3" exhaust on td5

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Originally Posted by uninformed

Pat am I reading correctly that you mean a 2.5" system with no muffler what so ever?

If so, who runs this on a road going vehicle?

BTW I have a Taipan Xp Vortex muffler......it changes the laws of physics!

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Quote:

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Originally Posted by PAT303

Just a resignator,my Tdi hasn't had a muffler for 10 years and it never came up once in three Blue slip inspections. Pat

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Pat, unless you've fitted an aftermarket system, the TDi uses a 2.375"/60mm system, not 2.5". (albeit nicely made, mandrel bent, etc. and the centre muffler is just a perforated straight tube)

I picked up 20km/h in third gear from fitting the big pipe over the stock system, it made that big a difference through the gears.

Hi all.

Quick update.
I had a high flow muffler put in.
It reduced the noise by half andi haven't lost any performance.
So pretty happy with end result.

She still sounds nice wheni stick the boot in.
Be interesting if fuel economy improves as its meant to.
So long as I go easy on the right foot that is.

the muffler is positioned approx just passed half way along pipe.

Thanks for the words of wisdom.

Mick

In regards to 3' pipes being used my uk tuners

IRB fit 3' there stage 3 vnt kits.

and the turbo is from turbo technics.

Would a larger intercooler do the same thing if not better?
I'm considering an allisport unit next year.
I'm thinking she'll be running real sweeeeet after that.

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Originally Posted by noogie

Would a larger intercooler do the same thing if not better?
I'm considering an allisport unit next year.
I'm thinking she'll be running real sweeeeet after that.

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With a remap on the td5 I have always thought the inlet side of the engine requires more work than the exhaust.
Uprated intercooler, full Egr removal, airbox modifications and silicone hoses as a precaution against eventual delamination.

If you can afford it the bigger intercooler is a good addition:ohyes:.

Cheers,
Paul.

I removed the egr already and done the silicon hoses also.
What's involved in modifying the air box and what is the benefit?
May as well do the lot while im at it.

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Originally Posted by noogie

I removed the egr already and done the silicon hoses also.
What's involved in modifying the air box and what is the benefit?
May as well do the lot while im at it.

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The large hump is removed from the airbox.

Some people say it decrease low down power but I can not understand how.

I have done on both my td5s running 3 different turbo, and only had good things from doing it.

also ugrading the intake piping from the airbox to the wing or snorkle is a good idea as well. Replace the all the orignal rubbish with 76mm rubber hose from a truck joint.

https://www.aulro.com/afvb/images/im...12/09/1030.jpg
https://www.aulro.com/afvb/images/im...12/09/1006.jpg

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Originally Posted by Benny_IIA

In regards to 3' pipes being used my uk tuners

IRB fit 3' there stage 3 vnt kits.

and the turbo is from turbo technics.

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Thanks mate...

Yes, correct - but their Stage 3 VNT is custom - not the std offering.

And 3" is within the designed turbos parameters.

Quote:

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Originally Posted by PAT303

...fitting a 3'' exhaust means fitting a muffler which adds a restriction so you gain nothing over a 2.5'' system ...

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Sorry Pat - back to school. All else being equal, a 3" muffler will have less pressure drop (restriction) than a 2.5" muffler.

Pressure drop ~ V^2/D

If you increase diameter of a pipe (or muffler) you reduce V and increase D.

Anyway - As Rick said - where are all the turbo failures on TD5s with 3" exhausts?

Quote:

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Originally Posted by Benny_IIA

The large hump is removed from the airbox.

Some people say it decrease low down power but I can not understand how.

I have done on both my td5s running 3 different turbo, and only had good things from doing it.

also ugrading the intake piping from the airbox to the wing or snorkle is a good idea as well. Replace the all the orignal rubbish with 76mm rubber hose from a truck joint.

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This mod to the airbox also worked well for me;).

Also in mine there was a static fan blade at the inlet side of the airbox.
Removal of this also made a big difference when combined with increased boost.
I wouldn't bother doing either without a remap installed.

Cheers,
paul.