Cold Air Intake HP Debate - Is it worth it ?

jnaut · 04-02-2011, 09:35 AM

Quote:

Originally Posted by TBOX

I'm sorry but this makes no sense to me. Are you trying to say a Honda, an American motor or a rotary are superior NA builds?

A: name a Honda motor that is superior to any other motor for making power, hondas rely on weight and high revving motors but in reality compared to any other choice are a horrible option for power.
B: point me at a rotary NA build that makes power... The wankel was and is a failure. Don't mistake the brilliance of the handling of rx7s and rx8s and their power potential.
C: you don't mean American, you mean displacement (which is the typical route for American muscle cars) which will always make more power on an NA build

honda s2000k over 100hp per liter n/a . nissan cant touch this. period

TBOX · 04-02-2011, 10:21 AM

Quote:

Originally Posted by jnaut

honda s2000k over 100hp per liter n/a . nissan cant touch this. period

Yes hp/liter s2000 and even them rotary potaoes are some of the top contenders, but I wouldnt consider them the top NA cars. No matter, we're derailing.

BLM · 04-03-2011, 07:08 AM

Quote:

Originally Posted by jnaut

honda s2000k over 100hp per liter n/a . nissan cant touch this. period

Actually, with an exhaust swap and a tune you'd be pretty close to 370 bhp and though the 120 HP/liter is impressive on the s2k you sacrifice a lot in terms of low-mid range power with a high revving motor like that.

Jordo! · 04-03-2011, 01:13 PM

Quote:

Originally Posted by BLM

Actually, with an exhaust swap and a tune you'd be pretty close to 370 bhp and though the 120 HP/liter is impressive on the s2k you sacrifice a lot in terms of low-mid range power with a high revving motor like that.

Yep. A fully bolted on tuned Z will definitely be there at the crank, espcially if we use ps units, which are a few % higher than hp units.

VVEL tuning, I predict, will be the key to really getting a NA motor to wake up tho'.

Nissanboy · 04-05-2011, 01:50 AM

Quote:

Originally Posted by jnaut

honda s2000k over 100hp per liter n/a . nissan cant touch this. period

Its still slow

henry0844 · 04-05-2011, 05:24 AM

lol

jnaut · 04-05-2011, 08:22 AM

Quote:

Originally Posted by Nissanboy

Its still slow

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

BalanBro · 04-05-2011, 10:53 AM

Quote:

Originally Posted by jnaut

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

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.

henry0844 · 04-05-2011, 02:43 PM

Quote:

Originally Posted by 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.

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 · 04-05-2011, 07:32 PM

Quote:

Originally Posted by 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.

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.

jnaut · 04-06-2011, 05:11 PM

Quote:

Originally Posted by 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.

neo vvl , exactly!

wstar · 09-14-2012, 07:28 PM

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:

Quote:

Originally Posted by henry0844

vvel has no intake cam and is computer controlled.

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.

ZBro16 · 09-17-2012, 03:54 PM

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.

Red__Zed · 04-05-2011, 10:57 AM

Quote:

Originally Posted by Nissanboy

Its still slow

With a decent driver, they will leave a Z around most tight road courses.

Limeybastard · 10-23-2014, 11:11 PM

Quote:

Originally Posted by jnaut

honda s2000k over 100hp per liter n/a . nissan cant touch this. period

Me old 1997 BMW M3 with the euro S50B32 engine delivered over 100hp per litre also. It was a 3.2 litre unit.

09-17-2012, 03:54 PM	#13 (permalink)
ZBro16 Enthusiast Member Join Date: Nov 2011 Location: Huntsville, AL Posts: 370 Drives: A Z. Rep Power: 14	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. gtabaz and ufoz8mycow like this.

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