bling Turbo inlet manifolds

[Donor]

Hi there, I was looking at buying this manifold on trademe, for my 4agze turbo

http://www.trademe.co.nz/Trade-Me-Motor ... 674812.htm

why are they better than the 4age ones or do they just look very nice lol. what about the log type ones?

thanks for any input

[bluemaumau]

viewtopic.php?t=52626

[QikStarlie]

depends what it looks like inside,

[Adydas]

Thats not how the concept of "bling" works..

[IH8TEC]

if you want bling, get actiondan who made that one, to make one of his handbeaten ones, that my friend is damn nice. as seen on his old ae101 4agte.

[Donor]

thanks guys,

but I was actually wondering why they are better than the stock n/a ones?, I see on some rb26 manifolds etc they make one end smaller than the other, why is this? are the runner tubes the same length inside the box or differant?

what Im tryning to say is, is there a performance advantage with a tapered off in/mani compared to a stock one

no body Ive asked with them on there cars can really explain to me why they are better, thats why I just thought they are a W@$#k thing

ideas,discussion???

ta

[IH8TEC]

a rough explaination is that is delivers the same amount of air to all cylinders, unlike factory ones which tend to not do this to a degree.

more knowledgeable people can explain it better though

[Crampy]

The larger plenum chamber is needed for a turbo car.
I think the general rule of thumb for plenum size is twice the engine capacity.

[method]

Longer intake runners will increase torque at lower RPM by increasing the air velocity.

[QikStarlie]

big gains if they are made properly, and to suit your engine. big waste of money if not,
theres alot more too it, than a few pipes welded to another big shiny pipe. thats tapered or not.

[JamesM]

just a question. whats the theory behind a longer pipe causing the velocity to increase?

with a manifold that is tappered then the pressure drop increases along it.. so the air is more likely to go down the first chamber then second etc..

or is it in fact the complete opposite.. due to the taper the air velocity increases and thus more air is forced down the furtherest away chamber and so on? i think thats more likely.. but also all the intake valves are not open at the same time.. so it might not make that much difference..

the manifold design is not optiaml anyway.. with having the throttle body perpindicular to the runners.. would be better with splitters for each runner.. or the best is to have individual throttle for each runner.. (quads etc).. this way the same amount of air is taken into each runner.

but with a turbo car i dont think the manifold design would be as crucial as for an NA car.. due to the air being forced into the runners due to pressure rather than beign sucked in. so for a turbo car its more like just a pressurised chamber.

soemthing to think about?

[QikStarlie]

in most cases same applys to turbo as n/a, but yeh not all.
long runners wont increase velocity. helmholz is why runner lenghts effect power at a certen rpm.

[JamesM]

yes i just wanted to get that cleared up re the runner length.. velocity has nothing to do with length

[Akane]

Talk to RedMist?

The answer is Helmholtz!

Red Mist Racing
Bunderson Desert Race Car (336)
Mitsibushi Lancer RS Rally Car
Toyota ST205 Celica GT4 rally (in the build)
www.redmist.co.nz

http://en.wikipedia.org/wiki/Helmholtz_resonance

Applications
Helmholtz resonance finds application in internal combustion engines (see airbox), subwoofers and acoustics. In stringed instruments, such as the guitar and violin, the resonance curve of the instrument has the Helmholtz resonance as one of its peaks, along with other peaks coming from resonances of the vibration of the wood.

[method]

just a question. whats the theory behind a longer pipe causing the velocity to increase?

with a manifold that is tappered then the pressure drop increases along it.. so the air is more likely to go down the first chamber then second etc..

or is it in fact the complete opposite.. due to the taper the air velocity increases and thus more air is forced down the furtherest away chamber and so on? i think thats more likely.. but also all the intake valves are not open at the same time.. so it might not make that much difference..

the manifold design is not optiaml anyway.. with having the throttle body perpindicular to the runners.. would be better with splitters for each runner.. or the best is to have individual throttle for each runner.. (quads etc).. this way the same amount of air is taken into each runner.

but with a turbo car i dont think the manifold design would be as crucial as for an NA car.. due to the air being forced into the runners due to pressure rather than beign sucked in. so for a turbo car its more like just a pressurised chamber.

soemthing to think about?

Forced induction or not the engine still sucks air in, manifold pressure is no where near enough to blow air in. Just on turbo cars there are better mods to do first before doing mods like that.

The idea is so that the cylinder doesnt have to compete for air from the next cyliner, the longer intake runner means there is more air exclusivly for that cylinder and the air is there waiting to go.

Thats the best i can explain it really.

[Caveman]

Does anyone know anything about these tubular intake manifolds as seen on the humble 4efe



I imagine it would work pretty good? It has all the good features, even length, even flow distribution...

[Santa'sBoostinSleigh]

lol looks like a second exhaust manifold! but should work good?

[vvega]

plenum is too small.. make it 2 litres or so and it could well be ok


v

[QikStarlie]

i guy in oz had a turbo 4efe with one of them. then swiched to a standard 4efte one. did a dyno before and after, gained a decent amount of power. cant remember the numbers.. but lost a little bit down low, as you would expect. due to the 4efte's shorter runners.
5efhe acis manifold is the best of the 4e/5e manifolds.

[Dell'Orto]

The Nissan QG18DE has a similar looking intake manifold, with 4 roughly equal length runners. Has a better plenum than the 4EFE one though, but still wouldnt be enough to make big power from.