Slower when hot?
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From: South FL
The feeling sucks here in South FL. I either put the windows down and sweat my ass off so it doesn't feel as sluggish OR I put the AC on and feel like I'm driving a prius. Feels like it bogs at 2300-3000 RPMS if I get on it, then it slowly starts to get going.
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Originally Posted by FitzyS2k,Sep 11 2010, 02:33 PM
it also doesn't help that hot coolant is running through the TB. I took mine off once I got the car and the car never bogs at ALL!!!
Hard to do?
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no theres a post on here on how to do it. the whole thing about worrying if the TB will freeze up is BS. I drive my car in the winter and i've never had any probs with it. the engine bay is warm enough that ice doesn't form around the TB.
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Originally Posted by FitzyS2k,Sep 11 2010, 06:41 PM
no theres a post on here on how to do it. the whole thing about worrying if the TB will freeze up is BS. I drive my car in the winter and i've never had any probs with it. the engine bay is warm enough that ice doesn't form around the TB.
"Remember that the throttle body is like a big venturi and air flowing through a venturi will speed up, decrease pressure and hence, cool down. There is another purpose to that coolant line. The coolant continues to the Idle Air Control system so the ECU knows when to phase out of cold fast idle. Without the coolant going through the IAC, it must heat up via convection and conduction and the ECU may take much longer to step down idle. During this time period, the A/F is much richer than normal. A few people have blocked that line on purpose thinking that it will help prevent overheating of the throttle body. A well known and trusted S2000 tech has indicated many times in the past that this is false economy. It may temporarily keep the TB cooler but convection and conduction within the engine bay will strip away that advantage very quickly. In the process, the ECU will run the engine in a way that is less efficient."
tb bypass is no good apparently
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just curious, on the MY06 i know there is an intake temperature sensor. i think if the air is hot then the ecu pulls timing which also reduces power. what happens if i trick the sensor in thinking that the air is cold? for example, i take the senor and put it in cold water and then slap it on a dyno? also, let's assume that because of my ecu reflash, my engine also runs pretty rich? what would the dyno look like?
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Originally Posted by sean2k,Sep 11 2010, 10:24 PM
"Remember that the throttle body is like a big venturi and air flowing through a venturi will speed up, decrease pressure and hence, cool down. There is another purpose to that coolant line. The coolant continues to the Idle Air Control system so the ECU knows when to phase out of cold fast idle. Without the coolant going through the IAC, it must heat up via convection and conduction and the ECU may take much longer to step down idle. During this time period, the A/F is much richer than normal. A few people have blocked that line on purpose thinking that it will help prevent overheating of the throttle body. A well known and trusted S2000 tech has indicated many times in the past that this is false economy. It may temporarily keep the TB cooler but convection and conduction within the engine bay will strip away that advantage very quickly. In the process, the ECU will run the engine in a way that is less efficient."
tb bypass is no good apparently
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