what does the throttle body bypass do?

[Steves94Z28]

hey everyone, just curious.....what actually does bypassing the TB do? I was reading on shoebox's site and just wanted to know what i could expect and was it worth doing? Thanks!

[Boost Addict]

Stops coolant from going through the throttle body and reduces intake temps. Not a good idea if the car is driven in cold weather.

[Steves94Z28]

Stops coolant from going through the throttle body and reduces intake temps. Not a good idea if the car is driven in cold weather.

10-4 brother, its cold here so i think i will pass on this mod!......

[meissen]

Yeah - while I do have it done on my own vehicle, it's kind of a pain in the dick because the rubber caps for the bypass don't like to hold that well and leak every so often.

[JoeliusZ28]

10-4 brother, its cold here so i think i will pass on this mod!......

I just drove my modded LT1 with the bypass in 15 degree weather this morning. No issues.

[1BADAIR]

You move to Alaska? Was 40's in Michigan

[JoeliusZ28]

You move to Alaska? Was 40's in Michigan

Its warmed up now. 6:30 this morning my thermometer showed 15 degrees, nice and frosty!

[landstuhltaylor]

Stops coolant from going through the throttle body and reduces intake temps. Not a good idea if the car is driven in cold weather.

Daily drove my old 96 with this done and it saw a some -5 to 0 degree weather without an issue. I don't think this is a problem unless you live up in the Rockies and it hits -15 or worse.

[Fox Slaughter]

How could the cap leaks? All I did was loop the coolant back into the system and the caps on prevent stuff from getting into the throttle body.

If the throttle body really needed coolant to stop it from icing up then how does a carb stay free of ice? Or other throttler bodies that don't have it.
I think it was just an idea they came up with.
The intake is a dry intake anyways so only the moisture in the air could freeze to the blades.

[Boost Addict]

How could the cap leaks? All I did was loop the coolant back into the system and the caps on prevent stuff from getting into the throttle body.

If the throttle body really needed coolant to stop it from icing up then how does a carb stay free of ice? Or other throttler bodies that don't have it.
I think it was just an idea they came up with.
The intake is a dry intake anyways so only the moisture in the air could freeze to the blades.

Carbureted/tbi vehicles would have a heat riser coming of an exhaust manifold up to the air cleaner. Most would have coolant through the intake so that would aid with radiant heat.

[JoeliusZ28]

Yeah [MENTION=193]meissen[/MENTION] i believe mine is also looped right back to the radiator, i dont have any caps anywhere other than the TB which is only trapping air... i did it more for looks than anything.

[hoogiesngrinderz]

Ricky pretty much nailed it.

I can't say it will not ever freeze up, especially if you're driving in cold weather with a rain/sleet/snow mix. Not something I'd ever want to experience. Then again, I know how to react in such a situation...many people may not. It's kind of like the runaway Toyotas

Plus, I have a feeling it's also for emission reasons. Starting in the 80's the operating temps shot up to make for a more efficient burn and reduce greenhouse gasses, mainly NOx if I remember right. EGR is the same principle. Less air means less fuel and a slower burn, which leads to lower combustion temperatures and ultimately lower NOx emissions.

[meissen]

How could the cap leaks? All I did was loop the coolant back into the system and the caps on prevent stuff from getting into the throttle body.

If the throttle body really needed coolant to stop it from icing up then how does a carb stay free of ice? Or other throttler bodies that don't have it.
I think it was just an idea they came up with.
The intake is a dry intake anyways so only the moisture in the air could freeze to the blades.

Yeah @meissen i believe mine is also looped right back to the radiator, i dont have any caps anywhere other than the TB which is only trapping air... i did it more for looks than anything.

Yeah I was thinking of the vacuum line for the EVAP at the top of the throttle body. I had that capped with a rubber cap and it got brittle, cracked, and the throttle body started sucking air making the car run lean.

[JoeliusZ28]

That hose is brittle on my car too... I remember it backfired while starting one day at woodward and it was idling at 2000 RPM ...blew that vacuum line clean off the TB, i should probably address that before it happens again

[Steves94Z28]

So i am torn between doing it or not doing it???? What is the general conscious, good idea and may help improve performance, mainly just for looks or leave it alone all together?