the throttle plate & put it on a belt sander to make it half as thick or more. Next would be to remove a substantial amount of material from the throttle shaft & Allen head screws.

Question: Isn't a B30 TB bigger than a B25 TB, and if so why couldn't it be adapted ?


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Old 04-22-2012, 05:17 PM   #9
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Yea, been looking at the gear set, and it looks like that gear on the blade shaft needs to be pulled with a very small puller. I emailed a couple of sources for info, hopefully get a reply tomorrow.

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Old 04-22-2012, 08:40 PM   #10
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There is no real gain from upsizing the TB, but have at it.
I was making 220whp on a tiny little M50 TB on my M54b30, before I upgraded to stock size.

I didn't gain any power, but the response felt different. Throttle felt more sensitive off-idle.
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Old 05-19-2012, 12:10 AM   #11
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Those throttle bodies have a little trick to taking them apart. After you take the plastic cover off, mark a spot where the two gears mesh so you can get it set back up correct. Undo the two screws for the throttle plate, then there is a little pin that goes into a ring land in the shaft that keeps it from sliding side to side. You can pound that pin into it's pocket a ways the break it in half and drive the rest of the pin through. It's just a locating pin so finding the same size roll pin would work as a replacement. Once you drive the pin out then the throttle shaft comes out, but be vewy vewy careful of the little fingers on the position sensor. Maxbore might do it again if YOU strip it down and send him just the raw parts, he said they are to labor intensive for him to do.
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Old 05-19-2012, 07:36 PM   #12
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Good info. Thanks

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