Cold Air Mod?
Thread Starter
Drifting
Joined: Oct 2004
Posts: 1,754
Likes: 267
Cold Air Mod?
I have a 2011 GS coupe with 6spd manual tran and I'm interested in getting a little more hp by providing cooler air to the intake. I'd like to preserve the stock setup, but possibly modify the shroud in front of the radiator to provide cooler air to the filter. I'm sure there must be posts out there on this, but haven't found the 'right' one that cleary explains pros and cons .... and 'how to'. If anyone can steer me in the right direction, that would be great. Thx. -DJ
Team Owner
Joined: Feb 2001
Posts: 27,246
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From: Short Hills, NJ
Team Owner
Joined: Sep 1999
Posts: 41,732
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From: Springfield MO
The LS3/LS7 MAF's do not like the turbulance from a mod made to the shroud. I installed a Vette-Air scoop and had to make a flat diffuser plate to cover the discharge side of the scoop to keep the forced air from being directed into the mouth of the breather on my Z06. After installing the diffuser...zero surging.
Thread Starter
Drifting
Joined: Oct 2004
Posts: 1,754
Likes: 267
Good to know. I'm not intending to create a forced air sytem that would create a lot of turbulence..... but would like to introduce some fresh air to the intake. One thought I've had is to use hole saw (maybe 1.5" dia) and cut a series of holes in the shroud in a line (side to side) just behind the bumper and under the intake. This would allow fresh air in, but it wouldn't be forced and I wouldn't need to worry about water being ingested. I'm in no hurry so will give it more thought.
Suggestions, concerns??
Suggestions, concerns??
Safety Car
Joined: Nov 2007
Posts: 4,433
Likes: 873
From: Bay Area CA
Good to know. I'm not intending to create a forced air sytem that would create a lot of turbulence..... but would like to introduce some fresh air to the intake. One thought I've had is to use hole saw (maybe 1.5" dia) and cut a series of holes in the shroud in a line (side to side) just behind the bumper and under the intake. This would allow fresh air in, but it wouldn't be forced and I wouldn't need to worry about water being ingested. I'm in no hurry so will give it more thought.
Suggestions, concerns??
Suggestions, concerns??
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Thread Starter
Drifting
Joined: Oct 2004
Posts: 1,754
Likes: 267
Go on Jim Haltech's website and look up how to install cold air ports on the oem shroud using the Beehive Shroud. You can open two elongated holes at the lower ends of the oem shroud to introduce fresh air. Install the Beehive Shroud to keep the hot air out of the air intake bay. I used this method both with the Killer Bee air intake and modified the Beehive shroud to fit the oem intake. I have no issues of surging with either set up. The open cold air ports work best with the Beehive Shroud which helps to prevent hot air entering the air intake.
I'm not finding this 'how to' guide. Can someone direct me to it? I'd like to open up the shroud on my LS3 to allow some fresh air in ....but definitly don't want surge trouble.
Safety Car
Joined: Nov 2007
Posts: 4,433
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From: Bay Area CA
Thread Starter
Drifting
Joined: Oct 2004
Posts: 1,754
Likes: 267
Many thanks for directing me to the instllation link.....
Good videos. Apparently there are two setups, ram air vs not? For the non-ram air setup, where is the intake air drawn from? Still under the hood? If so, the why the 'beehive? on top? .... just appearance?
Good videos. Apparently there are two setups, ram air vs not? For the non-ram air setup, where is the intake air drawn from? Still under the hood? If so, the why the 'beehive? on top? .... just appearance?
Safety Car
Joined: Nov 2007
Posts: 4,433
Likes: 873
From: Bay Area CA
The non-ram air set up is for the Z06 and GS which both have a front nose air duct that allows in cold air flow. However, opening the lower oem shroud ports allows more air flow that reduces the temps inside the shroud quicker when leaving a stop light. Also the open ports work for base coupe which has no front air duct. If no ports are open, as with the base coupe, air will still come in around the bottom frame rails. The idea of the Shroud is to prevent hot engine air entering the air intake. Once ambeint air reaches 86* F, the ECM, engine computer management, starts to pull timing which reduces hp.
Burning Brakes
Joined: Feb 2003
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From: Tampa Fl
St. Jude Donor '07
Be very careful cutting the shroud. The AC condenser is behind the shroud and very easy to knick. It's happened to several on here and it's an expensive repair.
VOICE OF EXPERIENCE!
VOICE OF EXPERIENCE!
Thread Starter
Drifting
Joined: Oct 2004
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btw ....does anyone make a cover (similar to the beehive cover) for stock GS models? It seems like there would be some performance improvement by ading a K&N filter and shrouding the intake to keep the hot air out.
Safety Car
Joined: Nov 2007
Posts: 4,433
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From: Bay Area CA
Not enough demand for it, however some forum members made their own. I used Halltech's Beehive shroud for the Killer Bee 1 air intake and trimmed the shroud to fit the oem air intake. I made a cardboard template of the oem air intake opening and traced the opening onto the Beehive Shroud. Basically, just trimed the air bridge opening to allow the oem air intake to fit. Results: oem air intake with shrould and cold air ports and no surging issues.
Last edited by Mike's LS3; Oct 5, 2011 at 12:18 PM.
Le Mans Master
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