2001 E38 728i Sport - ECU Remapping Advice re: potential MPG improvement?

Notices
 

Thread: 2001 E38 728i Sport - ECU Remapping Advice re: potential MPG improvement?

Reply to Thread
Results 1 to 9 of 9
  1. 2001 E38 728i Sport - ECU Remapping Advice re: potential MPG improvement? 
    #1
    BMW Fanatic
    Car Details
    cmarg's Car Details
    Model of Car:
    728i Sport Individual
    Year of Manufacture:
    2001
    Transmission Type:
    Automatic
    Car Body Type:
    Saloon

    Join Date
    Oct 2011
    Location
    Ireland/ N Ireland
    Posts
    37
    Thanks
    11
    Thanked 1 Time in 1 Post
    First time owner and poster. After suffering a rep-box for the last 6 years I recently bought a 728i Sport which I love! Went for the smallest engine as with Northern Irish Fuel prices it's all I can afford, but was pleasantly surprised with the performance for such a heavy car.

    Whilst researching the e38 I got the impression that 25mpg was easily achievable with mixed driving and 27-28mpg was likely if you did a reasonable bit of cruising/steady driving. My daily commute is around 9-10 miles each way, 7 of which is steady driving out of town at between 38-45mph. This means I am quite often on the cusp between 4th/5th gear, more often in 4th with a resulting 22-23mpg average over a tank (averaged 32mpg on motorway run back from Kent to NI @ 70-75mph, so I'm happy the engine is not at fault). Long story short, I was considering getting a re-map to boost power & torque slightly in the hope that it might encourage the car to slip into (or stay) in 5th at these speeds and improving my average mpg (assuming a soft right foot). I've gleaned that a 5-10% power and torque improvement is possible with a remap and am aware of the insurance implications.

    Does anyone have any experience of remapping the M52 2.8i? If so, have you found the car able to hold the higher gears longer at lower revs with an improvement in MPG? (perhaps I'm being naive and the gear changes are actually dictated by speed& revs and not speed/engine load!?!)

    Any and all help greatly appreciated, cheers, C
     
     

  2. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  3.  
    #2
    BMW Guru
    Car Details
    E36Coupe328's Car Details
    Model of Car:
    328 + 325
    Year of Manufacture:
    1995 + 1994
    Transmission Type:
    Manual
    Car Body Type:
    Coupe
    E36Coupe328's Avatar
    Join Date
    Jul 2010
    Location
    UK
    Posts
    2,978
    Thanks
    225
    Thanked 1,091 Times in 958 Posts
    I don't see the point. If it cost say £300 to do you would have to save 10% on £3K of fuel to break even. If oyu do enough miles and keep it long enough then maybe oyu would break even or pull ahead but is it worth the initial outlay

    Lol all arguments people used to give me against going LPG except I save 39%


    No warranty of any kind implied or given and no liability for any loss, damage or injury, no matter how incurred accepted.

    Free Gas Kit* now fitted to free 328*

    *Based on ROI period exceeded
     
     

  4.  
    #3
    BMW Fanatic
    Car Details
    cmarg's Car Details
    Model of Car:
    728i Sport Individual
    Year of Manufacture:
    2001
    Transmission Type:
    Automatic
    Car Body Type:
    Saloon

    Join Date
    Oct 2011
    Location
    Ireland/ N Ireland
    Posts
    37
    Thanks
    11
    Thanked 1 Time in 1 Post
    Thanks for the feedback. I currently do 10-12k a year on average and plan to keep the car for the next 4 years at least all going well, so I should recoup the bulk of the £300 odd quid within a year to 18 months...if that sort of figure/improvement is achievable?
     
     

  5. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  6.  
    #4
    BMW Guru
    Car Details
    E36Coupe328's Car Details
    Model of Car:
    328 + 325
    Year of Manufacture:
    1995 + 1994
    Transmission Type:
    Manual
    Car Body Type:
    Coupe
    E36Coupe328's Avatar
    Join Date
    Jul 2010
    Location
    UK
    Posts
    2,978
    Thanks
    225
    Thanked 1,091 Times in 958 Posts
    12000 miles / 25 mpg = 480 Gallons 2182 litres @ £1.289 = £2812

    Personally.............. nope. Depends what mapping costs you


    No warranty of any kind implied or given and no liability for any loss, damage or injury, no matter how incurred accepted.

    Free Gas Kit* now fitted to free 328*

    *Based on ROI period exceeded
     
     

  7.  
    #5
    BMW Fanatic
    Car Details
    cmarg's Car Details
    Model of Car:
    728i Sport Individual
    Year of Manufacture:
    2001
    Transmission Type:
    Automatic
    Car Body Type:
    Saloon

    Join Date
    Oct 2011
    Location
    Ireland/ N Ireland
    Posts
    37
    Thanks
    11
    Thanked 1 Time in 1 Post
    Thanks again. However, my question is will remapping offer any mpg improvements? and if so, what sort of improvement? That would then dictate the maths and any cost benefit analysis on whether it is worth doing or not
     
     

  8.  
    #6
    Bimmer Fan
    Car Details
    Xdrive's Car Details
    Model of Car:
    BMW 535D
    Year of Manufacture:
    2005
    Transmission Type:
    Manual
    Car Body Type:
    Sedan

    Join Date
    Apr 2010
    Location
    NY
    Posts
    2
    Thanks
    0
    Thanked 1 Time in 1 Post
    You can buy this 7 series: here, I will assure you will be pleased of it without doing any ecu remapping. I am kidding..
    From my mind I know that doing ECU rem. for your car will improve the MPG with about 1 liter per 64miles.
    Cheers
     
     

  9. The Following User Says Thank You to Xdrive For This Useful Post:

    cmarg (10-08-2012)

  10.  
    #7
    BMW Fanatic
    Car Details
    cmarg's Car Details
    Model of Car:
    728i Sport Individual
    Year of Manufacture:
    2001
    Transmission Type:
    Automatic
    Car Body Type:
    Saloon

    Join Date
    Oct 2011
    Location
    Ireland/ N Ireland
    Posts
    37
    Thanks
    11
    Thanked 1 Time in 1 Post
    Thanks for that. Nice 7's...must be great to have cheap gas. 1 litre over 64 miles is around 10% so that's significant, waiting on a quote from a uk tuner, seems to be in around £250 so it would be paid for over the course of a year...assuming a light right foot
     
     

  11.  
    #8
    Bimmer Fan
    Car Details
    Xdrive's Car Details
    Model of Car:
    BMW 535D
    Year of Manufacture:
    2005
    Transmission Type:
    Manual
    Car Body Type:
    Sedan

    Join Date
    Apr 2010
    Location
    NY
    Posts
    2
    Thanks
    0
    Thanked 1 Time in 1 Post
    Quote Originally Posted by cmarg View Post
    Thanks for that. Nice 7's...must be great to have cheap gas. 1 litre over 64 miles is around 10% so that's significant, waiting on a quote from a uk tuner, seems to be in around £250 so it would be paid for over the course of a year...assuming a light right foot
    You will have the car's max. Nm at lower RPM than before doing ecu remap. so you will have a lower consumption... If you will kick the acceleration of the car, the consumption will be higher than before, so if you drive calm you will have lower consumption, if you drive fast you will have higher cons. Hope this will help to your decision. Cheers
     
     

  12.  
    #9
    BMW Fanatic
    Car Details
    cmarg's Car Details
    Model of Car:
    728i Sport Individual
    Year of Manufacture:
    2001
    Transmission Type:
    Automatic
    Car Body Type:
    Saloon

    Join Date
    Oct 2011
    Location
    Ireland/ N Ireland
    Posts
    37
    Thanks
    11
    Thanked 1 Time in 1 Post
    Thanks for your help, much appreciated, found a well recommended specialist nearby and cost is reasonable too, thanks again!
     
     

Tags for this Thread

View Tag Cloud

Posting Permissions
  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts