Highflow Cat

[LTSBGY]

I have been reading the exhaust threads but am not 100% sure and understand. My question is, can I put a highflow cat with just my generic 8psi and it will be ok? Will it go into limp mode? Or it doesnt matter whether you have edit and generic tunes you must get custom tune after installing highflow cat?

Thanx

Nesh

[Fat-Tony]

I think you should be ok running a high flow cat with teh generic tune, lets say I THINK, because the torque tags have been lifted some1 please feel free to correct me if im wrong

[RAPHOON]

It's not the limp mode you need to be concerned with, as the parameters have been adjusted to ensure overboost will not trigger it.

As you would know, more flow = more boost. Therefore, with everything else being the same, you need to be careful about leaning out.

[LTSBGY]

So there is no way to tell whether its leaning out or not unless you put it on the dyno?

I will be getting a custom tune done, im just waiting until it gets near the end of factory warranty running out which is january. Iv got 968's and I want a highflow cat and im still undecided whether to do valve springs aswell as they are pricey to have done.

Nesh

Edited 18/08/06 02:14 AM by nesh

[Damo]

So there is no way to tell whether its leaning out or not unless you put it on the dyno?

If you have the funds available for a pod (see Miss Aly) and a couple of guages, get yourself an AFR guage. I had said in a previous post (as had others) that these seemed pretty useless but I saw it being useful when a mate's VY S was pinging. He found it was leaning out under full throttle - the reason was oil from his K&N panel filter had dirtied his MAF sensor & was confusing the computer. Cleaned it up and good as new. Saved him an expensive one-off trip to a dyno.

Too bad they look rice at night.

[Fat-Tony]

So there is no way to tell whether its leaning out or not unless you put it on the dyno?

I will be getting a custom tune done, im just waiting until it gets near the end of factory warranty running out which is january. Iv got 968's and I want a highflow cat and im still undecided whether to do valve springs aswell as they are pricey to have done.

Nesh

←

The boost should self correct itself when installing a hi flow cat, its just if the exhaust is to free flowing, the small factory wastegate might not be able to bleed enough air to componsate, this will then cause your boost spike.

If your going to the point of doing injectors, do your valve springs otherwise your wasting your time doing injectors.

[ROLMDL]

were abouts is the MAF Sensor on the T