Cat replacement pipe

[ben106rallye]

Hello, newbie here

has anyone fitted *just* a cat replacment pipe in the OE exhaust system and do you have any evidence of it making a difference?

replacing the cat on my 106Rallye mk1 made a difference but then the exhaust must be at least a ten year old design on that, has cat technology moved on enough for it not to make much difference?

 

[Rich-D]

Quote: Originally posted by ben106rallye on 19 November 2003


has anyone fitted *just* a cat replacment pipe in the OE exhaust system and do you have any evidence of it making a difference?

Yes, I know people that have de-catted a car and left the standard exhaust on and it does make a difference.

The cat is usually the restrictive part of the system...

 

[ben106rallye]

and what sort of difference is that?

greater throttle responce, more power?

does the cup have a double lamda sensor?

 

[Tom_16v]

better power and torque, throughout the rev range.

 

[Griff]

Getting a Janspeed sport cat fitted next month so I can report back then.

 

[McBunny]

ben yes it has a twin lamda

 

[ben106rallye]

wont it get confused then?

 

[Griff]

Thats why theres the option of sports cat rather than no cat at all.

 

[ben106rallye]

why have a cat when the first MOT isnt for another 3 yrs?!

 

[Tom_16v]

Quote: Originally posted by ben106rallye on 19 November 2003

why have a cat when the first MOT isnt for another 3 yrs?!

Its still illegal to run a de-cat.

(Not that it bothers me)

 

[Griff]

Quote: Originally posted by ben106rallye on 19 November 2003

why have a cat when the first MOT isnt for another 3 yrs?!

You already answered your own question above, i.e without the cat the lamda sensor will give incorrect readings.

 

[McBunny]

actually it does not seem to need the second sensor at all as me and a few others are quite happily running full decats on 172s and cups with no problems at all

not trying to step on griffs toes but mines been fine for over 2k miles

 

[Griff]

In theory it "should" need the second lambda but as Mike said its been done sucessfully.

 

[ben106rallye]

Quote: Originally posted by Tom_16v on 19 November 2003

Quote: Originally posted by ben106rallye on 19 November 2003

why have a cat when the first MOT isnt for another 3 yrs?!

Its still illegal to run a de-cat.

(Not that it bothers me)





apart from that little detail

 

[ben106rallye]

thanks guys for your replies

waiting for your new car is a pain isnt it!