VCT Lock Exhaust Note

[gdillon556]

So when you go to buy new cams, many will require a VCT lockout in order to clear the valves from the pistons. This also what the ghost cam tune does. It locks the cams to give it a chop. I am curious if anybody has locked the VCT
and noticed a different sound through the rev range. I personally don’t like the sound of the newer mustangs and I was wondering if locking the VCT would improve the sound. If anybody has any videos please post them. Thanks.

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[armykyle1 [HACKED ACCOUNT]

So when you go to buy new cams, many will require a VCT lockout in order to clear the valves from the pistons. This also what the ghost cam tune does. It locks the cams to give it a chop. I am curious if anybody has locked the VCT
and noticed a different sound through the rev range. I personally don’t like the sound of the newer mustangs and I was wondering if locking the VCT would improve the sound. If anybody has any videos please post them. Thanks.

I don't know of anyone besides full on race car builds that have locked the cams. Even with aftermarket cams, there's no need to put phaser locks on or remove the vct. The purpose of the VCT to help have the best of both worlds, good low end response and high RPM HP.

 

[Saywhen]

Armykyle nailed it

 

[gdillon556]

I don't know of anyone besides full on race car builds that have locked the cams. Even with aftermarket cams, there's no need to put phaser locks on or remove the vct. The purpose of the VCT to help have the best of both worlds, good low end response and high RPM HP.

If you look at say L&M’s higher stage cams you’ll see that it says they require the locking of the cams. If you go to this link, and look at the description, on the second line you will see it requires the locking of them. I might be wrong but I think some of Comp’s stuff does too.

https://www.lmengines.com/products/...-2015/l-m-sr15-5-0l-coyote-camshaft-2015.html

 

[jasonstang]

I don't think the sound is cause by the cam but more due to the number of valves as well as firing order.
I have two Ducatis one is two valve and one is four, they both don't have VCT and they sound totally different.

 

[Saywhen]

Yup gotta love those duc's. I have a monster 1200. It sounds great but I wish it had a dry clutch...

 

[gearhead2685]

http://www.fordnxt.com/news/how-much-power-does-coyote-vct-account-for-aem-answers-the-question/

The testing conducted by AEM proves how vital the VCT system is. With no VCT, the Coyote engine peaks out at 6,500 RPM making 423.1 hp. With the intake only VCT, the engine only picks up 5.8 peak horsepower jumping to 428.9 hp at the same 6,500 RPM. With the exhaust VCT also activated, the engine puts out 465.4 hp at 6,500 RPM. This is where carefully studying the dyno information is valuable. A total gain at peak RPM of 42.3 hp might not sound like its worth the trouble of the VCT, but closer inspection shows a much bigger story. At 3,900 RPM the engine is making 109.3 hp more with the VCT activated than it was without.

The story is very similar, and perhaps even more dramatic in terms of torque. With no VCT the engine made 368.6 lb-ft at 5,400 RPM. With the intake VCT active, that torque jumps to a peak of 412.2 lb-ft, and the peak drops down to 4,400 RPM, torque stays above 400 lb-ft until nearly 5,400 RPM. Activating the VCT on the exhaust cam shows another substantial spike in peak torque output, taking total peak torque to 454.4 lb-ft at 4,400 RPM. That’s a gain of 85.8 lb-ft, at peak.

Once again with torque, the graph proves out how valuable the VCT is for torque as well. Take a look at the torque graph at 3,700 RPM. At that point we can see that with VCT, the Coyote engine is making another 149.9 lb-ft than without. Even at the horsepower peak of 6,500 RPM, torque with VCT active is still outrunning torque with it deactivated, with the engine making over 375 lb-ft at 6,500 RPM. The non VCT setup never outmatches the VCT activated setup for torque or horsepower, especially below peak where it matters the most.

Locking out cams on the 2015 plus engines seems insane to me! why take away the technology that makes this engine great!

"big" lopey cams are a thing of the past when you can manipulate the cams throughout the rpm range.

I havnt compared specs of those new L&M cams vs say the Comp Cams Stage 3 NA cams.

Either way not a chance in hell id run locked out cams.

Look at Evil 5.0s results making over 500whp NA!

These would have to make more NA hp than those to even remotely consider locking out cams on this engine IMO.

 

[gearhead2685]

2015 + Comp Cams CR Stage 3 NA


Advertised Duration - IN 271, EX 285

Duration @ .050" - IN 235, EX 237

Valve Lift - IN .516", EX .514"

Lobe Sep - 131



L&M LM1 Cams

Specifications

- Proprietary grind: 0.513” Max Lift, [email protected]" Duration Intake; 0.513”, [email protected]" Duration Exhaust


For reference.

Edit L&M doesnt show Lobe Sep.

 

[Saywhen]

[MENTION=30439]gearhead2685[/MENTION] also nailed it!!! He knows his stuff [MENTION=30439]gearhead2685[/MENTION] FTW!!!

 

[Saywhen]

The VCT is how Lund gets all the power from these cammed builds...

 

[gearhead2685]

Not a chance in hell id lock these cams Pfft thats for pre 2015 nonsense lol.......

The 2015 gen2 engines are different and can get away WITHOUT locking some cams the 2014s and older would be required to use limiters or locks.

Until someone shows me massive gains with locked cams on a 2015 up i just dont see it happening.

Even then id question the tuner why they locked them in the first place instead of just manipulating the VCT "sweep" to run the so called "bigger" cams and stay with in the window (vct window as in full retard to full advance cam sweep) as to not have any interference.

VCT is crucial to making power on a small cube engine period.

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