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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 07-18-2013, 01:39 PM   #21
Hornung418
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Re: Removing the throttle body butterfly rod. (M52tu)

Updates?


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Old 07-18-2013, 04:11 PM   #22
jared_wiesner
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Removing the throttle body butterfly rod. (M52tu)

None yet, sister is getting married this weekend I'm the best man been a busy week. At the cottage next week but after that I'll have some time again.


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Old 07-18-2013, 04:14 PM   #23
Hornung418
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Re: Removing the throttle body butterfly rod. (M52tu)

Best wishes this weekend to the newlyweds

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Old 07-30-2013, 06:59 AM   #24
Hornung418
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Re: Removing the throttle body butterfly rod. (M52tu)

Bump for information.

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Old 07-30-2013, 07:25 AM   #25
jared_wiesner
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Removing the throttle body butterfly rod. (M52tu)

Got home from the cottage Sunday, plan to continue with it this week.


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Old 08-04-2013, 08:48 PM   #26
Hornung418
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Re: Removing the throttle body butterfly rod. (M52tu)

New progress pics?

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Old 08-07-2013, 07:11 AM   #27
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'02 330Ci - Megasquirt 3 tuned by PFTuning.com, M50 manifold, Kromer Kraft headers, Motons, widebody, etc.
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Old 08-12-2013, 11:08 PM   #28
Hornung418
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Re: Removing the throttle body butterfly rod. (M52tu)

New week bump!

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Old 08-13-2013, 07:59 AM   #29
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Some info that might help jared out (then again, maybe not):

When we installed the Megasquirt system, I had set the M50 throttle body to be fully closed. I figured the idle valve had enough airflow to control the idle on its own. As it turns out, it does, but it makes for a little bit of an unstable idle. Peter (PFTuning.com) suggested that I adjust the throttle stop so the throttle body was passing just a little bit of air. Otherwise the throttle plate gets sucked shut, causing an unstable idle.

I adjusted the stop to 4% throttle (reading the TPS output on the Megasquirt tuning software) which looked to be barely cracked - I was just able to see a little sunlight through it. Well, that gave me a 3,000 RPM idle even with the idle valve duty % set to zero. I had to back off the throttle body to about 1% at the TPS output to get a nice, stable 800 RPM idle.

In summary, the throttle body has to seal damned well if you want the car to start and run reasonably well.
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Old 08-13-2013, 08:52 AM   #30
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Re: Removing the throttle body butterfly rod. (M52tu)

Wow...great info.

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Old 08-19-2013, 08:15 PM   #31
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Old 08-24-2013, 08:58 PM   #32
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Old 08-25-2013, 04:11 PM   #33
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328i m52tu upgrades

I just got m52tub28 intake manifold complete with everything already have one my 328i, but I wanted to polish tb and sand down groves and riges inside tb maybe bore plastic ends on manifold to d shape I know not big improvement but something right also thinking of getting 330 tb and trying to make mechanical I like these challenges And I know It can be done. So I striped manifold of injectors disa ICv tb and harness I'm thinking of painting manifold right now
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Old 08-25-2013, 04:14 PM   #34
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Going to post pics soon also just installed m3 bumper today
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Old 08-30-2013, 11:33 PM   #35
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Found e46fanatic has this custom 54 mechanical
I think very possible to do but would lose my asc right?
But who cares for power anything like I said I'm going to
Bore the new throttle body. And got pics of the groves in the
Tb what do u guys think is the ridges there for a reson or
Just to save money after casting product
Also sneak peek of bumper don't know whether to color Mach
Or plastidip whole car runs about the same
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Old 08-30-2013, 11:35 PM   #36
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Fanatics tb
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Old 08-30-2013, 11:36 PM   #37
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Perfect match
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Old 08-30-2013, 11:38 PM   #38
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Old 01-06-2014, 12:55 AM   #39
jony787
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Removing the throttle body butterfly rod. (M52tu)

The restriction is not the throttle. What is the point of having the biggest throttle available if you still have the same MAF???? Think about that lol!!!!!!!!!!!!!!


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Old 01-06-2014, 03:23 AM   #40
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This is true. I didn't notice any benefit from a, rather expensive, BBTB "experiment" with my M52tuB28 when it was running N/A, except for the change in throttle response relative to pedal position. I actually disliked this, as it took away some of the "definition" of the throttle input, not whatiI want on the track.
I didn't see any power gain outside the margin of error, and this was with "everything" done already (M54B30 manifold, 3.5" MAF, 3.5" Intake Elbow from Samco, Dinan 3.5" CF long CAI w custom made heatshield just because, 272/264 cams, Beisan VANOS, SuperSprint equal-length headers w Swaintech treatment, true dual 330-type exhaust setup with SS cat-delete X-pipe, RE DMS the rest of the way back, VAC Superlight underdrive pulleys, CM Stg2 clutch+LW FW (21lbs for the clutch and FW total), Bosch Gen 3 injectors, and so forth... All w custom dyno tune, no canned tune).
I expected to see SOME power, even if it was way high in the powerband, but I just can't say that there is any definitive gain to be had. The only NA mods I didn't have was extensive head work or bottom end work, and maybe w a "Stage 3+" type head, and a built bottom end pushing 11:1 or better compression, You could see gains, but I would not bet on it... Not until you are well into "can't drive on the street anymore" type motor build.

That said, when I went to the custom TS SC setup and running a built motor, the throttle body is worth about 8rwhp and 7rwtq (on 93oct, and this was at 11.5psi, not the full 16.5psi, so it is probably giving me a solid 10-12rwhp w my normal boost). I only know because I accidentally installed the original TB when reassembling the motor and kit, and it was on for the first dyno tune. I realized it before the second session and swapped it out, and that's what the difference was. Trying to hit over 400rwhp is very difficult, or rather time and money consuming, so the throttle body giving me just a little less than I'd get from a bit more boost, is very welcomeindeed.
I ddid also have the tuner get rid of the "weird" feel of the throttle, not sure exactly what he did, but it now has 98 percent of the precision the OEM setup does, so I am pleased.



Oh, and regarding the other poster who posted a number of times in a row...

You DO NOT WANT TO POLISH the inside of the throttle body, just like you don't want to polish the I/E ports. Smooth results in extremely fast, and significant, carbon buildup (and w the TB, it'll be a lot of oil blowby as well). It also doesn't smooth out airflow, in fact the way to smooth airflow is to have a surface about as rough as you get from 80-100grit sandpaper. The latter prevents any significant boundary layer from forming, and thus more air is moving into the engine.
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