View Poll Results: I have done the TB Bypass mod and
Seen or felt a performance gain
36
23.23%
NOT felt or seen any gain over non-TB Bypass setup
119
76.77%
Voters: 155. You may not vote on this poll
TB Bypass - anyone seen gains?
ITs better for the long run............bla bla bla, the tb is cooler to take off.........? Yea i just take my TB off every day, so it really matters how hot it is? THis whole thing about TBB is lame. IF you want to do it do IT, if not dont? NO seat of the pants gain, no big HP, its a cooler TB, my buddy did it and he runs 13.96 with his IAT out too, i have all this and no TBB and IAT in and im almost there. IMO i would do it tho, its a $8 gain.
i did it just because it was so cheap, and i have a hard time going a week without doing anything to my car.
I found an even cheaper way to do it, by the way. Some of you might have done this, but instead of buying couplers or kits and such, i just bought a 2' hose of the correct size and connected it directly from the radiator to the head coolant lines, bypassing the TB and the factory hoses. That stuff is like $.50 a foot so i paid about a dollar for the mod.
I found an even cheaper way to do it, by the way. Some of you might have done this, but instead of buying couplers or kits and such, i just bought a 2' hose of the correct size and connected it directly from the radiator to the head coolant lines, bypassing the TB and the factory hoses. That stuff is like $.50 a foot so i paid about a dollar for the mod.
I do it only when I get to the track only, because for some reason when it is cold and I do the bypass my car surges up and down and is very annoying when at a stop light. I can plug it back up to the throttle body and the surging stops. So it is there for a reason.
TECH Enthusiast
Joined: Oct 2004
Posts: 607
Likes: 1
From: Anna, OH
Sounds like you have another problem. The TB Bypass does nothing that would create the symptoms you describe.
And yes, it does have a function. It heats up the air for starting in really cold climates. If heating the TB was good for performance reasons, you'd see it on every race car. In fact, you see the opposite.
GM, like all manufacturers, has to worry about things other than performance.
And yes, it does have a function. It heats up the air for starting in really cold climates. If heating the TB was good for performance reasons, you'd see it on every race car. In fact, you see the opposite.
GM, like all manufacturers, has to worry about things other than performance.
Originally Posted by LTSpeed
Sounds like you have another problem. The TB Bypass does nothing that would create the symptoms you describe.
And yes, it does have a function. It heats up the air for starting in really cold climates. If heating the TB was good for performance reasons, you'd see it on every race car. In fact, you see the opposite.
GM, like all manufacturers, has to worry about things other than performance.
And yes, it does have a function. It heats up the air for starting in really cold climates. If heating the TB was good for performance reasons, you'd see it on every race car. In fact, you see the opposite.
GM, like all manufacturers, has to worry about things other than performance.
I know what its function is for and I know it hurts performance slightly by heating the throttle body which in theory is heating up the incoming air passing thru it. Thats why I do the mod at the track. But it does make my car surge when done and it also does the same thing on my mustang. Don't know why it does this but it does it. When I plug it back up the surging stops. It probably is something else causing this cause my brother has same car and has no problem. Its just funny that it is happening to both of my cars when it gets really cold.
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I've tried this mod and on the way home from the 1st autoX event the rubber hose ruptured and I dumped coolent all over the road. I may give this mod another shot with better hose, but to be honest, I really didn't "feel" and gain but that doesn't mean there wasn't any.
Originally Posted by TransAm12sec
Yes the first reason it was put there was to prevent the throttle blades from freezing open. If the temperature is below freezing and your rpms keep going up, shut the motor off immediately. Older carbs used heat from the exhaust manifolds for the same reason.
Because these cars must be designed to be driven year round in all 50 states, this (coolant through the tb) is needed from the factory. If your car is never started below 32 degrees F, you don't need it.
Because these cars must be designed to be driven year round in all 50 states, this (coolant through the tb) is needed from the factory. If your car is never started below 32 degrees F, you don't need it.
I didnt see any gains. Nor did I expect to. Its not logical for keeping the TB cooler to increase power. Honestly, My TB is still too hot to handle right after I turn off the car (granted this is when i've been driving in w/ IAT's of 100+. But still a good 20 min cool down is always necessary before I start working on the TB.
I think I remember in cooler weather, there being less of a problem of the TB heating up. In that case maybe the IAT has an effect on cooling down the TB.
Bottom line is though that it makes removing the TB SO SO SO SO SO much easier, as you don't have to worry about coolant spilling out.
I think I remember in cooler weather, there being less of a problem of the TB heating up. In that case maybe the IAT has an effect on cooling down the TB.
Bottom line is though that it makes removing the TB SO SO SO SO SO much easier, as you don't have to worry about coolant spilling out.
TECH Regular
Joined: Oct 2005
Posts: 430
Likes: 0
I checked this out many years ago on a TPI Camaro. It dropped the IAT reading ~8 degrees on the Westwood B.C. road race track, which translates to 0.8% HP, i.e. 3 HP from a baseline of 400. Plug in a scan tool and see what it does for you...
Last edited by MadBill; Oct 23, 2005 at 05:08 PM. Reason: additional detail
Originally Posted by bostonhatcher
The reason why they have the radiator fluid flow through the throttle body is to cool it off with the air intake before it goes into the radiator. It's not to heat up the throttle body to unfreeze it in the winter time because the radiator fluid doesn't even start to flow until the engine is hot which would unfreeze the throttle body. Also, metal doesn't freeze, liquid does.
There've also been dyno proven results. They show an increase not only when the engine is cool, but also when heat soaked. About 5HP improvement. Not something you'll feel necesarily, but it is there.
I've run it on both my Camaro's LT1 and LS1. At temperatures in the single digits there's been no negative impact.
Just to throw a wrench in the works, what if the coolant lines on the TB are there 2 keep it from freezing, AND to stabilize temps when it gets really hot out, think about, under hood temps regulated be constant coolant flow, any answer to that internet mechanics? 
TECH Apprentice
Joined: Nov 2001
Posts: 329
Likes: 0
From: SoFla
GM installed the TB passage for a reason: warm up the TB quicker in colder climates to help meet emmission standards as quickly as possible.
I performed this mod on my 94 LT1, 99 LS1, my wife's 99 LS1 and my 02 LS1. All this mod. does is prevent the TB from reaching coolant temp. allowing cooler more dense air to reach the intake manifold. It is a proven mod. that yields up to 5 RWHP years ago.
The fact it allows for quicker TB removal is an added benefit
I performed this mod on my 94 LT1, 99 LS1, my wife's 99 LS1 and my 02 LS1. All this mod. does is prevent the TB from reaching coolant temp. allowing cooler more dense air to reach the intake manifold. It is a proven mod. that yields up to 5 RWHP years ago.
The fact it allows for quicker TB removal is an added benefit
Last edited by DRGnFLYZ28; Dec 11, 2005 at 10:03 AM.
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Joined: May 2005
Posts: 1,135
Likes: 1
From: The 'Burgh, PA
