Most likely its some piece of crap that will get sucked into the intake and damage a valve or a piston. 
throttle body bypass tube?
Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
Melting Slicks
Joined: Mar 2005
Posts: 2,891
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From: North Port Fl
Don't waste your money. The air is only in the throttle body for a millisecond as it travels to the intake, not long enough for the temperature of the throttle body to affect it. If you feel the need to needlessly waste your money on a throttle body bypass, you can buy the parts to make your own at your local Lowes or Home Depot for about $3.
Team Owner
Joined: Dec 2008
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From: Honolulu HI
None of these are worth doing for themselves...if you are doing a coolent flush for scheduled maintenance, you can throw a low temp t-stat in. It won't do anything until you have a tuner turn the fans on sooner though. TB flow booster...no, just no. If you want a ported TB, then go ahead and do the bypass while the TB is off. But none of this is worth any real HP. Spend the money on a good cold air intake like a Vararam or Honker...those actually make real HP that you will notice.
Team Owner
Joined: Dec 2008
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From: Honolulu HI
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Burning Brakes
Joined: Oct 2008
Posts: 1,062
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From: Minnesota City MN
The throttle body by pass tube is a great idea if you plan on swapping out the intake manifold at a later date. Thats about the only thing its good for...saving time when working on other things.
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Joined: Apr 2007
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From: South Western Ontario
I bypassed mine because I had it apart and that short little 90 degree hose is a pain in the *** to get off. I also found that 90 degree hose a little rotten so it got replaced with a straight piece and a coupler.I did that last winter. Last summer, I had a very slight throttle tip-in surge. I'm not 100% sure if it's related but I changed 2 things, the bypass and the filter in the Vararam so it has to be one of the 2 causing the surge. Haven't bothered changing it back yet but next summer I might just to see if that's the problem.
Peter
Le Mans Master
Joined: May 2005
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From: Fort Lauderdale, Florida
The airfoil thing is a waste of money, it does nothing. Anything you insert in the throttle body has to in some way reduce the diameter of the opening, which is backwards if you're trying to increase airflow. The lower temp thermostat is useful if you get stuck in summertime traffic often, however you need a tuner to adjust the fan temp turn-on and off or the thermostat will accomplish nothing. On a previous C5 I owned I did a throttle body bypass. The only thing you need is a rubber hose long enough to connect to both ends where the bypass kit would attach. I just attached the hose directly from the intake manifold to the radiator and eliminated the whole assembly. Costs about 2 bucks. It probably has a minimal affect on performance but it makes it easier in the future anytime you might need to remove the throttle body. No disconnecting and coolant drips.
BTW, if you ever do have cooling issues, before you do anything else, clean the radiator. Alot of junk gets up in there. Makes a screen that blocks the radiator cavity from having trash going up and clogging the radiator.
BTW, if you ever do have cooling issues, before you do anything else, clean the radiator. Alot of junk gets up in there. Makes a screen that blocks the radiator cavity from having trash going up and clogging the radiator.
Race Director
Joined: Dec 2006
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From: Fort Worth, Texas
I bypassed mine because I had it apart and that short little 90 degree hose is a pain in the *** to get off. I also found that 90 degree hose a little rotten so it got replaced with a straight piece and a coupler.I did that last winter. Last summer, I had a very slight throttle tip-in surge. I'm not 100% sure if it's related but I changed 2 things, the bypass and the filter in the Vararam so it has to be one of the 2 causing the surge. Haven't bothered changing it back yet but next summer I might just to see if that's the problem.
Peter
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From: South Western Ontario
Peter
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From: Fort Worth, Texas
Melting Slicks
Joined: Dec 2004
Posts: 2,847
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From: Sleepy Hollow- NJ
The airfoil thing is a waste of money, it does nothing. Anything you insert in the throttle body has to in some way reduce the diameter of the opening, which is backwards if you're trying to increase airflow. The lower temp thermostat is useful if you get stuck in summertime traffic often, however you need a tuner to adjust the fan temp turn-on and off or the thermostat will accomplish nothing. On a previous C5 I owned I did a throttle body bypass. The only thing you need is a rubber hose long enough to connect to both ends where the bypass kit would attach. I just attached the hose directly from the intake manifold to the radiator and eliminated the whole assembly. Costs about 2 bucks. It probably has a minimal affect on performance but it makes it easier in the future anytime you might need to remove the throttle body. No disconnecting and coolant drips.
BTW, if you ever do have cooling issues, before you do anything else, clean the radiator. Alot of junk gets up in there. Makes a screen that blocks the radiator cavity from having trash going up and clogging the radiator.
BTW, if you ever do have cooling issues, before you do anything else, clean the radiator. Alot of junk gets up in there. Makes a screen that blocks the radiator cavity from having trash going up and clogging the radiator.
Good advice.
Race Director
Joined: Apr 2007
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From: South Western Ontario
The only useful (debateable here too) airfoil I can recall is the one for the 2 bore TPI and LT1 engines. The LS1 is a single bore throttle body so no place for that thing.
Peter
Peter
Burning Brakes
Joined: Apr 2008
Posts: 877
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From: Nouvelle Ecosse
To the OP,
Just get the bypass and a ported TB....I've seen them on here for as cheap as $90 plus $3-5 for the coolant bypass and you're good to go. That Thermostat will require you to reprogram the fans...if you don't have a programmer...you'll need a tuner to do it...and you might as well get a street tune done at the same time to wake up the car.
Last edited by JCamaro; Jan 10, 2010 at 12:44 PM.
Tech Contributor
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Just port your own TB or purchase a ported TB from a forum vendor. You will gain some throttle response. Maybe a few hp but nothing to write home about.
BC
BC
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From: South Western Ontario