Cold Air Intake HP Debate - Is it worth it ?

jnaut

Actually that 2.0 sr20ve is a good motor, I just did a swap at my sbhop into a 99 sentre se.

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Best 1/4 mile 12.24 Best mph 114.5_______

BalanBro

Did Nissan buy the rights for the variable lift from Honda? I was studying these motors a few years back, and it was a blatant copy of VTEC.

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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z

henry0844

both of those motors had vvel like our z. vvel is much more technically advanced than vtech. vvel has no intake cam and is computer controlled.

BalanBro

No, I'm pretty sure those had "Neo VVL". It didn't have fully variable control of the intake valve. Instead it had an adjacent "aggressive" cam lobe which used oil pressre to engage the aggresive cam follower at a set RPM. Just like Honda's system. Still not sure how they got around the patents.

VVEL didn't come along til much later.

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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z

jnaut

neo vvl , exactly!

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Best 1/4 mile 12.24 Best mph 114.5_______

wstar

The G3-vs-dropin thing is mostly arguing about pointless tiny effects. Getting a valid dyno comparison on a 10hp or less difference on this engine is bound to run into accuracy and repeatability issues. I bet I can go to the same dyno shop two days in a row without changing a thing on my car and get at *least* a 5hp difference, especially if the dyno's not maintained and operated perfectly, or there's any slight change in the weather, or more traffic on the way to the shop, etc.

Perhaps more importantly with intake mods: the dyno doesn't accurately reflect real driving conditions. On a dyno you're measuring how effective your intake is when the car's pulling through the 100mph+ range, with only a 20mph headwind coming in from a fan (with probably lower CFM than the car would get even rolling at 20mph), too much heat building up everywhere, totally different airflow effects happening all over, etc. Could be a completely different story when you're actually at 100mph, with a 100mph wind coming in the front of the car (and everywhere else), different airflow patterns, etc.

Also:

Our engines do, in fact, have intake cams. VVEL just uses a crazy system of eccentric orbiting stuff to dynamically alter the lift/duration by moving the intake cam as it's spinning, so to speak.

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7AT Track Car!
Journal thread / Car setup details

ZBro16

Went through this thread and tried so hard to figure out how we went from "the power difference made from SRI to CAI on the 370Z" to "VTEC BRO" and couldn't draw a single line between the two.