I have a 2000 I30 (VQ30DE) Cali Spec, and have a few questions for anyone who has installed the cattman headers.

On the Cali spec VQ I understand that two of the O2 senseors need to relocated. I would think that with the cali's extra sensor that the O2 bung would need to be created not relocated. I imagine that a muffler shop could make another bung for me so Im not too worried about that.

Anyway, if the O2 situation is taken care of do any of you throw codes or CELs? The only reason I ask is because Ive heard that the ECU on the Cali Spec cars dosent like it when you remove all of the pre-cats. Is this correct?

How was installation? Does the radiator get in the way/ need to be moved or removed?

The most improtant thing is that it doesnt F*ck with the ECU. I dont want to be throwing codes left and right.

And I am only talking about the Cali Spec or I believe 2k2+ because I think they have the same emissions stuff.

TIA

 

Those O2s do not affect performance anyways. Its not a code that affects the ecu. Just lets you know the cat is there or not or bad.

You need to relocate BOTH of them to behind the main cat. Thats the only way. Or get to o2 simulators and cap off the o2 bungs.

Dixit

 

most 01s are Cali Emissions also, 4 02 sensor plugs infront of the front valve cover. I've done 02 sims on diff cars, it works just fine. I'm going to be installing headers on my Max very soon- decided not to boost the car. I have a diff car to boost

 

You can check out my Cattman Header installation on my Cardomain site... click my little WWW button...

You'll not only need to CREATE a 2nd bung on the resonator but also EXTEND 3 of the 4 harnesses.

You can email my mechanic if you want more info (email is on the cardomain site too) or you can pay him to do it...

 

I was under the impression that the O2 sensors determined if the F/A is optimum, with the exception of WOT. Therefore, if they help calculate the F/A mixture I would think they would have an effect on power. This wouldent be the first time I was wrong though.

What are these sims? I imagine they simulate the O2, but how do they do that?

Thanks Ill check out your site. By extending the harness I assume you mean lengthening the sensor wires.?

Im not that worried about the instal. What I want most is to know if people with Cali Spec (or compairable) are throwing CELs all over the place???

 

Ok, the sims simulate POST cat- meaning after cat 02 sensors, the upstream O2 sensors are before the cat- and they are the ones that tell the ECU what AF should it controll. The sensors behind the cat basically indicate if the cats are working or not. They do not sweep back and forth like the upstream sensors do, they stay at a pretty constant voltage- this is why U can run a sim instead of a 02 sensor. Hope this explains it for ya. When U have no cats, U need to run Sims or the CEL will come on.

 

I'm thinking about getting headers too. My car is Fed Spec. What differences are involved in installation? Do I have to have any bungs drilled or any wires lengthened or anything like that?

 

No... the Cattman headers alread hav the 1 O2 bung that you need. You shouldn't have to do anything but bolt them on.... lucky ba$tard!

 

I've never gotten any CELs...

 

Hnda - I take it you have the cattman headers installed on your ride or know of someone that has these?

 

I have these and like BigDog said, the last 2 O2 sensors dont do anything but check the cat, whether its there or not, or whether or not its working right. With the Cali spec cars (which mine is) you will need to extend 3 of the harnesses IF you do infact relocate your O2s. There is no choice but to extend one of them because its a primary and HAS to be used. I havent had the rear two relocated yet because of the sh!tty placement of the new bungs on the b-pipe and its running just fine, there is an SES light but other than that nothing is being bothered by those sensors not being there.

 

Ok... That makes sense.

Thanks everybody for the halp.

 

Yup, i got 'em 'n' i luv 'em!!

check out my cardomain site for pics....

 

I don't know how you do it, mang... that light would drive me ape **** for sure!!

you can see how we did my O2 bungs and how we ran the extended wires on my (say it wit' me now) cardomain site...

 

The reason it doesnt even bother me is because its been on since before i started modding the car. For the P0135 code...and thats still the only code it throws now, well that and whatever the code is for no cat. So it doesnt bother me, Ill get the O2 bungs welded into a new exhaust...i only bought this one because it already had them, but if i had known they were gonna be in such a sh!tty spot i wouldnt have bought it...but o well...itll be ight....

 

yo hnda, check your pms