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Post by Yarno on May 24, 2004 18:51:46 GMT 11
Hi, Just want to know has anyone done this to the 2.8??
This is what I am thinking 3" dump off the turbo and straight through to one resonater, then out the back.....
Cheers
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Post by Witchdoctor on May 24, 2004 19:51:12 GMT 11
I have 2.5" straight of the turbo, The size was matched to the outlet of the turbo. By over sizing the pipe work on deisels is a complete wast of money that came from a deisel truck specialist. This is on a 3.1 MU & it works great & has a nice growl. Hope this helps Yarno.
Dave
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Post by francesco on May 31, 2004 13:29:21 GMT 11
Hi Yarno.....I have 2.8....when I researched this I was told by many diesel specialists and Exhaust centres that anything more than a 2.5" would be overkill....also that press bent was also all that is needed. This came from someone who has dyno'd quit a few of them.
But who knows??? so many opinions
I went for the 2.5" press ..... finance was an issue for me.
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Post by francesco on May 31, 2004 13:31:53 GMT 11
Yarno....I thought you had a 3.1 ?
Did the intercooler make much difference???
Have you had it Dyno'd at all?
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Post by Yarno on May 31, 2004 16:47:09 GMT 11
She is deffenatly a 2.8
Intercooler only made slight difference as I have not got a scoop for it yet, so there is not much air flowing through.... no dyno yet will do somthing like this when the mods (exhast and scoop) are done, and have the injecters and pump serviced/tuned at the same time.
As for the exhaust....... well at the moment it is cut off just before the muffler so it has no restrictions other than pipe size, and it has made no difference to power, only gives a great sound, so this is why I am thinking big..... I'll proabably just try it anyway.
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Post by Jimmu on Mar 13, 2005 16:37:38 GMT 11
Hey Yarno, Any pics of your top mounted intercooler intall? I am tossing up doing the Front Mount thing or the top mount. Their is alot of piping to do the front mount. Which may cause Lag which is the last thing I want in my 4WD. But it would obviously cool better. Also the bonnet scoop would look cool I think.  Jimmy. |
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Post by maletimaru on Jul 23, 2005 18:19:34 GMT 11
I am looking at 2.5" from dump pipe going into a flowing 4" with 4" tip (muffler) on rear with Turbo it won't be
A- too loud
B- overkill
and
C- will allow better breathing for the turbos and will help to spool the turbo quicker as more heat will be going out the back end!
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Post by geeves on Jul 24, 2005 16:58:12 GMT 11
Your going to have fun finding somwhere for a 4 inch pipe but otherwise good . 2.5 to 3 is plenty .
Also no point having the muffler at the back it will be easily damaged and no room. much better to put a less showy muffler ie coby in the stock location under the back seat.
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Post by maletimaru on Jul 25, 2005 14:42:21 GMT 11
Ah but off comes rear bumper and towbar for fitting the rear muffler - dedicated 4wd you see!!!
Also i am not going all the way to the rear - It is coming out by the rear wing behind the passenger's door before the rear wheel - so long as it is past the compartment then it is legal!!
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Post by geeves on Jul 25, 2005 16:41:49 GMT 11
Where a pipe that size goes under the chassis its going to be quite vunerable. My tubular type steps attach there and are quite squashed. (these are the solid bighorn ones not the fancy chrome mu ones)
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Post by maletimaru on Aug 20, 2005 19:35:08 GMT 11
Geeves
After much consideration and much munting of my fancy chrome mu featherweight side steps i have reconsidered the 4" idea!! lol Instead now just fitting a 2ft coby onto the rear section of the exhaust (gonna cost $100 all up !)
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Post by trikimu on Feb 11, 2007 15:20:17 GMT 11
press bends are a waste of time, whats the point in starting at 2.5" at the turbo and then haveing the diameter reduced to under that at the first bend. Mandrel bends all the way.
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mattmurdoch
Isuzu Junior
when the going gets rough..
Posts: 68
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Post by mattmurdoch on Feb 20, 2007 10:28:46 GMT 11
nothing rong with press bent. it depends on the angle of the bend, and mandrel bend are time consuming and expensive. 2.5" is more than enough as the outlet for the turbo is roughly that size any way any bigger would be a waste of time and effort. well thats my opinion any who. cobys are an awsome muffler replacement even more so in 4x4's as they are free flowing and diesel engines love one thing and thats good flow also they are amazingly sturdy!.
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Post by polcat on May 16, 2007 14:57:36 GMT 11
I am looking at 2.5" from dump pipe going into a flowing 4" with 4" tip (muffler) on rear with Turbo it won't be A- too loud B- overkill and C- will allow better breathing for the turbos and will help to spool the turbo quicker as more heat will be going out the back end! yup agree, anything you can do to get rid of the exhaust quicker will result in quicker spooling and a quicker truck! especially when you increase boost, turbo's are after all a compressor of air, normally running at 9psi upwards. exhaust out do not forget the air in, std air cleaners are sized for the middle ground performance with not a lot of top end, increase boost and or exhaust and the next limiting factor is the surface area of the air filter! can attest that the increased exhaust works more significant than a bigger turbo with no air or exhaust alterations. fitted a ball bearing turbo with increased boost, went ok and not the big change I expected. Added another exhaust leg from the transfer case back, mandrel bend 2.5" and what a difference, (air out achieved) sorted the sir in (extra air cleaner) and now behaves like a multi valve diesel!! My day drive is a Mitsi 3.2 DID and now find the 3.1 better in some areas given I run 32 mud tyres on it and the mitsi is std! |
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Post by mudlark on Aug 7, 2007 20:54:19 GMT 11
Well I finally tuck the plung and opened the welt for the 2.5 system when finished it starts at flixy into 2.5 Y and out just in front of the rear tries on both sides as i alway get to close to the banks one side blocks the other will still work. I will try and get a pit while she is still in the air as i work and live right next door to my engineer. I will be giving it a good test run on the weekend on the CRUNCHY BAR TRAIL over the gum Fields and up some mean sand duns in the Far North so I will let you know how she go's  |
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Post by trooperdeux on Aug 17, 2007 8:01:29 GMT 11
Sorry for a bit of hijacking, but I am now in the Christchurch area and finally bought a nice 1994 Bighorn 3.1. I'm thinking of going the K&N/bigger exhaust route and wanted to solicit opinions on local exhaust shops that do good work?
Also, in general, trusty local mechs that know diesels and aren't full of crap?
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Post by James W on Aug 17, 2007 16:43:03 GMT 11
For pipe bending in chch you are best to use Auto bend, they have computerised pipe benders and will probably have one of file, bend it up for you and simply go pick it up. Saves the hassel of custom fitting one and measuring yours etc.... take the bit's to some other exhaust shop and get them to weld it all up for you.
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Post by mudgrip4 on Aug 20, 2007 13:37:47 GMT 11
Further to James comment, Autobend is where alot of club people go for exhaust systems. Give them a call and ask for boss Robert Craig and tell him Mike Anderson also referred you - he's a Canterbury 4wd clubmate of mine - and ask for club price on your exhaust setup. They link in with a muffler shop and give a good club deal. I think mine for my swb bighorn ex turbo was about $440 fitted incl flexijoint. Other quotes varied up to $750.
Mike
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