[Blackdevil77]

Agreed, I'm willing to bet almost anything that somebody is gonna hit 10's with a stock ZL1 in stock form at a track like ATCO. It's just a matter of when.

[Blackdevil77]

Skip to 6:51. 2 dynographs are shown, one of the Hellcat, the other of the ZL1. Forget about the peak numbers and everything, I'm curious, why does the torque in the LT4 gradually drop as it approaches redline while the Hellcat torque curve remains relatively flat all the way to redline? What would we have to change in the LT4 to get a similar looking torque curve? Seems like that torque up there would be beneficial, especially for the A10 guys with those short gears since the car would be spending a lot of time in that RPM range at WOT.

[JB'sZL1]

Originally Posted by Blackdevil77

What would we have to change in the LT4 to get a similar looking torque curve?

From what I've read the new Z gives the HC a run for its money as is. I would imagine exhaust work and a good tune would increase the torque.

[NicD]

Originally Posted by HAMMERHEAD15

It is certainly not as simple as hitting the gas and driving straight! Some tracks have better traction and the two I run at usually do pretty good but you can't use all the power at launch with out blowing the tires!

Doesn't sound like very good tracks then because I can basically hammer down from a stop light on the street and it mostly sticks and it's not even a prepped surface. And so what if you have to roll into it at the track, let's not pretend that is a difficult task. It's literally point and shoot and that's a testament to how well done this car is.

[NicD]

Originally Posted by Blackdevil77

Forget about the peak numbers and everything, I'm curious, why does the torque in the LT4 gradually drop as it approaches redline while the Hellcat torque curve remains relatively flat all the way to redline?

It's a combination of the pathetically small stock LT-4 camshaft, the smaller blower, and less head flow. But the majority of it is the small cam and even a "small" aftermarket cam will fix it right up.

[Can'tHave2MuchHP]

Originally Posted by NicD

It's a combination of the pathetically small stock LT-4 camshaft, the smaller blower, and less head flow. But the majority of it is the small cam and even a "small" aftermarket cam will fix it right up.

THIS^

Even putting in a "baby" cam gains big for the LT4. I know a guy that put a cam that's not even considered a stage 1 cam, hardly any chop at idle, and put up good power and a better curve while driving as good or better than stock.

[ninetres]

Originally Posted by Blackdevil77

Skip to 6:51. 2 dynographs are shown, one of the Hellcat, the other of the ZL1. Forget about the peak numbers and everything, I'm curious, why does the torque in the LT4 gradually drop as it approaches redline while the Hellcat torque curve remains relatively flat all the way to redline? What would we have to change in the LT4 to get a similar looking torque curve? Seems like that torque up there would be beneficial, especially for the A10 guys with those short gears since the car would be spending a lot of time in that RPM range at WOT.

The real question at hand here is how did you sit through 6+ mins of some random guy talking to get to the graphs?!?! Or is that you? Haha

[Blackdevil77]

Originally Posted by JB'sZL1

From what I've read the new Z gives the HC a run for its money as is. I would imagine exhaust work and a good tune would increase the torque.

Yeah definitely, I saw the Hennessey videos as well of the auto Hellcat vs auto ZL1. They look damn near identical. The weight difference is what makes them that closely matched IMO.

Originally Posted by NicD

It's a combination of the pathetically small stock LT-4 camshaft, the smaller blower, and less head flow. But the majority of it is the small cam and even a "small" aftermarket cam will fix it right up.

I wonder why GM went with such a small cam in the LT4? What does a cam swap entail on the LT4? Do the heads have to come off? I'm more familiar with the LS engines.

Originally Posted by ninetres

The real question at hand here is how did you sit through 6+ mins of some random guy talking to get to the graphs?!?! Or is that you? Haha

Lmao, I know the guy, we have the same car currently. I've been searching for "ZL1 vs Hellcat" on youtube on a daily basis and sort the videos by recently uploaded and came across his video. I was skipping around and saw the graph.

[Blackdevil77]

This is good info as well all on one sheet.

[Speedy1975]

I think the reason the torque falls off is the baby blower they put on the ZL1. 1.7L ?? It's also likely maxed out as is on that big 6.2L engine. Hellcat pulley swap and tune and you're talking 800+RWHP easy and 9s in the 1/4.

I think a larger SC like the Whipple 2.9 or similar would make a huge difference on the ZL1.

I've personally played with my buddy's C7 Z06 and I expected it to pull on me in my Hellcat and it did not. 50 - 150 we were side by side. I figure C7 Z06 weighs less than the ZL1 (?) so not sure how one will actually do against a Hellcat with a someone that knows what they're doing. The MPH in the 1/4 seems similar so that is something to keep an eye on as that will really tell the tale. Hoping the guy who posted slips earlier can hit Beech Bend with me this fall and we can do some compares and maybe a little fun grudge race.

[NicD]

Originally Posted by Blackdevil77

I wonder why GM went with such a small cam in the LT4? What does a cam swap entail on the LT4? Do the heads have to come off? I'm more familiar with the LS engines.

Emissions and they hit their power target so no need to go larger. Cam swaps on these newer motors are not fun and a lot of work. Plus you are generally getting rid of the DOD lifters at the same time so you would be pulling heads.

Originally Posted by Blackdevil77

This is good info as well all on one sheet.

That sheet isn't really very accurate. The cam durations are WAY off, the LT4 is using the .050 specs and the Hellcat is showing total advertised duration.

[Blackdevil77]

Originally Posted by NicD

Emissions and they hit their power target so no need to go larger. Cam swaps on these newer motors are not fun and a lot of work. Plus you are generally getting rid of the DOD lifters at the same time so you would be pulling heads.


That sheet isn't really very accurate. The cam durations are WAY off, the LT4 is using the .050 specs and the Hellcat is showing total advertised duration.

Sounds like a cam is out of the question then.

Where can you find the accurate specs? I tried googling it and can't seem to find anything straight forward for the Hellcat, which is surprising.

[HAMMERHEAD15]

Originally Posted by 2NASSTY

You A10 Guys crack me up. Yeah believe me, it is that easy in a Auto.

Back on topic, I do believe the ZL1 A10 will dip into the 10s in -DA at ATCO, MIR bone stock factory tire. I also expect to see 130-132 MPH trap speeds.

I feel for the M6 Guys. I honestly believe they will have to void their warranty to make this Car work at the strip. It will happen though. Somebody on here that wants it bad enough will make it work.

I guess that's why everybody is running low 11's! Lmao just mash the gas and hold it straight!

[HAMMERHEAD15]

Originally Posted by NicD

Doesn't sound like very good tracks then because I can basically hammer down from a stop light on the street and it mostly sticks and it's not even a prepped surface. And so what if you have to roll into it at the track, let's not pretend that is a difficult task. It's literally point and shoot and that's a testament to how well done this car is.

I can hammer down in 2nd gear at 25 mph and smoke the tires. Stock tires.