General Car Discussion

Discussion in 'Automotive' started by HadACoolName, Mar 6, 2015.

  1. aljowen

    aljowen
    Expand Collapse

    Joined:
    Oct 21, 2012
    Messages:
    1,659
    @Shotgun Chuck @atv_123 @Harkin Labs Gaming
    In the driving modes thread there was discussion about lag in throttle from a standstill. I figured that discussion is more relevant in this thread than in the driving modes thread.

    Today Engineering Explained posted this video:

    In it he explains how modern engines (especially low displacement turbo engines) can have issues with "super knock", which can occur under low RPM high load situations.

    So if you try and pull away hard from a low rpm, you would be creating the ideal situation for super knock to occur, so it would make sense that the engine management would provide less throttle input to the engine until the revs build to prevent that from happening. Since exploding engines is bad for business, especially within warranty.

    I of course don't know if this is actually the reason for the hesitation, but figured its possible that it might be a relevant factor.


    In the video he states that the reasons for super knock are somewhat unknown, but that a new engine oil standard has been released to reduce the likelihood of it happening. Not that new engine oil will remap your ECU of course, even if that is the reason the hesitation was added.
     
    #14961 aljowen, Mar 20, 2019
    Last edited: Mar 20, 2019
    • Informative Informative x 1
  2. atv_123

    atv_123
    Expand Collapse

    Joined:
    Aug 5, 2012
    Messages:
    1,579
    It is very possible this could be what I am feeling... granted, if that is the case then I am amazed they let it get out the door with it being as bad as it is. I suppose I could try and get my mom to fill it up with 93 octane next time she fills it up and see if this issue makes itself less known or goes away (It's rather difficult to find a place that sells high octane around here)

    He says that the cause for super knock is unknown, but it isn't really. Modern engines are being downsized, so they have to make power in other ways and there really are only 3 ways to do that effectively. Increase compression, increase boost, increase revs. Follow those three and you will end up with a powerful engine. Granted, obviously, it isn't quite that easy.

    Modern engines are very small and are designed to spool their turbos very quickly even from low rpm's, so they are fully capable of quickly attaining full boost even from rpm's that are only just above their idle rpm. Heck, my dads older ecoboost actually would start spooling the turbo a little even at idle. When you have boost at rpm's that low, you are giving the air a lot of time to get into the cylinder and can cause a lot more air to end up in there then would normally have time at higher rpm's. Also, at low rpm's, the intercooler has very little air flowing over it, so this air won't be cooled as effectively as most inlet air... thus creating higher intake temperatures than normal. Add that into the fact that manufacturers are starting to push their luck with the amount of compression they can run on a turbo engine (for this exact issue) along with how lean they are trying to run their engines (for increased fuel economy) and you have yourself the perfect storm for pre ignition (knock).
     
  3. aljowen

    aljowen
    Expand Collapse

    Joined:
    Oct 21, 2012
    Messages:
    1,659
    Yeah absolutely. I think he meant unknown in terms of the specifics of what is actually going on inside the engine to cause it. So its known that it happens, and that those things will contribute to it, but the "why" isn't fully understood yet. At least publicly, its totally possible the answer has been found by a few of the car manufacturers, since they aren't too keen on sharing information.

    Mazda seems to agree that there is no replacement for displacement, since they seem to be able to get good figures without downsizing their engines. For example on the Mazda 6 they don't sell anything smaller than a 2.0l engine (145hp), whereas Ford offer a 1.5l engine in the Mondeo (165hp). Maybe making an engine smaller and slapping a turbo on it is the easier or cheaper route to take, but its clear that you can get the same figures out of a bigger engine. Which may well be the better way to go in terms of longevity.
     
  4. SubaruSTI07™

    SubaruSTI07™
    Expand Collapse

    Joined:
    Sep 26, 2017
    Messages:
    3,714
    2020 Mustang Hybrid. Why Ford why?? First Chevy now Ford trying to recreate Chevys Post-2018 styling.
     
    • Agree Agree x 1
  5. aljowen

    aljowen
    Expand Collapse

    Joined:
    Oct 21, 2012
    Messages:
    1,659
    Isn't the point of a mustang to go as fast as possible affordably?
    If so, hybridisation could really boost its performance, especially if its powering the front wheels as rumoured. That should really launch it off the line. It is also to some extent mimicking the electrification technology found in the current hyper cars. Regardless, the rumours don't point towards it being slow.
     
    • Like Like x 2
  6. NGAP NSO Shotgun Chuck

    NGAP NSO Shotgun Chuck
    Expand Collapse

    Joined:
    Mar 6, 2015
    Messages:
    1,211
    Ew, gross.

    EDIT: And by gross I mean it actually looks like a Hyundai from the front.
     
    #14966 NGAP NSO Shotgun Chuck, Mar 23, 2019
    Last edited: Mar 23, 2019
    • Agree Agree x 4
  7. MotherTrucker02

    MotherTrucker02
    Expand Collapse

    Joined:
    Jun 29, 2016
    Messages:
    100
    All fine and dandy if it doesn't end up looking like that picture.
     
    • Agree Agree x 1
  8. aljowen

    aljowen
    Expand Collapse

    Joined:
    Oct 21, 2012
    Messages:
    1,659
    I don't think it will. If it's a hybrid then it still has an engine which will need to breath. Removing the front air intake has been to this point reserved for pure ev's only.
     
  9. howard9068

    howard9068
    Expand Collapse

    Joined:
    Mar 6, 2016
    Messages:
    135
    y.gif
    GIFs in thumbnail don't move lol
     
  10. Ulrich

    Ulrich
    Expand Collapse

    Joined:
    Aug 15, 2013
    Messages:
    1,196
    Fucked up the start, could have chopped off a good 2sc, but eh pretty close to the 13sc factory numbers
     
    • Like Like x 2
  11. rottenfitzy

    rottenfitzy
    Expand Collapse

    Joined:
    Mar 7, 2015
    Messages:
    680
    If it had a V6 DCT hybrid and ecoboost styling, than I wouldn’t mind it at all. They could call it the SVO to add a retro touch. Hell, even a 3cyl would be fine.

    However, it’ll undoubtably look like absinthe found its way into the design room, and will have a 4cyl CVT hybrid.

    Sigh. This won’t go over well with the fanboys at all.
     
  12. nosraenyr kcirtap kcin

    nosraenyr kcirtap kcin
    Expand Collapse

    Joined:
    Aug 16, 2016
    Messages:
    445
    Nothing goes well with the fanboys
     
    • Agree Agree x 2
  13. Potato

    Potato
    Expand Collapse

    Joined:
    Feb 19, 2013
    Messages:
    1,156
    Bought something to replace the Yukon cause the transmission shit out again.
     
    • Like Like x 1
  14. redrobin

    redrobin
    Expand Collapse

    Joined:
    Aug 21, 2012
    Messages:
    532
    See, I really wish I could flip beaters like this, but my parents have no sense of humor.

    A true pitty.
     
  15. vmlinuz

    vmlinuz
    Expand Collapse

    Joined:
    Mar 2, 2014
    Messages:
    1,781


    Let me get this straight: the same generation that brags on Tumblr and/or 4chan all day about having no friends, not knowing "how to adult" and never leaving their parents' basement, needs a giant-ass SUV for their all their friends and their aCtIvE LiFeStYlE (and of course, their rescued German shepherd mix)? Not to mention there's so god damn many of these people that car companies can only sell these compromised trash wagons, or else they go bankrupt?
     
  16. aljowen

    aljowen
    Expand Collapse

    Joined:
    Oct 21, 2012
    Messages:
    1,659
    I don't think many people in their 20's can afford that car, or are in the market for Giant SUV's. Large SUV's are typically aimed at families, and elderly people who want to be able to take their families/friends on holiday.
     
    • Agree Agree x 2
  17. Alex_Farmer557

    Alex_Farmer557
    Expand Collapse

    Joined:
    Dec 28, 2016
    Messages:
    3,426
    or some twat and their dog that thinks they need a lot of space
     
    • Like Like x 3
  18. vmlinuz

    vmlinuz
    Expand Collapse

    Joined:
    Mar 2, 2014
    Messages:
    1,781
    Okay, maybe that was a bad choice of SUV, but my point still stands:



    The Ford Edge ST, because yOu WaNt A pErFoRmAnCe CaR bUt YoU hAvE fRiEnDs!!11!1!1

    Really, it's no more spacious than a Dodge Charger R/T, and you can fit your damn dog into that too. The difference is that crossovers are heavier and less aerodynamic for no good reason.
     
  19. aljowen

    aljowen
    Expand Collapse

    Joined:
    Oct 21, 2012
    Messages:
    1,659
    Maybe its a US thing then, young people here seem to have small cars, with under 30's having perhaps slightly larger ones (Golf to Passat size). Of course, under 30's with families will often get a compact SUV, with older families often getting bigger ones.

    For example:
    upload_2019-3-31_20-3-34.png upload_2019-3-31_20-3-48.png upload_2019-3-31_20-4-3.png upload_2019-3-31_20-4-17.png upload_2019-3-31_20-4-34.png

    And there are a few brands absent from that list too. For example, there is the Toyota Aygo, Citroen C1, Peugeot 108 (all share a platform). As well as the Alfa Romeo Mito, Audi A1, Audi A3, Mercedes A class, BMW 1 series, Vauxhall (Opel) Corsa and Astra. The list goes on for quite a while really.

    etc etc etc
     
  20. redrobin

    redrobin
    Expand Collapse

    Joined:
    Aug 21, 2012
    Messages:
    532
    Dog on seats vs. in the cargo area where the kids can still pet it. I don't know about you, but I wouldn't put my dog in the trunk of my car.
     
    • Agree Agree x 3
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice