Z06 NOT getting Turbo FPC - 600 hp NA instead
09-01-2019, 10:18 AM
#101
IMSA Weathertech GTLM mandates a limit of 5.5L for ANY NA engine or 4.0L for any forced induction engine. The current C7.R is a destroked 6.2L LT1. The future C8.R engine could be a destroked LT2 NA engine OR a destroked 4.2 L Blackwing TT. A Turbo 5.5L, DOHC or OHV can't be used for IMSA racing.
What this means for the Z06 and ZR1 (or Zora) is TBD. My guess is even Juenter and Fehan don't know, however time is getting short, and they have to have a story for the C8.R race car soon. My bet is given whats in the base C8 and the competitive edge reliability gives you, the C8.R ends up with a 5.5 L NA destoked 6.2L OHV V-8. What that allows is a Z06 and Zora, unconstrained by IMSA and WEC rules, to go with a larger displacement TT engine.
What this means for the Z06 and ZR1 (or Zora) is TBD. My guess is even Juenter and Fehan don't know, however time is getting short, and they have to have a story for the C8.R race car soon. My bet is given whats in the base C8 and the competitive edge reliability gives you, the C8.R ends up with a 5.5 L NA destoked 6.2L OHV V-8. What that allows is a Z06 and Zora, unconstrained by IMSA and WEC rules, to go with a larger displacement TT engine.
As for the C8R, I sure hope that Juenter and Fehan have at least narrowed the alternatives and done some track work. As you say, time is getting VERY short for a good development program.
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23/C8Z (09-01-2019)
09-01-2019, 10:33 PM
#102
750+ HP Twin Turbo > 600 hp n/a
If no twin turbos for the C8 ZO6, I'll just buy a Z51 instead and wait to see what the C9 has to offer.
Maybe even used, so GM will have to wait 3 entire generations to get another Corvette sale from me.
Last edited by 2021 C8; 09-01-2019 at 10:38 PM.
09-01-2019, 11:12 PM
#104
Instructor
6.2L OHV production through 2021 in Y1 Corvette,
4.2L DOHC production in Y2 Corvette 2019 through 2024 report only goes through 2024.
5.5L DOHC Y2 Corvette 2019 through 2024 report only goes to 2024.
4.2L DOHC listed in Cadillac "Sports" and CT6 zero production expectation through 2024 -
So we're at a 6.2 OHV and a 5.5 DOHC for the Corvette. Interesting that the pdf in states the Y1 Vett will be in production until 2021. If the Y1 was the FME that doesn't compute.
And will we see a 4.2 in the Y2 this year as the chart shows?
The plot definitely thickens.
The 4.2 seems a bit of a question for the Corvette to me. If there are two different 4.2s, one for the Cad and one for the Corvette, the only reason to build one for the Corvette is to meet the BoP issues for the C8R?
4.2L DOHC production in Y2 Corvette 2019 through 2024 report only goes through 2024.
5.5L DOHC Y2 Corvette 2019 through 2024 report only goes to 2024.
4.2L DOHC listed in Cadillac "Sports" and CT6 zero production expectation through 2024 -
So we're at a 6.2 OHV and a 5.5 DOHC for the Corvette. Interesting that the pdf in states the Y1 Vett will be in production until 2021. If the Y1 was the FME that doesn't compute.
And will we see a 4.2 in the Y2 this year as the chart shows?
The plot definitely thickens.
The 4.2 seems a bit of a question for the Corvette to me. If there are two different 4.2s, one for the Cad and one for the Corvette, the only reason to build one for the Corvette is to meet the BoP issues for the C8R?
Eventually the 4.2 turbo becomes the base and the 5.5 turbo the z06?
09-02-2019, 02:30 AM
#105
A properly engineered twin turbo V8 doesn't suffer from lag.
Just look at all the current McLarens.
Please stop posting misinformation.
Thank you.
Why are you even posting in the C8 section, since you've posted you will not buy one without a clutch pedal?
Just look at all the current McLarens.
Please stop posting misinformation.
Thank you.
Why are you even posting in the C8 section, since you've posted you will not buy one without a clutch pedal?
Last edited by 2021 C8; 09-02-2019 at 02:38 AM.
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GeauxTigers1 (09-02-2019)
09-02-2019, 02:30 AM
#106
09-02-2019, 10:51 AM
#107
Racer
With ball-bearing or variable vaned turbos, lag isn't really an issue. Even an old Mitsubishi TD04 could provide plenty of boost at 1800 rpm and 26 lbs.@ 2500 rpm. It doesn't take a lot of engineering to get 750 hp out of a small block V8. Heck,
get 1600 hp, easily, out of an LS "daily driver" engine with their patented symmetrical (mirror-matched turbos with reverse rotation) setup.
09-02-2019, 04:39 PM
#108
Instructor
And from R&T: "and feeling noticeably less laggy in this incarnation" less laggy than the 650S but not lag-free.
All of the people being dramatic (ignorant) and saying things like "600 hp is weak" or "I'm not buying wo turbos" just need to be patient. Insane turbo power will show up on the C8 soon (all of the performance variants going forward will most likely receive turbos until a supposed all-electric version) the na 5.5 (if it actually comes to fruition) is most likely, our last chance to get the great, free-breathing engine that was so sorely missed on the C7.
For those of us who care, there is no replacement for a good NA powerplant, that's why no matter how fast and powerful the GT2 RS is, a large number of enthusiast drivers would take a GT3 every day and the C8 Z06 has the chance to be GM's GT3.
09-02-2019, 04:41 PM
#109
Burning Brakes
09-02-2019, 04:43 PM
#110
Burning Brakes
From autoblog's 720S Spyder test: "Foot to the floor, there's a brief moment right off idle where turbo lag almost makes the 720S Spider's engine feel like it may be a disappointment..."
And from R&T: "and feeling noticeably less laggy in this incarnation" less laggy than the 650S but not lag-free.
All of the people being dramatic (ignorant) and saying things like "600 hp is weak" or "I'm not buying wo turbos" just need to be patient. Insane turbo power will show up on the C8 soon (all of the performance variants going forward will most likely receive turbos until a supposed all-electric version) the na 5.5 (if it actually comes to fruition) is most likely, our last chance to get the great, free-breathing engine that was so sorely missed on the C7.
For those of us who care, there is no replacement for a good NA powerplant, that's why no matter how fast and powerful the GT2 RS is, a large number of enthusiast drivers would take a GT3 every day and the C8 Z06 has the chance to be GM's GT3.
And from R&T: "and feeling noticeably less laggy in this incarnation" less laggy than the 650S but not lag-free.
All of the people being dramatic (ignorant) and saying things like "600 hp is weak" or "I'm not buying wo turbos" just need to be patient. Insane turbo power will show up on the C8 soon (all of the performance variants going forward will most likely receive turbos until a supposed all-electric version) the na 5.5 (if it actually comes to fruition) is most likely, our last chance to get the great, free-breathing engine that was so sorely missed on the C7.
For those of us who care, there is no replacement for a good NA powerplant, that's why no matter how fast and powerful the GT2 RS is, a large number of enthusiast drivers would take a GT3 every day and the C8 Z06 has the chance to be GM's GT3.