Patrol 4.2 Dump pipe & Exhaust

Submitted: Wednesday, Jun 04, 2008 at 22:24
ThreadID: 58392 Views:4022 Replies:10 FollowUps:9
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Has anyone completed the conversion to the larger dump pipe and 3"exhaust on the Patrol 4.2 TD?
Does it really improve fuel economy? Or just provide more power? Usually with more power, comes more fuel usage, but have been told, that this ''conversion'' will actually the fuel economy and provide more power.
Also as an average, what distance are people getting out of their tank(s) of diesel in km range for the 4.2 Patrols?
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Reply By: donk - Wednesday, Jun 04, 2008 at 22:32

Wednesday, Jun 04, 2008 at 22:32
If you look at the Patrol Forum you will find lots of people who have had this done & lots of information on the subject

Regarding fuel consumption our standard 2005 returns around 12L/100 klm (always loaded to gvm)

This is the link to the forum

http://www.patrol4x4.com/forum/index.php

Regards Don
AnswerID: 307805

Follow Up By: Gold 4.2 Patrol - Wednesday, Jun 04, 2008 at 22:42

Wednesday, Jun 04, 2008 at 22:42
Thanks for the links, seems to be some mixed opionions on it though.
You are getting better fuel economy than I. Currently I run on nearly 17L / 100. True I'm running 33"tyres, but of late, really gone down hill. Tappets being adjusted tomorrow for the 100,000K service, so see if I can get to your benchmark.
Thanks again.
Gareth
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Follow Up By: Kumunara (NT) - Thursday, Jun 05, 2008 at 14:43

Thursday, Jun 05, 2008 at 14:43
Gareth


I have a standard 4.2 and get about 12.5 litres / 100 kms. That is sitting on 110 km/h. If I go slower I can improve on that.

When you do mods that increase the power / economy you only see the improvement in economy if you do not change your driving habits. If you use the extra power you will use extra fuel.



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Reply By: Member - Littleborgy (SA) - Wednesday, Jun 04, 2008 at 22:33

Wednesday, Jun 04, 2008 at 22:33
Gold 4.2 Patrol,

In my 4.2 N/A Patrol, i got 1240km's out of a 140L tank on a trip to Mount Gambier & back sitting on 110km/h... We only had 2 adults (both under 100kg), one suitcase & a 50L Waeco fully loaded for the duration though...

Hope this helps,

Cheers, Brad
AnswerID: 307806

Reply By: donk - Wednesday, Jun 04, 2008 at 22:54

Wednesday, Jun 04, 2008 at 22:54
Gareth

My consumption might be a bit better than some because i have 750/16 tyres & because the thing is always loaded to gvm i run fairly high pressures (44 psi front & 60 psi rear on sealed roads)

I know from working in workshops & pushing 4wd's on to 2 post hoists that the ones with wide tyres running at lower pressures take a lot more effort to move than my patrol does & i wonder if this increases rolling resistance & fuel consumption

Regards Don
AnswerID: 307811

Reply By: donk - Wednesday, Jun 04, 2008 at 23:00

Wednesday, Jun 04, 2008 at 23:00
When you say it has gone downhill lately i assume you have checked that your air filter isn't blocked

Regards Don
AnswerID: 307814

Reply By: Gold 4.2 Patrol - Wednesday, Jun 04, 2008 at 23:07

Wednesday, Jun 04, 2008 at 23:07
Its great to chat to someone about this, thankyou. I run my tyres at around 42psi, but only noticed fuel consuption going down hill recently. When I changed to the 33's tyres, I lost 100K per tank off my range straight away. They are still the skinny version of the 33's though, the 285's
Thanks again, you have inspired me now to get my full membership, as heading to Alice in August.
Cheers
Gareth
AnswerID: 307817

Follow Up By: donk - Wednesday, Jun 04, 2008 at 23:17

Wednesday, Jun 04, 2008 at 23:17
There is a lot of information to be found on the patrol forum but like all forums some of it is not correct so try to sort the good stuff from the not so good

Regards Don
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Follow Up By: Member - JohnR (Vic)&Kath - Wednesday, Jun 04, 2008 at 23:23

Wednesday, Jun 04, 2008 at 23:23
You talking actual kms or indicated kms? There is about 6% difference going to 33 inch over 31 inch.

I found better fuel economy with the ute I was driving with a 3" dump pipe and mandrel bent exhaust. The acceleration time to 100kph was better by 16% too.
Cheers,
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John

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Reply By: Grungle - Thursday, Jun 05, 2008 at 07:39

Thursday, Jun 05, 2008 at 07:39
You really can't compare fuel consumption figures as every vehicle is different due to the way it has been setup. Tyres, weight from bars, winches, batteries, roofracks, suspension lifts, tuning of motor etc all impact on a vehicles profile and power to weight ratio.

If you are after better consumption then focus on regular servicings and inspection of filters, look into a free'er flowing exhaust and tune of the air fuel system (boost and fuel pump) and probably fit an EGT gauge to monitor exhaust temps as this is an indication of how hard you are working the engine.

With an EGT gauge you will quickly find the sweetspot at cruising speed when you can acheive a low regular EGT at a given speed. This for me is around 95km/hr actual and indicated speed (my speedo is only out by 1% at 100km/hr).

My 2 cents

Regards
David
AnswerID: 307834

Reply By: Member - Sam (NSW) - Thursday, Jun 05, 2008 at 07:57

Thursday, Jun 05, 2008 at 07:57
I had the mod done earlier this year and couldn't be happier. Fuel economy has improved and power has gone up. Can hold in a gear for a lot longer before having to change, dont have to change at all in some places where before I did.

Mind you, I also had the fuel pump adjusted to suit as well.
AnswerID: 307837

Follow Up By: Ozboc - Thursday, Jun 05, 2008 at 09:32

Thursday, Jun 05, 2008 at 09:32
did it make the sound of the car louder also -- or is it about the same , i for one dont like big noisy diesels - but am considering this conversion

anyone have a $$ figure ( rough )

Boc
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Follow Up By: Member - Sam (NSW) - Thursday, Jun 05, 2008 at 12:16

Thursday, Jun 05, 2008 at 12:16
increase in noise is only slight - i had the Taipan XP system fitted.

the turbo whistle is more noticeable

but overall, not that much louder at all. just deeper and throatier.

not offensive
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Follow Up By: Ozboc - Thursday, Jun 05, 2008 at 12:38

Thursday, Jun 05, 2008 at 12:38
Just need a ball park figure on cost ??? and can i get it done anywhere near Liverpool ( NSW)


thanks
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Follow Up By: Member - Gareth P (VIC) - Thursday, Jun 05, 2008 at 18:34

Thursday, Jun 05, 2008 at 18:34
Thanks for the info, also helps to convinve 'the handbrake''. Keen to know what the cost was for it too? Quoted around the $1000 mark in melbourne, for both dump pipe and 3" exhaust
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Follow Up By: Member - Sam (NSW) - Thursday, Jun 05, 2008 at 20:24

Thursday, Jun 05, 2008 at 20:24
i got mine done at Silverwater Auto Service

cost around $1800 i think all up.

that included the exhaust (incl larger ceramic coated dump pipe), freight of the stuff from Bris. installation, dyno tuning, boost control valve and pump adjustment
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Reply By: Member - John T (NSW) - Thursday, Jun 05, 2008 at 09:48

Thursday, Jun 05, 2008 at 09:48
Morning Gold 4.2 Patrol

I had my 4.2 done about 18 months ago here in Tamworth. Noticable difference in power - lots more - but with a light right foot the fuel coms. is good - about 16.5 l/100 towing my Trak Shak at 95kph. Obviously the harder you drive the more it will use. I now feel like I could use another 1/2 a gear

The exhaust is noiser but not loud - and it has this lovely growl at low rpm.

Highly recommend the modifications

Cheers
John T (Lifetime Member)
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AnswerID: 307853

Reply By: Trevor R (QLD) - Thursday, Jun 05, 2008 at 20:12

Thursday, Jun 05, 2008 at 20:12
Have had it done since new back in 2001 and love it but I had other performance mods done at same time so hard to tell if I would have been happy with just zorst mod????, the $1000 price indicated is pretty good from what I was charged and what other people are being charged that I know, one bloke up here in Brissy is about 660 or 690 for the zorst alone and if I remeber right the dump pipe is about 180???? but if you can deal local for the little bit extra I would, just for convenience.

My addiction to the right loud pedal makes my fuel figures pretty ordinary, plus mine is loaded v.heavy all day every day. Can get 14lt/100km but usually closer to 15+lt/100km. Put the van on the back and up she goes to 19-20lt/100km. Very easy to sit on speed limit even fully loaded (always watching my temps when the van is on though).

Have fun and enjoy this site. There is a heap of other reading in the archives if you wish to take the time looking about modified 4.2 Patrols.

Best regards,
Trevor.
AnswerID: 307966

Reply By: Old Johno [NSW] - Friday, Jun 06, 2008 at 09:18

Friday, Jun 06, 2008 at 09:18
One thing you might look at to improve your fuel usage is have the injectors done. These should be done around 90-100,000km
Good luck
AnswerID: 308070

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