[Mister Will]

Originally Posted by TheSpectre

I just pray it's worthy of the ZL1 name, i.e. bulletproof. The LT4 so far has proven rather fragile (in conjunction with the auto trans).

While I haven't been following every thread or magazine report on the LT4 and the C7 Zo6, could you define fragile?

What I understand is the problem is that the Z06s have been overheating and the ECM has been cutting power to preserve the engine. This is a heating issue. Which is not too surprising since we are talking about a
block mounted supercharger subject to heat soak under prolonged operating conditions. I wouldn't exactly call that fragile.

What's surprising is that GM allowed this on their "race ready" flagship. Which would go a few laps then lose power. Disappointing to say the least. But that would make the LT4 fragile.

[RJT Impala]

Originally Posted by BoostedX2

I recently saw a hellcat on the showroom...looked awesome. I hope the new ZL1 lives up to its performance and looks when compared to the hellcat. I also recently drove a non scat pak challenger, and was not impressed with the driving...it was a boat!

Put 2000 miles on a Scat Pak Challenger this summer (rental). Not equal to Camaro in handling, but a great car nonetheless! Lowering and suspension changes made it handle nicely. Six-speed manual made it fun to drive. Mostly interstate (Salt Lake to Seattle and return) and averaged 26+ mpg at 70-75 mph. Wife was ready to trade in our 2014 Malibu 2.0 Turbo. Scat Pak is the only version I would consider.

[Tr6]

Originally Posted by RJT Impala

Put 2000 miles on a Scat Pak Challenger this summer (rental). Not equal to Camaro in handling, but a great car nonetheless! Lowering and suspension changes made it handle nicely. Six-speed manual made it fun to drive. Mostly interstate (Salt Lake to Seattle and return) and averaged 26+ mpg at 70-75 mph. Wife was ready to trade in our 2014 Malibu 2.0 Turbo. Scat Pak is the only version I would consider.

They all just feeling like a BOAT for me. I couldn't do it. I drove the Scat Pak and STR8, havent driven a hellcat but I am sure it would still feel like a boat, juts a crazy fast one... If I am going to get a coupe, I want the power and as nimble as possible.

[mcsoul]

For the purpose of argument , lets assume it gets the same 640hp LT-4 variant as the CTS-V. It will also be Mag-Ride/NPP only like the last gen and full on 2SS only.

The new Z06 at 3530 lbs (MANUAL) 3558 (AUTO) lbs will run:

0-60: 3.1 (AUTO)
0-60: 3.3 (MANUAL)
1/4 mi: 11.1 (AUTO)
1/4 mi: 11.5 (MANUAL)

The new CTS-V at 4140 lbs will run:

0-60: 3.6 (AUTO)
1/4 mi: 11.8 (AUTO)

The C7 Z-51 manual weighs 3444 so about 90 lbs less than the Z06. Lets add the 90 lbs to the fully optioned 2SS weight of the C&D SS tested at 3760 lbs for a total of 3850 lbs for the ZLI. This would put it neatly between the CTS-V and Z06 in terms of weight.

So ZLI predictions at 3850 lbs (AUTO) and 3825 lbs (MANUAL) are:

0-60: 3.3 (AUTO)
0-60: 3.5 (MANUAL)
1/4 mi: 11.3 (AUTO)
1/4 mi: 11.6 (MANUAL)

Sound reasonable? Because a ZLI with specs like that will be world class!

[MuhThugga]

Originally Posted by Mister Will

While I haven't been following every thread or magazine report on the LT4 and the C7 Zo6, could you define fragile?

What I understand is the problem is that the Z06s have been overheating and the ECM has been cutting power to preserve the engine. This is a heating issue. Which is not too surprising since we are talking about a
block mounted supercharger subject to heat soak under prolonged operating conditions. I wouldn't exactly call that fragile.

What's surprising is that GM allowed this on their "race ready" flagship. Which would go a few laps then lose power. Disappointing to say the least. But that would make the LT4 fragile.

There have been overheating issues, but there have also been complete failures where the engine went ka-blooey. It is surprising given how the LS9 and LSA have been dead-nuts reliable.

[GretchenGotGrowl]

Originally Posted by MuhThugga

There have been overheating issues, but there have also been complete failures where the engine went ka-blooey. It is surprising given how the LS9 and LSA have been dead-nuts reliable.

You aren't rwally going to say no LSAs failed are you?

[OldJedi]

Originally Posted by mcsoul

For the purpose of argument , lets assume it gets the same 640hp LT-4 variant as the CTS-V. It will also be Mag-Ride/NPP only like the last gen and full on 2SS only.

The new Z06 at 3530 lbs (MANUAL) 3558 (AUTO) lbs will run:

0-60: 3.1 (AUTO)
0-60: 3.3 (MANUAL)
1/4 mi: 11.1 (AUTO)
1/4 mi: 11.5 (MANUAL)

The new CTS-V at 4140 lbs will run:

0-60: 3.6 (AUTO)
1/4 mi: 11.8 (AUTO)

The C7 Z-51 manual weighs 3444 so about 90 lbs less than the Z06. Lets add the 90 lbs to the fully optioned 2SS weight of the C&D SS tested at 3760 lbs for a total of 3850 lbs for the ZLI. This would put it neatly between the CTS-V and Z06 in terms of weight.

So ZLI predictions at 3850 lbs (AUTO) and 3825 lbs (MANUAL) are:

0-60: 3.3 (AUTO)
0-60: 3.5 (MANUAL)
1/4 mi: 11.3 (AUTO)
1/4 mi: 11.6 (MANUAL)

Sound reasonable? Because a ZLI with specs like that will be world class!

Your numbers and rationale look good. This would make the Gen 6 ZL1 about a full second faster than Gen 5 ZL1's.

[MuhThugga]

Originally Posted by GretchenGotGrowl

You aren't rwally going to say no LSAs failed are you?

None? No.

The track record is far better than what the LT4 has been, though.

[GretchenGotGrowl]

Originally Posted by MuhThugga

None? No.

The track record is far better than what the LT4 has been, though.

The LT4 has been out a year. How can you reasonably compare the two? What is the failure rate for the LT4 so far? Don't cite how many threads you have seen...what is the official number that have failed? This is a new engine in a new generation, so everyone should expect some initial quality issues. Given close to 9,000 have been produced, a dozen or so failures (if it is even that many) would be peanuts. Of those that have failed, how many came before the oil tapping issue was discovered and corrected? How many resulted from people not following the new oil change routine? How many owners didn't follow the recommended break-in procedure? The internet is full of stories, but real data a facts are hard to come by this early in the lifecycle of this engine

[mt3130]

Originally Posted by GretchenGotGrowl

The LT4 has been out a year. How can you reasonably compare the two? What is the failure rate for the LT4 so far? Don't cite how many threads you have seen...what is the official number that have failed? This is a new engine in a new generation, so everyone should expect some initial quality issues. Given close to 9,000 have been produced, a dozen or so failures (if it is even that many) would be peanuts. Of those that have failed, how many came before the oil tapping issue was discovered and corrected? How many resulted from people not following the new oil change routine? How many owners didn't follow the recommended break-in procedure? The internet is full of stories, but real data a facts are hard to come by this early in the lifecycle of this engine

There are a shockingly high number of people sports car forums that don't follow the manufacturer break in guidelines.

[khell86]

Originally Posted by GretchenGotGrowl

The LT4 has been out a year. How can you reasonably compare the two? What is the failure rate for the LT4 so far? Don't cite how many threads you have seen...what is the official number that have failed? This is a new engine in a new generation, so everyone should expect some initial quality issues. Given close to 9,000 have been produced, a dozen or so failures (if it is even that many) would be peanuts. Of those that have failed, how many came before the oil tapping issue was discovered and corrected? How many resulted from people not following the new oil change routine? How many owners didn't follow the recommended break-in procedure? The internet is full of stories, but real data a facts are hard to come by this early in the lifecycle of this engine

I haven't seen anything official from GM, but ive seen a few sites say there's been over 300 LT4 engine failures with around 6000 produced.

[GretchenGotGrowl]

Originally Posted by khell86

I haven't seen anything official from GM, but ive seen a few sites say there's been over 300 LT4 engine failures with around 6000 produced.

Well, they produced almost 9000 Z06 in 2015 and now we have the CTS-Vs out there. So, even if 300 is correct (and I doubt it), that would be 3%. How many of those are because people didn't follow the break-in procedure or do the 500 mile oil change?

[i2disturbedSS]

Originally Posted by mcsoul

For the purpose of argument , lets assume it gets the same 640hp LT-4 variant as the CTS-V. It will also be Mag-Ride/NPP only like the last gen and full on 2SS only.

The new Z06 at 3530 lbs (MANUAL) 3558 (AUTO) lbs will run:

0-60: 3.1 (AUTO)
0-60: 3.3 (MANUAL)
1/4 mi: 11.1 (AUTO)
1/4 mi: 11.5 (MANUAL)

The new CTS-V at 4140 lbs will run:

0-60: 3.6 (AUTO)
1/4 mi: 11.8 (AUTO)

The C7 Z-51 manual weighs 3444 so about 90 lbs less than the Z06. Lets add the 90 lbs to the fully optioned 2SS weight of the C&D SS tested at 3760 lbs for a total of 3850 lbs for the ZLI. This would put it neatly between the CTS-V and Z06 in terms of weight.

So ZLI predictions at 3850 lbs (AUTO) and 3825 lbs (MANUAL) are:

0-60: 3.3 (AUTO)
0-60: 3.5 (MANUAL)
1/4 mi: 11.3 (AUTO)
1/4 mi: 11.6 (MANUAL)

Sound reasonable? Because a ZLI with specs like that will be world class!

That was my thinking as well

[ChefBorOzzy]

I'd put the ZL1 weight at around 3,950.