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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 06-28-2010, 03:11 PM   #41
Snik
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i dont think there is enough material to widen it rayce.

BUT, didnt E36 M3 guys do something similar with the 540 HFM on their cars, im sure one of BMWs older motors have a compatible mechanical TB that can fit.
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Old 06-28-2010, 03:14 PM   #42
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Look for posts of @Icemann on forum, he did the swap
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Old 06-28-2010, 04:03 PM   #43
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Easy: http://www.turnermotorsport.com/html..._ID=TEN9990850

fits your M52TU TB onto the M54 manifold.



My bigger question is: Is it possible to keep the diameter of the B30 setup by either converting the B30 TB to mechanical throttle, or to widen the M52 TB from 2.5" to 3.0"...? I have all components here for the conversion, even that adapter. I just want to know if there is a possibility for this, because the smaller TB and following intake components would act as a restrictor...
A larger TB isn't really worth any power.
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Old 06-28-2010, 04:05 PM   #44
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proof? just curious how u know this
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Old 06-28-2010, 04:17 PM   #45
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Because the TB isn't a restriction.
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Old 06-28-2010, 04:18 PM   #46
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so why does dinan and a few other tuners offer larger TB fr our cars?
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Old 06-28-2010, 04:21 PM   #47
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I don't think it's worth MUCH power, especially if you don't have a lot else going on. I'll be hitting the dyno with one fairly soon. I'll post up results.
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Old 06-28-2010, 04:29 PM   #48
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will be waiting for the dyno.
what about the swap, as I know, iit`s worth because of gain of HP not torque, HP gains are at high rpm, but you can lose torque on low rpm. THis is the difference between manifolds of m52b25tu and m54b30. Nobody have mentioned gains or lose from TB.
Larger TB`s offered by tuners, may be for the M50 intake, or in case you swap the intake manifold and want also a bigger TB but you don`t want it to be DWB. Check turnermotorsports, you`ll see.
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Old 06-28-2010, 05:13 PM   #49
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all those mods listed + wieght loss. Get a LTW battery, take out the spare (and/or put ZHP donut tire in), put in lightweight seats, go on a diet, aluminum catback exhaust...mkodama made a thread about wieght loss, and you can shave about 100-120lbs for free: http://forum.e46fanatics.com/showpos...&postcount=483 LTW seats, wheels, battery, etc will start to dig into your wallet. I remember some company made some lithium ion batteries for our cars...not sure what happened to that though.
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Old 06-28-2010, 10:40 PM   #50
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I'm almost ready to install mine... just need the width of the adaptor plate. i'm having it made by a friend.
Otherwise i have the drawings if anyone wants them...
i'm putting m54b30 manifold on my 328.
So if anyone knows the width of the adaptor let me know.
thanks

I'll get dyno results when installed.
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Old 06-29-2010, 01:17 AM   #51
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Do you have pre-install dyno results too? For comparisson?
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Old 06-29-2010, 04:05 AM   #52
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not up to date with what's on the car but i'll see how i go for time... would be good getting some comparison for this mod.
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Old 06-29-2010, 05:54 AM   #53
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awesome zac, looking fwd to seeing dyno results and hearing your impression.
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Old 06-29-2010, 12:48 PM   #54
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I'm not sure I'm understanding what is going on here, but let me clear a few things up:
I did the M54B25 manifold swap from the M52TU and there is a noticeable increase in power in higher rpm, and no perceptible loss of power before the DISA switch over. As far as the larger bore Throttle body goes, I don't believe there is much to be gained there. Hovering Guy is using a smaller diameter throttle body from an M50 motor, and still managed to make about as much power as Jackeatsemokids did with custom tuning. This leads me to believe that the throttle body is flowing as much air (or more) than the head, meaning it's probably not a limiting factor. Is there power to be gained? Perhaps, but unless it's cheap, it's probably not worth the effort.
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Old 08-01-2010, 02:27 PM   #55
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bump! any info on swapping bottom end with an s52 onto an m52tu head?
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Old 08-01-2010, 10:26 PM   #56
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1. Don't buy useless bolt-ons that will barely yield any hp/tq
2. Save up for boost
3. ????
3. Profit
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Old 08-02-2010, 08:46 AM   #57
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. Hovering Guy is using a smaller diameter throttle body from an M50 motor, and still managed to make about as much power as Jackeatsemokids did with custom tuning. This leads me to believe that the throttle body is flowing as much air (or more) than the head, meaning it's probably not a limiting factor. Is there power to be gained? Perhaps, but unless it's cheap, it's probably not worth the effort.
This is true. My tiny M50 TB had a negligible impact on power.

I finally upgraded to an M54-size throttle body...

Initally, throttle response feels better, but I think that's because it gets to X airflow at a higher pedal position (same throttle plate angle has more airflow). After a few days of driving that goes away when your foot recalibrates.

Power feels the same. I may have 3-5 more HP at the top end but my ass isn't calibrated well enough to say for sure.

BMW put the M50 TB on the S50, I'm sure they wouldn't have done that if it cost them more than a few HP!
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Old 08-11-2010, 08:01 PM   #58
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Very interesting! I would love to see some dynos of the a m54 IM swap to a m52tu. A nice (cheaper) power increase for my 323i.
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Old 08-16-2010, 04:57 PM   #59
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I'm almost ready to install mine... just need the width of the adaptor plate. i'm having it made by a friend.
Otherwise i have the drawings if anyone wants them...
i'm putting m54b30 manifold on my 328.
So if anyone knows the width of the adaptor let me know.
thanks

I'll get dyno results when installed.
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Old 12-02-2010, 11:26 AM   #60
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M52TU Head Swap for an M54?

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As far as I know, from reviewing part numbers and the like, the cylinder heads on the M52TU and M54 are the same.

Facing the need to get a new head from my cracked m52tu. Any more confirm / deny on ability to use a m54 head as a direct bolt-in?

Thanks all!
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