Car runs better cold
10-16-2006, 09:38 PM
#1
Car runs better cold
Hey i got a 99 si with a gsr in it, and i have a small problem. The car tends to run noticably faster when it first warms up from being cold, like as soon as its in operating temperature i engage vtec and it is noticibly stronger than when ive been driving for like 15 minutes. What could be the reasons for this? Thanks for your help in advance. 
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10-16-2006, 11:30 PM
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Re: (Mr. Em1)
i say the cars running a little warm after driving it for 15mins check your fluid thermostat all that good stuff or maybe it just you and you think it runs better cause you just got in it and after driving it you get use to it agian or maybe your car dont like you and when you frist drive it it thinks your some one else and after it relizes its you it starts running like but in hopes that youll sell it or leave it parked
10-17-2006, 12:20 AM
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Re: (asshat)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by asshat »</TD></TR><TR><TD CLASS="quote">i say the cars running a little warm after driving it for 15mins check your fluid thermostat all that good stuff or maybe it just you and you think it runs better cause you just got in it and after driving it you get use to it agian or maybe your car dont like you and when you frist drive it it thinks your some one else and after it relizes its you it starts running like but in hopes that youll sell it or leave it parked</TD></TR></TABLE>
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10-17-2006, 03:46 AM
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Uhh...cars run better after getting to standard operating temperature.
That's why your car races when you turn it on in cold weather, it's trying to get to standard operating temperature as quickly (but still safely) as possible because it's bad to go hard on a cold block.
Now from what you're saying, when the ambient temperature is lower, your car generally has more power due to the increased ammounts of oxygen in the air. That's why on a dyno they tell you to do it in the evening when the sun's not beating down and heating the air (or as much of it).
So stardard operating temperature in cool weather is ideal for most engines.
That's why your car races when you turn it on in cold weather, it's trying to get to standard operating temperature as quickly (but still safely) as possible because it's bad to go hard on a cold block.
Now from what you're saying, when the ambient temperature is lower, your car generally has more power due to the increased ammounts of oxygen in the air. That's why on a dyno they tell you to do it in the evening when the sun's not beating down and heating the air (or as much of it).
So stardard operating temperature in cool weather is ideal for most engines.
10-17-2006, 04:54 AM
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Re: Car runs better cold (dowdle)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dowdle »</TD></TR><TR><TD CLASS="quote">its better to let the car warm up before you drive it. let it get to operating temp before driving it. </TD></TR></TABLE>
gj completely missing what hes saying
cold air is definitly a lot healthier then when warm, your engine just has a knack for liking the cold
so does my intercooler
gj completely missing what hes saying
cold air is definitly a lot healthier then when warm, your engine just has a knack for liking the cold
so does my intercooler
10-18-2006, 02:51 PM
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Re: Car runs better cold (Mr. Em1)
what type of intake do you have? If it's a short-ram (aka hot air intake) it would make sense that when the underhood temps go up the car runs slower.
10-19-2006, 06:10 AM
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Re: (DacBiet)
i think every car runs a little faster at first. the intake manifold will be cold,and the engine bay in general will be cold,thus making the air the car is sucking in colder. put your hand on your intake mani before you drive,and then again after 15 mins,i guarantee you wont be able to hold it ther for long the second time round.
10-19-2006, 07:17 AM
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Re: Car runs better cold (Mr. Em1)
I know exactly what you mean. When I first begin to drive my car from cold start it feels like it has more torque than later on after its at operating temp. I have no explanation.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by egsir2 »</TD></TR><TR><TD CLASS="quote">i think every car runs a little faster at first. the intake manifold will be cold,and the engine bay in general will be cold,thus making the air the car is sucking in colder. put your hand on your intake mani before you drive,and then again after 15 mins,i guarantee you wont be able to hold it ther for long the second time round.</TD></TR></TABLE>
/\/\ That might make sense
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Syndacate »</TD></TR><TR><TD CLASS="quote"> That's why on a dyno they tell you to do it in the evening when the sun's not beating down and heating the air (or as much of it). </TD></TR></TABLE>
Funny because for the most part DynoJets and Mustang dynos are well...inside a garage. I've never heard of strictly dynoing it at night. LMAO
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by egsir2 »</TD></TR><TR><TD CLASS="quote">i think every car runs a little faster at first. the intake manifold will be cold,and the engine bay in general will be cold,thus making the air the car is sucking in colder. put your hand on your intake mani before you drive,and then again after 15 mins,i guarantee you wont be able to hold it ther for long the second time round.</TD></TR></TABLE>
/\/\ That might make sense
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Syndacate »</TD></TR><TR><TD CLASS="quote"> That's why on a dyno they tell you to do it in the evening when the sun's not beating down and heating the air (or as much of it). </TD></TR></TABLE>
Funny because for the most part DynoJets and Mustang dynos are well...inside a garage. I've never heard of strictly dynoing it at night. LMAO
10-20-2006, 10:24 AM
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Re: (Mr. Em1)
Barometric pressure is what makes your car run faster not air temperature. If you watch NHRA Pro Stock Warren Johnson explained it on an interview.
But what I think he's saying is that when it first warms up and he gets on it it feels faster than when it's warmed up and ran over 10 min and he gets on it. It really isn't any faster... it just feels that way. Your mind gets use to it after the 1st time, which makes it feel slower every time after that. It's like if you drive when you're high your car feels really fast compared to when you weren't. LOL.
But what I think he's saying is that when it first warms up and he gets on it it feels faster than when it's warmed up and ran over 10 min and he gets on it. It really isn't any faster... it just feels that way. Your mind gets use to it after the 1st time, which makes it feel slower every time after that. It's like if you drive when you're high your car feels really fast compared to when you weren't. LOL.
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