Decat Question.....

[mac1979]

Hi

I've just popped a decat pipe on and have a couple of questions:

Do you still use the donut gasket? (I have)

I haven't used the spring loaded bolts, I used some bigger ones that came with the decat. Is that OK?

How the hell do you get the o2 sensor out of the old cat???

Cheers

 

[dann2707]

You'll want to heat the old sensor up around the thread with a blow torch or heat gun. Then undo it

 

[sonny172cup]

22mm spanner I believe

 

[Clioste]

As above and brut force but try not to snap it I used spanner with old vac pipe

Pushed vac pipe on the spanner and undone very easy.

 

[mac1979]

Thanks lads.

What about the donut and bolts?

 

[Clioste]

The fire ring and spring bolts use mate what's it for 172 or 182

 

[dajones]

I put a ring spanner on the lamber sensor put the cat on the floor supported by the spanner and stood on it. Risky but it worked

 

[mac1979]

All sorted, some heat and a burned leg later and it spun out.

What a difference a decat makes.......

The noise on idle is the same as previous with my stainless system, but when you give it some beans the noise is unreal.

It revs sooooooo much better through each gear too, gets down the road better

Maybe my cat was on the way out.....

 

[Cuplica]

What about mpg? See any difference? Mine (without lambda as it wouldn't come out the cat) went down to about 5mpg.

 

[Cuplica]

Yes, that's 5 (five).. needless to say I changed it back sharpish.

 

[Bluebeard]

What about mpg? See any difference? Mine (without lambda as it wouldn't come out the cat) went down to about 5mpg.

Suggest your car is broken. There's no way a decat would cause a circa 30mpg decrease.

 

[Cuplica]

Well, it went back up to around 35 when I put it all back. My theory is it panicked when it couldn't obtain readings as the lambda was unplugged. There were leaks in it too.

 

[mac1979]

Ive got the lambda in the decat. I bought one of the spacers so you still get a valid reading, maybe a little diluted, but the mpg is pretty much the same, around 35mpg.