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?
Originally Posted by DMNSPD
Who cares. Nothing wrong is going to come from it if you do it. IMO, the biggest reason to do it is so you can pull the TB on and off in seconds rather than minutes.
This goes in the every-little-bit helps catagory. However, there is no way that there will be a measurable power increase from something this minor, certainly not enough to detect by SOTP.
There probably is a legitimate reason for it in very cold weather but I live in Phoenix.
Steve
There probably is a legitimate reason for it in very cold weather but I live in Phoenix.
Steve The biggest reason to do it is because there is no reason not to do it. Every little bit counts, and there are NO negative effects. You can only benefit from this mod. The TB is not the only thing that gets hot. The TB heats up the whole intake tract when the hot coolant is allowed to flow through it. Can anybody find ONE person who did the $2 TB bypass and had their butterfly plate stick open? This mod has been done in climates with temps well under 32 degrees, without this ever happening. Even if this did happen, it wouldn't be the end of the world.
Originally Posted by Crazy Man
Ive started my car at 15degrees and colder several times here in NC it ran and everything worked fine. Just let it warm up before driving....
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Originally Posted by MeentSS02
Famous last words IMO...like I said earlier (and I'm gonna stick to my guns), there was brain power that went in to putting this feature there. If GM could have saved a little money (which they would have), they would have left this off. Just like doing any mod, there are potential drawbacks, no matter how remote the possibility or consequence.
GM also put a skip shift feature on our cars, but you don't hear people praising it.
I own two LT1s and both are bypassed and both have plenty of time spent even well below 0F. One of them I have had bypassed for around 100K and winters here always include below zero weather and work has me leaving long before the sun is up warming anything.
DMNSPD made the point about skipshift, how about PWM another great idea huh, Furd had engineers that said yeah 23psi is enough for truck tires and the list goes on. Manufacturers do a lot of things many of which have motivation far removed from the performance we seek from our cars.
If someone wants to do an easier test an infared temp gun pointed at the inlet and outlet of the TB coolant passeges would give some idea how efficient a heat exchanger the TB is, granted we wouldn't know volume but it would offer some insite.
The LT1 guys have been doing this mod since before the LS1 existed and they have no problems with it and I am sure there were even others before. If you are of the mindset that it wont help then wait till you have to disconnect the TB for cleaning or something to do it.
DMNSPD made the point about skipshift, how about PWM another great idea huh, Furd had engineers that said yeah 23psi is enough for truck tires and the list goes on. Manufacturers do a lot of things many of which have motivation far removed from the performance we seek from our cars.
If someone wants to do an easier test an infared temp gun pointed at the inlet and outlet of the TB coolant passeges would give some idea how efficient a heat exchanger the TB is, granted we wouldn't know volume but it would offer some insite.
The LT1 guys have been doing this mod since before the LS1 existed and they have no problems with it and I am sure there were even others before. If you are of the mindset that it wont help then wait till you have to disconnect the TB for cleaning or something to do it.
Originally Posted by 96capricemgr
The LT1 guys have been doing this mod since before the LS1 existed and they have no problems with it and I am sure there were even others before.
No gains, but it's a piece in the puzzle called performance-seekers.
1 - It is there to make the air a little warmer for winter days - the coolant warms up quick and it will heat up the TB body. That makes the air less dense, not because GM doesn't like performance, but because EPA has a strangle hold on the auto industry.
2 - The bypass will only avoid the air to warm up a little. Colder air equals denser air which helps improving performance.
3 - No dyno, no SOTP from this mod alone. It's all a bunch of factors together. On a 110 degree day a TB bypass is useless. On "normal" temp days, the colder the air is, the better.
That's it.
1 - It is there to make the air a little warmer for winter days - the coolant warms up quick and it will heat up the TB body. That makes the air less dense, not because GM doesn't like performance, but because EPA has a strangle hold on the auto industry.
2 - The bypass will only avoid the air to warm up a little. Colder air equals denser air which helps improving performance.
3 - No dyno, no SOTP from this mod alone. It's all a bunch of factors together. On a 110 degree day a TB bypass is useless. On "normal" temp days, the colder the air is, the better.
That's it.
QUOTE:like I said earlier (and I'm gonna stick to my guns), there was brain power that went in to putting this feature there. If GM could have saved a little money (which they would have), they would have left this off.
It was probably the same brain that put a 7.5" rear end in a 5.7l V8.
Not everything that a car comes with from the factory is good for performance and/or necessary for your car to run right. Take top speed limiters for example. The dealer sets the top speed limiter to correspond to a given tire rating. The dealer doesn't want you to exceed the speed rating of the tire, have it blow and then deal with a lawsuit. If there were no speed limiters though how often would this really happen. I think the TB is similer. They don't want you to drive the car when it's 40 below and have the throttle plate stick open and then have a lawsuit. How often has this happened though....never.
It was probably the same brain that put a 7.5" rear end in a 5.7l V8.
Not everything that a car comes with from the factory is good for performance and/or necessary for your car to run right. Take top speed limiters for example. The dealer sets the top speed limiter to correspond to a given tire rating. The dealer doesn't want you to exceed the speed rating of the tire, have it blow and then deal with a lawsuit. If there were no speed limiters though how often would this really happen. I think the TB is similer. They don't want you to drive the car when it's 40 below and have the throttle plate stick open and then have a lawsuit. How often has this happened though....never. 
I guess I better sell my "race" style headers and buy some with emission provisions and get the AIR put back on the car, it must help performance a lot 
And while I'm at it remove that resistor so the POS skip shift will operate again 
C'mon guys, quit being a bunch of ****** about this TB mod. It might not give the performance of a lid, but it is a quick, easy, every little bit helps mod that is worth the time saved in the ease of future removal of the TB down the road. And I as well have operated my two LS1 vehicles in below freezing conditions with absolutely ZERO problems.
And while I'm at it remove that resistor so the POS skip shift will operate again C'mon guys, quit being a bunch of ****** about this TB mod. It might not give the performance of a lid, but it is a quick, easy, every little bit helps mod that is worth the time saved in the ease of future removal of the TB down the road. And I as well have operated my two LS1 vehicles in below freezing conditions with absolutely ZERO problems.
Originally Posted by Redneck Z
QUOTE:like I said earlier (and I'm gonna stick to my guns), there was brain power that went in to putting this feature there. If GM could have saved a little money (which they would have), they would have left this off.
It was probably the same brain that put a 7.5" rear end in a 5.7l V8.
It was probably the same brain that put a 7.5" rear end in a 5.7l V8.
Originally Posted by TAQuickness
I agree with Meent. It's there for a reason, otherwise, GM wouldn't have spent the money on it.
something good to not get them sued is not necessarily good for performance. and just cause they get paid good doesn't mean they know what they are talking about. look at the Aztec, somebody was paid to design that and it looks like crap
QUOTE:I happen to agree with that, but on the same token I would say that Engineers that make over 1M a year probably know what they're doing, better than all of us "experts" here.
Yeah, someone also got paid over 1 million a year to design the Geo Prizm. I guess by your reasoning, that means the prizm has a perfect design and can't be improved upon. Parts that were designed by "experts" get recalled ALL the time. Just because a part came a certain way on your car, does not mean that it can't be improved upon. If that was the case we'd all be driving slow, stock cars.
By the way, surgeons are "experts" in their field and don't always route their bypass's in the most optimal manor. Some patients end up with recurrent stenosis for this very reason. Somtimes the way a surgeon operates is dictated more by insurance and politics than pure inginuity. The same can be said for car manufacturers.
Yeah, someone also got paid over 1 million a year to design the Geo Prizm. I guess by your reasoning, that means the prizm has a perfect design and can't be improved upon. Parts that were designed by "experts" get recalled ALL the time. Just because a part came a certain way on your car, does not mean that it can't be improved upon. If that was the case we'd all be driving slow, stock cars.
By the way, surgeons are "experts" in their field and don't always route their bypass's in the most optimal manor. Some patients end up with recurrent stenosis for this very reason. Somtimes the way a surgeon operates is dictated more by insurance and politics than pure inginuity. The same can be said for car manufacturers.
Last edited by Redneck Z; Aug 26, 2005 at 04:20 PM.