296 GTB V6 Power and Torque details | Page 2 | FerrariChat

296 GTB V6 Power and Torque details

Discussion in '296' started by inox, Aug 3, 2021.

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  1. inox

    inox Formula Junior

    Oct 11, 2017
    350
    Driving a Ferrari in eletric only mode is probably not going to be too interesting, but I'm still interested where 296 GTB lands with the emissions.

    Electric only mode in SF90 Stradale drives via front wheels only. That's sensible if you have electric motors in the front too. 296 GTB, however, has to manage with its single electric motor located at the rear. It is separated from ICE via the clutch so that in electric only mode the ICE can remain stationary.

    Given that 3-litre V6 is certainly going to be more economic than 4-litre V8, and 296 GTB is also 100 kg lighter than SF90, I would assume 296 GTB is going to beat the co2 figure of SF90 Stradale (154 g/km) quite easily.

    Then again, the two electric motors in SF90 can drive the front wheels directly, whereas in 296 GTB the drive must go through the gearbox. Not sure if this does have a meaningful effect in electric drive efficiency.
     
  2. inox

    inox Formula Junior

    Oct 11, 2017
    350
    Actually Ferrari claims following dry weights:

    SF90 Stradale: 1570 kg
    Assetto Fiorano: base model - 30 kg

    296 GTB: 1470 kg
    Assetto Fiorano: base model - 15 kg


    However, it is likely that Ferrari informs the lightest dry weight figure for its models, so this is probably closer to truth:

    SF90 Stradale: 1600 kg
    Assetto Fiorano: 1570 kg

    296 GTB: 1485 kg
    Assetto Fiorano: 1470 kg

    So, the base model of 296 GTB is likely to be 115 kg lighter than corresponding SF90 Stradale.
     
  3. inox

    inox Formula Junior

    Oct 11, 2017
    350
    #28 inox, Oct 2, 2021
    Last edited: Oct 2, 2021
    296 GTB luggage space is informed in the brochure as follows:

    Boot capacity: 202 l
    Rear bench capacity: 112 l

    So, a much bigger boot than in SF90 Stradale (74 l) and even marginally bigger than in F8 Tributo (200 l). The previous 488 GTB model had a slightly bigger one though (230 l).
     
  4. LVP488

    LVP488 F1 Rookie

    Jan 21, 2017
    4,839
    France
    15% more makes some difference ;)
    The F8 had the penalty of the S-duct (which eats some of the boot space) but they managed to make a small boot on the 296 with no S-duct.
     
    Jo Sta7 likes this.
  5. inox

    inox Formula Junior

    Oct 11, 2017
    350
    Yes. Not sure where they lost 28 liters from 488 GTB to 296 GTB. The front overhang is almost identical in both models:

    488 GTB: 1147 mm
    296 GTB: 1150 mm
     
  6. inox

    inox Formula Junior

    Oct 11, 2017
    350
    #31 inox, Oct 9, 2021
    Last edited: Oct 9, 2021
    While 296 GTB has wider body than 488 GTB (+6 mm), its front track (-14 mm) and rear track (-15 mm) are narrower. That may explain some of the lost luggage space. Tyre sizes remain the same between the models.

    --- Model: Width, Front track, Rear track
    296 GTB: 1958 mm, 1665 mm, 1632 mm
    488 GTB: 1952 mm, 1679 mm, 1647 mm
     
  7. inox

    inox Formula Junior

    Oct 11, 2017
    350
    296 GTB emission figures have now appeared on Ferrari web site.

    Model: CO2 emissions, Fuel consumption, Electric energy consumption
    SF90 Stradale: 154 g/km, 6.1 l/100 km, 123 Wh/km
    296 GTB: 149 g/km, 6.4 l/100 km, 140 Wh/km

    However, something is not quite right here. Fuel consumptions and CO2 emissions don't correlate between the models. Lower CO2 figure should mean lower fuel consumption too.
     
  8. inox

    inox Formula Junior

    Oct 11, 2017
    350
    Actually, there seems to be no consistency in homologation results between SF90 Stradale & Spider and their Assetto Fiorano variants. Either the measuring equipment and process is poor or someone is mixing up the figures.


    Model: CO2 emissions, Fuel consumption, Electric energy consumption

    SF90 Stradale: 154 g/km, 6.1 l/100 km, 123 Wh/km
    SF90 Stradale AF: 160 g/km, 6.0 l/100 km, 120 Wh/km

    SF90 Spider: 149 g/km, 6.1 l/100 km, 136 Wh/km
    SF90 Spider AF: 162 g/km, 6.4 l/100 km, 123 Wh/km

    296 GTB: 149 g/km, 6.4 l/100 km, 140 Wh/km
     
  9. inox

    inox Formula Junior

    Oct 11, 2017
    350
    #34 inox, Oct 14, 2021
    Last edited: Oct 14, 2021
    While fuel consumption and co2 figures are not really consistent here, it seems the bigger the electric energy consumption, the lower the co2 emissions are.

    I'm a bit dissapointed that 296 GTB doesn't really seem to improve efficiency over SF90, even if it is at least 100 kg lighter and should have more efficient ICE.

    But I think SF90 benefits significantly from its direct electric drive to front wheels. In 296 GTB the drive goes throught the gearbox and differential and this certainly causes more losses.

    This article gives further information on what the drivetrain losses could be:
    https://www.motortrend.com/how-to/modp-1005-drivetrain-power-loss/

    Losses are probably not as much as 15% for electric drive as the clutch is not included, but could be still over 10%. Could be also much less if gearbox has direct ratio of 1:1 while in electric mode. Then again, I would assume WLTP measurement is done in hybrid operation, so very hard to tell.

    Anyway, the true efficiency of V6 is hidden here and can't be directly compared to V8.
     
    daflk likes this.
  10. AliPaPa

    AliPaPa Karting

    Aug 16, 2011
    79
    daflk likes this.
  11. inox

    inox Formula Junior

    Oct 11, 2017
    350
    According to Auto Motor und Sport (print magazine), 296 GTB has a total system torque of 900 Nm. This is a surprisingly high figure and matches the one that Ferrari gave for SF90 Stradale.

    While the V6 produces 740 Nm and V8 in SF90 Stradale 800 Nm, it appears like 296 GTB's electric system fills this 60 Nm gap completely.
     
  12. inox

    inox Formula Junior

    Oct 11, 2017
    350
    Actually it is not clear what is the total system torque of SF90. Ferrari referred 900 Nm of maximum torque, but some sites claim 960 Nm, for example: https://zeperfs.com/en/fiche7937-ferrari-sf90-stradale.htm

    Latter can be true as well, because torque appears to be battery limited like mentioned in this article:
    https://driving.ca/reviews/road-test/looking-at-the-ferrari-sf90-stradales-hybrid-powertrain-by-the-numbers

    After all, it is likely that battery technology does not differ a lot between 296 GTB and SF90. Therefore an addition of 160 Nm over ICE torque sounds possible in both applications, which would mean 900 Nm (296 GTB) and 960 Nm (SF90). Electric motor of 296 GTB is claimed to have around 20% more torque than in previous applications, but it is not clear what is the reference and whether the increase in torque increases also battery discharge linearly.
     

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