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Old 02-16-2004, 10:04 AM   #1
kaweahnet
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2003 PZEV Stock CAI

2003 PZEV ZX3 comes with a CAI from the factory - just noticed it this weekend. I don't see how it can be improved from the design other than maybe chaning out the filter to a K&N. There is some type of meter that I can see, I can't tell whether it's a moisture bypass or what.

I see a lot of differences between my motor layout and most of the pics online. The most major difference is that my motor is sitting the other way; with the intake forward and the exhaust to the back. Also just installed an alarm this weekend too and the 2002 wiring diagrams don't fit the 2003 exactly, I hope to get an accurate one posted soon. Still can't find the tach sensor though - the wire they say to look for is at the coil and there is no friggin coil in this car!!! I found the color they recommended but the meter tells me it does nothing with RPM changes. Oh well, the whole reason for post is this question:

Has anybody done any improvements on the 2003 Stock CAI that I should be aware of?


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Old 02-16-2004, 11:21 AM   #2
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As far as I know you cannot change the filter out of the factory intake, it is completely sealed and to be replaced every 150,000 miles. There are aftermarket CAI's out there, but as for modifying the stock one, I don't think you can do much with that.
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Old 02-16-2004, 11:35 AM   #3
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why would u want to anyways? If your gunna spend any money, you should at least do it right. Get a real CAI.
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Old 02-16-2004, 11:45 AM   #4
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Well, because I've heard some pretty big horror stories about CAI's, especially with respect to water intake. I don't want to cause problems if it's not going to give me a decent gain. I just had thought that maybe somebody might have done something to the stock, versus changing from stock CAI (which doesn't look to bad) to an aftermarket CAI.
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2003 Ford Focus PZEV ZX3 (my daily driver).
2003 BMW Z4 - 3.0i 6-speed
2003 Rocket RK-100 80cc Shifterkart (when on the track).
http://www.thekillions.com/dave/phot...0290-thumb.jpg
Performance mods: Marcy Intake.
Interior mods: Lynx 2000 Remote start alarm and aftermarket door locks. 15% Tint (50% on side roll-ups).
Exterior Mods: Motegi FF5 18" wheels & Yokahama Parada Spec 2 tires (215-40/ZR18). H&R 1.4" springs. 5" Super Shorty Billet antenna.
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Old 02-16-2004, 01:02 PM   #5
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Re: 2003 PZEV Stock CAI

Quote:
Originally posted by kaweahnet
2003 PZEV ZX3 comes with a CAI from the factory - just noticed it this weekend. I don't see how it can be improved from the design other than maybe chaning out the filter to a K&N. There is some type of meter that I can see, I can't tell whether it's a moisture bypass or what.

I see a lot of differences between my motor layout and most of the pics online. The most major difference is that my motor is sitting the other way; with the intake forward and the exhaust to the back. Also just installed an alarm this weekend too and the 2002 wiring diagrams don't fit the 2003 exactly, I hope to get an accurate one posted soon. Still can't find the tach sensor though - the wire they say to look for is at the coil and there is no friggin coil in this car!!! I found the color they recommended but the meter tells me it does nothing with RPM changes. Oh well, the whole reason for post is this question:

Has anybody done any improvements on the 2003 Stock CAI that I should be aware of?
That meter you see on the factory intake measures pressure drop across the filter. It is a completely sealed system (for emissions reasons) designed for 150,000 miles of normal use (whatever that is) but if it starts to clog sooner, that meter will show red. The factory filter cannot be replaced except as an entire intake unit.

The Duratech 2.3 liter engine in the PZEV car is turned around, you are correct, vs. a 2.0 liter Zetec. Completely different animal.

I am not surprised the '02 wiring diagrams don't match the '03 PZEV very well. Completely different animal, as I said. It's not just a different engine mechanically, but the ECU is completely different as well.

You are correct, it doesn't have "a" friggin coil. It has four. One for each plug, located right in the plug cap. It is called C.O.P. for coil-on-plug ignition. I don't know how to connect a tach, but it's possible that you can't. The wire you would look for on a conventional ignition is the one being switched by the igniter module. The C.O.P. system has basically four separate igniter modules. You could easily locate one of the igniter signals to one of the four coils, but, that signal would be 1/4 as fast as you want.

I haven't heard anyone on this forum discussing mods to the factor intake - Marcy, Focus Central, and Focus Sport seem to be the popular aftermarket options.
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Old 02-16-2004, 01:09 PM   #6
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Re: 2003 PZEV Stock CAI

Quote:
Originally posted by kaweahnet
2003 PZEV ZX3 comes with a CAI from the factory - just noticed it this weekend. I don't see how it can be improved from the design other than maybe chaning out the filter to a K&N. There is some type of meter that I can see, I can't tell whether it's a moisture bypass or what.

I see a lot of differences between my motor layout and most of the pics online. The most major difference is that my motor is sitting the other way; with the intake forward and the exhaust to the back. Also just installed an alarm this weekend too and the 2002 wiring diagrams don't fit the 2003 exactly, I hope to get an accurate one posted soon. Still can't find the tach sensor though - the wire they say to look for is at the coil and there is no friggin coil in this car!!! I found the color they recommended but the meter tells me it does nothing with RPM changes. Oh well, the whole reason for post is this question:

Has anybody done any improvements on the 2003 Stock CAI that I should be aware of?
Had you given any thought to maybe doing a search of the PZEV section of this very forum ?? May want to look into it. I hear it is all the rage these days.
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Old 02-16-2004, 01:56 PM   #7
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I want to first off give major props to the CAI by Marcy. I have had it for 2 months now and it is awesome. The Horsepower gains are close to 10FWHP...how much more horses do you want to get from a Intake bud? 10WHP is hella hard to get in any other car. You'd be lucky to get 10WHP from an intake in a civic.

Anyways, about the water problem...walter created his CAI so you can use your OEM splash guard with it. The slash guard will protect your CAI intake from sucking up water. Just as long you don't decide to plunge your front end into a lake anyways. Also...if you are still skeptical about it....by the AEM bypass valve and slap that on there along with your splash guard just to be safe. Anyways...those are just my suggestions.

I dunno anything about the electrical system you are trying to do...I just installed my sound system so I am sorry I Cannot help ya there!
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Old 02-16-2004, 03:41 PM   #8
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Quote:
Originally posted by kaweahnet
Well, because I've heard some pretty big horror stories about CAI's, especially with respect to water intake. I don't want to cause problems if it's not going to give me a decent gain. I just had thought that maybe somebody might have done something to the stock, versus changing from stock CAI (which doesn't look to bad) to an aftermarket CAI.
Whats a decent gain? I would say that the 8-10 whp you get from this is pretty decent.
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Old 02-16-2004, 05:08 PM   #9
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a bypass valve will fit and work with the Marcy???? does anyone have that?
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Old 02-16-2004, 05:59 PM   #10
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The big gains you get from an aftermarket CAI is you are replacing the restrictuve factory parts with free-er flowing parts. If you are worried about water, keep the splash gaurd on, and don't submerge the bumper.
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