DSX Lid Whine Results

[iriv23]

Background: Sold my Durango Hellcat and bought a CT5-V Blackwing back in December. My favorite car I’ve ever driven with ONE problem… not enough whine. My favorite cars have always been hellcats purely because of the sound, and I miss the loud whine my Durango had (with a JLT intake).

After tons of research I finally pulled trigger on a DSX lid and did the install today. Attached are before and after videos with the hood open and some revs in neutral while coasting in sport mode. I do have custom magnaflow mufflers as well.

From the outside the whine is about twice as loud, but I still can barely hear anything from the inside. I do hear it slightly at higher RPMs. The exhaust is definitely partly to blame.

Looks like porting the supercharger + pulley is next. Didn’t want to get void my warranty but that’s how much I want the supercharger sound… The search for the louder whine continues!

 

[iriv23]

Oops, forgot the before and after. Here it is: Supercharger Whine Before And After

 

[jbawden]

Don't count on the Kong port adding much, maybe 10-15% more and mostly at high RPM. I'm know I'm getting older when I like the subtle whine and stock stance of the 5BW, its perfect.

 

[hawk02]

I’m not into my car sounding like a bunch of angry bees. I think the Cadillac team did a nice job balancing luxury with performance. The exhaust sound should be the main focus under load and not supercharger whine. But that’s me.

 

[Sully]

I too wanted to hear that SC more then it came stock. My MPI lid gave me more then enough whine, especially under load, very pleased with it. Combined with a green filter and Corsa exhaust, almost negated it as exhaust burble is next-level crazy.

 

[coffee_time]

Voiding a warranty on a six-figure car just for a sound is wild to me.

 

[PrimeTime]

I have to say I agree with you @coffee_time, the powertrain warranty is just too important to me. Rather have it than not.

That said what "bolt ons" mods would be considered "acceptable" under the cars powertrain warranty? If any? Does a new LID void the warranty?

Does a bolt on catch can, which to me performs an important task in the performance and condition of SC, its cooling bricks void the warranty? IDK?

 

[Sully]

Voiding a warranty on a six-figure car just for a sound is wild to me.

Neither lid nor exhaust voided my warranty. When my transmission was replaced (see Thread 'Sidewall Bump.. (morphed into Transmission replacement)' the dealer initially took notice of the lid, initially refused to work on it because they said I installed a “blower”, which was comical.

But after explaining that the BW came with the blower (not sure why I needed to explain but I chalk it up to the service advisor never seeing a BW) and that the lid was primarily cosmetic, they looked it up, confirmed, documented it, and then proceeded forward with the transmission diagnostic and ultimate replacement.

Obviously, once you start messing with the pulley size, etc. the level of burden will greatly increase. But at the end of the day, they still have to prove that the mod was the source/contributing factor of the failure, if one were to occur. Mag/Moss act is pretty clear with that.

 

[hawk02]

I think everyone has this misconception that for any modification GM has to be prove that it caused the failure to deny warranty. The keyword here is “Modification”. You install a Fram oil filter instead of an AC Delco and the oil pump goes out, then yes, GM has to prove that the Fram oil filter did not meet their specifications for oil filters before they can deny warranty coverage. When you install a catch can, however, you are modifying and changing the original design of the PCV system. GM doesn’t have to prove anything because the engine is no longer operating in accordance with how it was originally designed.

 

[PrimeTime]

On the subject of warranty coverage, if I ask for the replaced parts from my car under warranty from the dealer should I get them? Can I get them?

 

[PrimeTime]

Basic parts. Get what I'm asking? engine, no deals...

 

[Exia]

Unfortunately its a Caddy, it has a lot of sound deadening. Which sucks because I think a big reason we buy these cars is the V8 but GM goes and adds a bunch of deadening to mute it.

The LT4 has always had very little whine, with some simple fixes like the lid, but its also a Caddy and has more sound deadening then the Chevys that usually have the LT4.

 

[coffee_time]

I think everyone has this misconception that for any modification GM has to be prove that it caused the failure to deny warranty. The keyword here is “Modification”. You install a Fram oil filter instead of an AC Delco and the oil pump goes out, then yes, GM has to prove that the Fram oil filter did not meet their specifications for oil filters before they can deny warranty coverage. When you install a catch can, however, you are modifying and changing the original design of the PCV system. GM doesn’t have to prove anything because the engine is no longer operating in accordance with how it was originally designed.

While all of this is 100% true, they can still hassle the hell out of your and refuse to work on your car during this entire process. You can be “correct” and “fucked” at the same time.

 

[CBH]

Good luck on your whine venture.

I love the pipes, but I that's the only part I enjoy. Whine just gets in its way.........

I have custom mufflers, but can't wait to get the Kooks. It may be another year or two - letting that warranty elapse, but I'm getting them.

A kid used to have a 5th gen Camaro that was insanely loud. I live 3 doors from a golf course, and he played there often. I could hear it inside my house every time he fired it up. It was awesome.

I even told him about it once so he could tell complainers that somebody was legitimately a fan.

 

[+ManifoldPSI]

Thanks for starting this thread. I am hoping that my incoming 5VBW will satisfy my long-standing itch for forced induction of the other variety (Evo X, STi, 1st gen 12V with HE351 and others help quench my turbo needs), but I imagine, and it sounds like, the OEM LT4 blower setup in this car will be on the quieter side, which makes sense considering the target market overall of Cadillac.

I'll have to look into the aforementioned lids, but tempting fate and future luck with warranty coverage is certainly of mind (I did not even know about the plug debacle on the '25s until I joined this forum). You never know what mechanical surprises may be awaiting you, and with a car this expensive and designed for hard use, I'm going to have to give it serious thought.

However, after having wanted a Whipple'd Terminator for nearly half my life, and driving two stock 6spd Hellcats late last year, I can't help but think I will be incredibly tempted by anything that accentuates that fantastic albeit subdues blower whine.

I'd be interested to see what effect porting the blower has on blower whine, and if it is enough to warrant the work/cost involved.

Background: Sold my Durango Hellcat and bought a CT5-V Blackwing back in December. My favorite car I’ve ever driven with ONE problem… not enough whine. My favorite cars have always been hellcats purely because of the sound, and I miss the loud whine my Durango had (with a JLT intake).

After tons of research I finally pulled trigger on a DSX lid and did the install today. Attached are before and after videos with the hood open and some revs in neutral while coasting in sport mode. I do have custom magnaflow mufflers as well.

From the outside the whine is about twice as loud, but I still can barely hear anything from the inside. I do hear it slightly at higher RPMs. The exhaust is definitely partly to blame.

Looks like porting the supercharger + pulley is next. Didn’t want to get void my warranty but that’s how much I want the supercharger sound… The search for the louder whine continues!

 

[5VBW Nick]

My thought is that if you swap the lid for something louder and then you do have some unrelated mechanical issue that requires warranty, you can swap back to the factory lid and probably a half an hour.

 

[quikag]

grok:

The Dodge Hellcat and the Chevrolet LT4 are both iconic supercharged V8 engines, but their supercharger designs differ significantly due to engineering choices tailored to each brand's performance goals. Here's a breakdown of the key supercharger differences between the two:
Dodge Hellcat Supercharger

• Engine: 6.2L HEMI V8
• Supercharger Type: Twin-screw, positive displacement
• Displacement:
  • Standard Hellcat: 2.4 liters (2,380 cc)
  • Hellcat Redeye, Jailbreak, Super Stock: 2.7 liters (2,700 cc)
• Boost Pressure:
  • Standard Hellcat: 11.6 psi
  • Redeye and variants: Up to 14.5 psi
• Manufacturer: IHI (a Japanese company, with production in the U.S. for Hellcat applications)
• Design Features:
  • Twin-screw design compresses air directly between two interlocking rotors, providing instant throttle response and a distinctive whine.
  • Sealed-for-life lubrication system with synthetic oil for durability.
  • Integrated with dual air-to-liquid intercoolers to manage heat, maintaining intake air temps below 140°F under extreme conditions.
• Power Output:
  • Standard Hellcat: 707-717 hp
  • Redeye: 797 hp
  • Jailbreak/Super Stock: 807 hp (up to 1,025 hp in the Demon 170 with E85 fuel, though that’s a unique variant)
• Purpose: Emphasizes raw, brute power and instant torque delivery, aligning with Dodge’s muscle car heritage.

Chevrolet LT4 Supercharger

• Engine: 6.2L V8 (small-block Gen V)
• Supercharger Type: Roots-type, positive displacement
• Displacement: 1.7 liters (1,740 cc)
• Boost Pressure: Approximately 9-10 psi (varies slightly by application, e.g., Camaro ZL1 vs. Corvette Z06)
• Manufacturer: Eaton
• Design Features:
  • Roots-style design moves air into the intake manifold, where it’s compressed, resulting in a less aggressive whine compared to a twin-screw but still effective power delivery.
  • Smaller displacement than the Hellcat’s supercharger, paired with a higher-revving engine design.
  • Features a four-lobe rotor design with a 160-degree twist for improved efficiency and reduced noise over earlier Roots blowers.
  • Integrated intercoolers (air-to-liquid) to cool the compressed air, though the smaller size means less air volume per revolution compared to the Hellcat.
• Power Output:
  • Camaro ZL1: 650 hp
  • Corvette Z06: 650 hp
  • Cadillac CTS-V: 640 hp
• Purpose: Balances power with refinement, designed for track-capable performance cars with a focus on handling as well as straight-line speed.

Key Differences

1. Supercharger Type:
   • Hellcat: Twin-screw (compresses air internally between rotors).
   • LT4: Roots (moves air into the manifold for compression).
   • Impact: Twin-screw offers better efficiency and immediate boost, while Roots is simpler and quieter but less efficient per revolution.
2. Size/Displacement:
   • Hellcat: 2.4L or 2.7L (larger capacity for more air volume).
   • LT4: 1.7L (smaller, relying on engine tuning and higher RPMs for power).
   • Impact: The Hellcat’s larger supercharger moves more air, contributing to higher peak horsepower, while the LT4’s smaller unit suits a lighter, more agile vehicle design.
3. Boost Levels:
   • Hellcat: Higher boost (11.6-14.5 psi) for maximum power.
   • LT4: Lower boost (9-10 psi) for a balance of power and engine longevity.
   • Impact: Hellcat prioritizes outright power; LT4 aims for a broader performance envelope.
4. Sound:
   • Hellcat: Louder, more pronounced supercharger whine due to twin-screw design and larger size.
   • LT4: Subtler whine, with more engine roar audible, thanks to the smaller Roots blower.
   • Impact: A matter of preference—Hellcat’s sound is part of its muscle car persona; LT4’s is more subdued for a refined edge.
5. Application Philosophy:
   • Hellcat: Built for drag-strip dominance and muscle car excess (e.g., Challenger, Charger).
   • LT4: Engineered for all-around performance, including track handling (e.g., Camaro ZL1, Corvette Z06).
   • Impact: The Hellcat’s supercharger supports its “more is more” ethos, while the LT4’s complements a lighter, more balanced chassis.

Summary
The Hellcat’s supercharger is a larger, twin-screw unit designed to deliver massive, immediate power with a focus on straight-line performance and an aggressive presence. The LT4’s smaller Roots-type supercharger, while still potent, supports a more versatile performance profile, prioritizing efficiency and track capability over sheer output. Dodge went big and bold; Chevy opted for a compact, refined approach—each reflecting their brand’s identity.

 

[quikag]

Reason for my grok post is to state the obvious that it will likely take a twin screw blower to REALLY make it sound like a Hellcat. I had a '23 TRX for a while and the Hellcat engine is bada**. The LT4 is great too, but it's just plain quieter on the intake/blower side and that's by design.

I like how my 5BW sounds overall, though it is a bit quiet for me, but fits with the executive sports sedan vibe. It is definitely louder outside than inside the car.

 

[Yo Nadz]

My thought is that if you swap the lid for something louder and then you do have some unrelated mechanical issue that requires warranty, you can swap back to the factory lid and probably a half an hour.

This. ^

I did a DSX lid. Mostly because I wanted to dress up the engine bay a little. Outside the car there is a more noticeable increase in sound than inside. It’s definitely louder inside than stock, but it’s not by much. Just a hint of whine so you know it’s there. And by no means is it hellcat loud. Those things scream.

Here’s my before/after video.

 

[5VBW Nick]

This. ^

I did a DSX lid. Mostly because I wanted to dress up the engine bay a little. Outside the car there is a more noticeable increase in sound than inside. It’s definitely louder inside than stock, but it’s not by much. Just a hint of whine so you know it’s there. And by no means is it hellcat loud. Those things scream.

Here’s my before/after video.

How long does install take?