This car really hates the cold weather

[Subie]

Originally Posted by Exhaust

How exactly do you achieve this? Accelerating while not under load?

Floor the go pedal...

[Exhaust]

Originally Posted by Subie

Floor the go pedal...

Basically overevving..?

[Subie]

Originally Posted by Exhaust

Basically overevving..?

WOT has nothing to do with the engine RPM. All it means is that the butterfly valve in the throttle body is perpendicular to the opening, or wide open. On older cars with cable-linked throttles, pushing the gas pedal to the floor would open that valve fully. On more modern cars with electronic throttles, pushing the gas pedal to the floor will almost certainly result in the same thing, even if at other pedal positions the input does not produce a linear response.

[Craig]

Originally Posted by jlu

I've noticed that after driving through the hills in cold weather, it seems as if the car seems to lose power. It'll take longer to hit the higher RPMs and just feels sluggish overall. This is usually accompanied by difficulty starting up or very weak start-ups. Does anyone else have this problem?

That's what I was describing in my original post, it appears that the cold sucks some of the life out of the car for much longer than it had in my previous/other cars i've driven.

[Exhaust]

Originally Posted by Subie

WOT has nothing to do with the engine RPM. All it means is that the butterfly valve in the throttle body is perpendicular to the opening, or wide open. On older cars with cable-linked throttles, pushing the gas pedal to the floor would open that valve fully. On more modern cars with electronic throttles, pushing the gas pedal to the floor will almost certainly result in the same thing, even if at other pedal positions the input does not produce a linear response.

Sorry to thread jack OP, but I have a hard time understanding this as (in my knowledge) pushing the gas pedal to the floor increases RPM, so how is it not related?

[ST185RC]

Originally Posted by Exhaust

Sorry to thread jack OP, but I have a hard time understanding this as (in my knowledge) pushing the gas pedal to the floor increases RPM, so how is it not related?

Wide open throttle opens up the throttle body to allow the maximum flow into the manifold. While more air enters the manifold and the cylinder the car pumps in more air fuel mixture to build revs. Increasing RPM is more dependent on gearing and road speed. That is you can be off the throttle completely but the engine will still be firing and running. Rpms will also build while going downhill without throttle input, given that the gear is engaged.

This is apparent when the car is in top gear and you floor it. Rpms build very slowly. Compare this with first gear, where its at the gear's speed limit. Doesnt take a lot of throttle to get the rpms to climb further more quickly.

The engine cylinder firing is an indirect effect of having the throttle depressed. The ecu just measures the air that you are letting in and adds fuel and spark timing.

[Exhaust]

Originally Posted by ST185RC

Wide open throttle opens up the throttle body to allow the maximum flow into the manifold. While more air enters the manifold and the cylinder the car pumps in more air fuel mixture to build revs. Increasing RPM is more dependent on gearing and road speed. That is you can be off the throttle completely but the engine will still be firing and running. Rpms will also build while going downhill without throttle input, given that the gear is engaged.

This is apparent when the car is in top gear and you floor it. Rpms build very slowly. Compare this with first gear, where its at the gear's speed limit. Doesnt take a lot of throttle to get the rpms to climb further more quickly.

The engine cylinder firing is an indirect effect of having the throttle depressed. The ecu just measures the air that you are letting in and adds fuel and spark timing.

What I was getting at when posting about increased RPM is when you push the "go peddle" the RPM via tachometer sweeps across till however long. What I dont understand is how is WOT unrelated to RPM when pushing the go peddle increases the RPM via tachometer? It doesnt make sense to me, mainly because I cant tie the the actual function behind them. What is the difference between WOT and RPM? I'm super basic when it comes to cars, but I want to learn and that is why I ask and I feel real stupid asking this but I'm doing it anyway for myself and the next guy. Basically I'm having a hard time understanding how WOT is achieved when you guys say RPM and WOT are unrelated when in my eyes, when I push the gas peddle RPM's go up via tachometer. You can PM me if this is getting too off topic.

[OrbitalEllipses]

Originally Posted by Exhaust

What I was getting at when posting about increased RPM is when you push the "go peddle" the RPM via tachometer sweeps across till however long. What I dont understand is how is WOT unrelated to RPM when pushing the go peddle increases the RPM via tachometer? It doesnt make sense to me, mainly because I cant tie the the actual function behind them. What is the difference between WOT and RPM? I'm super basic when it comes to cars, but I want to learn and that is why I ask and I feel real stupid asking this but I'm doing it anyway for myself and the next guy. Basically I'm having a hard time understanding how WOT is achieved when you guys say RPM and WOT are unrelated when in my eyes, when I push the gas peddle RPM's go up via tachometer. You can PM me if this is getting too off topic.

WOT refers to the position of the butterfly plate in the throttle-body. RPM is related to this since you're cramming more air into the cylinders, but RPM is NOT a measurement of how open the butterfly plate in the throttle body is.

Closed throttle body:


"WOT":


When you step on the skinny pedal, this is what you're doing: [ame="http://www.youtube.com/watch?v=T9_VbMC9ctM"]Silverado throttle body polished - YouTube[/ame]

In a traditional cable-driven application, the pedal actuates the butterfly by way of a cable that acts on a lever. In a drive-by-wire application pressing on the skinny pedal sends an electrical signal of varying strength (depending on how far you press the pedal) that activates a motor that in turn acts on the butterfly.

[foxhu]

Originally Posted by Shit Luck

My manual trans car doesn't like to start when I leave it sit out in the cold at work.
It cranked for a solid 7 seconds last night before firing.

Happen to me this morning lol it was 20 degrees at my area... I had to start the car twice.
I normally don't wait for the car to heat up. I only wait until it drop down to 1.1rmp or so. when the car started it goes up around 1.5-1.6 rmp then down to 1.1 in around a min(sometime if it's cold it'll take maybe 3-5 min) then i just drive.

[Steve]

Originally Posted by FRSFirestorm

Yesterday after initial start it backfired 2 or 3 times through the intake right after starting.

I believe mine is doing the same thing when the temperature is lowest, like this week, sometimes half a dozen backfires right after start up. Not sure if this is something to be concerned about?

[russv]

Sure glad my FRS lives in California.

[pheoxs]

Started my FRS in -20 ... fired up with no hesitation or anything, let it idle while i walked around and closed the garage door and drove off.

Purr'd like a kitten with no issues.

[jesperswe]

Let it idle for 10mins? I go out, start my car and just drive away, that's how cars are supposed to be used, even in the winter. Just drive it gently, if i had to idle my car 10mins before going to drive, i'd give the car back to the stealership.

The only cold problems I have, the window who freezes every damn day and a really hard 2nd gear (untill it's warmed up).

[Exhaust]

Originally Posted by OrbitalEllipses

WOT refers to the position of the butterfly plate in the throttle-body. RPM is related to this since you're cramming more air into the cylinders, but RPM is NOT a measurement of how open the butterfly plate in the throttle body is.


In a traditional cable-driven application, the pedal actuates the butterfly by way of a cable that acts on a lever. In a drive-by-wire application pressing on the skinny pedal sends an electrical signal of varying strength (depending on how far you press the pedal) that activates a motor that in turn acts on the butterfly.

Your post was a huge help, kinda feel foolish after seeing how it worked but it all makes perfect sense now. Thanks buddy.