Intake question

Hey wuts up, I was looking around the forum for info on the best intake for a G20 but i really couldnt find much. I was wondering if anyone would know wut the best type of intake would be for a 2002 G20.
Thanx

JWT POP charger ;) I think the going price is $130 shipped? Call Ben @ JWT 619-442-0680.

If he says its $150, tell him you heard from a little bird that its $130 shipped! :angel:

If you're looking for a cold air intake I'd suggest HotShot. :) It's what I use.


BTW, where abouts in NJ? I'm from Kearny.

Yea i was looking at the HS site but it said i needed a smaller battery.


Yea ur close 2 me i live in Nutley

Which one do u think would work better, is there a major difference between the two?

You dont really need a smaller battery, it depends on where you cut through your engine bay. I have my stock battery, but there where a few 'issues'.


A CAI will get you about 7 or 8 HP @ the wheels. A pop charger will get you about 4 HP @ the wheels.



With the CAI you run a chance of sucking up water through your intake. I have an AEM by pass valve on it, but there's always the risk. Small puddles are nothing to worry about, but if you ever hit a flooded street you're in big trouble.

You should go to the HS,but you will need batery

My car.. HS CAI, stock battery.

I would go with the AEM CAI, it has been proven better for both BHP and torque both (8-12 and 12-15 respectivly).

AEM does not make a CAI for 2000+ models (or any P11 for that matter) ;)


Brand name does not matter either, any brand will produce around the same HP. The gains in CAI's are mainly due to the length of the tube and the air picking up speed as it funnels in. The cold air helps but not as much as the length of the tube.



I think when they first developed the idea they mis-named it because they were under the wrong impression. They should've been called: "Long air intakes"

So does that mean that those "short ram" cai dont do shit?

They do if you can manage to get air "rammed" in.


The increase in airflow is what gains HP/torque... thats the concept in turbos. Cooler air is a plus, but flow rate is the winner.

Originally posted by b-b00gie
They do if you can manage to get air "rammed" in.


The increase in airflow is what gains HP/torque... thats the concept in turbos. Cooler air is a plus, but flow rate is the winner.

So, what do you think of this product www.turbozet.com (http://www.turbozet.com) a friend of mine has it in his primera, and he is very happy.

Heh.. Dont know what to make of that! :bloated:

Do any of you know of anyone who actually did have a problem with water going up the intake (and weren't driving through floods)?

You wont have that problem unless the filter get completely submerged (or close to it) in water. The suction from the intake is not strong enough to suck some water up off the ground when it can easily suck in air. However if the filter is submerged and there is no air available, there will be no choice but to start sucking up water.

Does the CAI filter wear much faster since it is exposed to road debris from driving? ie dirt roads and Illinois tollways. Do you have to cut into the frame in order to get this to fit? It seems the pop charge would be the way to go. But that is just my 2 cents.

Doesn't anyone use ordinary K&N filters!? :)

You can just see mine if you concentrate! :)

hey teamnissan is that a K&N if so how come tis a lot smaller then wot I have:confused:

has anyone bought a JWT pop charger for a 2002?

Originally posted by ragt20
hey teamnissan is that a K&N if so how come tis a lot smaller then wot I have:confused:

That is probably because your K&N filter is made for more HP!! My K&N is only up to 200 HP! :)

The gains in CAI's are mainly due to the length of the tube and the air picking up speed as it funnels in. The cold air helps but not as much as the length of the tube.

Yes and no......the flow rate is indeed a major factor, but I don't think anymore or less than the cold air. I can't be exactly sure of the exact significance of each yet (in terms of numbers), but if you want, I can put together a Thermodynamic Analysis to demonstrate.

Originally posted by Free Flow


Yes and no......the flow rate is indeed a major factor, but I don't think anymore or less than the cold air. I can't be exactly sure of the exact significance of each yet (in terms of numbers), but if you want, I can put together a Thermodynamic Analysis to demonstrate.

No need.

Theres been numerous tests by qualified individuals and car magazines.


The increased torque and horsepower in CAI's is mainly due to the length, not the cold air. The difference in air temp is barely a difference.

Originally posted by Free Flow
Yes and no......the flow rate is indeed a major factor, but I don't think anymore or less than the cold air. I can't be exactly sure of the exact significance of each yet (in terms of numbers), but if you want, I can put together a Thermodynamic Analysis to demonstrate.

Don't bother.

The temperature of the air entering the filter under hood is pretty near ambient (just a few degrees). This is from data acquisition, not just speculation. It's also from multiple tests. Lew Shadoff from the SE-R Mailing List checked this as did one of the Kiwis here (sorry, I cannot remember who - I just woke up and am lucky I remember who I am ;) ). Some folks on the Porsche 944 mailing list did the same thing and got the same results.

The power from a CAI is almost entirely due to the resonance (sp?) of the pipe, not the temperature of the air entering the filter.

Originally posted by b-b00gie
The increased torque and horsepower in CAI's is mainly due to the length, not the cold air. The difference in air temp is barely a difference.

What he said. ;)

You slid your answer in while I was typing. Interesting that we said almost the identical thing. :D

Originally posted by b-b00gie
You wont have that problem unless the filter get completely submerged (or close to it) in water. The suction from the intake is not strong enough to suck some water up off the ground when it can easily suck in air. However if the filter is submerged and there is no air available, there will be no choice but to start sucking up water.

It won't suck it off the ground, but if water gets near the filter, it can be an issue.

Think of our cars as a 140+ hp shop vac. :D

Originally posted by Free Flow
Do any of you know of anyone who actually did have a problem with water going up the intake (and weren't driving through floods)?

I personally know two people who have hydrolocked their engines (total write-off) using a CAI. Of course, when it rains here in Texas, it's more of an Act of God. The rains were quite heavy and there was water flowing down the street in both cases, as well as producing a big splash.

Risk is not just measured in chance however. It's also measure by effect. The chance may be small, but the effect is catastrophic.

So, if you live somewhere that almost never gets large amounts of rain where you have inches of water flowing down the street, you're probably OK if you remain aware of the dangers. If you live somewhere that does get heavy rains on a regular basis, it's a clear danger. A by-pass valve is in order.

Originally posted by RCer
So, what do you think of this product www.turbozet.com (http://www.turbozet.com) a friend of mine has it in his primera, and he is very happy.

:hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe:

Perhaps I could sell him a bridge. I guarantee it will give him an additional 30 hp and 10 mpg. I can't do anything for his emissions however.

There was this bridge again!!*LOL*

The temperature of the air entering the filter under hood is pretty near ambient (just a few degrees). This is from data acquisition, not just speculation. It's also from multiple tests.

Yup, I agree wholeheartedly! I guess I worded my response badly (in terms of the quote I used, which clearly was refering to the CAI), and I should have explained.

What I really intended to say was that the air temp. is a major factor (in terms of efficiency) when there is a substantial temp. difference between ambient and intake.....the statement wasn't meant specifically for the CAI, but more general (like intercooling, etc.). Basically, I was trying to say that a few degrees DO make a big difference. :)
Sorry for the confusion! I'll be more clear in the future! :silly2:

I have seen those studies, particularly one involving a guy using heat wrap on his headers to limit heat transfer to the intake air, and the conclusions were the same as what you guys are saying.....the air intake temp. is suprisingly close to ambient.

Hey B-Boogie since u live in my area u know how thw weather is do u think i would have any problems wit sucking any water up if i got the hotshot intake?

Well I've been on rt 17 approaching Paramus once and the highway was flooded over at a low point. I didnt have a CAI (or my G20 for that matter) but if I had there would have been a big problem...

Mainly me throwing the car in reverse and going backwards down the shoulder to the last exit I passed.


For the most part you dont have anything to worry about. Wet pavement and 1 or 2" puddles are not gonna get you in trouble. We dont really get much flooding here, at least by me.


If you're worried though just go w/ the POP. Its only a 3 or 4hp difference and easier to install (you have to cut up your car w/ the CAI install).

ok cool thanx for da info

np. :sun:

What about snow? Would it be a good idea, if i wanted to go with the CAI option, to just put my stock intake back on in the winter? and would this be much of a hastle? Or should i just go no-hastle and go with the POP. I live in MN, and each winter our cars go through a beating of sand and salt...and of course snow.