GU Exhaust Upgrade

Disagree with parts of few comments...

2 3/4 is around optimum dump size for a ZD30 either Di or CRD from an engineering theory standpoint.
The reason bigger isn't always better is to do with a few principles including Exhaust gas mass increases due to cooling and Exhaust pressure pulses at the turbine vanes.
Larger dia means the flow is better and the Turbo will spool quicker but that isn't an infinite gain IE at some point the bigger pipe produces no further gain and other issues now start to impact on the Turbo etc.

Soooo... in poor old ETs humble opinion, does 3 inch over 2 3/4 matter?
Well, to a reccy user, no it probably doesn't matter a rats
If I made exhausts and I only had to make 1 size for any GU then that is going to save me heaps and make my margin better or product cheaper
If I made exhausts and can make a system at a different size for a target consumer and it gave me a marketing difference that gets me money then why not.

Why does Nissan use a smaller pipe dia system than that again if it reduces Turbo performance?
Because smaller pipes are quieter, easier to design and route and assist in emmission management albeit not as much as dodgy ECU software.

Thanks for all the feedback and tips. I will proceed with a straight-through 3", most likely from dinkum and will install with help from a few mates :)

mudski, I emailed you through this forum last week about ordering a few things - whats the best way to contact you?

Thanks again - so great to have this forum, as it is such a great resource to have at your finger tips!
:)

cheers

Email is the best mate for point of contact. You wont regret the choice in pipe. Just get on with a high flow cat in it though. Big fines if caught without one.

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Quote:

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Originally Posted by Bigcol

atleast Beaudesert explained why you shouldn't have a 3"

and it is correct 2 3/4" is better for the 3L than the 3"

although, at the price (1800 V's 1600 for the Taipan) was the Taipan quote for the 304 stainless or the mild steel?

if it was 304 stainless, I think I would lean towards the Taipan

get another 15 years out of it (hopefully)

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true to a point the 2.75 is more suited to the CRD,,,,
the Di can handle the 3", but will required a manual boost controller, gauges etc

Quote:

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Originally Posted by threedogs

true to a point the 2.75 is more suited to the CRD,,,,
the Di can handle the 3", but will required a manual boost controller, gauges etc

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I honestly think that is bollocks! Just a marketing ploy to sell more pipes for the newer motors in my opinion. The only difference between the di and crd is the ecu, intake and fuel delivery system. Unless there is an independent dyno run done to prove otherwise, im calling bs. If im wrong, ill be happy say im wrong.

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When will you be looking at getting this and installing it? A new exhaust system is something I may be needing one day soon and would be keen on doing it myself. I'd love to know how hard it is... :)

Will be trying do before xmas - moving at house in the next few weeks so proving to be difficult to lock in some time for this :)

I will definitely report back on how it goes and what the pain points were :)

Hi Wreno,

With your new Dinkum exhaust did you opt for a Large Muffler, Hot Dog (no bun) or no muffler?
I'm looking at it and like the idea of a Hot Dog but not sure.... (and no it not just because i'm hungry!)

Anyone else please feel free to jump in... to Hot Dog or Not to Hot Dog!

Cheers,
T

Quote:

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Originally Posted by qwertytank

Hi Wreno,

With your new Dinkum exhaust did you opt for a Large Muffler, Hot Dog (no bun) or no muffler?
I'm looking at it and like the idea of a Hot Dog but not sure.... (and no it not just because i'm hungry!)

Anyone else please feel free to jump in... to Hot Dog or Not to Hot Dog!

Cheers,
T

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If its a 3ltr. Go no muffler. No doubt 100%. I did with my 3ltr and it was the best thing. More noticeable than having a DP chip.
If its a 4.2. Go no muffler. No doubt 100%. Not so much noticable in performance to my 4.2 as it was putting out 160rwkw with a muffler, but the sound. Oh so sweet! Lol.
As for fitting, if your handing with spanners. Have a crack yourself. The hardest part is the dump pipe. The muffler shroud can be a pain in the butt to remove. You just gotta hold your tounge the right way. The rest is real easy.
If its the 3ltr i would go buy some spare turbo to dump pipe studs and nuts before you do it. Unless you have access to these parts easily enough then dont bother.


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Thanks Mudski,

It is a 3ltr and I'm keen to give it a go myself, thanks for the heads up on dump pipe studs and nuts I'll make sure to have some on hand. :)