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"BrainStorming" Twin Turbo Performance Enhancements

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  • "BrainStorming" Twin Turbo Performance Enhancements

    I know myself. I did just about 'everything ' possible to my 427 Z after I got it for HP and Torque. I am a Mod Junkie. I Can't help myself. I always have enjoyed steering a bullet.

    I am down for the TwinTurbo C8. It's a given at this point, just the when is obscure

    I am 29 on MacMulkin's reservation list .... possibly the 3rd week of production

    As insurance I am 42 on Les Stanford's list ... possibly 8th or 9th week of production.

    I like being on both lists at this point because what if the convertible or what if the Twin Turbo is not initially offered ?

    My question to All my Brethren here at this wonderful MidEngineCorvetteForum is this:

    What can be easily done to the Twin Turbo to increase HP and Torque ??

    I want to get another approximately 150 HP and Ft-lbs Tq at low RPMs.

    I hear that the spooling lag is noticeble. Can I use Nitrous ... like a 75 shot, not to blow her out, but to get her goin ?
    I also have read that the engine should run cooler while shooting.

    Is this idea readily feasible ?

    What, if Any, other Mods could be relatively easily utilized to garner another 75 HP and Ft-LBs ??
    Electric water pump ?? Any bolt-ons that you Pros know about ??
    Any tweaking that would be possible on a DYNO ??
    Any ideas ???

    Thank You In Advance Everyone
    Last edited by Adrenaline Junky; 05-21-2019, 06:06 PM.

  • #2
    Help us to understand please. Are you discussing changes to a C6 427 cubic inch motor? Or are you thinking and planning about changes you might undertake on your upcoming C8?

    If you are asking re a TT C8, most believe that there would not be a twin turbo motor in a C8 until year two, that only a OHV, naturally aspirated LT2 would be offered in the 2020 model year, if nothing else but based that the leaked C8 specs only list one motor as follows.

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    Lifetime, annual contributors, and 20+ year members of National Corvette Museum.

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    • #3
      Power gains are easy on a turbocharged engine. Swap in a few high flow cats (or catless downpipes), get it tuned (basically turn up the boost), and strap in.

      You mentioned turbo lag, but GM's twin turbo engines have gotten quite good with minimizing lag, for example the LF4 V6TT in the ATS-V feels much like an NA DOHC engine. If they were to use some higher tech turbo designs in the C8's LT7 then it's possible to do even better. Some aren't even very expensive, like variable twin scroll turbos which direct all exhaust into a single scroll at low rpms for quicker spooling.

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      • #4
        ^^ 100%.

        Flashing the ECU to run higher boost is the largest gain you will get (and it will be material). This is akin to the supercharged crowd running a different pulley.

        For the turbo lag, modern twin turbos completely get rid of this. The point of twin turbos is that they are different sizes and create boost at different RPM levels (ie. one for lower RPM and the other for higher).

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        • #5
          Many modern turbo cars, FBO+E85 (Full Bolt On) will net those results fairly often. This usually entails intake piping (keep stock manifold), down pipes, exhaust, fuel injectors (fuel pump may be needed) / ethanol sensor, and a tune.

          As for lag, many new turbo vehicles have the hotside of the turbo built into the exhaust manifold. This reduces lag and increases spooling. See photo for comparison between "traditional" turbo, and integrated hotside (GT-R manifold).




          As for N02, is your thought to use it to spool the turbo, or to increase power before it hits peak boost? Either way, a 75 shot is going to be more work than it's worth. Also, I call it situational horsepower. Have to ensure it's the proper temp/pressure, that's it's filled, switched on, and correct tune.

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          • #6
            Originally posted by smoove7410 View Post
            ^^ 100%.

            Flashing the ECU to run higher boost is the largest gain you will get (and it will be material). This is akin to the supercharged crowd running a different pulley.

            For the turbo lag, modern twin turbos completely get rid of this. The point of twin turbos is that they are different sizes and create boost at different RPM levels (ie. one for lower RPM and the other for higher).
            You're thinking of sequential turbo setup. TT setup on a V engine has same sized snails of each side.

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            • #7
              Wow !! Thank you all for the Input.

              I knew I came to the "right" place to ask the question.

              Can't wait to get one.

              (( Looks like there would be no necessity to shoot Nitrous, which is perfect. ))

              Thank you once again. I will keep in touch once they get into production.



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              • #8
                Originally posted by Adrenaline Junky View Post
                Wow !! Thank you all for the Input.

                I knew I came to the "right" place to ask the question.

                Can't wait to get one.

                (( Looks like there would be no necessity to shoot Nitrous, which is perfect. ))

                Thank you once again. I will keep in touch once they get into production.


                But you didn't answer John's question, which was my question as well. First year C8 is based on LT2 N/A. GM hasn't confirmed what the other engines are.

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                • #9
                  Originally posted by Z_Rocks View Post

                  But you didn't answer John's question, which was my question as well. First year C8 is based on LT2 N/A. GM hasn't confirmed what the other engines are.
                  Sorry, I am just presuming that was an order sheet for one specific car and not one with All the options.

                  If it only comes as the "new" 6.2L naturally aspirated version at first, I, along with probably 33% of the potential Buyers would be disappointed. Although I might still bite and sell it above MSRP on the West Coast and then get Q'd back up with a big dealer again for the Twin Turbo......

                  BUT something tells me that they didn't make those changes to the Bowling Green factory (( differentiated assemblage )) just for the "L" of it

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