BMW 335d - Tune vs Piggyback

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  1. BMW 335d - Tune vs Piggyback 
    #1
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    brw2013's Car Details
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    Hi all,

    First post on the forums, please be kind

    So, just a little bit of background info before I start. Over the last few months, I've been looking to trade in my 350Z GT 313 for an M3, as I want more power, and more seats...I have test driven various M3's now, Manual, Auto, EDC, non-EDC, etc. and I have to say, if I was to get one, I could only bring myself to buy one with DCT, EDC and a Coupe. To have all of that, and decent condition, mileage, service history, etc., the money racks up!

    Speaking about this to friends, someone the other day mentioned getting a 335i/335d. I hadn't really thought about these before, but recently I keep coming back to them. I love the idea of having a 3l twin turbo if I'm honest In doing a bit of research, I've seen various people have gone down the re-tune route for both cars, and the performance figures are astonishing!!

    I having been looking at the 335d's, and looking at the performance figures that are easily achievable through simple upgrades...However, what I want to know is, is it better to get a re-map done, or piggyback?

    From what I have seen/read so far, a lot of people seem to go down the re-map route (from E-Maps, RemapsUK, DMS, etc.) and the results look good. Now, a lot of people worry here as having this done, it invalidates warranties - This isn't really an issue for me, as I will be looking to get a 2009/10 model, so the warranty will already have expired. What else is there to worry about with re-maps? I've read somewhere that when the car is taking in for a service (BMW garage), they flash the ECU and the mapping disappears, hence having to pay again to get it mapped - Is that correct?

    On the other hand, I have read that getting a simple piggyback solution is amazing (from P-Tronics, Spider, etc.). However, from my limited understanding, a lot of people seem to complain that whilst these are fitted, various parts of the engine wear quickly, i.e. pumps, injectors, boosts, etc. Is this correct?

    Has anyone here actually tuned their 335d? If so, did you go down a remap or tuning box?

    Thanks in advance!
     
     

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    It's rare that BMW would update your ECU without letting you know (read as "adding it onto your bill") and you'll find that most tuners will cover the cost of retuning if the map has been lost for somewhere between free or just covering expenses.
     
     

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    Its best to get a remap rather than a tuning box as all the cars operating perameters are taken into account when mapping.

    Components wear quicker when a tuning box is used because a lot of the time its just the fuel pressure thats increased.

    If your worried about dealer reflashing or updating the ecu just make sure you instruct them not to when you leave the car with them.
    E39 525i SE with M Sport suspension, sport seats and M Sport steering wheel.


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    #4
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    That's great, thank you for the replies.

    It looks as though I will go down the mapping route then - sounds a lot safer. With the mapping route, do you need to upgrade components of the car too though, or is it just a simple case of an ECU remap? I have seen a few where there are different stages, and the higher the stage, the more components you need to change on the car to get this?

    Also, are the remaps for the petrol and diesel 335's as reliable as one another? What are the main problems to look out for in doing any remap tune?
     
     

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    You won't need to change anything, but there are possibilities for more power if the DPF and catalytic converters are removed.
    Even without removing them, you'll still have a big obvious change that'll put a smile on your face.
     
     

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    As TheEnd said it really depends how far you want to go and how much you want to spend, with both the 335i and 335d a solid 60-70bhp gain is easilly made without having to uprate any parts.

    If your looking for more then with the 335i your looking at maybe an intercooler, removing the cats etc, with the 335d maybe uprated injectors, exhaust and dpf removal etc.
    E39 525i SE with M Sport suspension, sport seats and M Sport steering wheel.


    Previous cars 2003 EP3 Civic Type R 30th Anniversary Edition
    2005 E90 320d SE with 200bhp & 400nm
    2005 EP3 Civic Type R Premier Edition
    1997 Accord 2.2 VTEC
     
     

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