It dosent boil fuel if you dont have the bypass the hot coolant heats the air going into the intake. If you do the bypass you'll get cooler air into the intake.

 

The TB coolant lines allows the warm coolant to enter the housing in order to prevent electronics from freezing up and the butterfly from sticking open or closed. In climates where it never reaches (or barely reaches) below zero, its not really needed. I'm not sure if it helps to remove the coolant lines from the TB, but it can't hurt. U figure anywhere you can subtract heat from the engine is usually a good thing. This has nothing to do with the fuel tho.

 

Just a reminder, these mods are for the LS based engines.

 

Well, first of all there is no fuel in the throttle body. You're thinking of a standard carburetor that has fuel in the float area which can boil if the intake manifold gets too hot.

With these fuel-injected Chevy V8's, the gas is piped thru rails above the valve covers and is sprayed directly into the intake ports. The only thing that flows thru the throttle body is air. The reason that Chevy runs engine coolant thru the base of the throttle body (as someone already noted) is to warm the air and butterfly valve to aid in cold weather performance. In areas where the temperatures rarely get below freezing this isn't an issue, so bypassing the coolant from the throttle body helps keep that area cooler when the engine is hot. Thisin turn helps the air stay more dense which results in a slightly higher concentration of oxygen in the combustion chamber. More oxygen means a touch more power when the spark plug ignites.

 

HOW MUCH DID THE HEADERS HELP YOUR TRUCK

 

ok so i got to know every one talks about all these mods but what about cutting off the cats?

 

Go ahead and cut your cats off.. I live in California so I cant.. but if you can get away with it, go for it.. Just make sure you still have a muffler. Your gonig to need some back pressure to 1. not burn up your valves and 2. keep some power at the bottom end... If you want cats still go with highflow cats and a new Y pipe that isnt smashed into an oval...

 

I can't locate the source, but I previously saw a flow test done on "Highflow" converters. They flowed around 500cfm. Stock cats flow around 480cfm. Take that into consideration when deciding if they're worth it.

If you really want to see some improvements, get a set of OBX headers with their Y pipe. It has resontaors that look like cat. converters but they're straight through...

 

ok im not sure if this is the same for everyone but the instructions for the tb bypass are cut off. could someone please re-post. also i dont seem to have any insulation pads. any thoughts

 

Throttle body bypass instructions (click).

Insulation pads??