[TheRealJA105]

Originally Posted by RobbyBeefcake87

This. Pretty much what everyone with a brain who can reason was saying about VIR full. Run them at VIR grand and it would have probably been similar to what SP experienced.

Yep they had to cater to Ford. Yet, Mustang Fanboizz love to claim that Motor Trend and more so Randy are GM nut huggers.

[whiteboyblues2001]

Meanwhile, over at Cadillac....

SO, while we are rightfully ooohing and aaaahing over the new C8 release, and high-fiving each other over the Z06 rumors coming true, then there is Cadillac...

Cadillac had a great pair of cars in the CTS-V and ATS-V, but they also had a CTS VSport which wasn't as potent as the CTS-V, as you all probably already know. But now they are going to the CT4, CT5 and CT6. Okay. Then they released a CT6-V, with a Blackwing engine (4.2L V8 TT Hot-V config for 550 HP). So, the CT6-V version ended up with 100 less HP than the old CTS-V, which was disappointing. BUT, they were saying the new "V" is like the old "VSport", and there will be a more powerfull trim in the future perhaps with "Blackwing" in the name...

And, so now, they testing a new CT5 called the "CT5-V Blackwing", So does it have a new version of the Blackwing engine with more HP? NO. It's an LT4. Yes, you heard that right, the new CT5-V Blackwing, does not have a Blackwing engine, instead it has an LT4 that puts out the same 650 HP. Which is more HP than the Blackwing engine, but this is a trim level car named Blackwing.

Anyone confused yet?

You can get a "CT6-V" with a "Blackwing" engine, or you can get a "CT5-V Blackwing" without a "Blackwing" engine.

What a hot mess. Why does GM insist on naming conventions that defy any convention? Trying to figure out all the 1LT, LT1, 1LE, 2LT, etc. is harder than trying to figure out NSA's wifi password. Why does Cadillac insist on having it's own engines, then keep using the LT4? Why not share engines with Chevy, it's not like they aren't kick-a$$ engines that everyone would want in a luxury sedan/coupe.

https://www.motor1.com/news/410117/c...ckwing-650-hp/

[NW-99SS]

Cadillac has destroyed their naming conventions...will take another decade to recover. Whoever approved any of this should be unemployed.

[IneedAZ]

Did you see this ?
Model Year Engine Power (est.) Torque (est.) Likely Application
2021 LT2 6.2-liter 16-valve OHV 490-495 hp 465-470 lb-ft RHD Corvettes for export
2022 LT6 5.5-liter 32-valve DOHC 650 hp 600 lb-ft Corvette Z06
2023 LT2 6.2-liter 16-valve OHV hybrid 600 hp 500 lb-ft Corvette Grand Sport
2024 LT7 5.5-liter twin-turbo DOHC 850 hp 825 lb-ft Corvette ZR1
2025 LT7HP1 5.5-liter twin-turbo DOHC hybrid 1,000 hp 975 lb-ft Corvette Zora

https://www.motor1.com/news/414264/c...future-leaked/

[Bhobbs]

I don’t see an n/a 5.5l making 600 lb ft of torque. It would probably be quite a bit less.

[whiteboyblues2001]

Originally Posted by IneedAZ

Did you see this ?
Model Year Engine Power (est.) Torque (est.) Likely Application
2021 LT2 6.2-liter 16-valve OHV 490-495 hp 465-470 lb-ft RHD Corvettes for export
2022 LT6 5.5-liter 32-valve DOHC 650 hp 600 lb-ft Corvette Z06
2023 LT2 6.2-liter 16-valve OHV hybrid 600 hp 500 lb-ft Corvette Grand Sport
2024 LT7 5.5-liter twin-turbo DOHC 850 hp 825 lb-ft Corvette ZR1
2025 LT7HP1 5.5-liter twin-turbo DOHC hybrid 1,000 hp 975 lb-ft Corvette Zora

https://www.motor1.com/news/414264/c...future-leaked/

Yes, but I have some suspicions about accuracy. How would a 5.5L N/A motor make 600 lbft of torque? That's not going to happen. Plus, if you take 600 lbft of torque and multiply by 8000+ rpms (and divide by 5252 to get the correct units), you will get a LOT more than 650 HP.

You can estimate the RPMs that any engine make PEAK HP at by how close or far apart the HP and TQ numbers are. Equal numbers will give a peak near 6,000 RPMS. having 600 lbft and 650 HP suggests a peak HP RPMs of around 6500 or so, which would put redline at 7,000 RPMs. That's a very rough estimate of course, as there are many unknown factors, but any engine that revs to the moon will have MUCH less peak TQ than peak HP. So, the Z06 engine numbers seem to defy physics.

[Martinjlm]

Originally Posted by IneedAZ

Did you see this ?
Model Year Engine Power (est.) Torque (est.) Likely Application
2021 LT2 6.2-liter 16-valve OHV 490-495 hp 465-470 lb-ft RHD Corvettes for export
2022 LT6 5.5-liter 32-valve DOHC 650 hp 600 lb-ft Corvette Z06
2023 LT2 6.2-liter 16-valve OHV hybrid 600 hp 500 lb-ft Corvette Grand Sport
2024 LT7 5.5-liter twin-turbo DOHC 850 hp 825 lb-ft Corvette ZR1
2025 LT7HP1 5.5-liter twin-turbo DOHC hybrid 1,000 hp 975 lb-ft Corvette Zora

https://www.motor1.com/news/414264/c...future-leaked/

For me, this is almost chuckle-worthy. When I first started working at IHS-Markit, I intentionally did not take on the GM portfolio forecasting. I didn’t have an NDA or non-compete because I retired, as opposed to quitting to take another job, but I still wanted to maintain a 1-yr hands off of GM stuff just to maintain a position of plausible deniability (ie - I didn’t walk in with a basket full of secret documents). But I do have a fairly decent memory.

I took on GM after a year at IHS-M. The guy who had the deck before me had:

LT6 @ 650 hp / 600 lb-ft. I changed it to 600 / 500
LT7 @ 850 hp / 825 lb-ft. I changed it to 750 / 750, 750 / 922 for the hybrid
We agreed on the LT7 hybrid being a total system output of 1,000 / 975

I’m thinking Motor1 got their info from an old report of one of our forecasts. I made my changes about a year ago.

[whiteboyblues2001]

Originally Posted by Martinjlm

For me, this is almost chuckle-worthy. When I first started working at IHS-Markit, I intentionally did not take on the GM portfolio forecasting. I didn’t have an NDA or non-compete because I retired, as opposed to quitting to take another job, but I still wanted to maintain a 1-yr hands off of GM stuff just to maintain a position of plausible deniability (ie - I didn’t walk in with a basket full of secret documents). But I do have a fairly decent memory.

I took on GM after a year at IHS-M. The guy who had the deck before me had:

LT6 @ 650 hp / 600 lb-ft. I changed it to 600 / 500
LT7 @ 850 hp / 825 lb-ft. I changed it to 750 / 750, 750 / 922 for the hybrid
We agreed on the LT7 hybrid being a total system output of 1,000 / 975

I’m thinking Motor1 got their info from an old report of one of our forecasts. I made my changes about a year ago.

Wow! Thanks again Jim, for your insight!

For the LT6 I was thinking more like 600/450, so your numbers suggest a lower peak HP RPM number than I though too. 8000 rather than 8,500? 500 lbft is a great number for 5.5L.

I'm editing this post regarding the LT7 because I missread Jim's statement. The LT7 should have peak RPMs around 6000 or so, which is good for a turbo, as many turbo engines peak early in RPM band.

[NW-99SS]

Originally Posted by whiteboyblues2001

Wow! Thanks again Jim, for your insight!

So the LT7 will have a low peak HP RPM number, common in turbo applications. I'm thinking 5000-5500. For the LT6 I was thinking more like 600/450, so your numbers suggest a lower peak HP RPM number than I though too. 8000 rather than 8,500? 500 lbft is a great number for 5.5L.

8000 is plenty - even the Voodoo only offer 8250 briefly and only for so much time.

[whiteboyblues2001]

Originally Posted by NW-99SS

8000 is plenty - even the Voodoo only offer 8250 briefly and only for so much time.

Trust me, I WANT less RPMs in the peak number. It means more torque, and more torque down low. I was just going with what I thought the most reliable rumors seemed to indicate. I don't have the industry expertise as Jim, of course...

[NW-99SS]

Originally Posted by whiteboyblues2001

Trust me, I WANT less RPMs in the peak number. It means more torque, and more torque down low. I was just going with what I thought the most reliable rumors seemed to indicate. I don't have the industry expertise as Jim, of course...

Agreed - somewhat. If the Z06 is an NA track weapon, I'm ok with high RPM as long as every review and old waxxer that buys one doesn't complain about it...they should have just bought a regular Stingray or wait for the ZR1/Zora.

As always - Jim with the insider edge to clarify the funky info - thanks!

[Martinjlm]

Originally Posted by whiteboyblues2001

Wow! Thanks again Jim, for your insight!

So the LT7 will have a low peak HP RPM number, common in turbo applications. I'm thinking 6000. For the LT6 I was thinking more like 600/450, so your numbers suggest a lower peak HP RPM number than I though too. 8000 rather than 8,500? 500 lbft is a great number for 5.5L.

Actually, it would be simpler for me to "show you my work" as they say in high school. I often use an online HP calculator and then based on what I know and what I assume, I plug and crank. These are my actual workups for LT6 and LT7 with some annotation. I'll fine tune them as I learn more details. For example, I assumed the engine square and backed into a 5.5L displacement. If it comes in under square or over square I'll have to tweak the bore and stroke to get the same displacement and see where that sends my hp estimates.

[whiteboyblues2001]

Originally Posted by NW-99SS

Agreed - somewhat. If the Z06 is an NA track weapon, I'm ok with high RPM as long as every review and old waxxer that buys one doesn't complain about it...they should have just bought a regular Stingray or wait for the ZR1/Zora.

As always - Jim with the insider edge to clarify the funky info - thanks!

Agreed completely. High RPM screamer is great for road course track car applications, and that has been part of Z06 history. But, my personal preference is a more balanced powerband engine. I totally geek out on the thought of a 5.5L N/A FPC Z06, but if I were in the market for something similar, I would probably wait for the ZR1 version. Or perhaps the Grand Sport, depending on how that turns out...

[NW-99SS]

Originally Posted by whiteboyblues2001

Agreed completely. High RPM screamer is great for road course track car applications, and that has been part of Z06 history. But, my personal preference is a more balanced powerband engine. I totally geek out on the thought of a 5.5L N/A FPC Z06, but if I were in the market for something similar, I would probably wait for the ZR1 version. Or perhaps the Grand Sport, depending on how that turns out...

Same - I actually want to put a H/C LS7 and TR6060 in my Grand Sport eventually. Love the LS7 RPM range AND torque. Just a great NA engine once the valve guides are addressed.