and yes Frank, my 'they do' was directed to your explanation as to why every kid on the block has a CAI. I witness this on a weekly basis when my son's friends turn our driveway into a scene from The Fast and The Furious. (of course Dad has a CAI on his car too!)

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Phil
1981 280zxt - Now in the care my son!
2014 370Z Sports Touring Roadster

Phil is a cool Dad.

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Mike Tubiak
1978 Datsun 280Z - HLS30-438694

Phil is just cool, period.

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1970 240Z

well of course.

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Mike Tubiak
1978 Datsun 280Z - HLS30-438694

Edit* bah.

A CAI such as that K&N *can* free up a sizable chunk of hp, but most of the time the numbers do seem to be high on the advertising end. You would be surprised though, I've seen some tests. Nothing like a gain of 45hp though, as far as I know. You also have to take into account any drivetrain upgrades etc, but more importantly the original HP is measured at an engine's point of peak performance. As the motor breaks in, it becomes more powerful as clearances loosen up. After this peak, deposits and wear begin the engine's steady decline in power output.

Another thing to consider is WHERE this gain of power is. Depending on the design of the intake, power can actually be DECREASED in certain areas and increased higher up in the power band, or vice versa. Its not always just a flat +5-10hp gain across the RPM range.

Frank, was that 350z NA or forced induction? You can spend MANY times more funds making power on a naturally aspirated motor than you would on a forced induction motor, just to make minuscule gains. Believe it or not, but building power on a turbo motor is a lot less expensive.

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-Chris

Love it!

Al

about time you got here.

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Mike Tubiak
1978 Datsun 280Z - HLS30-438694

Even though they don't make a CAI for my car, I'm enjoying the short ram I put in my engine bay. Car makes better noises now when revved, and I've noticed that my mileage has improved.

Each tank appears to be between 2 and even 5mpg better than it used to average, depending on the driving I've done. That might not sound like a lot, but when you're putting on more than 30,000 miles each year, it adds up, and I'm pretty sure I'll have paid for the intake via savings by summer's end.

Oooops! Sorry Al!
Corrected, with apologies!

Frank

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1970 240Z

no need to apologize we are all hear to learn Frank.

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Mike Tubiak
1978 Datsun 280Z - HLS30-438694

Phrog, the 350 I liked was N/A, but had lots of goodies done to the engine. You're right ~ there were some forced air cars there too, which were cranking out some very scary numbers (like 450 at the wheels, etc).

But nobody's gonna get 300hp from his engine simply by installing a cold air intake system, unless he was already within spittin' distance of it in the first place.

Frank

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1970 240Z

Ha. Speaking of forced induction...

Just my .002 cents.

Most CAI are at best a placebo on a stock or near stock vehicle, and at worst can cause issues. The gains usually seen on MAF based vehicles have little do to with increasing flow, and more with tricking the ECU into leaning out conditions. Not saying that it isn't worth it down the line, but I think it is rarer to find a motor that requires a CAI off the bat then people think. Also keep in mind filter placement. Most if not all "shorty" CAI's have the filter smack dab in the middle of the engine bay drawing in nice warm air. Unless it is a true longtube it will most likely just raise IAT's.

The drop in filters are *maybe* worth a horse or two, but I have yet to see honest dyno results that prove it as more then a statistical anomaly. They are substantially better at filtering, and the ability to clean and reuse is worth the cost of admission.

FWIW

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"We hang the petty thieves and appoint the great ones to public office." -Aesop

Okay, same topic; hope I'm not digressing too much.
But here's an opportunity to help me with a practical applicat

I bought one of the first Cummins Dodges in 1989. At that time
the 5-speed manual and 4-speed overdrive A/T were withdrawn
from availability because the torque of the engine was too much
for those transmissions. So the only available xmsn was the 727
A/T, the one that had been used behind the BIG Hemi engines in
the past. Despite no overdrive, I got as high as 23 MPG on a trip
to Charlotte NC while driving HARD and with the A/C going. But
locally, about 18 MPG was more the norm.

Fast forward: when we began receiving invitations (and demands)
to bring Lucky 13 to various Z Car shows and events, some at a
considerable distance, we refinanced the mortgage to buy a 2009
Cummins and an enclosed trailer. The truck is a 2009 Dodge 2500,
HD, 6-speed manual, Cummins turbo Diesel engine, 4x4, 3.42 axle.
NOT a duallie. With the updated technology of the newer Diesels,
as well as improved aerodynamics and an overdrive xmsn, I would
have expected to get at least the same MPG from the newer truck,
when operated without a load. But when pulling 3100 pounds of
aluminum trailer containing 2300 pounds of Z Car and maybe 500
pounds of other miscellany, I'm realistic enough to realize that my
MPG would be somewhat less, even though the trailer is a double-
V-nose to lower wind resistance. I was hoping for 18-20 MPG.

I don't even come close (usually 12-13 MPG, despite driving gently
and keeping the road speed down to the posted limit), which is not
only disappointing, but also EXPENSIVE what with the price of fuel.
At the Ziebart facility, I met a guy who suggested that to install a
K&N cold air intake would increase my MPG by about 4-5 MPG.

Can anyone corroborate this observation? What else can be done
to help increase the MPG, and at what cost? Any expense would
quickly be amortized by the increased fuel economy vis-a-vis the
price per gallon of fuel nowadays. Power is not a consideration to
me since the truck doesn't even notice it is pulling the above-
mentioned load, except on the very steepest grades.

All Z Best,..........................Kathy & Rick

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All Z Best,.......Kathy & Rick

1969 Z.CAR (#00013 10/69) 8/30/76
1969 ITSA.Z (#00171 11/69) 8/24/73
1970 OLD.Z (#06289 6/70) original owner
1971 510 2dr since 12/31/75
1969 1600 rdstr (our 160-Z)
1971 (#19851 1/71) sold
1975 75.Z (#01343 1/75)

OK, this is getting better.

So now, the K&N Cold Air Intake kit adds horsepower AND increases MPG.

C'mon guyz ~ convince me!

Frank

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1970 240Z