Nissan 370Z Forum - Stillen G3's those who own with real results please Chime in

Nissan 370Z Forum (http://www.the370z.com/)

- Intake/Exhaust (http://www.the370z.com/intake-exhaust/)

- - Stillen G3's those who own with real results please Chime in (http://www.the370z.com/intake-exhaust/25446-stillen-g3s-those-who-own-real-results-please-chime.html)

Quote:

Originally Posted by 370Zsteve (Post 736920)

IMHO, the metal of the CAI gets extremely hot in a closed engine bay. Removing the front fascia allows much more air into the engine bay, possibly cooling the pipes to release more HP. Another angle to consider.

I actually touched my tubes after a few drag passes immediately after opening the engine bay and they were ICE COLD, i dont think thats an issue.

Quote:

Originally Posted by 370Zsteve (Post 736915)

No question about it. Never, I repeat, NEVER believe a vendor's claim of added HP. Subtract about 50% for a more realistic gain.

LOL

Check my comment above...I said half and if I got 10 out of their 17.5 I'd be delighted.

NOW, for some of you who have heard or are saying the G3s are actually not as good as the stock box or have no measurable difference...some stats on today's trip.

I installed Friday and drove about 70 miles to the Z Nationals around noon today. I zeroed the MPH/MPG when I hit the interstate. About 65 miles later, I registered an average speed of 64.4 and a MPG of 30.5! We all know a CAI improves gas mileage. I've never pulled much over 27/28 before. Never in the 30s.

So what does this mean? It means the G3s are doing SOMETHING better than the stock airboxes. Maybe it's not a huge noticeable power increase (I THINK I notice a difference/increase but I'm allowing for it just being my wishful thinking). But the increase in MPG means the G3s are getting better air inside the engine and it's running more efficiently and if it's doing that, then it's making more HP.

And it was around 90 when I made that trip.

Another trip I routinely measure is from home to work. I'll see how that one turns out next time I drive to work.

PS: I didn't get this thing for increased MPG. It's a side benefit. I'm just using the numbers as proof something good is happening.

Quote:

Originally Posted by Red370 (Post 736929)

I actually touched my tubes after a few drag passes immediately after opening the engine bay and they were ICE COLD, i dont think thats an issue.

You G3 tubes were ice cold? lmao. Then the engine was too.

Quote:

Originally Posted by Slynky (Post 736953)

If you are getting better gas mileage, then your intakes are making less power. There is no free lunch. More power = more fuel consumption.

Quote:

Originally Posted by 370Zsteve (Post 736956)

You G3 tubes were ice cold? lmao. Then the engine was too.

lol I touched my intakes after a whole day of racing on francorchamps they were quite cool even though my engine was pretty much overheated.

and more mileage means less power?

if the engine can burn its fuel more effectively than stock and the ECU adapts then I don't see why its impossible.

hell I know plenty of people who chiptuned their car and got more power while drinking less fuel.

Quote:

Originally Posted by Vegitto-kun (Post 736962)

I didn't say more mileage = less power. I said more power = higher fuel consumption. You guys can talk about "efficiency" all you want to. There is no free lunch.

Quote:

Originally Posted by 370Zsteve (Post 736966)

I didn't say more mileage = less power. I said more power = higher fuel consumption. You guys can talk about "efficiency" all you want to. There is no free lunch.

As most bolt ons go they lean you out so you get better mileage, that doesn't mean they dont make more power than stock setup, it just means they could be making even more with a proper AFR.

Quote:

Originally Posted by 370Zsteve (Post 736958)

If you are getting better gas mileage, then your intakes are making less power. There is no free lunch. More power = more fuel consumption.

As much of an authority as you seem to be, I thought it was pretty much accepted that CAIs increased power and economy. You'll pardon me if I side with Wiki over you...

Cold air intake - Wikipedia, the free encyclopedia

Quote:

A cold air intake is a device used to bring lower temperature air into a car's internal-combustion engine, to increase engine power and efficiency.

Standard air intake systems tend to be very restrictive sacrificing engine power or efficiency in order to eliminate engine noise. Aftermarket cold air intake systems come in many different colors and sizes, and are easy to install when compared with other performance-increasing modifications. All cold air intakes operate on the principle of increasing the amount of oxygen available for combustion with fuel. Because cooler air has a higher density (greater mass per unit volume), cold air intakes generally work by introducing cooler air from outside the hot engine bay. However, the term "cold air intake" is often used incorrectly to describe an air filter system with an exposed filter in the engine bay, which actually increases the temperature of the air entering an engine.

Some strategies used in designing cold-air intakes are:

Increasing the diameter of the air intake, reducing airflow velocity and pumping losses.
Smoothing the interior of the intake to reduce air resistance.
Providing a more direct route to the air intake by eliminating muffling devices.
Shortening the length of the intake.
Using a less restrictive air filter, usually trading filtering quality for increased airflow capacity.
Contents [hide]
1 Advantages
2 Disadvantages
3 Application
4 See also

[edit] Advantages
Other advantages to having a cold air intake installed include:

Increased horsepower and torque
Improved throttle response and fuel economy in most cases

[edit] Disadvantages
Hydrolock - The intake opening is lower to the ground than a standard air box, and more likely to introduce water into the engine when fording streams or flooded roads. Hydrolock generally does not occur unless the filter is fully submerged in water."Bypass filters" can be purchased which prevent most water from entering the engine. Some people use hydro shields to prevent this from occurring, however hydro shields are not completely water proof if the intake tube is completely submerged in water.
Noise - Stock air filtration systems usually include resonator-based muffling tubes. Removing them reduces pumping losses but increases noise.
Can void the engine warranty - Many auto manufacturers are denying warranty repairs of vehicles that have aftermarket engine modifications.
[edit] Application
Intake systems come in many different styles and can be constructed from plastic, metal, rubber (silicone) or composite materials (fiberglass, carbon fiber or Kevlar). The most efficient intake systems utilize an airbox which is sized to complement the engine and will extend the powerband of the engine. The intake snorkel (opening for the intake air to enter the system) must be large enough to ensure sufficient air is available to the engine under all conditions from idle to full throttle.

The most basic cold air intake replaces the stock airbox with a short metal or plastic tube leading to a conical air filter, called a short ram air intake. The power gained by this method can vary depending on how restrictive the factory airbox is. The placement of the filter is usually directly in the engine compartment, those without a shroud to prevent engine bay heat ingestion are known as a "hot air intake". The overall benefits depend on the specific application. Power may be lost at certain engine speeds, and gained at others. Because of the increased airflow and reduced covering, intake noise is usually increased. This effect is usually amplified on applications where a resonator, a part intended to reduce intake noise on some vehicles, is replaced by the intake.

Well-designed intakes use heat shields to isolate the air filter from the rest of the engine compartment, providing cooler air from the front or side of the engine bay. Some systems called "fender mount" move the filter into the fender wall, this system draws air up through the fender wall which provides even more isolation and still cooler air.

Air bypass valves are gaining popularity in cold air intake manufacturing. An air bypass valve is a filtered spacer that is positioned more into the engine bay, between two connected pieces of the cold air intake assembly. This prevents hydro-locking by providing an alternate route for air to come in, thus eliminating the vacuum that causes water to be sucked in from a puddle. Foam filters are a simple piece of foam that is air permeable, and most have no valve. It is argued that this reduces power, but in actuality it provides more surface area for air to enter the engine when the driver accelerates. When driving at moderate speeds, the suction caused by the engine is not enough to activate the air bypass valve. Cloth filter bypass valves only allow air in if the valve is sucked open as result of the vacuum pressure caused by a blocked filter at the bottom of the intake.

Quote:

Originally Posted by 370Zsteve (Post 736956)

You G3 tubes were ice cold? lmao. Then the engine was too.

see, the purpose of a cold air intake is to pull in cold air... being that I just made a drag pass, the engine is required to take in quite a bit of air, being that the air was cold, it then in turn made the metal surrounding it cool, its a pretty neat concept. I've touched them after doing a bit of city driving as well and found them to be cool, apparently THEY ACTUALLY WORK.

Wow 370ZSteve...was looking at your signature and it seems that based on your comments you're dissatisfied with the G3's which is listed as one of your parts...Did you really get a decrease in power from them?

now I have a 370z, but before I have 350z and y buy kN thyphonn, JWT pop charger and gruppe-m, was bad for my money, now I'll leave the 370Z intake oem, better to spend that money on Final drive gear Set 4.083, that is a good modification.

This is my opinion, my experience over 5 years 350z.

Quote:

Originally Posted by Slynky (Post 737097)

The OEM intakes are cold air intakes.

Quote:

Originally Posted by BOLIO 671 (Post 737429)

+6 HP from CAI as my 2nd mod. I love my G3's. Whe I touch them after driving, they are hot as hell. There is a reason Cobb made intake tubes out of non-metallic materials.

Guys, guys, please don't post Wikipedia links to support your opinions. Anyone can post, or edit, a Wiki page. Not exactly authoritative.......

Quote:

Originally Posted by 370Zsteve (Post 737526)

The OEM intakes are cold air intakes.

I never said they weren't cold air intakes. All I said (and what you disagreed with) was that the G3s seem to do the job better and I used increased MPG as part of the proof (in absence of a before and after dyno). You disagreed by saying, "more power = higher fuel consumption". THAT statement was all I was disagreeing with by posting the Wiki article which indicates one gets more POWER AND better FUEL ECONOMY. I never argued the OEM wasn't a cold air intake.

Most eveyr aftermarket CAI maker boasts increased MPG and POWER. The Wiki article says the same thing. But you say it isn't so. There's no free ride, etc. I disagree with you and a lot of other reading material disagrees with you, too.