Evo Warm up Time?
Evo Warm up Time?
Hey I am looking at getting an evo next month got some money set aside and I got a random question?
How long do you let your Evo warm up before you drive it?
Do you drive and no turbo
or do you let it warm up for a while
How long do you let your Evo warm up before you drive it?
Do you drive and no turbo
or do you let it warm up for a while
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Joined: Jul 2003
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From: New Orleans Area
I start mine and it runs for a few minutes. I usually start driving it and just don't boost until the gauge reads around 50 celsius on the oil temp. I think the most important thing is to get is to just get everything up to temp before any hard driving.
haha same as someone said i remotre start 10 min before i leave and runs like a champ... but if i dont i start it and let it sit for like 2 min then runs like **** for the net min so just no nboost
Let it idle for a couple of minutes then take it easy on the roads until the temp gauge goes to the center, then let her rip! Just keep off boost while she is cold. Same procedure for the cool down. Stay off boost towards the end of your journey and if possible let the car idle afterward for a few minutes.
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It depends on the ambient temperature. The worst part of cold startup is the few seconds before oil pressure builds at all the bearings, sliding surfaces, and at the turbo. In the Evo its about 3 seconds before oil pressure stabilizes at bearings.
Technically speaking, once there is oil pressure at all the moving parts, you can start driving immediately. There is no real technical advantage of letting the vehicle idle until it reaches operating temperature. Speaking as an engineer specializing in engine design and calibration, letting a vehicle idle for more than a minute is just wasting gas and will give no benefit whatsoever.
That said, special care must be given to turbo engines. You should not get into boost until the oil has reached operating temp of at least 150-160F (appx. 60-70 C). This is simply a precaution to ensure that oil is not still too viscous (due to cold) to properly lubricate the high speed bearing of the turbo shaft.
Small displacement high output forced induction motors like the 4G63 are also built relatively loose. Meaning the clearance gaps between the pistons and the cylinder walls are slightly larger than normal to compensate for extremely high heat loads and the thermal expansion of the pistons in the cylinders when the engine is under high boost and high load. As a result of this design, there is a slightly higher amount of blowby (unburned fresh charge) that can get past the piston rings and into the crankcase during the first few seconds before the pistons heats up and expands.
Having a oil temperature gauge is very useful in this regard. The engine coolant temp that comes stock in the Evo is NOT an indicator of oil temperature. In fact, the oil temperature lags far behind the coolant temperature as the engine warms up. So just because the coolant gauge reads engine is at operating temp, DOES NOT mean that oil is also at operating temp.
The reverse is true for hot shutdown. Don't thrash the car under heavy boost and high loads and then drive into the garage and shut it off. If you have just finished a very strenuous driving session (like a track day session). Open the hood, and let the car idle for 10 minutes. This will allow everything to return to normal operating temperatures slowly. Shutting it off hot, will mean the very hot, low viscosity oil will drain out of the turbo quickly leaving its to warp itself from its own heat. Running the engine will allow the engine to pump both oil and coolant through the turbo.
The summary of all this? Start the car, but do not rev it immediately (and risk metal on metal wear), let the oil pressure stabilize. 10 seconds should be more than enough (having a oil pressure gauge is a great idea as well 90-100psi on cold startup at idle). Then you can begin driving, but keep the revs below 3k and stay out of boost until the oil temps have reached above 160F (idle pressure should be around 10-15psi at operating temp). Only then should you get into boost.
Technically speaking, once there is oil pressure at all the moving parts, you can start driving immediately. There is no real technical advantage of letting the vehicle idle until it reaches operating temperature. Speaking as an engineer specializing in engine design and calibration, letting a vehicle idle for more than a minute is just wasting gas and will give no benefit whatsoever.
That said, special care must be given to turbo engines. You should not get into boost until the oil has reached operating temp of at least 150-160F (appx. 60-70 C). This is simply a precaution to ensure that oil is not still too viscous (due to cold) to properly lubricate the high speed bearing of the turbo shaft.
Small displacement high output forced induction motors like the 4G63 are also built relatively loose. Meaning the clearance gaps between the pistons and the cylinder walls are slightly larger than normal to compensate for extremely high heat loads and the thermal expansion of the pistons in the cylinders when the engine is under high boost and high load. As a result of this design, there is a slightly higher amount of blowby (unburned fresh charge) that can get past the piston rings and into the crankcase during the first few seconds before the pistons heats up and expands.
Having a oil temperature gauge is very useful in this regard. The engine coolant temp that comes stock in the Evo is NOT an indicator of oil temperature. In fact, the oil temperature lags far behind the coolant temperature as the engine warms up. So just because the coolant gauge reads engine is at operating temp, DOES NOT mean that oil is also at operating temp.
The reverse is true for hot shutdown. Don't thrash the car under heavy boost and high loads and then drive into the garage and shut it off. If you have just finished a very strenuous driving session (like a track day session). Open the hood, and let the car idle for 10 minutes. This will allow everything to return to normal operating temperatures slowly. Shutting it off hot, will mean the very hot, low viscosity oil will drain out of the turbo quickly leaving its to warp itself from its own heat. Running the engine will allow the engine to pump both oil and coolant through the turbo.
The summary of all this? Start the car, but do not rev it immediately (and risk metal on metal wear), let the oil pressure stabilize. 10 seconds should be more than enough (having a oil pressure gauge is a great idea as well 90-100psi on cold startup at idle). Then you can begin driving, but keep the revs below 3k and stay out of boost until the oil temps have reached above 160F (idle pressure should be around 10-15psi at operating temp). Only then should you get into boost.
Last edited by ktk; Mar 13, 2009 at 08:36 PM.
