Engine start, drive off IMMEDIATELY??
10-12-2020, 01:11 AM
#1
Engine start, drive off IMMEDIATELY??
The manual specifically states that after starting your engine, you drive off immediately instead of idling. Flat Six Innovation also suggests that to prevent bore scoring you drive off right away.
however, it seems that most of us (including myself!) have a habit of waiting until the hard idle drops to below 1k rpm after engine start. This normally takes 30-40seconds.
i just want to confirm which is the best practice for 997.2? Perhaps the answer differs depending on M97 and 9A1 engines!! I hear both sides and it seems very unclear which is better.
however, it seems that most of us (including myself!) have a habit of waiting until the hard idle drops to below 1k rpm after engine start. This normally takes 30-40seconds.
i just want to confirm which is the best practice for 997.2? Perhaps the answer differs depending on M97 and 9A1 engines!! I hear both sides and it seems very unclear which is better.
Last edited by iipod; 10-12-2020 at 01:15 AM.
Popular Reply
10-12-2020, 10:02 PM
Rennlist Member
I push my car out in the morning to the road, aim it in the direction I want to go, then jump in and twist the key and accelerate while I close the door and I'm off like a Le Mans racer, without any idling at all ("immediately") and of course I do keep it under 3000 until warm.
Kidding aside, we are simply too wrapped up in all of this silly hysteria. Get in, turn it on, and drive out normally. If that means first putting on a seatbelt and adjusting the mirror or you privates then do so while it idles and then pull out and go. Quit worrying. It is silly.
Kidding aside, we are simply too wrapped up in all of this silly hysteria. Get in, turn it on, and drive out normally. If that means first putting on a seatbelt and adjusting the mirror or you privates then do so while it idles and then pull out and go. Quit worrying. It is silly.
10-12-2020, 03:09 AM
#2
Burning Brakes
Right after start all modern engines will run rich to warm up the cats. The worry is the excess fuel will thin the oil coating on the cylinder walls. May make it more prone to bore scoring. Seems like a silly thing to worry about but I'll trust the Flat Six guys advice.
Last edited by Hula; 10-12-2020 at 03:12 AM.
10-12-2020, 03:31 AM
#3
Rennlist Member
My superstition - To start I immediately turn the key to crank her before the computers come up. This provides some start delay and oil sloshing on the cylinder and piston walls so if there is any leak down it will oil up and the hope is that I am avoiding an LSPI event. Jake may shoot holes in this theory...
Then after it starts, I wait for mine to idle down from cat heating, then I drive off keeping it easy until it comes up to temp. Temp means the water temp at 175 and the oil temp off the peg.
Then after it starts, I wait for mine to idle down from cat heating, then I drive off keeping it easy until it comes up to temp. Temp means the water temp at 175 and the oil temp off the peg.
10-12-2020, 10:15 AM
#4
Three Wheelin'
Start the car and go. No reason to idle it.
The following 2 users liked this post by rtl5009:
FlatHat (10-12-2020),
Matt(inMA) (10-15-2020)
10-12-2020, 10:35 AM
#5
RL Community Team
Rennlist Member
Rennlist Member
I wait the 30 seconds for the elevated idle to drop, then drive off. Stay below 3,000 rpm until the oil temp is at 175 and pretty much ignore the coolant temp all the time since it's not a gauge.
The following 4 users liked this post by Petza914:
DesmoSD (10-12-2020),
Hindsight2010 (10-14-2020),
shyamvenky (10-12-2020),
TractControlOff (10-13-2020)
10-12-2020, 11:04 AM
#6
10-12-2020, 11:10 AM
#7
Three Wheelin'
It displays 175 from 160-195
Trending Topics
10-12-2020, 11:18 AM
#8
RL Community Team
Rennlist Member
Rennlist Member
Right, what rtl said. The coolant temp gauge in the 996 actually functioned properly. All the coolant gauges in Porsches since then have been so heavily buffered, they're useless. In my 09 Cayenne Turbo the gauge never moves and the coolant temp gets to 214 F before the cooling fans even kick on. Pay attention to oil temp and only pay attention to coolant temp if it spikes and throws a warning. That means you've lost coolant and are going to overheat and damage the motor.
10-12-2020, 01:50 PM
#9
Three Wheelin'
I turn the key to ACC to get an oil measurement before starting the engine. If the oil level is within the correct level, I'll start the engine. I'll let it idle for about 10-15 secs as I get situated, disconnect the tender, seat memory, radio, air etc. When the idle drops, I'll put it in reverse and back it out of the garage.
The only reason why the manual states to drive immediately is because it's illegal for cars in idle in Germany.
https://www.stuttgartcitizen.com/ann...ar-is-a-no-no/
SPANGDAHLEM AIR BASE, Germany --Letting your engine run idle in the morning is a German traffic law violation in Germany. Over the colder winter months, many people like to turn on their vehicles in the morning, letting the engine run idle. Some people even enjoy going back into the house for a quick cup of coffee, while the engine is running, returning minutes later. In some cases, vehicle owners like to keep the engine running for a few minutes, while scraping the windows. Granted, it may be nice to enter a warm car on a cold winter day, but, unfortunately German law doesn't allow letting engines run idle and people may get fined.
Paragraph 30 of the German Traffic law order states that unnecessary noise and exhaust, coming from vehicles are to be avoided, just like slamming car doors or unnecessary cruising through a closed community, if it becomes an annoyance to residents.
In order to be good neighbor in your host country, base members, residing off base should leave their car engines off in the mornings, until shortly before departure.
Letting your engine run idle is against the law and bad for the environment.
https://www.spangdahlem.af.mil/News/...re%20departure.
The only reason why the manual states to drive immediately is because it's illegal for cars in idle in Germany.
https://www.stuttgartcitizen.com/ann...ar-is-a-no-no/
SPANGDAHLEM AIR BASE, Germany --Letting your engine run idle in the morning is a German traffic law violation in Germany. Over the colder winter months, many people like to turn on their vehicles in the morning, letting the engine run idle. Some people even enjoy going back into the house for a quick cup of coffee, while the engine is running, returning minutes later. In some cases, vehicle owners like to keep the engine running for a few minutes, while scraping the windows. Granted, it may be nice to enter a warm car on a cold winter day, but, unfortunately German law doesn't allow letting engines run idle and people may get fined.
Paragraph 30 of the German Traffic law order states that unnecessary noise and exhaust, coming from vehicles are to be avoided, just like slamming car doors or unnecessary cruising through a closed community, if it becomes an annoyance to residents.
In order to be good neighbor in your host country, base members, residing off base should leave their car engines off in the mornings, until shortly before departure.
Letting your engine run idle is against the law and bad for the environment.
https://www.spangdahlem.af.mil/News/...re%20departure.
The following 2 users liked this post by BucketList:
DesmoSD (10-12-2020),
PowderJunkie (10-12-2020)
10-12-2020, 03:11 PM
#11
Rennlist Member
I never really think about whether I should wait or immediately drive away. I get in my car, and whenever I'm ready to go, that's when I take off. Sometimes its right way, sometimes I need to get directions, etc.
I think you are fine either way. Even if you take off immediately, unless you aren't going to stop at all for the first couple of minutes, wouldn't your car idle high until it warms up anyway?
I think you are fine either way. Even if you take off immediately, unless you aren't going to stop at all for the first couple of minutes, wouldn't your car idle high until it warms up anyway?
10-12-2020, 03:56 PM
#12
Rennlist Member
Since installing long tube headers the car has a nice gurgling note on cold start idle so yes I am guilty of setting in the garage a minute listening to the car idle at 1000 RPM.
The following users liked this post:
cringely (10-15-2020)
10-12-2020, 04:55 PM
#13
Nordschleife Master
Join Date: Oct 2015
Location: Zuffenhausen, Georgia
Posts: 5,371
Received 1,917 Likes
on
1,048 Posts
The side effects of cold start enrichment is a contributor to cylinder bore scoring. IMHO, get in the car, start it up, put on your seatbelt and drive off conservatively (under 3000 rpm) until proper temps are achieved. Then, open it up and have a ball! 
The following 2 users liked this post by ZuffenZeus:
CHICKENHAWK (10-17-2020),
jibmaster1 (10-13-2020)
10-12-2020, 05:59 PM
#14
This. Exactly this.
10-12-2020, 06:10 PM
#15
Three Wheelin'
Other Porsche models have reported bore scoring.
https://rennlist.com/forums/panamera...r-scoring.html
https://rennlist.com/forums/porsche-...nt-needed.html