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Herrod Cai


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  • Member For: 12y 9m 20d
  • Gender: Male
  • Location: Brisbane

I personally don't believe that I would get any greater benefit from an aftermarket CAI system. Further, all I have done is cut the lower section of the airbox, so I only need to obtain a new lower section if I wish to take back to standard. Cheers

Might as well go this way and see for myself. Worst comes to worst I can always pull the whole thing out and then put a aftermarket one in later on.

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  • 2 weeks later...
  • Member
  • Member For: 12y 9m 23d
  • Gender: Male

mate growler and big mouth cold air induction kit..take the sickers off and it looks factory mate..

IMO the cross over is a better option, turbo side intake? the hot side of the engine?..that's not cold air

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  • Member For: 12y 9m 23d
  • Gender: Male

mate the exhaust manifold and the turbo are the hottest components on an engine

turbo side - hot air short distance for it to travel

crossover - cold air longer distance to travel

cold air is dense which means more of it...a turbo engine doesnt need it to travel a short distance (although it helps of coarse it does) but being a turbo its actully creating that sucking of air from the shaft spinning due to the exhaust gas..

I know you're big power houses incorporate a short distance air filter or no filter at all (open housing) but look at the size of those turbos..they're huge lag would be a massive issue so the short distance that air has travel would be alot more effective in that case..this bloke said his looking for basic upgrades I think a crossover CAI would be good for him

im speaking in the terms of FG IMO I dont know what side the airbox is factory on a BA I dont have a BA hence..I dont really care

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  • Moar Powar Babeh
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  • Member For: 19y 2m 3d
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  • Location: Perth

mate the exhaust manifold and the turbo are the hottest components on an engine

turbo side - hot air short distance for it to travel

crossover - cold air longer distance to travel

New to turbo cars mate?

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  • Member For: 12y 9m 23d
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New to turbo cars mate?

ok FG turbo

grwoler CAI and big mouth which sucks cold air from the grille.

located on the FG is the intake manifold hence being HOTTER than the other side which is the turbo side being the HOTTER side

a turbo side intake is much hotter but travels a shorter distance..mate I work for a diesel engine mob

take your car for a dyno and if you had to choose a compnent to pull off straight after between a turbo and an intake manifold you would choose the manifold

how do I know? because ive been in the position dyno a truck turbo blows...turcks gotta go...get in there and change that turbo....ive got burns permanently on my hands to prove it

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  • Moar Powar Babeh
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  • Member For: 19y 2m 3d
  • Gender: Male
  • Location: Perth

ok FG turbo

grwoler CAI and big mouth which sucks cold air from the grille.

located on the FG is the intake manifold hence beingHOTTERthan the other side which is the turbo side being the HOTTER side

Did you mean cooler..?

a turbo side intake is much hotter but travels a shorter distance..mate I work for a diesel engine mob

take your car for a dyno and if you had to choose a compnent to pull off straight after between a turbo and an intake manifold you would choose the manifold

how do I know? because ive been in the position dyno a truck turbo blows...turcks gotta go...get in there and change that turbo....ive got burns permanently on my hands to prove it

Two issues with your logic,

1. The longer the intake path before the turbo, the higher the turbo inlet pressure ratio. (look it up)

2. The amount of time the air spends in a turbo side CAI is so minute the heat transfer is minimal. A well designed CAI will still draw cool air from outside the engine bay. (A pod hanging off the turbo obviously wont)

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  • Member For: 12y 9m 23d
  • Gender: Male

Two issues with your logic,

1. The longer the intake path before the turbo, the higher the turbo inlet pressure ratio. (look it up)

2. The amount of time the air spends in a turbo side CAI is so minute the heat transfer is minimal. A well designed CAI will still draw cool air from outside the engine bay. (A pod hanging off the turbo obviously wont)

sorry mate I did mean colder side...

turbo inlet pressure ratio? the pressure divided between air entering the turbo and the difference to when its entering the inlet manifold?...maybe it might but IMO I think piping size from intake housingof to CAC and CAC to intake manifold would effect that...but I think that more of an engineering aspect...only thing we need to worry about is your inlet boost pressure which is wastegate related and just helpd overboost...I don't think the ratio means anything to us, none of us are engineers...we're just blokes doing up cars...

and your're number 2 point is absolutley correct...but look up FG turbo side intakes...they're very poor sitting directly behind the headlight...that's not very efficient for clean air...I think anyway...

CAC is the american term for intercooler

sorry to be difficult its just what im used to calling it from work

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