de cat question

[s3gazz]

hi all
having my s3 de catted today can anyone tell me the differances ill notice or ill get from it please tar

 

[DaveA3]

faster spooling an increased sound and low end torque

 

[s3gazz]

faster spooling an increased sound and low end torque

tar dave its on a standed exhaugst tho will i still notice all that mate

 

[dany2k]

the cat restricts exhaust gas flow, so no matter if you've got a standard or otherwise, u'll notice the above. i dont have the balls to do it myself, good on ya.

 

[DaveA3]

yeh should do mate. u getting a larger downpipe also? that will do the above to a further extent

 

[S3 Nattie]

When i put my downpipe and decat the turbo spool was noticably quicker and pulls harder but you probably will lose some end end torque due to the increased diameter and less back pressure.

 

[s3dave]

A Turbo should not need back pressure, maybe a slight bit

 

[S3 Nattie]

Ye too much back pressure on a turbo engine is not good as with pressure you tend to get heat which as everyones probaby aware is the enermy as such on turbos but some back pressure can help with the torque.

Having a more freer exhaust will help get the exhuast gases out and the quicker you can get it out the quicker you can get it in but likely to lose a bit a torque due to the less back pressure. Thats how i understand it, correct it if its wrong lol.

 

[s3dave]

The turbo itself creates back pressure so as little as possible after that

 

[Welly]

Is it a decat, or a downpipe and decat?

 

[S3 Nattie]

True far point dave.

 

[s3gazz]

Is it a decat, or a downpipe and decat?

just a de cat welly iv notice a dif already spoll wize but car not running good anyway so wont no till its fixed

 

[superkarl]

Does it have a hole for the post cat lambda? ThAts what I'm worried about

 

[s3gazz]

Does it have a hole for the post cat lambda? ThAts what I'm worried about

ye it does mate in need of down pipe now an cat back

 

[S3 Nattie]

Does it have a hole for the post cat lambda? ThAts what I'm worried about

The post lambda is useless if you have a decat though as its only there to monitor the condition of the cat, but you wont have one lol.

 

[superkarl]

So you could just disconnect it? Which would probably bring the engine light on

 

[S3 Nattie]

Ye, its useless. When I put my downpipe and de cat on I couldn't get the lambda sensor out of the original cats (welded on) so didnt even have the sensor on my car for a few days till I got the sensor out.

You will always have a fault code till its mapped out when you get your car mapped but it doesnt effect the way the car runs. I had a EML on at first but once I deleted it, the light hasnt come on but the code still there.

 

[s3gazz]

The post lambda is useless if you have a decat though as its only there to monitor the condition of the cat, but you wont have one lol.

i just bought one few days ago gutted wish i could take it back lol its the other one i needed