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Dual Exhaust

htial

By htial,
in Engines & Forced Induction

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htial Grand Master

htial

Posted
Posted

Coming from a V8 family, and also owning a HQ Panel Van running a 308, all of our cars have two pipes out the back.

I'm looking at this as more a visual thing, but what would be the performance Pros and Cons of a Dual Exhaust on a Skyline. I'd be looking at going from the extractors back, putting three cylinders down one side and three down the other.

Thanks for your help and opinions...

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SECURITY Grand Master

SECURITY

Posted
Posted

you'll just be adding more weight for no reason mate.

i think the v8's join in the middle (manifold on each side of the V setup) then split in the end (someone correct me if im wrong).

but our straight 6's have the manifold on 1 side so you wont really gain anything (but weight) from doing this.

plus the other side of the rear where you'd be running the extra muffler doesnt have that recess to fit it, so it'll be hanging pretty low.

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Turbo Dave Collaborator

Turbo Dave

Posted
Posted (edited)

Most V8's do have a full Twin Exhaust, but on a skyline I think it would be a waste of time and weight.

If you want it just for the looks just split into a T-piece at the back and have 2 pipes just at the back.

This is a Late Model Monaro...Full Twin.

2004_gto_exhaust_1.jpg

They also use this method where they have joiners in 1 or more places, something to do with equalisation of airflow or something, not entirly sure. But still a full twin non the less

exhaust_holden_ls1_monaro2.jpg

Edited by Turbo Dave
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htial Grand Master

htial

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Posted
you'll just be adding more weight for no reason mate.

i think the v8's join in the middle (manifold on each side of the V setup) then split in the end (someone correct me if im wrong).

but our straight 6's have the manifold on 1 side so you wont really gain anything (but weight) from doing this.

plus the other side of the rear where you'd be running the extra muffler doesnt have that recess to fit it, so it'll be hanging pretty low.

I hadn't really thought about the weight issue... ...Thanks for bringing that up...

My HQ doesn't join. Keeps four on one side and four on the other. The Comedydor does the same. The Ford has a pipe joining the two half way down, but we don't know if it lets any flow between the two sides...

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htial Grand Master

htial

Posted
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Posted
Most V8's do have a full Twin Exhaust, but on a skyline I think it would be a waste of time and weight.

If you want it just for the looks just split into a T-piece at the back and have 2 pipes just at the back.

This is a Late Model Monaro...Full Twin.

They also use this method where they have joiners in 1 or more places, something to do with equalisation of airflow or something, not entirly sure. But still a full twin non the less

Thanks for sugesting the T-piece.

The Ford has a join piece, but we don't know if it lets air flow between the two. It might, but it doesn't look like it.

Whould you happen to know what 300ZXs run? It it a T-piece or Dual Exhaust?

Thanks...

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Haysey Grand Master

Haysey

Posted
Posted

lol @ thread

300zxs are V6 so hence twin turbo or not they run seperate exhausts... to the back

your r33gtst dosent have extractors nor could run seperate exhaust from the manifold back unless you twin turboed it...

have you looked in your engine bay? it goes Exhaust MANIFOLD through the TURBO then DUMP PIPE then FRONT PIPE then CAT Then Rest of Exhaust....

if you were to have a dual one it would only be for looks and a bit difficult on a skyline as the petrol tank is kind of in the way...

if you really want dual go something like this

apex_n1dual_cat.jpg

looks much tougher.. imo

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pixel8r Mentor

pixel8r

Posted
Posted

I could be wrong here but I believe there is one big reason to go 2 exhausts at the back.

With two pipes out the back (split after the cat), you get the same amount of airflow but with smaller pipes therefore less noise.

It makes sense for those who want power without exhaust drone.

I'm not 100% sure how much quieter 2 pipes are than 1 though...

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Cubes Grand Master

Cubes

Posted
Posted

Twins are quieter; flow extremely well vs the noise they produce and often than not drove MUCH less if nothing at all.

Twins FTW if you can fork out for a twin 2.25-2.5" system.

Its the same on the old V8's; twins are quieter than the big singles. Owning v8's in the past its always been the case.

The big single on the V8's personally I think sound better.

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SysLink67 Experienced

SysLink67

Posted
Posted

I just recently put a full dual exhaust system on my car. Its the full race spec Kakimoto racing Full Mega N1. 75mm each pipe from each turbo all the way back. No cat factor.

I can certainly say there's no drone anymore just pure "race crackle" if that makes sense with each gear change esp after 3000 rpm. I havent put it on a dyno, but what I have noticed is the turbo response seems to be much more punchier and revs much faster. Also love the Kakimoto quality stainless steel all the way through, that much nickle content a magnet can't even stick to the pipes.

No trouble from fun cops as of yet, though I drive pretty sedate unless a wrxy boy or a commonwhore comes along.

These are Mine, which are now discontinued http://www.nengun.com/kakimoto-racing/full-mega-n1-full-dual

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htial Grand Master

htial

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Posted
lol @ thread

300zxs are V6 so hence twin turbo or not they run seperate exhausts... to the back

your r33gtst dosent have extractors nor could run seperate exhaust from the manifold back unless you twin turboed it...

have you looked in your engine bay? it goes Exhaust MANIFOLD through the TURBO then DUMP PIPE then FRONT PIPE then CAT Then Rest of Exhaust....

if you were to have a dual one it would only be for looks and a bit difficult on a skyline as the petrol tank is kind of in the way...

if you really want dual go something like this

apex_n1dual_cat.jpg

looks much tougher.. imo

Never really had anything to do with 300ZXs, so never really had any idea whats in them.

All cars have "extractors". It all depends on whether you call them "headers", "extractors" or "eshaust manifolds". Putting in the second turbo has crossed my mind. But think I'm going up in costs and power that I'm not really after. I still have to drive it every day for work.

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