E46 320D (148 BHP) Tuning advice

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  1. E46 320D (148 BHP) Tuning advice 
    #1
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    Hi guys, this is my first thread and i'm a bit of a noob with BMW's so please have patience..

    Looking into getting a 320D as at the moment I've got a 306 HDi which I have done a fair bit to but looking to upgrade.

    So my questions are:

    1) What sort of power will the standard internals take and are there any stronger direct replacements?

    2) What sort of turbo's are used for upgrading, is it case of getting one direct fit or 'bodging' one on using an adapter?

    3) With my car I've been able to remap it myself using a KWP2000+ and After a bit of reading on here it would appear you can do the same with the 320d? Is there anyone which makes custom maps which they can email to you?

    4) Are there any real problems with these cars? I've read about the swirlpot issues on the 30d lumps and wondered if there was any real issues with the 20d lumps

    EDIT: I'm referring to the 148bhp 320D

    Thanks!
     
     

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    swirlflap are an issue on the 320d aswell as the 330d, but blanking plates readily available from bmw specialists or flea bay. Also blocked turbo breathers which need replacing for a vortex type if it is still using the 'loo roll' type design as they clog up and can kill the turbo. Talking of turbo's it is not unknown for one to blow. IF you get a euro 4 with with the electronic actuator on it it will mean a new turbo if it packs up. Pre supply pumps can also go giving bad starting/ reluctance to rev.

    The easist way to up the power is a remap as you say, some have taken them upto around the 200bhp mark but depending on the health of the engine/drivetrain you may start knocking out components such as the dual mass flywheel, propshaft guibo, clutch or a turbo. all Rather alot of money to replace. Specialists do offer hybrid turbos and bigger intercoolers depending on your budget and how far you want to go.
    Last edited by bimmer320; 25-02-2012 at 15:34.

    330ci clubsport
     
     

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    The stock lump can take big BHP and torque but the clutch and flywheel can't, if you are to tune beyond 210bhp consider a new clutch setup. Also as you are new to the forum, have you removed the swirl flaps and replaced the engine breather? Two must do things on the M47 engine block as well as the M57 (3 litre)

    What is the history/mileage of the car? BMW have stupid service intervals which don't suite turbos, silly really, I just bought a 2005 525d and whilst it has be religiously serviced as the OBC says, in 74k it has only had three oils changes and never had a new air or fuel filter ! mad.

    Despite modern longlife oils, these car need new oil every 10k, it is so cheap to do a DIY oil change (£32 with a GM Dexos 2 oil which is top spec LL-04 oil and filter) that it does make any sense not to.

    Other common issues are worn rear front control bushes (buy powerflex, Meyle HD or Lemforder, anything else will be useless) worn front wishbones and worn rear trailing arm bushes. The propshaft doughnut goes on high mileage cars and rarely the vibration damper on the engine (big pully on front of engine) wears but that is largely it. Pretty reliable car otherwise
     
     

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    Thanks for the replies guys, I did think that after a remap the turbo would be pretty much on it's limit (GT1749V?). Any idea what turbo the 330D uses and whether it would be a straight fit?

    Clutch wise on my current car there isn't many options about if you want to upgrade so a unsprung paddle clutch is what we would use, does anyone have any info on OEM clutch upgrades? EG. would a 330d clutch fit and if so how much torque roughly are they good for?

    Yeah, I've heard a lot about turbo issues, coming from an already tuned turbo diesel means i do have a bit of an idea but trying to get my head around the issues with these as i've been learning/tuning my pug for the last 2 years! It's making my head hurt a bit.
     
     

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    Interestingly the 330d and 320d use the same turbo and clutch/flywheel setup, you can squeaze more than 200bhp with a remap but it will be a pig to drive as the power will be in a narrow rev range. The 123d for example is a twin turbo 2.0l at 200bhp and 335d is a twin turbo 3.0 litre but it is telling you can only buy it with an auto box and the map on that limits the torque in 1st,2nd and 3rd gears
     
     

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    Hmm.. Are there any other OEM clutches which will hold higher torque? I'm guessing that if not i'd need an uprated paddle clutch the same as my pug

    EDIT: As the displacement of this is 2l just like my pug I'm wondering if a GT2052v would do the trick for higher power (Obviously the turbo would need to be mapped in accordingly) I'm not used to this VNT stuff lol
     
     

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    What years is the car? in late 2003 BMW changed the turbo actuator from vacuum to electronic, this kind of reduces the options you have to tinker as you will need a turbo with matching actuator
     
     

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    Quote Originally Posted by midnightclub View Post
    So my questions are:

    1) What sort of power will the standard internals take and are there any stronger direct replacements?

    2) What sort of turbo's are used for upgrading, is it case of getting one direct fit or 'bodging' one on using an adapter?

    3) With my car I've been able to remap it myself using a KWP2000+ and After a bit of reading on here it would appear you can do the same with the 320d? Is there anyone which makes custom maps which they can email to you?

    4) Are there any real problems with these cars? I've read about the swirlpot issues on the 30d lumps and wondered if there was any real issues with the 20d lumps

    Thanks!
    With regards to 1) ... I personally wouldn't aim higher than 200-210 PS, you could go well above that if you really wanted to, but that's the highest you should go if you want to still have balance between power and reliability. Above that you'd need to start considering a lot more stuff. Bars the problems with the swirls and the breather, the engines are solid and being diesel can take as much boost as its physically able to in theory. Even at 200 horsies, which doesn't sound like a lot of power compared to some cars, the real beauty is the torque, 200 horsies will deliver about 400 to 410nm of torque, which is a fook-load of torque and huge fun. At those levels of torque if you drive it like you want to, then you're going to seriously want to consider getting a stronger flywheel, as the dual mass flywheels will suffer, as will the clutch. You can still have that much torque and not need to change those components but you really need to be considerate in your driving or expect to make the investment in those parts.

    While I'm sure you could remap it yourself, I personally think that would be a bad idea unless you're a professional remapper and know exactly what you're doing. There are well established remapping companies on the go (a few on these forums too with tried and proven maps) and their maps are made specifically for each car, so better to trust those than trying to tweak/eyeball it yourself etc.

    Bigger turbo, you could stick pretty much any turbo on that you want, as long as the actuator is the same, ie vacuum or electronic as Matt pointed out. If you've got a vacuum actuated turbo currently, it would be a true nightmare to try and adapt it to take an electronic one, more hassle than its worth. Turbo wise I wouldn't be so hasty to consider an improvement, the stock ones are more than able to pump out great power with the right remap.

    Best place to start with performance is efficiency, get the swirls blanked if you haven't already, get the breather switched to the vortex style as soon as possible, change oil every 6-7,000 miles, clean the intake manifold, by-pass/disable the EGR system.
     
     

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    Quote Originally Posted by midnightclub View Post
    Hmm.. Are there any other OEM clutches which will hold higher torque? I'm guessing that if not i'd need an uprated paddle clutch the same as my pug

    EDIT: As the displacement of this is 2l just like my pug I'm wondering if a GT2052v would do the trick for higher power (Obviously the turbo would need to be mapped in accordingly) I'm not used to this VNT stuff lol
    Wait is your car an auto - if so you need to be even more careful, the auto box won't handle the increased torque achievable from a simple remap alone, so a custom map designed to take that into account def recommended.

    Changing the turbo is the last thing you should consider for power - heaps and heaps of stuff to do before that, the stock turbo (VNT is better than conventional turbos, more efficient, less lag) is more than up to the task of unlocking more power than an auto box or stock DMF/clutch will appreciate. Bigger turbo, especially non VNT, will inevitably mean more lag, I'd seriously consider other options before messing with the turbo option. Switching from the OEM VNT turbo to a non-VNT would also involve a lot of hassle and coding - which at the end of the day is all futile if all the other easier/cheaper/more practical performance increase options aren't satisfied first.

    Not sure why you're so keen to hit the turbo first for a performance increase tbh, theres a reason why the newer generations have twin turbos, a small one to spool up faster to reduce turbo lag on the big main turbo. Long winded way of saying stick with the VNT
     
     

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    Hmm.. tbh i would've thought that the stock turbo would be pretty hard pushed even after a basic remap, they're not that big to start with although i guess with VNT it helps to maintain power throughout the RPM's, I just don't want it to run out of puff at 4k.

    With tuning on my pug the turbo is the main restriction for more power, only has a baby K03 so after 170bhp they are well out of there efficiency.

    If it's VNT then i'll stick with that but if it's actuator then there is plenty of alternate turbo's out there.


    Really i'm looking for big power, has anyone on here got very far with them? a link to a project thread would be awesome.
     
     

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