It's been in the 20's here lately, even down in the teens, and so far, no problems at all. Car maybe takes a little bit longer to warm up, but once she's going, she's fine.
ETB Bypass updates?
I did the mod a good time ago and from what I understand, this is the 1st winter that the mod is being used in. I was wondering if any body in the cold areas had any problems with it yet. I don't think it should cause a problem, but I guess it could freeze the throttle body is extreme cold. Just want some updates from people with the mod in REALLY cold areas.
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[quote author=oneill8769 link=topic=64545.msg1106972#msg1106972 date=1166027662]
It's been in the 20's here lately, even down in the teens, and so far, no problems at all. Car maybe takes a little bit longer to warm up, but once she's going, she's fine.
[/quote]
wow...20's and teen in FL? Snow oranges anyone?
It;s been really cold here too. I'm looking for any Canadians or north north US people
It's been in the 20's here lately, even down in the teens, and so far, no problems at all. Car maybe takes a little bit longer to warm up, but once she's going, she's fine.
[/quote]
wow...20's and teen in FL? Snow oranges anyone?
It;s been really cold here too. I'm looking for any Canadians or north north US people
Haha yeah, it seems sometimes that Tally isn't even party of Florida, more like Georgia.
But I see what you are saying, you're looking for people that deal with snow and whatnot, right?
But I see what you are saying, you're looking for people that deal with snow and whatnot, right?
yea...Theres a friggid cold air we get up here that you feel it in your bones and no matter what, you can't get warm. I am sure some people have gotten some of those already
On one hand I would be worried about it. If it sucks in enough humid air at near freezing or freezing , you could freeze open/shut your TB. But on the other hand, Ive driven TB cars without a coolant heater and never had any problems.
BTW, edrection, you get your stage IV installed? I see your sig changed from 'on order' to, well, I'm assuming installed, lol. PM me, so we don't jack the thread
No problems here over 2 winters. Logically, I can't even imagine the potential for a problem.
Bypassed or not, the TB is going to be equally cold when you first start the car--and that's the coldest it's ever going to be. The difference is only going to be between a hot TB and a warm TB. Put your hand on it after the engine is fully warmed up on a cold day--the engine radiates enough heat that anything that close to the block is going to get pretty toasty, whether or not there's coolant running through it.
[quote author=edrection link=topic=64545.msg1106996#msg1106996 date=1166028901]
On one hand I would be worried about it. If it sucks in enough humid air at near freezing or freezing , you could freeze open/shut your TB.
[/quote]
As far as that concern goes, the coldest the TB is going to ever get is the ambient air temperature. If the water vapor in the air isn't frozen before it hits the TB, it's not going to freeze afterwards, since there is no potential for further cooling of the air. And from the moment you turn the ignition switch, the tb is only going to increase in temperature, so it's always going to be at least as warm as ambient air.
Bypassed or not, the TB is going to be equally cold when you first start the car--and that's the coldest it's ever going to be. The difference is only going to be between a hot TB and a warm TB. Put your hand on it after the engine is fully warmed up on a cold day--the engine radiates enough heat that anything that close to the block is going to get pretty toasty, whether or not there's coolant running through it.
[quote author=edrection link=topic=64545.msg1106996#msg1106996 date=1166028901]
On one hand I would be worried about it. If it sucks in enough humid air at near freezing or freezing , you could freeze open/shut your TB.
[/quote]
As far as that concern goes, the coldest the TB is going to ever get is the ambient air temperature. If the water vapor in the air isn't frozen before it hits the TB, it's not going to freeze afterwards, since there is no potential for further cooling of the air. And from the moment you turn the ignition switch, the tb is only going to increase in temperature, so it's always going to be at least as warm as ambient air.
its been around 30 here and i havent had any problems yet
I know, if it starts your ok, and the engine heat will warm anything and everything up when sitting there....The way I see it, there would only be a problem if your on a highway for a long period of time and the cold air/snow hitting the TB and the engine heat not being able to warm up the ETB, even though the engine is a few inch away from the TB.
I also driven cars with no coolant flowing through, doesn't mean this will work out the same
I also driven cars with no coolant flowing through, doesn't mean this will work out the same
[quote author=dmention7 link=topic=64545.msg1107029#msg1107029 date=1166031191]
No problems here over 2 winters. Logically, I can't even imagine the potential for a problem.
Bypassed or not, the TB is going to be equally cold when you first start the car--and that's the coldest it's ever going to be. The difference is only going to be between a hot TB and a warm TB. Put your hand on it after the engine is fully warmed up on a cold day--the engine radiates enough heat that anything that close to the block is going to get pretty toasty, whether or not there's coolant running through it.
[quote author=edrection link=topic=64545.msg1106996#msg1106996 date=1166028901]
On one hand I would be worried about it. If it sucks in enough humid air at near freezing or freezing , you could freeze open/shut your TB.
[/quote]
As far as that concern goes, the coldest the TB is going to ever get is the ambient air temperature. If the water vapor in the air isn't frozen before it hits the TB, it's not going to freeze afterwards, since there is no potential for further cooling of the air. And from the moment you turn the ignition switch, the tb is only going to increase in temperature, so it's always going to be at least as warm as ambient air.
[/quote]
That's not entirely true. The throttlebody is simply an air valve. at idle, it's not shut like most cars, but open a crack to allow airflow. The air passing over the butterfly is moving VERY rapidly. This leads to an extremely low pressure drop at the trailing lip of the blade, which leads to evaporative cooling (the same principal your a/c system works on). Take the valve core out of a large tire which at any temperature and the tire is at 35 psi. All the air comes out, right? Wait, why is it slowing down? and what just popped and hit me in the face? A tiny ice ball. The moisture in the air inside the tire condensed and froze on the inner surface of the valve stem that is being super cooled by the high velocity air trying to escape.
In some point of Mazda's testing of the engine they experienced this phenomenom, and felt they needed to implement a heated throttlebody. Remember, if Mazda could have saved a dollar by not heating the TB, they'd have a million dollars + profit now. :lol:
No problems here over 2 winters. Logically, I can't even imagine the potential for a problem.
Bypassed or not, the TB is going to be equally cold when you first start the car--and that's the coldest it's ever going to be. The difference is only going to be between a hot TB and a warm TB. Put your hand on it after the engine is fully warmed up on a cold day--the engine radiates enough heat that anything that close to the block is going to get pretty toasty, whether or not there's coolant running through it.
[quote author=edrection link=topic=64545.msg1106996#msg1106996 date=1166028901]
On one hand I would be worried about it. If it sucks in enough humid air at near freezing or freezing , you could freeze open/shut your TB.
[/quote]
As far as that concern goes, the coldest the TB is going to ever get is the ambient air temperature. If the water vapor in the air isn't frozen before it hits the TB, it's not going to freeze afterwards, since there is no potential for further cooling of the air. And from the moment you turn the ignition switch, the tb is only going to increase in temperature, so it's always going to be at least as warm as ambient air.
[/quote]
That's not entirely true. The throttlebody is simply an air valve. at idle, it's not shut like most cars, but open a crack to allow airflow. The air passing over the butterfly is moving VERY rapidly. This leads to an extremely low pressure drop at the trailing lip of the blade, which leads to evaporative cooling (the same principal your a/c system works on). Take the valve core out of a large tire which at any temperature and the tire is at 35 psi. All the air comes out, right? Wait, why is it slowing down? and what just popped and hit me in the face? A tiny ice ball. The moisture in the air inside the tire condensed and froze on the inner surface of the valve stem that is being super cooled by the high velocity air trying to escape.
In some point of Mazda's testing of the engine they experienced this phenomenom, and felt they needed to implement a heated throttlebody. Remember, if Mazda could have saved a dollar by not heating the TB, they'd have a million dollars + profit now. :lol:
yes except that it is an emissions device. It is installed to heat the incoming air a little bit more then it would be otherwise, this increases fuel efficiency at least a tiny bit and you also have the benifit of warming up the car faster (thus also reducing emissions).
You would find the same thing on cable throttle bodies otherwise. You are right there is no idle air control valve on the ETB in the mazda 3 like you find on most cable throttle bodies, but at very low throttle openings (lower speed cruise) you would have this issue in spades as you would have low to moderate RPMs with tiny openings leading to very large pressure drops in that air.
So far no issues on my car (first winter I have had the by pass as well, but also experienced temps down to about 20F). No issues on any car with a cable throttle.
-Matt
You would find the same thing on cable throttle bodies otherwise. You are right there is no idle air control valve on the ETB in the mazda 3 like you find on most cable throttle bodies, but at very low throttle openings (lower speed cruise) you would have this issue in spades as you would have low to moderate RPMs with tiny openings leading to very large pressure drops in that air.
So far no issues on my car (first winter I have had the by pass as well, but also experienced temps down to about 20F). No issues on any car with a cable throttle.
-Matt
1 - 12 of 12 Posts
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