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    • C8 Corvette LT2 Engine specs including bore x stroke, compression ratio, horsepower, torque - Same E99 ECU as C7 ZR1

      The C8 Corvette is here and now we can start looking forward to what these things will do in the hands of the aftermarket. GM decided to give the C8 Corvette the same E99 ECU that the C7 ZR1 is equipped with and that gave tuners plenty of trouble before being cracked.


      No doubt Chevy adjusted encryption or made changes to again make the Corvette tough to tune. Most of us though are salivating at the prospect of tuning the C8 which is just begging for some boost.

      Should tuners get in the C8 becomes an even greater performance value and frankly the best bargain in the business.

      The LT2 itself does not differ too much from the LT1. The main difference is that it is dry sump by default. The compression ratio and bore x stroke are the exact same as are the engine internals. The LT2 is rated higher though by 35 horses.

      Where do the extra horses come from? Redesigned intake and exhaust manifolds along with changes to the exhaust portion of the camshaft. Beyond that, even the 6600 rpm redline remains the same.

      The aftermarket will get more top end out of it with an aggressive cam and a ported set of heads. Hopefully revving the motor out more will not pose a problem for the TCU or ECU.


      This article was originally published in forum thread: C8 Corvette LT2 Engine specs including bore x stroke, compression ratio, horsepower, torque - Same E99 ECU as C7 ZR1 started by Sticky View original post
      Comments 26 Comments
      1. CobraMarty's Avatar
        CobraMarty -
        Max 150 bar HPFP leaves room for increased pressure and thus fuel, all thru the DI.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by CobraMarty Click here to enlarge
        Max 150 bar HPFP leaves room for increased pressure and thus fuel, all thru the DI.
        Plus these motors already have DI solutions available.

        I hate that everyone will be able to have one of these but I love the idea of the potential for 650+ naturally aspirated horses in a mid-engine layout with a killer sounding V8 mated to a DCT.

        I'm not sure how they will fit a blower on there but when they do oh man...
      1. BLKROKT's Avatar
        BLKROKT -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I'm not sure how they will fit a blower on there but when they do oh man...
        When you say that, this is the first thing I imagine sticking up through the glass and over the roof. That would look mental. Click here to enlarge

        Attachment 59154

        (yes, I realize thatís not possible, just kidding)
      1. Bowser330's Avatar
        Bowser330 -
        I want to see what it can do with some Nitrous, Nitrous is ALWAYS first.
      1. Torgus's Avatar
        Torgus -
        Click here to enlarge


        Click here to enlarge

        Hey look the designer and manufacturer of their DCT calls it an automatic transmission! Like everyone else except @Sticky Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        Hey look the designer and manufacturer of their DCT calls it an automatic transmission! Like everyone else except
        Everyone else doesn't. They wrote dual clutch but the auto is there for people who are morons and don't know the difference.

        Regardless, looks like the Z51 will get a 3.80 final drive. That makes me not want to opt for it as I would prefer the longer gearing.
      1. Torgus's Avatar
        Torgus -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Everyone else doesn't. They wrote dual clutch but the auto is there for people who are morons and don't know the difference.
        Everyone else doesn't? More like Sticky does not and everyone else calls it what it is, a type of automatic transmission:

        No only you think it is some new type of tranny. Go edit wikipedia if you think you are right https://en.wikipedia.org/wiki/Automatic_transmission



        Continuously variable transmissions[edit]

        Main article: Continuously variable transmission
        A fundamentally different type of automatic transmission is the continuously variable transmission, or CVT, which can smoothly and steplessly alter its gear ratio by varying the diameter of a pair of belt or chain-linked pulleys, wheels or cones. Some continuously variable transmissions use a hydrostatic drive — consisting of a variable displacement pump and a hydraulic motor — to transmit power without gears. Some early forms, such as the Hall system (which dates back to 1896[10]), used a fixed displacement pump and a variable displacement motor, and were designed to provide robust variable transmission for early commercial heavy motor vehicles.[11] CVT designs are usually as fuel efficient as manual transmissions in city driving, but early designs lose efficiency as engine speed increases.[12]
        A slightly different approach to CVT is the concept of toroidal CVT or infinitely variable transmission (IVT). These concepts provide zero and reverse gear ratios.
        E-CVT[edit]

        Main article: Hybrid Synergy Drive
        Some hybrid vehicles, notably those of Toyota, Lexus and Ford Motor Company, have an electronically controlled CVT (E-CVT). In this system, the transmission has fixed gears, but the ratio of wheel-speed to engine-speed can be continuously varied by controlling the speed of the third input to a differential using motor-generators.
        Dual-clutch transmissions[edit]

        Main article: Dual-clutch transmission
        A dual-clutch transmission, or DCT (sometimes referred to as a twin-clutch transmission or double-clutch transmission), is a modern type of semi-automatic transmission and electrohydraulic manual transmission. It uses two separate clutches for odd and even gear sets. It can fundamentally be described as two separate manual transmissions (with their respective clutches) contained within one housing, and working as one unit. They are usually operated in a fully automatic mode, and many also have the ability to allow the driver to manually shift gears in semi-automatic mode, albeit still using the transmission's electro-hydraulics.
        Automated Manual Transmission[edit]

        Also known as semi-automatic transmission (SAT) and several other names, this automatic transmission type utilizes a regular clutch and gear setup but automates the action by the use of sensors, actuators, processors, and pneumatics.[13] The AMTs were born out of the need to make automatic cars affordable and fuel efficient.[14] These are very simple and affordable. They're also not very expensive to repair. Fuel efficiency is their top priority and it rivals that of manual transmissions. AMT is based on an electronic control unit and a hydraulic system that supervise the use of the clutch and the gear shifting, allowing the driver to change gear without using the clutch, either sequentially or fully automatically.[15]


        ZF calls it a DCT a type automatic transmission. I think they know more than you do seeing as they build some of the best and most popular trannies around:

        https://www.zf.com/products/en/cars/products_29326.html

        Driveline -> Automatic Transmissions -> 7-Speed Dual Clutch Transmission


        No it's not marketing, it is a type of automated transmission.


        https://www.infiniumglobalresearch.c...mission-market go buy their market report for 5k and you can read all about how they are autos:


        There are many different types of automatic transmissions, which are developed over time, including the conventional automatic transmission (AT), the automated manual transmission (AMT), dual clutch automatic transmission (DCT) and continuously variable transmission (CVT).



        https://www.caranddriver.com/news/a1...transmissions/ <--car & driver call it an automatic


        It's an auto. The Designers, Manufactures, and Integrators(BMW, Chevy, etc.) all agree and call it such. Again, feel free to edit the wiki if everyone agrees your edit will stick.
      1. richpike's Avatar
        richpike -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Regardless, looks like the Z51 will get a 3.80 final drive. That makes me not want to opt for it as I would prefer the longer gearing.
        Why? It clearly puts the power down and the DCT has almost no loss on shifts. Seems the shorter gearing with good traction will more than make up for any tiny shift losses.

        -Rich
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        A dual-clutch transmission, or DCT (sometimes referred to as a twin-clutch transmission or double-clutch transmission), is a modern type of semi-automatic transmission and electrohydraulic manual transmission.
        LOL it's explained right there.

        If a dual clutch was an automatic there would be no need for the dual clutch distinction.

        Why do people say the Corvette now has a dual clutch after it had an automatic? Well?

        Why does Mercedes specify their automatic has a torque converter or not and if not why do they call it an MCT? Why specify TCT then?

        Click here to enlarge Originally Posted by AMG Click here to enlarge
        Speedy shifting: the AMG SPEEDSHIFT TCT 9G transmission
        The GLC 43 features the tried and tested AMG SPEEDSHIFT TCT
        9-speed automatic transmission (TCT = Torque-Converter Transmission)
        You have to be a complete retard to think a dual clutch is the same thing as an automatic. Give it a rest, you're wrong.
      1. Torgus's Avatar
        Torgus -
        In wikipedia DCT is filed under automatic transmission same with ZF, Chevy, etc Click here to enlarge

        Agree to disagree, no reason to call names.

        Attachment 59185
      1. Bowser330's Avatar
        Bowser330 -
        No one is arguing how great the DCT is, or how much better it is compared to other automatic transmissions.

        The automatic moniker is a category of transmission. So there is a reason to specify what sort of Automatic transmission it is.

        The Automatic transmission category includes variations such as:

        (1) Torque converter transmissions (ZF 8HP90)
        (2) non-Torque converter Wet/Dry Clutch based transmissions (e.g. MCT)
        (3) Continuously Variable Transmissions (CVT)
        (4) Dual Clutch Transmissions (DCT)

        All of the transmissions listed above have a computer controlled clutch or gear engagement where as a manual transmission has a driver controlled clutch and gear engagement.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        In wikipedia DCT is filed under automatic transmission same with ZF, Chevy, etc
        Oh ok it's not like anyone can edit wikipedia or anything.

        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        Agree to disagree, no reason to call names.
        This is not a matter of opinion. If someone can not process the difference between a dual clutch transmission and an automatic transmission they must suffer from some form of mental retardation.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Bowser330 Click here to enlarge
        The Automatic transmission category includes variations such as:

        (1) Torque converter transmissions (ZF 8HP90)
        That is what an automatic is.

        A CVT is a CVT and a DCT is a DCT.

        So when you shift a DCT manually is it a manual? The shift operation stems from the software. The physical hardware is completely different and has more in common with a manual box.

        Basic people only capable of superficial understandings will call it an automatic.

        This is what it is:

        [quote]In simple terms, a DSG automates two separate "manual" gearboxes (and clutches) contained within one housing and working as one unit. By using two independent clutches, a DSG can achieve faster shift times and eliminates the torque converter of a conventional epicyclic automatic transmission/quote]

        Not hard to grasp.
      1. Torgus's Avatar
        Torgus -
        I don't know why I bother to write this as I have better things to do they try and change your mind. It's not even worth the time and effort as once you believe something you will argue until the end of the earth you are right even when you are wrong. A personality flaw mind you Click here to enlarge There is nothing wrong in admitting your made a mistake or were incorrect. It is human nature.

        I take the word of the designers, manufacturers, and integrators of DCT auto trannys vs. the opinion of an online only automotive journalist/enthusiast or whatever you would classify yourself as. Go email ZF and tell them how they are wrong, get them to change their mind, then make a thread about it. That would be impressive.

        If it is so easy go edit the wiki and see if your 'opinion' stays. If you are right, which you are not mind you, your wiki edits will stay and you just fixed an inaccurate wiki article. You can then write an article for your network about that too.

        You will not do either mind you because they would be exercises in futility.

        A CVT and a DCT are both types of automatic transmissions where is shifting is automated. Clicking the paddle is not manually shifting as the software is in control 100% of the time. It does not allow you to money shift because the computer is controlling EVERYTHING and can negate any user input.

        [/quote]
        a DSG automates two separate "manual" gearboxes (and clutches) contained within one housing and working as one unit. By using two independent clutches, a DSG can achieve faster shift times and eliminates the torque converter of a conventional epicyclic automatic transmission
        Jesus that is the quote you want to use? Your quote LITERALLY calls it a type of automatic transmission. It is automated and not a tradition automated transmission with a TC. It still is a type of auto tranny. Your quote literally backs up what everyone else in the world knows. I think you are hung up and you believe for some weird reason an auto tranny has to have a TC which is 100% false and inaccurate.

        A DCT is not a traditional automated transmission with a TC, however it is still 100% automated and a type of automotive automated tranmission just like a CVT etc. There is not some magical 3rd and 4th a 5th type of automotive transmission. It is either a manual or a type of automated tranmission.
      1. Bowser330's Avatar
        Bowser330 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        That is what an automatic is.

        A CVT is a CVT and a DCT is a DCT.

        So when you shift a DCT manually is it a manual? The shift operation stems from the software. The physical hardware is completely different and has more in common with a manual box.

        Basic people only capable of superficial understandings will call it an automatic.

        This is what it is:
        In simple terms, a DSG automates two separate "manual" gearboxes (and clutches) contained within one housing and working as one unit. By using two independent clutches, a DSG can achieve faster shift times and eliminates the torque converter of a conventional epicyclic automatic transmission

        Not hard to grasp.
        99.9% of people drive the dct as any other automatic, rarely pulling the flappy paddle, yet the dct needs its own transmission category because sticky doesn’t like to be told he’s driving an automatic transmission.

        Id rather be basic than high maintenance.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        I don't know why I bother to write this as I have better things to do they try and change your mind.
        You can't change facts. It is hilarious you can't grasp such a simple concept though.

        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        I take the word of the designers, manufacturers, and integrators of DCT auto trannys vs. the opinion of an online only automotive journalist/enthusiast or whatever you would classify yourself as.
        They refer to the transmission as a DCT thereby proving the necessity for a separate classification. It's inherent, duh.

        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        A CVT and a DCT are both types of automatic transmissions where is shifting is automated. Clicking the paddle is not manually shifting as the software is in control 100% of the time. It does not allow you to money shift because the computer is controlling EVERYTHING and can negate any user input.
        You can have software that will not allow automatic $#@!s. Oh no now what? Is it a manual? Or is it simply the gear is changed by manual input? It is not suddenly a manual transmission. See the distinction?

        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        Jesus that is the quote you want to use? Your quote LITERALLY calls it a type of automatic transmission.
        This right here proves you have trouble with reading comprehension and understanding language.

        The quote does not call it an automatic. It says the clutch operation is automated simply because you do not have three feet. How are you going to modulate two clutches and the gas pedal?

        Automate and automatic are two different words. How can anyone have a discussion with you when you do not even understand basic vocabulary?

        You are applying the word automatic so broadly so as to encompass different transmission types. Why in the world does Chevy need to specify the new Corvette has a dual clutch? Why don't' they just say oh it has an automatic like the previous Corvette? Because it doesn't, duh.

        Why does Ford state the GT500 has a dual clutch transmission? Why don't they leave that out and just say it is an automatic? Because it isn't.

        You know what a DCT is? A DCT.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Bowser330 Click here to enlarge
        99.9% of people drive the dct as any other automatic, rarely pulling the flappy paddle, yet the dct needs its own transmission category because sticky doesn’t like to be told he’s driving an automatic transmission.

        Id rather be basic than high maintenance.
        How someone drives something does not define its physical properties. I could drive the PDK all day manually shifting I didn't suddenly change it into a manual transmission.

        The DCT does have its own transmission category, DUAL CLUTCH.

        CVT has its own category too.

        As does an automatic.

        Be basic I'd rather be intelligent.

        'OMG the DCT computer will shift for you that means it's an automatic!' No, it means it has automated shifting software. It's still a DCT.
      1. Torgus's Avatar
        Torgus -
        Jesus they are all types of automated tranmissions. You are hung up thinking an automatic has to have a TC. They made plenty of automatic transmissions without TCs over the years. Giving every one a unique designation does not make sense.

        Again, waste of time trying to convince you of anything once you have your mind made up.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        Jesus they are all types of automated tranmissions.
        Automated does not equal 'automatic' and even beyond that the physical makeup of a DCT is closer to a manual.

        Furthermore, if you shift it manually is it now a manual? Of course not.

        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        You are hung up thinking an automatic has to have a TC.
        This is what automatic traditionally denotes in automotive connotation which is why you have to specify a DCT is a DCT. SIMPLE.

        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        They made plenty of automatic transmissions without TCs over the years.
        Then why aren't they called automatics? Pretty sure each transmission has a name denoting what it is. MCT, DCT, CVT, DSG, ISR, etc.

        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        Again, waste of time trying to convince you of anything once you have your mind made up.
        You can't change facts.
      1. Torgus's Avatar
        Torgus -
        They are all called automatics. Every new transmission to the market does not just get it's own category. You just have it stuck in your head an automatic has to have a TC which is 100% false. Any time the shifting is automated it is a type of automatic transmission. It does not matter if it resembles a manual or resembles anything else.

        You have manual transmissions and automated transmissions. Everything else falls under one of those two categories.

        Just to make it clear the computer controls your DCT and the automatic shifting. You can't money shift it. You are never fully in control of it, the software is. It is a type of automatic transmission because you can't MANUALLY shift it. You can ask it to shift and the computer will either tell you yes or no because it is automated and controlled by something other than you.

        Again go edit wikipedia and go educate the engineers at ZF etc. that they are wrong. Go prove the engineers and designers of the automatic dual clutch transmissions that they are wrong. Would make a great article for your site. Go email them and try and convince them they are wrong or pick up the phone.

        Hell write an article for an online website other than your own. Literally NO ONE will publish an article saying DCTs are not a type of automatic transmission.