Fitting extractors and large exhaust systems to Diesels

Submitted: Thursday, Jan 09, 2003 at 13:12
ThreadID: 2873 Views:4082 Replies:9 FollowUps:2
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Does anyone have experience of fitting extractors and a larger (2.5 or 3 inch) exhaust systems to turbo charged diesel 4WDs?

I've been told that this can dramatically increase performance. What are the pros and cons and what kind of performance enhancement can I expect?

I have a GU Patrol 4.2TD.

Many thanks in advance.
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Reply By: Truckster - Thursday, Jan 09, 2003 at 13:43

Thursday, Jan 09, 2003 at 13:43
This is like toyota V Nissan, Diesel V Petrol

Some people say it makes a difference.. Some say it doesnt.

I got a 2.5 system with my Turbo when I got it, so would be able to tell, but prior to the turbo went extractors and larger system it made NO difference really..

Mate on patrol list went 3in on his GU 3,0 and Swears by it now..
AnswerID: 10911

Reply By: fatboy - Thursday, Jan 09, 2003 at 17:21

Thursday, Jan 09, 2003 at 17:21
I helped a mate at work put a turbo on his 1Hz 75 series and he ran it with the standard system until he could afford a 2.5 inch mandrel bent system . The performance was like chalk and cheese. He is sorry he didn't go to 3 inch now . only draw back is it is slightly louder than standard. It is now obvious why semi trailers use such large exhausts.
AnswerID: 10919

Follow Up By: Truckster - Thursday, Jan 09, 2003 at 17:24

Thursday, Jan 09, 2003 at 17:24
The other thing is you can actually go TOO big for the turbo and motor and decrease performance.

3inch should rock on a 1HZ Toy motor!
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FollowupID: 5896

Reply By: colin - Thursday, Jan 09, 2003 at 18:01

Thursday, Jan 09, 2003 at 18:01
fitted a 2.5 system to my GQ 4.2 diesal non turbo and noticed a differenc in performance and economy, dont fit a straight through muffler as they are to noisey, i fitted a v8 ford stainless muffler, works fine. I also fitted finer filters and noticed more improvements. Col.
AnswerID: 10923

Reply By: OziExplorer - Thursday, Jan 09, 2003 at 19:41

Thursday, Jan 09, 2003 at 19:41
Diesels normally don't have enough volume or speed of gas to require a larger exhaust system or extractors from the original. Unfortunalty there are no before or after dyno figures to back up all that say they have these enourmous gains in power and fuel economy.
Most of what they say is to convince themselves because they have spent buckets of unecessary money on getting the job done. It is unlikely you could actually notice any difference after fitting all this gear. Dyno figures would be the only way to show if there is any difference.
AnswerID: 10931

Reply By: bruce.h - Thursday, Jan 09, 2003 at 20:33

Thursday, Jan 09, 2003 at 20:33
DONT KNOW ABOUT TURBO DEISELS but had one fitted to both my hj 75 & nissan 4.2 gq deseils i found it work a lot better the down side of 2.5 through turbo muffler is that it is a lot noisier i agree with truckster you can go to big & have a negitive affect,its like fitting any extras person chiose based on what you can afford but i dont think you would be disapionted regards Bruce
AnswerID: 10940

Reply By: bruce.h - Thursday, Jan 09, 2003 at 20:33

Thursday, Jan 09, 2003 at 20:33
DONT KNOW ABOUT TURBO DEISELS but had one fitted to both my hj 75 & nissan 4.2 gq deseils i found it work a lot better the down side of 2.5 through turbo muffler is that it is a lot noisier i agree with truckster you can go to big & have a negitive affect,its like fitting any extras person chiose based on what you can afford but i dont think you would be disapionted regards Bruce
AnswerID: 10941

Reply By: Glen - Thursday, Jan 09, 2003 at 23:19

Thursday, Jan 09, 2003 at 23:19
Piers,
A larger exhaust system from a turbo can also allow the hot gases to vent faster from the turbo keeping the overall temperture of the motor lower. Have a 100 series and fitted aftermarket turbo and then had a custom 3 inch mandral bent exhaust system fitted . Drove the car before and after the system was fitted and there is quite a remarkable differance. Also the temperature at the turbo dropped allowing an increase in boost pressure after fittment. A larger system does not have to mean larger noise and a good exhaust centre should be able to fit a suitable muffler to reduce noise without reducing performance. Remember diesels are not racing motors but if your are looking to increase performance, exhaust mods are one of the opitions along with many others.
AnswerID: 10966

Reply By: max_rockatansky - Friday, Jan 10, 2003 at 21:51

Friday, Jan 10, 2003 at 21:51
a 3" mandrel on a 4.2 TD patrol is perfect..., you wont even need a muffler


max
AnswerID: 11031

Follow Up By: Max_rockatansky - Friday, Jan 10, 2003 at 22:24

Friday, Jan 10, 2003 at 22:24
shouldn't have said about the no muffler thing

it looks like oziexplorer will dob me into the govt for polution or something like that
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FollowupID: 6016

Reply By: patrol692001 - Sunday, Jan 12, 2003 at 21:21

Sunday, Jan 12, 2003 at 21:21
piers ,
Ive a 4.2 non turbo GQ Patrol with a 2.5 " ex & extractors .Worth every cent ($700). Increase in power & approx 2mpg around town. Wish id done it sooner.


CHEERS MIKE
AnswerID: 11147

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