vvel vs conventional intake camshaft?

chendaxian888 · 11-28-2022, 02:01 PM

Quote:

Originally Posted by THE BULL

In one end the DE 35 did get better by the last iteration which was the HR

This idea already exists in a form of HR hybrids.

These utilize a VHR block paired with the double VTC 35 HR heads.

By going with higher lift cams you essentially obtain some characteristics of lift the rest is playing with duration and overlap electronically

Reason why VVEL did not come in other vehicles is because of trims and turbos.

Nissan/Infiniti moved to turbos and in many example of production vehicles you'll see a lack of variable lift. Boost helps compensate for the lift. What you end up seeing mostly is cam timing.

These HR hybrids do well however mostly on cams and ethanol.

so you think that vvel can do better after a exhaust cam and e85?

gbrettin · 11-28-2022, 09:05 PM

Quote:

Originally Posted by chendaxian888

so you think that vvel can do better after a exhaust cam and e85?

Jim Wolf Tech seems to think so:
These Jim Wolf Technology exhaust camshafts for your VQ37VHR offer a 271 Degree Duration with 0.461" of Max Lift. Jim Wolf Technology has produced these exhaust camshafts to increase mid-range torque as well as top end horsepower. With supporting mods, these camshafts can add as much as 30lb-ft around 3000rpm with an additional 10hp at 7500rpm. Due to their well designed VVEL system, the intake camshaft is not necessary to upgrade.

https://ma-motorsports.com/collectio...37vhr-370z-g37

Might as well do the intake valve while you are in there:

https://sohomotorsports.com/blogs/in...ize-vhr-valves

Also, you will need machine work on the VHR head, while you're in there... might as well pull the engine and put turbos on...

THE BULL · 12-01-2022, 11:31 AM

Quote:

Originally Posted by chendaxian888

so you think that vvel can do better after a exhaust cam and e85?

VVEL is truly the ultimate in variable lift. It's truly the second benefit of the VHR, block being the first.

Lets say a standard 330whp on bolt ons you could squeeze another 20whp on these two, even more depending on your tuning and additional parts

The comparison is a tough one.

VHR- In one end you have wide ranging variable lifting cam and one fixed which can only be replaced with higher ones.

On the HR you only have standard practices at increasing lift but you gain full control of cam timing advancing and retarding.

The VVEL system is great however there will be a point where you will reach max power for lift even though the cam can go farther it wont make any more power due to duration. The duration on the VHR controls both cams per bank equally unlike the HR which would be separate.

We see in racing that lift increases valve opening height however you can only do this so far until it's time to close. Duration keeps that valve open longer and helps jams more air in the cylinder as well as give control of variable overlap which means keeping both valves open for a period so the incoming charged air can push the exhaust gasses out of the cylinder for when it's time to combust.

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