Exhaust set up in an 80

Post by **DX80** » Mon Oct 20, 2003 8:08 pm

What sort of exhaust set up have people got in their 80's? Looking to do something regarding mine in the next week or so. Can you notice the difference with a mandrel bent system?

Post by **Kev80** » Mon Oct 20, 2003 9:15 pm

Petrol or diesel ?

I have a 2 1/2" mandrel bent exhaust with no mufler.

Also a mate has a 4.2L Patrol with 3" mandrel bent exhaust with no muffler but thinks 2 1/2" is all thats needed.

With a turbo you don't need a muffler as much so you get a nice note.

I never drove mine with standard exhaust but am told the factory exhaust pipe is crushed restricting the flow in some places.

Post by **DX80** » Tue Oct 21, 2003 5:44 am

Yeh, she's a diesel. That's half my reason for getting dome new exhaust work done. You are correct, the factory pipe is squashed in some areas.

Post by **dow50r** » Tue Oct 21, 2003 5:59 pm

DX you will notice an improvement getting a new muffler more than a new system, over the rear xmember is squashed, so a new rear aswell.
If you are looking for a good value for money imporovement, get a turbo for it, either preloved or new, depending on how good you are with mechanical things.
Andrew
ps yes to your pm

Post by **DX80** » Tue Oct 21, 2003 6:22 pm

Yeh got no dramas with mechanicals, just wanna get what should be a good diesel going just a bit better. Options open if you here of a good rebuilt second hand turbs.

Post by **80diesel4play** » Wed Oct 22, 2003 3:50 pm

Take the standard exhaust off at the flex - get a non mandrel 2.5" straight through and make sure they dump it next to the spare tyre - no more bends! (not over/under teh rail again under teh rear 1/4) Get a high flow stub Muffler and away you go. all up I spent $250 and love the note, the punch you get.

I do not advice a mufflerless setup unless you have the turbo - I did it for 2 weeks and well - I was very, very very loud - 120+ decibels... Set car alarms off in S/C's.... went deaaf etc - could only drive at 80 or 120....

maybe open the pump a tweak on a dyno once its done to make sure you have the go factor. :armsup:

Post by **DX80** » Sat Oct 25, 2003 6:22 am

So the new system went in yesterday. A non mandrel bent 2.5" with a hi flow muffler, cut from infront of the old resinator. Got a real sweet throaty note to it now and can notice a little difference going through the gears. So my question now is, has anyone got extractors as well, and is there a more noticeable boost with a set, or bugger the extractors and work towards a turbo? The shop put this 3" chrome tip on the end which I'm not so sure about, looks like a bit of a wank, didn't pay for it, they recon the gave it to me for nothing, so might do away with that.

Post by **DX80** » Sat Oct 25, 2003 8:17 am

Chrome tip is now gone. Couldn't stand looking at it. It looked like Julio the street racer.

Post by **Kev80** » Sun Oct 26, 2003 1:56 pm

Chrome tips apparently rust the exhaust pipe so stainless steel should be used instead but personaly don't think there needed on a 4by.

I you don't intend on going for the turbo id defenatly go for the extractors, the 1hz has a very basic cast exhaust manifold that looks like a big restriction.

BTW- did you keep the exhaust flex joint near the engine ?

Post by **DX80** » Sun Oct 26, 2003 3:23 pm

Yep, kept the exhaust flex joint.

Post by **80diesel4play** » Mon Oct 27, 2003 11:57 am

My housemate has a set of extractors on his 80 - makes a difference as it picks up the bottom end grunt and makes long hills easy as - it essentially brings the backpressure back to the engine so it has more torque as well as freeing up the the top end. Worth getting - its on my shopping list next as well. :cool:

Replace the flexi when you do the extractors. Worth the extra $150.00...

Post by **Kev80** » Mon Oct 27, 2003 7:01 pm

80diesel4play wrote: it essentially brings the backpressure back to the engine so it has more torque as well as freeing up the the top end.

I thought extractors reduced backpressure ?

If you have tuned length extractors the exhaused from each cylinder theoretical sucks the gasses from the other cylinders that are in the combustion stroke allowing less backpressure on the engine, this is called "scavenging"

Well thats how i think it works anyway ! :roll:

Post by **80diesel4play** » Wed Oct 29, 2003 12:21 pm

I mis quotyed myself - scavenging is the correct term- after the high flow exhaust moves the back pressure point further down the piping... The extractors assist - one thing with scavenging - they will pull oil up into the exhaust - so a good dyno tune would be advisable...

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Exhaust set up in an 80

Exhaust set up in an 80

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