Do you feel more torque when engine is cold?

[zycha]

I feel more torque in low and middle when drive with just started engine after the night or when the temp only reach lift value.
Do you? I have stock air intake and ECU.
Is it air intake related or because cold engine uses more rich mix?
If it is mix related, can I with PFC leave A/F on this value?

[xantonin]

Well, the engine tries to spin faster to heat up quicker, I think... May be that?

[supergoat]

When you first start it and the engine is cold you will defiintly feel more power. The cold enigne isn't heating up the entire engine bay yet causing the incoming air to get hotter and less dense.

Fwiw, I try NOT to drive my cold engine hard. You want the coolant and oil to get to operating temop before really getting on it. Especially the oil.

[zycha]

When you first start it and the engine is cold you will defiintly feel more power. The cold enigne isn't heating up the entire engine bay yet causing the incoming air to get hotter and less dense.

Fwiw, I try NOT to drive my cold engine hard. You want the coolant and oil to get to operating temop before really getting on it. Especially the oil.
no, I dont drive hard, but I feel appreciable increase of torque from low to 3500-4000RPM.

[mofojoe]

well, when the engine is cold the coolant system doesn't engage until the thermostat wax melts, so the water pump isn't running.

That takes away "some" power from the engine output, but i dunno if it's that noticeable.

[redborja202]

when the engine is cold, there's prolly less resistance to turn the crank... considering that the pistons, bearings yada yada yada are not hot yet, hence not expanding yet, hence more clearance between parts... plus colder air going in...

[mofojoe]

hmm dunno about resistance, cuz when the engine first turns over the oil is lifted up the piston shaft for proper oil disperssion. But oil works best at certain operating temperatures, usually 80-90 Celcius for gasoline engines, at which it reaches optimal viscosity. When the engine is cold however, this point is not yet reached and it's more thick syrup.

Who wants to volunteer to crunch the numbers, or just google it, it's probobly been done 100 times over

[lVlemphizStylez]

the reason its quicker is because the IAT's are much lower...Same concept behind why you lose power due to heatsoak...If the air you're taking in is cooler (more dense) you're going to make more power...When the engine is warmed up, the parts have considerable more heat on them, therefore raising the temperature of the air you're taking in (convection)...Some of these reasonings in here are hilarious though...BTW don't beat on your car before it's warmed up...You may be posting in the repair section soon "Car is drinking oil"

[xantonin]

the reason its quicker is because the IAT's are much lower...Same concept behind why you lose power due to heatsoak...If the air you're taking in is cooler (more dense) you're going to make more power...When the engine is warmed up, the parts have considerable more heat on them, therefore raising the temperature of the air you're taking in (convection)...Some of these reasonings in here are hilarious though...BTW don't beat on your car before it's warmed up...You may be posting in the repair section soon "Car is drinking oil"
That sucks because when I'm late for work I gotta drive hard lol... Any suggestions?

[lVlemphizStylez]

Start the car ahead of time and give it 3 mins to warm up a bit...I don't drive off on my car in the mornings (never did)..I'll start it let it warm up a bit then go

[xantonin]

Start the car ahead of time and give it 3 mins to warm up a bit...I don't drive off on my car in the mornings (never did)..I'll start it let it warm up a bit then go

I would if I didn't live in an apartment and afraid my neighbors will jump in and drive off, haha.

How about keeping RPMs below 3k?

Or is it better to be higher? I noticed on my auto '95 Celica it wouldn't shift into 4th gear when it was cold. So it would keep the RPMs higher before shifting... I thought it was to warm up.

[lVlemphizStylez]

If you must drive it cold...Don't keep the RPMS high...especially not above 3k...Just drive it normally...It'll warm up on its own..I live in an apartment too..I just start the car and give it about 3 mins while I'm inside the car...But that's just me

[xantonin]

If you must drive it cold...Don't keep the RPMS high...especially not above 3k...Just drive it normally...It'll warm up on its own..I live in an apartment too..I just start the car and give it about 3 mins while I'm inside the car...But that's just me

I see, good idea. I'll wake up earlier. :D

[Blue Bomber]

when the engine is cold, there's prolly less resistance to turn the crank... considering that the pistons, bearings yada yada yada are not hot yet, hence not expanding yet, hence more clearance between parts... plus colder air going in... Actually, there should be a lot more. The oil is much thicker, and will just stick to all moving parts instead of being shed off like water when it's hot. Not to mention the oil pump will have full pressure to work against for a while till the oil thins out.

[Pulsar1]

My car has always been alot more sluggish until it warms up, same with my buddies celica....

[JSPITZ]

I feel more torque when I drive my uncles camry.

[slidr]

well, when the engine is cold the coolant system doesn't engage until the thermostat wax melts, so the water pump isn't running.

That takes away "some" power from the engine output, but i dunno if it's that noticeable.


The water pump is always operating, it's powered by the drive belt.



the reason its quicker is because the IAT's are much lower...Same concept behind why you lose power due to heatsoak...If the air you're taking in is cooler (more dense) you're going to make more power...When the engine is warmed up, the parts have considerable more heat on them, therefore raising the temperature of the air you're taking in (convection)...Some of these reasonings in here are hilarious though...BTW don't beat on your car before it's warmed up...You may be posting in the repair section soon "Car is drinking oil"


The ECU will operate in an open loop until the car gets warmed up, ignoring the O2 sensor readings. No way you are getting more power out of a cold engine unless you are using standalone engine management and the car is out of tune.

Start the car ahead of time and give it 3 mins to warm up a bit...I don't drive off on my car in the mornings (never did)..I'll start it let it warm up a bit then go

I would if I didn't live in an apartment and afraid my neighbors will jump in and drive off, haha.

How about keeping RPMs below 3k?

Or is it better to be higher? I noticed on my auto '95 Celica it wouldn't shift into 4th gear when it was cold. So it would keep the RPMs higher before shifting... I thought it was to warm up.

You want to have the RPMs around 3-4k until the engine fully warms up. You want the engine to reach operating temps as soon as possible. The vast majority of engine wear occurs at startup, not because of lack of oil on moving parts, but because of acidity due to combustion left on moving parts of the engine after it's shut off.

[xantonin]

I see, good information thanks. Also, engines warm up way more when there is load right? So isn't it better to drive than idle for a bit to warm up?

[zycha]

I see, good information thanks. Also, engines warm up way more when there is load right? So isn't it better to drive than idle for a bit to warm up?
in winter -yes.
But many manufacturers say that new engines you do not not need to warm during cold days. But I think it is better to warm up especially when is very cold as -10...-20C.

P.S. It is not very possible to sit on so cold leather :) celica su*** without heated seats and mirrors.

[silverCELICAgt-s]

Haha, torque?.... your not talking about the celica right?
:laugh:

[themuffinman]

the reason its quicker is because the IAT's are much lower...Same concept behind why you lose power due to heatsoak...If the air you're taking in is cooler (more dense) you're going to make more power...When the engine is warmed up, the parts have considerable more heat on them, therefore raising the temperature of the air you're taking in (convection)...Some of these reasonings in here are hilarious though...BTW don't beat on your car before it's warmed up...You may be posting in the repair section soon "Car is drinking oil"
That sucks because when I'm late for work I gotta drive hard lol... Any suggestions?


remote start? thats why i have it for... that and cold leather sucks... HEATED SEATS FTW.

[xantonin]

I'm getting mixed results.

A) Everyone says to not drive hard when the engine is cold.
B) But drive around 3k-4k? So Don't shift till 4k? Isn't that hard?

[dapsteez]

Haha, torque?.... your not talking about the celica right?
:laugh:


Torque? What's torque?

[zycha]

Haha, torque?.... your not talking about the celica right?
:laugh:
no, about boeng 747 ;)

[xantonin]

You want torque? http://www.automotoportal.com/article/volkswagen-touareg-successfully-tows-a-boeing-747

[Kore971]

DAAMN!!!!! :applaud:

[2way]

well, when the engine is cold the coolant system doesn't engage until the thermostat wax melts, so the water pump isn't running.

That takes away "some" power from the engine output, but i dunno if it's that noticeable.


The water pump is always operating, it's powered by the drive belt.:werd:



the reason its quicker is because the IAT's are much lower...Same concept behind why you lose power due to heatsoak...If the air you're taking in is cooler (more dense) you're going to make more power...When the engine is warmed up, the parts have considerable more heat on them, therefore raising the temperature of the air you're taking in (convection)...Some of these reasonings in here are hilarious though...BTW don't beat on your car before it's warmed up...You may be posting in the repair section soon "Car is drinking oil"


The ECU will operate in an open loop until the car gets warmed up, ignoring the O2 sensor readings. No way you are getting more power out of a cold engine unless you are using standalone engine management and the car is out of tune.Not exactly true... the ECU does run richer under cold and initial start conditions.

[GSBoek]

I'm getting mixed results.

A) Everyone says to not drive hard when the engine is cold.
B) But drive around 3k-4k? So Don't shift till 4k? Isn't that hard?
Not really mixed results, they're basically saying the same. Whether you take it to 3k or up to 4k when cold is personal choice though. 4k is far from hard on the engine I'd consider 5k up as really hard driving.

My personal practice is I startup and let it idle for 2-3 minutes, after that as the idle drops to 1.2-1.3k I give the engine few tiny revs to 1.6-1.7k and I start rolling out, usually right at the point where the needle goes up one click. From then I keep revs up to 3k until the needle gets to the second click. On the second click I rarely take it over 4-4.5k if need be, but usually keep shifting around 3-3.5k anyway. I only rev higher than 4.5k when engine is at operating temperature.

[zycha]

You want torque? http://www.automotoportal.com/article/volkswagen-touareg-successfully-tows-a-boeing-747
OFFT: you are comparing celi vs V10? :eek:
my celi can the same.. i just need proper transmission :burnout: :D