Standard exhaust with Free flow downpipe and cat

[ExAreSix]

  fordboy1981 said:

  ExAreSix said:

And std cat is quite a good unit. Better than the aftermarket high flow cat I had installed (25rwkw better in fact)

Just a shame the std cat couldn't handle the power. 

that doesn't make sense dude! if the standard cat makes 25rwkws more then your current aftermarket cat, then it does handle the power and your aftermarket one doesn't!!

please explain??

Dave.

Sorry... Was a bit vague.

My standard cat collapsed. It shat itself.

It flowed great... 25rwkws better than my aftermarket job. Till the 'brick' collapsed and blocked itself up.

[Guest XR6Twish]

  Quote

Std dump pipe is NOT of efficient design.

Have you actually had a close look at the factory dump? I think you will find - irrespctive of what you refer to in the other thread - it is a good thing.

Producing a fabricated dump pipe with a secondary wategate pipe is a great idea - but only once you start getting really serious. For applications like most of us are using, I seriously don't think it's worth considering.

Stick with the factory dump I say.

Actually, having said that I think I need one, a dump that is

[ducatijb]

  XR6Twish said:

Producing a fabricated dump pipe with a secondary wategate pipe is a great idea - but only once you start getting really serious. For applications like most of us are using, I seriously don't think it's worth considering.

Stick with the factory dump I say.

Actually, having said that I think I need one, a dump that is

XR6Twish,at what power levels would you say the factory dump pipe is good to??

[Turbo6man]

  XR6Twish said:

  Quote

Std dump pipe is NOT of efficient design.

Have you actually had a close look at the factory dump? I think you will find - irrespctive of what you refer to in the other thread - it is a good thing.

Producing a fabricated dump pipe with a secondary wategate pipe is a great idea - but only once you start getting really serious. For applications like most of us are using, I seriously don't think it's worth considering.

Stick with the factory dump I say.

Actually, having said that I think I need one, a dump that is

On what experience do you base this please?

If you have read the other thread that was identified above, could you please rationalise for us if you have better information?

[ExAreSix]

  XR6Twish said:

  Quote

Std dump pipe is NOT of efficient design.

Have you actually had a close look at the factory dump? I think you will find - irrespctive of what you refer to in the other thread - it is a good thing.

Producing a fabricated dump pipe with a secondary wategate pipe is a great idea - but only once you start getting really serious. For applications like most of us are using, I seriously don't think it's worth considering.

Stick with the factory dump I say.

Actually, having said that I think I need one, a dump that is

Yes, I've seen the standard dump. Was a pleasant surprise to see it was quite a large diameter dump.

BUT both Wastegate and Exhaust gases flow through it. I'm no expert on the subject, but I would imagine that having two gas streams, both at differing velocities (Wastgate being on/off), running into each other in a confined space, would cause quite a bit of turbulence.

Turbulence is bad, mmkay.

Having the wastagate gases introduced to the exhaust system after the initial bends in the dump pipe would substantially minimize turbulent flow through the rest of the exhaust.

That's my understanding.

[Biggy]

I was thinking that by having the separate dump pipe system including a good free flow cat and the rest standard then for most how wish not to spend great sums of money could have a eng that would breath that bit better. Most systems allow you to do the rear first but all you get is noise so why not start at the front since the standard system has a reasonable note already. The MRC front pipe into the standard system would be the way to go.?

Biggy

[ExAreSix]

  Biggy said:

The MRC front pipe into the standard system would be the way to go.?

Biggy

I reckon so

My plan also... Though I might get a custom dump made, but similar to MRC.

Keep us updated if you go ahead. Before and after dyno prints a must!

[turb06]

  Biggy said:

I was thinking that by having the separate dump pipe system including a good free flow cat and the rest standard then for most how wish not to spend great sums of money could have a eng that would breath that bit better. Most systems allow you to do the rear first but all you get is noise so why not start at the front since the standard system has a reasonable note already. The MRC front pipe into the standard system would be the way to go.?

Biggy

Biggy - I agree that would be a way to go, I think even on a near stock or stock engine the changing of the dump pipe would be good, I am getting a local exhaust shop to make me one to hopefully save some $$$ and put on a high flow cat too.

I also chopped the centre muffle section out, I did this to make it a bit louder. I would suggest doing this also as word is the centre muffler isnt the best straight through mufler, and if you find it a bit too loud chuck some hotdogs on to shut it up a little, I think the note with the centre muffler gone to be awesome and not intrusivley loud.

Dazza.

[Biggy]

Hi Turbo6

Let us all know how it goes if you do it. Have yet to listen to one with the center muffler out before I do it , want a good deep note not harsh or droney.

Biggy

[turb06]

  Biggy said:

Hi Turbo6

Let us all know how it goes if you do it. Have yet to listen to one with the center muffler out before I do it , want a good deep note not harsh or droney.

Biggy

will do.

The exhaust note is nice and deep, I think it is anyway, its a little loud on startup but give it a few minutes to heat up and it quitens down.

Dazza.