2005: 2.0 136hp vs 2.0 130hp PZEV

zxtunerdotcom · Mar 16, 2005

well - i got my 2005 ford book in the mail yesterday, and proceeded to see what can be done to trick the pcm to throw a little more spark and fuel - when i started noticing the apparent differences between the 2005 2.0 federal motor and the 2.0 pzev version.

the pzev has 2 catalytic convertors, with 3 - count 'em - THREE o2 sensors, where the 2.0 fed engine has the normal 1 cat w/ 2 o2 sensors.

the pzev has an electric air pump assy that pumps clean air into the exhaust manifold

all the 2005's have - get this - two iat sensors, a maf AND a map sensor, a fuel temp and fuel pressure sensor, as well as a cyl head temp sensor.

phew!

talk about sensor checks and balances!!!

it gets better though - the 2.0 does not have balance shafts as does the 2.3, but does have an IMRC setup, but without the additional Intake "tuning valve" the 2.3's have.

well, enough techhie talk for now. i need to establish my plan of attack on this bad boy...

it lookks like part one will be a federal version pcm - lol.

rob

Az 05 Focus · Mar 16, 2005

the 2005 2.0 focus puts 136hp to the flywheel, but to the wheels, you are looking at about 115whp. i have a 2005 2.0 duratec and i have intake and full exhaust and i am putting 122hp to the wheels

blight0x · Mar 16, 2005

What kind of CAI and exhaust.. just curious. I've got the FocusSport CAI and Stealth Exhaust. Nice to know ill be throwing down about 122whp.

CopperFoci · Mar 17, 2005

alright alright, good to know where i stand with the whp, thanks

Az 05 Focus · Mar 17, 2005

i have the focus sport cool flo race intake and full borla exhaust

Hexx · Mar 28, 2005

So how will this effect getting rid of the 2nd cat (off-road car of course

) and throwing on a cat-back (ones made for the current 04 and before foci)?

I havent had a chance to really get up under and check the o2s out.

zxtunerdotcom · Mar 28, 2005

my initial thoughts are to put on a header, leave cat #2 as the main cat, add a mil eliminator to cat #2 and cat #3's o2 sensors, and remove the rear muffler/resonator and replace with either straight pipe or a bullet style muffler.

rob

Hexx · Mar 28, 2005

zxtunerdotcom said:
my initial thoughts are to put on a header, leave cat #2 as the main cat, add a mil eliminator to cat #2 and cat #3's o2 sensors, and remove the rear muffler/resonator and replace with either straight pipe or a bullet style muffler.

rob

That might not sound too good though. I just want to strap on a already good sounding cat-back, get rid of the 2nd cat, and go with things. Reason I say this is, is because finding the right pipe diameter, cats, and muffler combo isnt too easy to get a good sound throughout all the rpms. But I figure if I transform my exhaust into a non-pzev type kinda thing

then people already have (pre05) good sounding exhaust setups. Yes a header will make a tone difference, and depending on other mods too.

But anyways, going back to your idea....which cat has all the O2s hooked to it? I remember reading somewhere it was like the first cat had 2, the header had one, and the 2nd cat was just "there" and wasnt monitored. If that is the case, then removing the 2nd cat will not cause any codes to trip.

soffiler · Mar 28, 2005

Hexx said:
...But anyways, going back to your idea....which cat has all the O2s hooked to it? I remember reading somewhere it was like the first cat had 2, the header had one, and the 2nd cat was just "there" and wasnt monitored. If that is the case, then removing the 2nd cat will not cause any codes to trip.

This is how the stock PZEV exhaust is configured:

First catalytic converter is built into the exhaust manifold, which some refer to as a "manicat". The first O2 sensor is located, I believe, right in an exhaust port, even before the manifold. (Not totally sure on the placement but I'm close). The function of the first O2 sensor is to monitor raw exhaust gas, pre-cat, for oxygen content, which is used by the PCM to control fuel injection and A:F ratio.

The second O2 sensor is located roughly in the middle of the manicat. Its function is to monitor the performance of the first "brick" (catalytic material) of the manicat. This is mandated by law. If the cat is working, the second sensor sees a different signal than the first one, and all is well. If the cat quits working, both sensors see the same signal, and the PCM flags this as a bad cat.

Downstream, you find the 3rd O2 sensor and the second cat. As I understand, the second cat is not monitored at all. The function of the third O2 sensor is a fine-tuning control of long term fuel trim.

Hexx · Mar 28, 2005

The last section you posted about the fuel trim and what not, I have heard the same thing. This is why I dont see why it would be TOO difficult to remove it....but you would need to fool the computer into thinking that sensor is not there (or disable it).

soffiler · Mar 28, 2005

Hexx said:
The last section you posted about the fuel trim and what not, I have heard the same thing. This is why I dont see why it would be TOO difficult to remove it....but you would need to fool the computer into thinking that sensor is not there (or disable it).

I don't have a lot of solid info on that third sensor but I'll keep looking. It is quite possible that the computer has a way to monitor this sensor, at least for basic functionality. So if it was entirely gone, it could throw a code. Keep in mind I am just guessing here. If there was a way to retain the sensor, regardless of whether the second cat was present, you would probably be OK.

2005: 2.0 136hp vs 2.0 130hp PZEV

zxtunerdotcom

Az 05 Focus

blight0x

CopperFoci

Az 05 Focus

Hexx

zxtunerdotcom

Hexx

soffiler

Hexx

soffiler

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