BMW B58 vs S55 Testing

B58 vs S55 Dyno Comparison

 

We often see discussions about the relative merits of the B58 engine (found in the BMW M140i, M240i, 3/440i and more) vs the S55 found in the F8X M3/M4 as well as the new M2 competition.

Whilst you often see dyno graphs of both, we don’t often see direct comparisons. Armed with dyno data from several B58’s tested on our dyno as well as results from my own M4 Competition I thought we could produce some interesting comparisons.

For the basis of these comparisons I exported the run files of these B58’s:

The first is a bone stock M240i with and without our box fitted:

The second is another M240i with VRSF Decat, again with and without our box fitted.

 

 

We then have a stock run from our M4 Competition Pack, and then tuned with our new 3 channel tuning module for the S55:

 

We exported all the data from all of these runs as .csv files so that they could be re-plotted all on the same graph. Starting with the stock M4 Comp vs the Stock B58:

 

It is worth noting that the M4 Comp tested does have a little more power quoted than the regular M4 (450PS vs 431PS) and a lump more than the M2 competition at 410PS. Still, it beats the B58 hands down from 3000RPM onwards.

 

 

Next we compare the stock M240i with the addition of our Bluespark Pro Petrol tuning box vs the same S55 engine:

 

As you can see, the B58 engine is now making more power than the Stock S55 right up until 5500RPM. After this point the S55 climbs away and goes on to a higher redline, but the tuned B58 has definitely started to close the gap. 

Next we can add the decat to the B58 and again compare the results:

 

As you can see, now the B58 is really getting somewhere. It is making significantly more power than the S55 right up to 5800RPM, and over 100HP extra at 2500RPM. The only point at which the S55 is now beating the B58 is in a narrow band between 6000 and 6600RPM, and still only by a maximum of 17hp. The gains down low far more than make up for this.

The gains here make this package a performance bargain. With the Bluespark tuning box alone, the B58 has around the same area under the curve as the S55. Add the decat and for under £500.00 you have a package that in a straight line will out drag a stock M3/M4.

 As with any tuned vs stock debate, inevitably the next question is “what if the S55 was tuned?” Fortunately, we have already done this, and with our new multi-channel tuning system (check it out here) for the S55, the gap is inevitably significantly widened:

 

This takes nothing away from the B58, though it does strike me that any customers who have gone from a tuned Mx40i to the new M2 Competition might be sorely tempted to look our way for a warranty friendly tuning solution…

If you are interested in what we could do for your B58 or S55, please take a look at the relevant link below or our BMW Tuning page: 

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  1. Before
    379PS 279KW 500NM
    After
    430PS 316KW 564NM
    BMW M340i XDRIVE 3.0 379PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  2. Before
    326PS 240KW 450NM
    After
    371PS 273KW 508NM
    BMW 740i 326PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  3. Before
    340PS 250KW 450NM
    After
    415PS 309KW 605NM
    BMW 640i 340PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  4. Before
    460PS 338KW 550NM
    After
    520PS 383KW 620NM
    BMW M4 460PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  5. Before
    360PS 265KW 500NM
    After
    409PS 301KW 564NM
    BMW 640i 360PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  6. Before
    360PS 265KW 450NM
    After
    409PS 301KW 508NM
    BMW 440i 360PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  7. Before
    360PS 265KW 450NM
    After
    409PS 301KW 508NM
    BMW 540i 360PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  8. Before
    340PS 250KW 450NM
    After
    386PS 284KW 508NM
    BMW 740i 340PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  9. Before
    360PS 265KW 450NM
    After
    409PS 301KW 508NM
    BMW 340i 360PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  10. Before
    360PS 265KW 500NM
    After
    409PS 301KW 564NM
    BMW X3 M40i 360PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  11. Before
    370PS 272KW 500NM
    After
    390PS 286KW 564NM
    BMW M2 3.0 370ps - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  12. Before
    340PS 250KW 450NM
    After
    415PS 309KW 605NM
    BMW 540i 340PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
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