Exhaust upgrades ?

Submitted: Tuesday, Apr 23, 2013 at 23:24
ThreadID: 101839 Views:1865 Replies:6 FollowUps:3
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Hi all I am considering a change of exhaust on my Navara 2.5 ltr Diesel
Have been advised to go for a 2.5 inch with no mufflers back from the cat , not sure if this will be too loud . Looking for fuel economy and a bit more power, is this a worthwhile option or not ?
Cheers
Dougboy
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Reply By: KevinE - Wednesday, Apr 24, 2013 at 09:09

Wednesday, Apr 24, 2013 at 09:09
G'day mate,

I'd try looking here: Navara forum

Cheers,

Kevin........ :)
AnswerID: 509647

Follow Up By: Dough Boy - Wednesday, Apr 24, 2013 at 11:21

Wednesday, Apr 24, 2013 at 11:21
Thanks Kevin
will have a look
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Reply By: Steve M1 (NSW) - Wednesday, Apr 24, 2013 at 17:42

Wednesday, Apr 24, 2013 at 17:42
Not a direct reply but I wonder if a bigger exhaust is universally beneficial ? I have a 2008 Prado and have been told by two people at separate times from Dieselcare that any performance improvement would be negligible. I already have a Steinbauer chip. Have locked on Pradopoint and a lot of them have big exhausts but seems a bit vague/inconclusive ?
AnswerID: 509676

Follow Up By: Dough Boy - Wednesday, Apr 24, 2013 at 19:35

Wednesday, Apr 24, 2013 at 19:35
Gday Steve
Thanks for the feedback. all the research I have done tells me that a chip will give better performance but with a larger exhaust the combination creates a lot of difference
thats the way I am thinking of going and wanted to start with the exhaust.
Cheers
DB
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Reply By: Villatranquilla - Wednesday, Apr 24, 2013 at 18:36

Wednesday, Apr 24, 2013 at 18:36
I have a 3lt Navara and put a bigger exhaust and snorkel- max size was 2 3/4 inch - with a mandrell bend.
Increased torque and power by 16% - fuel consumption remained the same - cost about $2700 3 years ago
AnswerID: 509683

Reply By: Greenleader 13 - Wednesday, Apr 24, 2013 at 21:23

Wednesday, Apr 24, 2013 at 21:23
Dougie

interesting post Doug i'm considering an exhaust for my black Prado i,ve recently purchased and have be told it will increase power about 10% and minor fuel economy, will watch further postings
thanks and good drinking

AnswerID: 509697

Follow Up By: Dough Boy - Wednesday, Apr 24, 2013 at 22:09

Wednesday, Apr 24, 2013 at 22:09
Hello Greenleaper
Thought I May hear from you
Will you put a chip with your Prado as well as an exhaust or just go with fries .
Mite see you in the desert this year will look out for you paddling your own canoe

Cheers & Beers
DB
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Reply By: Mountain Goat - Thursday, Apr 25, 2013 at 21:15

Thursday, Apr 25, 2013 at 21:15
With any turbo'd engine, the less restriction in the exhaust, the better.
For your 2.5L, a 2 1/2" or 3" turbo-back exhaust will be a good thing.
As for no mufflers... just make sure you dont get droning in the cabin. You can have a large, free-flowing exhaust with mufflers.... just go for an inline, straight thru muffler and/or a hotdog type resonator to stop it droning in the cabin.
As for fuel economy and power benefits, most newer ECUs have a "fuzzy logic" that will allow a little power increase with a free-flowing exhaust, but to get the most out of it, having the ECU adjusted to suit on a dyno (or to a lesser extent buy an off-the-shelf generic "power" chip) is without doubt the best option if money allows.
AnswerID: 509786

Reply By: 4X4Treker - Saturday, Apr 27, 2013 at 22:30

Saturday, Apr 27, 2013 at 22:30
I am running a 3 inch exhaust on my 3litre Patrol with a 3 inch dump pipe and a 100 cell high flow cat straight after the dump with two high flow resonators one in the middle and one tithe back and the difference was incredible with a 200 degree decrease in exhaust gas temp and a good increase in power but more importantly let's the motor breathe easier therefore better fuel consumption, win all round, if you are thinking of leaving the original dump that has the cat on it you would be wasting your time and money go full system turbo to rear and you will not be sorry
Cheers
Treker
AnswerID: 509920

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