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Discussion Starter · #1 ·
I am restomodding my 83' Caballero, I have installed an LS1 with the factory fuel injection and want to make the cowl induction hood functional. I know there is no setup for this that I have found, so I would have to fabricate the pluming from the intake to the circle hole mounting in the hood. Is there anybody out there that has done this? Thanks for any help or ideas.
 

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The ‘05-‘06 GTO had a scooped hood that wasn’t functional, but a company made ductwork to fix that. If I recall correctly, though, it really wasn’t worth it. It made for some really tight turns in the air duct, didn’t add any power and in some cases caused trouble codes due to the short run and tight turns. Something about the MAF too close to the outside.
Patrick
 

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Discussion Starter · #3 ·
The ‘05-‘06 GTO had a scooped hood that wasn’t functional, but a company made ductwork to fix that. If I recall correctly, though, it really wasn’t worth it. It made for some really tight turns in the air duct, didn’t add any power and in some cases caused trouble codes due to the short run and tight turns. Something about the MAF too close to the outside.
Patrick
Thanks for the info, I was thinking there may be as problem with air flow and MAF sensor. I still want to try it though.
 

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87 Caballero Amarillo, original 305/200-4R, QJ
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Cowl induction really doesn't work out well with fuel injection. The air entrance with FI is all the way at the front of the engine, the cowl entrance is all the way at the back. Linking those 2 would create plumbing issues, airflow at low speed issues, it'd be somewhat like plumbing a stock carburated airhorn in a U shape, as bad as those things were for choking air intake, it'd be worse.

You'd only possibly see any power advantages after reaching 70-80mph+ and creating enough pressure at the base of the windshield to overcome the restricted, long air passages and feed that extra bit of pressure into the throttle body.

And that's not to mention any issues with the MAF/MAP systems.
 

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Will the intake manifold fit in a reversed direction, so the intake is at the rear? That would be the only way to overcome a long restrictive intake tube.
The real advantage is not air pressure, but temperature. FI is sensitive to intake air temperature. I see so many with a K&N cone behind the radiator sucking hot air and that hurts.
 

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87 Caballero Amarillo, original 305/200-4R, QJ
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There's 2 spots under the hood that really don't get warm, like the rest of the area under the hood. That's the spots right behind the headlights and the battery happens to sit in one of them. That leaves the drivers side open for TBI using a 'cold air intake' snorkel with a cone/box on the end, pulling in that colder air from next to the vacuum cannister.

It's why there's a long neck on the stock air cleaner, pointed right at the battery, when you'd think that a short or slotted opening in the path of the fan would be more beneficial.
 

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one time in the junkyard, I came across a Mustang that had cut about 3-4" round hole in the fender into the wheelwell right above the passenger tire. he had plumbed it with PVC fittings. don't know about the air temp he was pulling but thought that was pretty clever for getting air intake under a cramped hood
 

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Some of the LS type restomods have been flipping the intake manifold, putting the throttle body on the rear.
This seems to happen more on non GM cars.
Requires rewiring and making room for sensors and clearance.
Check LS1TECH - Camaro and Firebird Forum Discussion

Some of the Kenne Bell superchargers have the intake at the rear. Yet that can get to $10K with options.
 

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Ehh. That's a lot of work for little to no gain as I can see it, would only do anything if there was an open TB, no filter or if using a form of inducted air channeled into the filter, like a ram-air setup. The TB will be only partially open most times, except at wot or close to it, so trying to ram air past it will just make the map/maf sensors close it even more.

Youd see more benefit from a simple cold-air induction setup as that'll cover the whole range of throttle response, not just wot at high enough speeds for enough pressure to actually see the cowl. It's a pretty neat idea, just mostly impractical.

Imho.
 
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