Really wanting to de cat my uk tt but have heard that it can cause damage to the turbos,my turbos have been rebuilt and would hate to damage them, i have heard so many conflicting views can someone please clarify.A mate of mine says his decat made a big difference to his performance and is offering me some de cat pipes foc.

iirc It's more to do with the change in pressure allows old oil seals to leak. Since you have had yours rebuilt you should be fine.

I had a TT auto a few years ago, ticked over nice and clear. Had a cat back system fitted, still fine. Removed the cats and instantly had blue smoke on tick over every morning! i belieive de-cating removes the required back pressure the turbo seals require?

 

Id personally not de-cat again.

de-catting does no damage whatsoever, it will just highlight a problem with the turbo seals if they are already going but will not cause the problem in the first place

de-catting does no damage whatsoever, it will just highlight a problem with the turbo seals if they are already going but will not cause the problem in the first place

 

:thumbup1:

All that said, the system was designed with a certain amount of back pressure within it. The catts maintained that back pressure.

 

As turbo's wear with age and the back pressure once dramatically dropped by removing the catts increased this wear on the seals/rings.

 

On engines with new or rebuilt turbo's, it does increase the wear rate, however being new parts etc, it just does not happen as quickly as on Zeds with stock turbo's.

 

Turbotechnics some many years ago tried and it worked to a certain point, using a kit to try and maintain the pressure on the rings for the 300zx only.

Turbo Dynamics then came out with the Stagger gap seal, again fitted to the 300zx range of turbo's they sold and these derived from turbo's used in high performance racing engines with turbo's that need reduced back pressure.

 

In short, damage is the wrong word, increased wear rate is better. The newer the turbo the better and longer it will last, but the ring does wear quicker with no catts.

Smithy

I was faced with same dilema, ok turbos with Uk cats, then i decatted with a full s/s japspeed system. I noticed a big difference, in power and spool up. engine seems to sound better and pull quicker.

No probs a year plus on, but it would find any weakness the turbo's have.

But defo made an improvement.

Thanks guys, but see what i mean about conflicting views?

LOL Yeah that happens a lot here mate.

This subject has been done a thousand times, so search may help or actually make it worse! for you to decide.

 

I can tell you the reference made to the 2 turbo companies above is bang on, cos i used to sell turbo's for a few years and had worked with them a lot!

smithy

LOL Yeah that happens a lot here mate.

This subject has been done a thousand times, so search may help or actually make it worse! for you to decide.

 

I can tell you the reference made to the 2 turbo companies above is bang on, cos i used to sell turbo's for a few years and had worked with them a lot!

smithy

 

I take on board what you have said about premature wear,as long as its not halving the life of the turbos ,typically how miles roughly do turbos last.

I take on board what you have said about premature wear,as long as its not halving the life of the turbos ,typically how miles roughly do turbos last.

 

All depends on use and servicing really.We have a van at work I have just put a Turbo on,it had 220,000 mILES on!

mine was de-catted about 6 years ago tt auto,goes like a train,np probs as yet....