my99 - Quick when cold
Simon,
you should not push your car hard when the engine is cold, especially not within the first two miles if possible. More than 90% of engine wear occurs when the engine is cold, and the oil hasn't reached optimum working temperature etc, and if you stress the engine regularly when cold, then you can expect reduced engine life, and poorer performance in the months and years to come....
you should not push your car hard when the engine is cold, especially not within the first two miles if possible. More than 90% of engine wear occurs when the engine is cold, and the oil hasn't reached optimum working temperature etc, and if you stress the engine regularly when cold, then you can expect reduced engine life, and poorer performance in the months and years to come....
Scooby Newbie
Joined: Oct 2000
Posts: 2
Likes: 0
My standard 99 car is noticably quicker & has more torque when cold (first 2 miles) than when it gets warm. I guess that this is down to rich fueling for a cold start. Does anyone know how to get it to drive like this all the time ? - It feels like anothe 50bhp in the morning !!
Cheers
Cheers
Simon,
there shouldn't really be any difference in performance between hot and cold. The ambient temperature and conditions make a noticeable difference.
On the very rare occasion when I have used boost when the engine was cold, it wasn't any faster than normal.
I would suggest that you may have a problem with one of the sensors, and you should take it along to your nearest dealer and ask them check it out, nd fix it under warranty.
there shouldn't really be any difference in performance between hot and cold. The ambient temperature and conditions make a noticeable difference.
On the very rare occasion when I have used boost when the engine was cold, it wasn't any faster than normal.
I would suggest that you may have a problem with one of the sensors, and you should take it along to your nearest dealer and ask them check it out, nd fix it under warranty.
Scooby Regular
Joined: Feb 2000
Posts: 173
Likes: 0
John et al,
It IS possible for the car to feel quicker 1st thing in the morning due to the 'closed-loop control' in the ECU.
This works basically like the choke on a carburretor used to; ie, provide the engine with a richer mixture on cold start. The difference is more noticeable on an Impreza because it is a turbo and can provide more boost due to more fuel going in the other end.
All modern fuel-injected cars have this system, you probably just didn't notice it before.
Good advice about being careful with the engine until it warms though...
Rob.
It IS possible for the car to feel quicker 1st thing in the morning due to the 'closed-loop control' in the ECU.
This works basically like the choke on a carburretor used to; ie, provide the engine with a richer mixture on cold start. The difference is more noticeable on an Impreza because it is a turbo and can provide more boost due to more fuel going in the other end.
All modern fuel-injected cars have this system, you probably just didn't notice it before.
Good advice about being careful with the engine until it warms though...
Rob.
Scooby Regular
Joined: Mar 2000
Posts: 139
Likes: 0
Simon,
I am new to these wonderful devices... but this is what I see. (ie I could well be talking 'bird stuff that makes your paint-work bad')
One thing I have noticed on previous lower powered cars I've had is on a cold damp misty morning it would make a noticable difference to the car (faster) - density of the air and a humidity etc giving a bigger 'bang' from the spark etc ... but I guess you know all that stuff already.
I've not noticed it on the Scooby - but I've never had it above 3000rpm when cold/lukewarm. RobMac has given us the actual technical Scooby info here though.
Once the standard water temp gauge is showing that the engine is at normal temp ... I reckon the car is still not ready for booting it fully (thats if you want your engine bits to last)! I guess an oil temp gauge would be handy here?
Of course if you had an engine heater the warm up time is greatly reduced ... but unfortunately that is far too boring mod to put on a Scoob ....
Swa ....(its getting hot wearing this sodding coat all the time!)
I am new to these wonderful devices... but this is what I see. (ie I could well be talking 'bird stuff that makes your paint-work bad')
One thing I have noticed on previous lower powered cars I've had is on a cold damp misty morning it would make a noticable difference to the car (faster) - density of the air and a humidity etc giving a bigger 'bang' from the spark etc ... but I guess you know all that stuff already.
I've not noticed it on the Scooby - but I've never had it above 3000rpm when cold/lukewarm. RobMac has given us the actual technical Scooby info here though.
Once the standard water temp gauge is showing that the engine is at normal temp ... I reckon the car is still not ready for booting it fully (thats if you want your engine bits to last)! I guess an oil temp gauge would be handy here?
Of course if you had an engine heater the warm up time is greatly reduced ... but unfortunately that is far too boring mod to put on a Scoob ....
Swa ....(its getting hot wearing this sodding coat all the time!)
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