What Size exhaust Niss 3.0TD

Submitted: Tuesday, Jan 11, 2005 at 18:28
ThreadID: 19269 Views:2071 Replies:9 FollowUps:7
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Looking for advice on what would be the best (for optimum performance )aftermarket size exhaust and muffler type to suit Nissan GU 3.0TD ie; 2 1/2" .
2 3/4" or 3", futhermore would your recommendations need to change if I installed a unichip at a later date ?
Regards
Shep
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Reply By: Truckster (Vic) - Tuesday, Jan 11, 2005 at 22:34

Tuesday, Jan 11, 2005 at 22:34
3inch.
and add a Dtronic at same time.
AnswerID: 92539

Reply By: Leroy - Tuesday, Jan 11, 2005 at 22:43

Tuesday, Jan 11, 2005 at 22:43
An interesting read. d tronic and 3" exhaust review

Leroy

AnswerID: 92544

Follow Up By: Shep - Saturday, Jan 15, 2005 at 08:35

Saturday, Jan 15, 2005 at 08:35
Thanks Leroy
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FollowupID: 352142

Reply By: Bonz (Vic) - Tuesday, Jan 11, 2005 at 23:39

Tuesday, Jan 11, 2005 at 23:39
mmm looks like the 3inch is the go, I am consdiering doing this, whats the cost for a 3"mandrel bent jobbie for the 3.0GU??
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AnswerID: 92557

Reply By: Member - muzzgit - Tuesday, Jan 11, 2005 at 23:40

Tuesday, Jan 11, 2005 at 23:40
I've just been to that link. That's all very well and good, but if I fit a DTronic to my 3.0 patrol, could the guys at safari tell me how long it will be before my motor goes KABANG!!

And if it does, is Nissan going to want to know me when my car turns up on the back of a truck?

Cheers,

Muzz
AnswerID: 92558

Follow Up By: rig pig - Wednesday, Jan 12, 2005 at 03:01

Wednesday, Jan 12, 2005 at 03:01
3.0td without Dtonic, any time. 3.0td with Dtonic any time soon !
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Follow Up By: Happy GU Owner - Wednesday, Jan 12, 2005 at 16:34

Wednesday, Jan 12, 2005 at 16:34
Muzz,

Don't worry about the Dtronic, I have done over 100,000 klms with one fitted and have had no problems at all.

Checked with Safari at time of release, and they assured me that power gains were made with safery margins in place (i.e they could have dialed in more power if required), and the factory ECU safety features are not overriden by the Dtronic, the Dtronic will in fact decrease power gains in line with ECU if ECU dictates.

Mic
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FollowupID: 351533

Follow Up By: Shep - Saturday, Jan 15, 2005 at 09:13

Saturday, Jan 15, 2005 at 09:13
Mic, Andrew
This seems like a logical and cost affective idea as my pipework is still in good condition, the question now is a full free flow or semi flow, I believe the is a need to have some back pressure for the motor ? I like to do plenty of homework before committing . thanks for your input.
Please keep us in the loop if either of you go ahead with this mod.
Regards
Shep
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FollowupID: 352152

Reply By: Happy GU Owner - Wednesday, Jan 12, 2005 at 13:34

Wednesday, Jan 12, 2005 at 13:34
Shep,

I am looking at this at the moment and have most likely decided, with the help of the performance exhaust man, to just replace the llaarrggee muffler next to the tailshaft with a straight thru 2 1/2 inch sports muffler, leaving the original resonator and pipework. This can be done for around $200, and then if it doesn't work as planned, will allow for a complete exhaust system change using the new sports muffler just purchased.
According to the specialist, it is the main muffler that causes all the restriction in the system, and de-restricting this will bring all the benefits that come with a free flowing exhaust. Replacing the pipe itself with a slightly larger size pipe would most probably add 1/2 a kw in extra power.

$200 for new muffler fitted
$800 for complete exhaust fitted

The only remaining question - $600 for 1/2 a kw - do I bother?

Mic
AnswerID: 92634

Follow Up By: Member - Andrew(WA) - Thursday, Jan 13, 2005 at 16:00

Thursday, Jan 13, 2005 at 16:00
Happy GU

Please us know your decission and outcome. Would be intersted to hear any performance positives replacing the rear large muffler.

cheers
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FollowupID: 351738

Reply By: Leroy - Wednesday, Jan 12, 2005 at 14:19

Wednesday, Jan 12, 2005 at 14:19
Wasn't the drop pipe from the turbo more restricive on the 3.0 or was that on the 4.2? I remeber a post where someone mentioned they changed the drop pipe and this made the most difference.

Leroy
AnswerID: 92643

Follow Up By: Happy GU Owner - Wednesday, Jan 12, 2005 at 16:28

Wednesday, Jan 12, 2005 at 16:28
Leroy,

It probably is restrictive, as there is the catalytic converter mounted directly beneath the turbo, but as far as I am aware, you need to keep the cat. in place for legal reasons.

Firstly, I dont know if you could fit another one in the space that is there, secondly, the original one is heat shrouded, which is there for obvious reasons, and thirdly the cost of a new cat. that is both free flowing and fits the location with heat shrouding in place, would be quite high.

I am doing further research on this at the moment, but for the next two weeks am tied to the office as I am the only one there, and cant speak to any other exhaust specialists - I am trying to find ones who have actually done a system.

Mic
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FollowupID: 351529

Follow Up By: Wayne (NSW) - Wednesday, Jan 12, 2005 at 21:23

Wednesday, Jan 12, 2005 at 21:23
Mic,

Diesel motors don't have catalytic converters, only petrol motors. One of the reasons that farmers have diesel is that they don't have a red hot cat con sitting under the vehicle setting fire to the long grass.

Wayne
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FollowupID: 351575

Reply By: dano01 - Wednesday, Jan 12, 2005 at 19:45

Wednesday, Jan 12, 2005 at 19:45
I got rid of everything fatory and put on a free flowing muffler yes it made a difference then added a snorkle a bit more on tap and then a uni filter still some more there. So with doing this i got a bit more power and is a bit better on fuel too. How much more do you out of a 4 cyl diesel. Also be carefull the 3.0l has a nasy habit with #4 piston grabbing dont push it to hard.
AnswerID: 92702

Reply By: Wayne (NSW) - Wednesday, Jan 12, 2005 at 21:28

Wednesday, Jan 12, 2005 at 21:28
Shep,

The 80 series went a Nissan when I got rid of all the mufflers and had a 2 1/2' systen put through. Had the pipe as straight as possible and that made a big difference to low down torque.

I only said that it went like a Nissan to make you feel good, but it had enough grunt to pull the bend out of a river.

Wayne
AnswerID: 92713

Reply By: Member - Bob K (QLD) - Thursday, Jan 13, 2005 at 15:00

Thursday, Jan 13, 2005 at 15:00
Shep, I was going to go down the same road and spoke with Motsons in Brisbane as they have done a lot of work with 4.2l and 3.0l engines. Advice from them was that there was no real gain in fitting a larger exhuast.
I was looking mainly at trying to reduce the exhaust temperature. I would be interested in hearing from anyone who has actual dyno figures on the benefits of fitting larger exhausts to 3.0l Patrols.
AnswerID: 92819

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