4.2TD Exhaust upgrade

They sure do still have the capstan-type benders and they're okay for your normal, run-o-the-mill hack car too.

The Mandrel-bent type is not a complete exhaust system, but rather a jigsaw type affair whereby the bloke at the exhaust shop will have to order in the correct number of 90o, 45o bends etc to make up the system for YOUR vehicle.

Of course if you buy an off-the-shelf type that you see advertised by some manufacturers, I'm guessing they already have all the bits they need ;-))

Cheers

Roachie

How do you achieve a venturi effect when the gas is being compressed through a narrow pipe into lower pressure. Does not compute. The only thing it can achieve is back pressure which is what you are trying to avoid.
Check the archives, there would be more than a few disagree that had to retrofit the 3" dump.

fink yur zorst dude knows nuffin bout Nissan dump pipes

dont shoot the messenger, i had a wrx and went the full 3" system including dump, i was just relaying what he said. and as for not knowing about nissan dump pipes, read my post "he made the exhausts for the GTR's" as in skylin GTR, as in NISSAN skyline gtr twin turbo. you know, the gtr's that totally dominated the australian touring car events until they were kicked out for being too fast and no one could beat them. which were then replaced by the sierra's which were subsequently banned for the same reason, (aussie V8's couldnt match them) so maby the diesels are different, but im sure he knows about nissan dumppipes!

The post was in relation to GU 4.2TD Nissan. A different beast to your post. I see where you are coming from. Back pressure is important, but 3" is more than suitable for 4.2TD and is only effective with 3" dump.

No offence meant

PK

S&N I reckon your guy had never seen the GU dump pipe mate. They are difficult to blow through. Well nearly. Just over 1.3 the capacity of a 3" one.

I'd like a WRX mate;-) Nice 4by feeling. LOL

That was suposed to be 1/3 or one third the capacity.............

what he was sayin is go a bigger dump, but not as big as the system. so if its a 3" system, go a 2 1/2 dump. if u want i can post his ph number and you can chat with him about it

I already have the 3" full system and it works fine. 84kw at rear wheels according to dyno.

Just picked up the Patrol after having the exhuast fitted. Sounds no louder than the OEM, but a bit of a lower note. You can definately hear the turbo sing (sounds like a rice-burner) and from 60kph up it boogies really quick. Haven't attacked a hill yet or had it above 80 but I reckon it's a different beast now....money well spent (and only $165 to fit, including having inside of the dump pipe polished up as it had a few dags in it).

You got one key word there gqpat. It is the word "may" in the last sentence. The word from the manufacturers is that the power is no different with or without the restriction of the muffler.

Have no fear there is "some" back pressure. I do wonder what you mean in your definitive first sentence. We are actually wanting to make the turbo spin freely and have little back pressure. It isn't some mild V8 but a heavy diesel that needs freedom to pass gasses away - after the turbo.

gqpat, I reckon the restricting factors now are the small turbo and the small restrictive intercooler, that slows the velocity from the turbo. Like to play with those ;-)

If your looking for a different turbo, dude I bought my snorkel off (huddy) is into comps, and mentioned a nice turbo upgrade - which has oodles of power from 1000 up to 4500.. the turbo alone is $2000 then pump mods, injectors etc..

See Awill4x4 if you want an Intercooler. His custom work is second to bleep all.. Welding is show quality, and the intercoolers will give you that twinge that Viagra failed to do...

YMMV