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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 07-08-2013, 06:25 AM   #1
jared_wiesner
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Removing the throttle body butterfly rod. (M52tu)

Anyone have any knowledge on how to get the throttle plate rod (butterfly rod) out of the m52tu throttle body. I have the cover and windings off of the one side and all the screws released from the cover with the linkage attached. But no matter how hard I hammer the rod from either end it does not want to slide out. Is there a hidden clip or fastener of some sort that is preventing its removal. I see that both the magnet and the linkage end have a little funny shaped flat nut think on their ends that the rod
Goes through but it doesn't look removable. Or is it just press fit very very tightly. I'm attempting to Frankenstein the 330 throttle body into cable driven with parts from this m52tu throttle body.


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Old 07-08-2013, 06:25 PM   #2
jared_wiesner
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Removing the throttle body butterfly rod. (M52tu)

Never mind, funny looking nut on end had to be cut.


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Old 07-09-2013, 08:21 AM   #3
Hornung418
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Re: Removing the throttle body butterfly rod. (M52tu)

Can you share some pictures?

I was considering Gary's 3.0 mechanical unit but I really wanted to retain cruise control for highway journeys. Then I thought I could have him take the MDK unit and make it work on the stock 3.0 TB...but I couldn't find the proper TB at the yard to send off to him.

So we eventually determined that an MS43 DME swap would be the only appropriate way to get the larger 330 TB to work.

And currently I have confirmed that you can retrofit the 330 e-pedal and the throttle body.

Just waiting on matching electronics so it will fire. Video next Monday. Hopefully my car does not pull a challenger and explode during take-off.

Good luck with the project. Rooting for you!

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Old 07-09-2013, 08:38 AM   #4
jared_wiesner
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Removing the throttle body butterfly rod. (M52tu)

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Originally Posted by Hornung418 View Post
Can you share some pictures?

I was considering Gary's 3.0 mechanical unit but I really wanted to retain cruise control for highway journeys. Then I thought I could have him take the MDK unit and make it work on the stock 3.0 TB...but I couldn't find the proper TB at the yard to send off to him.

So we eventually determined that an MS43 DME swap would be the only appropriate way to get the larger 330 TB to work.

And currently I have confirmed that you can retrofit the 330 e-pedal and the throttle body.

Just waiting on matching electronics so it will fire. Video next Monday. Hopefully my car does not pull a challenger and explode during take-off.

Good luck with the project. Rooting for you!

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Yep I'll get some pics up, I don't think it'd be a huge deal to just have it bored out. Enough material to get to the size of the 330 butterfly at least.


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Old 07-09-2013, 08:44 PM   #5
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Re: Removing the throttle body butterfly rod. (M52tu)

Awesome. Can't wait to see the progress.

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Old 07-10-2013, 05:09 PM   #6
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Removing the throttle body butterfly rod. (M52tu)

Here's some pics of progress today. Started doing a hand port of the throttle body that I busted the magnet on as a proof of concept. Hell if it turns out ok I'll try swapping working electronics into it and seeing how it does on the dyno.
First pic compares 330 to 328 throttle body.
Second pic shows the 330 throttle plate positioned on the bottom of the 328 throttle body.
Third pic shows after I have it partly ported and the 330 throttle plate is fitting down the bore.
Forth pic shows progress of my porting compared to 328 throttle plate in bore.
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Old 07-10-2013, 07:28 PM   #7
Hornung418
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Re: Removing the throttle body butterfly rod. (M52tu)

So you are boring out the MDK assembly to accomodate the 330 throttle plate?

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Old 07-10-2013, 08:07 PM   #8
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Removing the throttle body butterfly rod. (M52tu)

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Originally Posted by Hornung418 View Post
So you are boring out the MDK assembly to accomodate the 330 throttle plate?

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Yep.

Gave up on trying to splice the 328 TB electronics onto the 330 TB, the tps magnet and brush is too delicate to take off of the rod.


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Old 07-11-2013, 05:06 AM   #9
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What are you using to port it? The marks look like a die grinder!
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Old 07-11-2013, 06:07 AM   #10
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Removing the throttle body butterfly rod. (M52tu)

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What are you using to port it? The marks look like a die grinder!
I'm doing a rough in job with a dremel on this one. I don't really intend for it to be used, more I want to make sure all the tolerances are what they need to be and I don't punch through the wall or anything anywhere. If it turns out pretty good with just light wall marking then I'll smooth it out with a flapper wheel or something and give it a try. Also the tooling marks at the lip are way worse then anywhere in the bore. The thing has a habit of jumping when you try and hold it steady on that edge. Really all it has to do is flow more air at WOT. If it idles like poo due to not sealing perfectly on the butterfly that's no biggie if it proves its worth more power on the dyno. Then I'll just get the next throttle body CNC honed/bored to the same dimensions.


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Old 07-11-2013, 06:09 AM   #11
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Removing the throttle body butterfly rod. (M52tu)

You're boring it with a dremel...?
Your tolerances are going to be seriously off and it will have trouble idling. You're not going to be able to create a perfectly round bore with a dremel.
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Old 07-11-2013, 06:21 AM   #12
jared_wiesner
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Removing the throttle body butterfly rod. (M52tu)

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You're boring it with a dremel...?
Your tolerances are going to be seriously off and it will have trouble idling. You're not going to be able to create a perfectly round bore with a dremel.
Did you even read past dremel...


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Old 07-11-2013, 07:29 AM   #13
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Quote:
Originally Posted by jared_wiesner View Post
I'm doing a rough in job with a dremel on this one. I don't really intend for it to be used, more I want to make sure all the tolerances are what they need to be and I don't punch through the wall or anything anywhere. If it turns out pretty good with just light wall marking then I'll smooth it out with a flapper wheel or something and give it a try. Also the tooling marks at the lip are way worse then anywhere in the bore. The thing has a habit of jumping when you try and hold it steady on that edge. Really all it has to do is flow more air at WOT. If it idles like poo due to not sealing perfectly on the butterfly that's no biggie if it proves its worth more power on the dyno. Then I'll just get the next throttle body CNC honed/bored to the same dimensions.


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With the M50 throttle body, boring it out 2mm left a really thin wall... about 2-3mm if I remember correctly. That's one errant turn of a lathe wheel, nevermind a Dremel tool which will want to jump around.

Forget about idle problems... you'll never get the bore uniform enough with a dremel to even get the right size throttle plate in there. Throw it away and start over with the right tools.
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Old 07-11-2013, 07:43 AM   #14
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With the M50 throttle body, boring it out 2mm left a really thin wall... about 2-3mm if I remember correctly. That's one errant turn of a lathe wheel, nevermind a Dremel tool which will want to jump around.

Forget about idle problems... you'll never get the bore uniform enough with a dremel to even get the right size throttle plate in there. Throw it away and start over with the right tools.
Yee of little faith. As a prototype I have absolute faith that this will work just fine.
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Old 07-11-2013, 08:44 AM   #15
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Old 07-11-2013, 09:02 AM   #16
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Experience is a hard teacher, but a fool will have no other.
Ha its on now! Now, just to show you what my experience can do, I'll even make it look pretty.
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Old 07-11-2013, 10:00 AM   #17
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It doesn't have to be pretty. What it does have to be is a very nearly perfect round bore. I have no idea how you will achieve anything close to that with a dremel, but I'm excited to learn something new.
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Old 07-11-2013, 10:11 AM   #18
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Removing the throttle body butterfly rod. (M52tu)

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It doesn't have to be pretty. What it does have to be is a very nearly perfect round bore. I have no idea how you will achieve anything close to that with a dremel, but I'm excited to learn something new.
Not to prove the concept that the bore has enough material to be bored to the 330 size it doesn't, nor does it need to be to prove that it makes more power at WOT where sealing of the throttle valve makes no difference.

Further you realize the bore is far from perfectly round it is actually an oblong shape.


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Old 07-11-2013, 01:46 PM   #19
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Not to prove the concept that the bore has enough material to be bored to the 330 size it doesn't, nor does it need to be to prove that it makes more power at WOT where sealing of the throttle valve makes no difference.
If your car can't run well enough to get to the dyno then yes, it does.

Quote:
Further you realize the bore is far from perfectly round it is actually an oblong shape.
My 330i throttle body and my M50 were circular cross section... if the 328/323 throttle is an oval, fine, but you're missing the point. The butterfly needs to be able to fit inside the bore, seal against the bore reasonably well and be able to actuate for the car to run properly. The way you've chosen to enlarge your throttle bore makes this impossible.
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Old 07-11-2013, 01:51 PM   #20
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Originally Posted by SoloII///M View Post
If your car can't run well enough to get to the dyno then yes, it does.



My 330i throttle body and my M50 were circular cross section... if the 328/323 throttle is an oval, fine, but you're missing the point. The butterfly needs to be able to fit inside the bore, seal against the bore reasonably well and be able to actuate for the car to run properly. The way you've chosen to enlarge your throttle bore makes this impossible.

Haha well we will see won't we
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