Increasing intake air flow on a LT5
 

Does anyone know if Vararam or other brands make any intake air duct systems that increases the air flow to a ZR-1 (or other C4's)?

As you all know the intake duct is not the most free flowing and straight forward on any Corvette, and I know many have upgraded their C5, C6 and C7 models, but I have not found anything about the C4...

If anyone has experience or knowledge on this area please let me know.

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Re: Increasing intake air flow on a LT5
 

There are a few options I know of....

http://www.jerrysgaskets.com/duct-si...lue-90-95-12a/

http://zr1specialist.com/HAT%20Web/products/hoops.htm

Re: Increasing intake air flow on a LT5
 

Buy another stock air filter lid from any later C-4, very inexpensive.


Lay it on your work bench.


Put the filter in it.


Trace a line where the filter sits.


Remove the filter.


Get your tin-snips.


Remove all of the metal within the traced line.


Once that is complete.


Take a large coffee can or piece of metal.


Form it into the shape that will fit within the air duct.


Install it in your air duct.
Put it all back together.


You may then assert that it increases your horsepower and torque by some crazy number, but it will actually increase the air flow, and prevent the duct from collapsing.
And, best of all it does not cost $800.00, nor does it increase the chance of ingesting water into your intake air stream, like some of the expensive solutions.
More elegant solutions are out there, but in the meantime while searching them out, the above will work.
Marty

Re: Increasing intake air flow on a LT5
 

Oh I mean getting the air from the inlet under the nose and up in to the filter and intake. Not replacement parts like these. Maybe I did not explain good enough what I'm looking for...

Originally it goes in like thru a S-shaped duct, kinda like "zig zagging" up to the air filter box, not exactly free flow there.

There are headers and free flowing exhaust systems out there, but I can't find anything to improve the air flow in from the front to the intake...so the power is limited by the amount of air you can get in.

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Re: Increasing intake air flow on a LT5
 

Interesting Marty. My buddy and I were brainstorming a bit today regarding this. He has a modified C6 Z06 and use Vararam products. I emailed them and was told 5 min ago they have not been able to come up with any good solutions for C4 Corvettes...

Knowing the LT5 has huge potensial we are trying to find a good way to get more air into it, without turbos etc.

He can map and calibrate chips etc at his shop, so the fine tuning is no problem, just getting all that cold air out there in effectively..

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Re: Increasing intake air flow on a LT5
 

Not that I would but you can reverse the air filter, cut a hole in the shroud and let it pull air from in front of the radiator

Re: Increasing intake air flow on a LT5
 

Would not do that either. Cold air from the front with less restriction would be the case...if we can figure it out.

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Re: Increasing intake air flow on a LT5
 

Buy a SLP claw intake and save your original air filter assembly for originality in the future.


Lou

Re: Increasing intake air flow on a LT5
 

The "choke points" for air flow and the 95 rwph increase while maintaining the stock TB and cams didn't come from fussing with the intake/filter box. It came from porting, headers, SW "X" pipe and 3" exhausts.

OK, I had a K&N air box which exposes the air filter on top of the box, but with that and stock exhaust and Borla mufflers, it dynoed at 337 rwhp (now at 432, last time on the dyno).

If you open the runners to 36mm min on both the primary and secondary runners and taper the inlet to the heads from 36mm at the input to blend with the stock dimensions at or near the valve guide bosses, that alone will make an entirely different animal out of you LT5 and you won't have to pull the heads to do it either! (But, you WILL need a new tune, however!)

Re: Increasing intake air flow on a LT5
 

Interesting, Paul.

I have original exhaust with Borla mufflers, but will replace the center resonator with a x-pipe due to it being worn out and welded twice.

On a side note, I installed a new fuel filter today, and it became a monster from 5000 and up. It was fast before (had it for 2 months now and driven over 3500 miles), but man it went wild now. Probably never got what it should on full throttle before. All the small stuff adds up alright.

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