obekediamondfuto:


the boss,, I sight u.
as for me and my household...... the cat delete will increase fuel consumption in an 03 4cyl Camry, I've been there and done that. I stick with siena on this. except you can trick the o2 sensors to work with the new no-cat con config(defouler),the downstream or post cat o2 sensor will send signals to the ecu which will also factor in the new free flow of air. ECU is just a GIGO computer, it will definitely try to compensate for the perceived excess air flow(lean) and command more fuel through the injectors.

like I said peeps, 03 Camry 4cyl


but oga boss what's ur take on this issue

GAZZUZZ:


my peugeot 406 I4 worked better without a catalyst (better fuel efficiency)

Coldplay007:
Wait oo.. does this mean Sienna used to Bobo us all those years ago..
Cos all he wrote up there is just techie bobo..

obekediamondfuto:


let's experiment it on OUR evil spirit, back then in otown.... didnt know sh...t about cars, sent my car for servicing and car came back sounding different. drove it home (5mins) fuel entered reserve from a lil less than 1/4 tank. beginning of woes........ summary, Mech stole my cat con and vehicle guzzles fuel like nothing I've seen before. u don't want to know how that story ended

GAZZUZZ:



The young man is on a solo mission somewhere in the middle east....

badebillions:


Cat delete has no significant impact on fuel economy as long as you use spacers.

obekediamondfuto:


let's experiment it on OUR evil spirit, back then in otown.... didnt know sh...t about cars, sent my car for servicing and car came back sounding different. drove it home (5mins) fuel entered reserve from a lil less than 1/4 tank. beginning of woes........ summary, Mech stole my cat con and vehicle guzzles fuel like nothing I've seen before. u don't want to know how that story ended

chukel:
the issue may not have been removal of the catalyst. They usually remove and replace with wire mesh/gauze which restricts exhaust air. This is actually what caused the increased fuel consumption and not removal of a good catalyst converter.

chukel:
Right question is which catalyst are you guys talking about. If it's the one under the vehicle, then no negative effect on fuel consumption. In fact if it was clogged prior to removal, you will notice improved fuel economy. If it's the other one just in front of the radiator, then removal may affect fuel consumption.

obekediamondfuto:


thank you so much, that's the one I'm referring to!
the one behind the radiator is the actual cat converter IMHO hence the names of the different sensors: pre and post cat! but y is it so damn expensive?

obekediamondfuto:


thank you so much, that's the one I'm referring to!
the one behind the radiator is the actual cat converter IMHO hence the names of the different sensors: pre and post cat! but y is it so damn expensive?

chukel:
Right question is which catalyst are you guys talking about. If it's the one under the vehicle, then no negative effect on fuel consumption. In fact if it was clogged prior to removal, you will notice improved fuel economy after removal. If it's the other one just behind the radiator, then removal may affect fuel consumption.

bravolad:


That's the bank 2 therefore, there will be drop in performance and one major effect is decreased mpg.

bravolad:


That's the bank 2 therefore, there will be drop in performance and one major effect is decreased mpg.

chukel:
Right question is which catalyst are you guys talking about. If it's the one under the vehicle, then no negative effect on fuel consumption. In fact if it was clogged prior to removal, you will notice improved fuel economy after removal. If it's the other one just behind the radiator, then removal may affect fuel consumption.

obekediamondfuto:


let's experiment it on OUR evil spirit, back then in otown.... didnt know sh...t about cars, sent my car for servicing and car came back sounding different. drove it home (5mins) fuel entered reserve from a lil less than 1/4 tank. beginning of woes........ summary, Mech stole my cat con and vehicle guzzles fuel like nothing I've seen before. u don't want to know how that story ended

erico2k2:

You seriously need to upgrade or update ur Auto knowledge . U scored 2/100 there

chukel:
if so, please educate me and others who share same ideology here.

erico2k2:

Well yoy ought to have taken into account how the O2 sensor will feed yoyr ECU with data .

erico2k2:

Well you ought to have taken into account how the O2 sensor will feed yoyr ECU with data . The bank 2 sensor compares readings from the other O2 sensor and this gets feed back to the ecu . This determine the Richness of fuel or oxygen .

chukel:
I think you should go back and read my comment well. Bringing in bank 2 means you are already talking V6. If you noticed I avoided using terms bank 1 bank 2 to make it easy to a non car savvy person to understand. That cat behind the radiator can be bank 1 or bank2 depending on how many cylinder the car has. My question is, is there a sensor after the cat under the car. I want to learn.

erico2k2:

Yes therr is a sensor . V6 engines with two cats ha e four O2 sensors

chukel:
you still don't get me. And V6 has a 3 way cat system in Toyota. The third cat is under the car. Gazzuz please need the pic

erico2k2:

Three Cat converters ? What's the 3rd for ?
In yoyr pic up there it only shows two cat converters . The banks are two 1 and 2.

chukel:
u should know this naa. U see the TWC? Three way catalytic converter. That's the 3rd. Solely for emission. Environmental protection.

erico2k2:

The third box is not a cat covert .even you diagram does not say so.however therr are 4 sensors in your diagram . Banks 1 amd 2 one is left the other right I'm waiting to see a diagram with 3 cat convert

chukel:
stop dragging. If it's not a catalytic converter, pls what is it. Read up Toyota exhaust system with special reference to the catalytic converters. My diagram also didn't mention any catalyst. That diagram centered on the sensors. Check up the meaning of TWC with respect to Toyota exhaust system.
PS. I am still learning. But I want to learn well with evidence

chukel:
u should know this naa. U see the TWC? Three way catalytic converter. That's the 3rd. Solely for emission. Environmental protection.

erico2k2:

[s]The third box is not a cat covert .even you diagram does not say so.however therr are 4 sensors in your diagram . Banks 1 amd 2 one is left the other right I'm waiting to see a diagram with 3 cat convert [/s]