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Old 01-14-2013, 06:34 PM   #21
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For those stating that by removing the cat you will loose power, you are clueless. You gain power by removing restriction. Either get a tune that turns off the rear o2 sensor or install an o2 cheater to trick the ECU.

Please do some research before giving others advice.

Catalytic converters need to reach and maintain a certain temp to work. That is why they are positioned close to the engine. Moving them further from the engine renders them useless.
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Old 01-14-2013, 06:44 PM   #22
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Quote:
Originally Posted by ah1f39 View Post
For those stating that by removing the cat you will loose power are clueless. You gain power by removing restriction. Either get a tune that turns off the rear o2 sensor or install an o2 cheater to trick the ECU.

Please do some research before giving others advice.

Catalytic converters need to reach and maintain a certain temp to work. That is why they are positioned close to the engine. Moving them further from the engine renders them useless.
X2 on this. there may be a reason that the zetec and svt focus both regularly perform BEST in open header configuration on the dyno and at the track. the less restrictive you can make the exhaust the more power you will make.
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Old 01-14-2013, 09:57 PM   #23
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"...For those stating that by removing the cat you will loose power, you are clueless. You gain power by removing restriction. Either get a tune that turns off the rear o2 sensor or install an o2 cheater to trick the ECU..."

Apparently reading comprehension is not in your abilities as I stated pretty clearly:

"...If you want to do it right, you delete the cat with a custom-welded exhaust, and replace the engine computer with a different one programmed for no cat..."

For the OP asking for a cheater pipe - because he's too cheap to walk into an exhaust shop and have a pipe bent with some flanges welded onto it - do you honestly think he's going to spend the money on a "tune" or o2 cheater? Really?

For most people out there looking to delete the cat, all they want to do is punch the cat out and tell themselves they are increasing HP. They are not interested in actually removing the cat properly, and reprogramming the ECU. And if you think their car has ever been on a dyno I have some beachfront property for sale in Florida cheap.

Please don't encourage the wannabes in the performance forums. We have way too many kids driving around with chrome exhaust tips, fart cans, and punched out cats who think their Focus has an extra 100hp.
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Old 01-14-2013, 10:09 PM   #24
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Well everyone starts somewhere. Giving incorrect information is not helpful. Try encouraging people to make useful mods. Don't assume they are too cheap or not interested in doing things correctly.
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Old 01-14-2013, 10:53 PM   #25
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There have been proven gains on the focus to show that it does gain power albeit small if still using a shorty header but bigger ones mainly due to the whole manifold being replaced by a long tube header, on the SVT removing the stock cat will not gain hp but you will gain tq has that motor is already pretty much maxed out from the factory. Just like the myth that a bigger exhaust will make you loose power as well is also false (for our cars at least) 3" exhaust has been shown to be the best, that's why we recommend 2.5" or bigger. Loosing power due to the O2's not being able to meter right is just boloney. Please read through our performance sticky threads before posting any other false information. Not every car is the same so don't assume that what goes for one car works on ours. Also when removing the cat it is a must to get a tune to correct any problems that may arise from the deleting it (like the CEL) plus it optimizes any other mods done to the car so you get the maximum benefit from them.

Performance sticky threads HERE
It does cause any car running OBDII to have trim issues and fuel metering issues I don't want to argue. However dynos, dealerships and tuning techs and performance shops dont all lie, the o2 sensors arent there for performance but there failure or lack of proper function will cause performace issues.
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Old 01-14-2013, 11:10 PM   #26
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The second o2 is for emisions not performance. It measures the ammount of unburned hydrocarbons after the cat
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Old 01-14-2013, 11:24 PM   #27
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The second o2 is for emisions not performance. It measures the ammount of unburned hydrocarbons after the cat
You are 100% right except you left out that when the and down stream o2 sensor detects high emissions it leans out the fuel trim which will cause poor performance. Also whn the enginelight comes on due to o2 issues the computer turns to a preset loop.
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Old 01-14-2013, 11:30 PM   #28
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You are 100% right except you left out that when the and down stream o2 sensor detects high emissions it leans out the fuel trim which will cause poor performance. Also whn the enginelight comes on due to o2 issues the computer turns to a preset loop.
Yes, and in Fords it is called '"limp home mode". If a $20 o2 cheater is installed the ECU will never detect an issue or enter the loop.
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Old 01-14-2013, 11:33 PM   #29
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Yes, and in Fords it is called '"limp home mode". If a $20 o2 cheater is installed the ECU will never detect an issue or enter the loop.
And o2 cheater don't allow for proper fuel metering they keep it set at one trim.
If properly removed and tuned you can get more power, but if anyone thinks running a car with the check engine light on is healthy or a proper performance moding there wrong.
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Old 01-14-2013, 11:57 PM   #30
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Nobody said drive with the CEL on.
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