D22 Navara Exhaust - what are you running?  

the_random_hero

2.5" is plenty big enough. Turbo diesels will never be hugely loud, does it still have the particulate filter fitted?
From memory the dump pipe isn't -super- restrictive on these - but it could also be Rangers/BT50's I'm thinking about.

The.Genocide.General

My mate has a ranger with 3" straight pipes and it's louder than a 4.2 patrol, like crazy loud. Same style as mine but 3" so I'm thinking that's why mines quiet. That or my engines just quieter in general

tatty

If it's anything like my Nav 2.7 TD, the dump is a bit restrictive, because it has a sharp bend immediately after the wastegate. You could attempt to get a new dump made up that is a bit smoother in it's bend (if that is what is causing it?). However I'd be happy it's quiet, you get sick of the droning noise after a while and wish it was silent. And I'd rather spend my money on putting an intercooler on those things.

The.Genocide.General

Yeah I thought that it does look like a bend but it might just be a heat sheild that's bent around it. I'm gonna try a 3" an if that fails to give a nice note im gonna fab up a dump pipe. And yeah half way through a intercooler set up. Waiting for my chip first so I can tune it to suit that and the new exhaust. Cheers for the replys dudes

176OES

The one I am driving is a 3.0L TD and has both that and a full mandrel bent 3" system. Its not much louder than stock either on the exhaust note, but the snorkel really makes a difference on the induction noise.

Its really woken it up down low

MJ80

lol what ? TD's are literally ape shit loud when they are straight pipe, which is what you want. I haven't seen a competition petrol 4wd that is anywhere near as loud and angry as a worked TD. You defiantly have that around the wrong way.

Modern TDs wont really be as apeshit as for example a lc/patrol 4.2 simply because they are much smaller, you should still get a lot of spool and whistle noise though as well as performance gain, unsure as to why you wouldn't be getting it with the 2.5 straight pipe as that size is perfectly matched.

The 3L is the same as in the patrol and they sound plenty meaty and have alot of whistle with straight pipe so id be looking at the dump possibly and seeing what the differences between what you have done and what is done to the trolls are.

the_random_hero

Turbo's are essentially a muffler, they won't be as loud as a NA petrol or diesel. I have done a single 3.5" to twin 3" on a V8 Landcruiser, no mufflers/DPF/etc and it wasn't -that- loud. In fact we rarely bothered putting mufflers on any turbo diesels as they simply don't need it. Yes they are much louder than factory (and you get a faux-flutter through the exhaust), but compared to straight pipes on a NA or petrol equivalent they don't compare.

MJ80

Absolutely not, perhaps when your talking sports cars and high performance NA revvers but in most cases when talking 4wds this is absolutely not the case. I am aware of the tubro having a muffler effect but its really not the case when talking TDs + straight pipe, yes with petrols the turbo makes it alot smoother and quieter, but just not with TDs. You would find the NA petrol would at huge rpm be loud and "tinny" but never as angry or as deep as a diesel. And your getting crossed up with petrol and diesel, diesel v diesel there is absolutely no comparison vs NA and TD, the TD is without question much louder.

For example, i have downstairs right now a 4.2 NA landcruiser with a 3" mandrel bent exhaust with straight pipes i also have a 4.2 TD with 2.5" straight pipes. I can tell you right now that the TD is about 5x as loud in every single area of the RMP range, and the Na is absolutely no were near the level of noise of the TD. Your crossing up petrol and diesel in your comparison, NA petrol can be louder than a TD, but a NA diesel is not louder than its turbo equiv and you certainly could make a TD louder than the NA petrol if you really wanted too.

tatty

Take a picture, I'd be interested to see how the 3l dump looks like.

But I honestly wouldn't do a 3". It's too big, you need that little bit of back pressure. 2.5 is pretty much perfect.

Do you need to tune the 3l's? I thought they were still primitive enough to just bolt them on and hope for the best, with a boost controller it should be fine.

The.Genocide.General

will do when or if i decide its needed. will be trying 3 first,

im pretty sure the less back pressure the better. and the turbo i self gives the engine all the back pressure it needs?

and as for tuning its more so i want to sort out the exhaust and intake before i wack a chip on it, along with a boost controller. so i can set it on a psi that works well

tatty

IMVHO, a 3" seems like a bit of a waste. There are no benefits from it, as 2.5 is pretty much as big as you need. And those turbo's aren't very big at all, so you don't need a mammoth exhaust. My 2.7 used to use a t2, which was about the size of my pinky. I have a t25 off a sr20 on it now, but I wouldn't go anything bigger. The exhaust piping is fine I recon.

As for setting a PSI, it probably runs about 8psi stock. With intercooler and any other intake mods, I'd crank it up to about 12-13psi. Remember it's a diesel, they only take as much as they need, they can't run lean. Plus, they don't rev to 8 or 9g, they redline at about 5g. That isn't enough to go anything higher. Anything more is trying to force air into a steel bottle of water, it just won't go in there. Maybe set it at 12psi, wind the fuel pressure up a bit (if it still works like that) and that's about it.

The.Genocide.General

lol mate thanks for the advice, but stock it runs 15 psi all day lol. once i put the cooler and chip on im going to try for 18-20 psi. thats if the chip itself isnt enough for me, which most people that know what they are on about are saying it should be

tatty

My experience is from the older, mechanical diesels, with the TD series. All I know about the ZD series is that they're a piece of crap engine that decides to melt down, and I'm a bit more familiar with the Patrols, rather than the Nav's. However, you're right, it is 1bar, I just had a look through the workshop manual.

Have you done the butterfly EGR mod yet? With exhaust, butterfly, cooler and the AFM install, you could probably avoid a chip.

Robby

i've just bought one, and keen to see ppls experiences... exhaust/chip/tmic etc

tatty

Get to the Nav forums (www.navara.asia) that'll give you a bucket load of info.

dunsy

hey my brother had a D22 with 3'' exhaust including new dump pipe, no mufflers and it was crazy loud. very tinny sounding
and massive turbo whistle. Drone heaps on the highway too.
He ended up putting a small resonator on it to quiet it down but its still pretty loud.
If yours still has the cat in the dump pipe it will quieten it down heaps. Get rid of it if you want it to be loud.
My Patrol has the same ZD30 motor and i just put a 3'' exhaust with hi flow cat and 1 muffler and i can barely tell the
difference from stock ( in sound ), but i dont want to hear it really, just wanted the performance benefits.