BFGF

Hi all, Have been surfing this forum for quite a while, and I am so glad that I finally became a 911 owner... : ) Just took delivery last week for a 991 S, and have a quick question for you guys and hope you fellow can help. Do you think the 991 Auto start / stop feature will hurt the starter or engine in a long run? I quite like this feature in stop and go traffic, while waiting at the traffic light ( knowing that she is taking a short break), but does anyone has the knowledge about will it effect the durability of the coil starter or even the engine itself? Thanks again for the input !!

991TurboS

Mine will probably be in great shape because I never use this feature. Hate it. Always creeps me out to have the car stop like that. If you spend $120K + on a car, saving gas is not on my short list.

ipse dixit

Use it for freeway driving as it allows for non intrusive intermittent coasting which is a nice gas saving feature.

Otherwise, leave it off. You own and drive a 911 - emissions and the environment be damned!

wanderfalke

Doesn't this feature have to be activated at start up? Making it impossible to leave it off in traffic and then activate after entering the freeway.

John's 991

Wanderfalke, no you can turn it off and on at will, no problems.

DallasDave

I never use it. I always want my power available and always drive in sport mode. First time I experienced it was in a loaner Panamera and hated it!

Dave in Dallas

Team Plutonium

I turned mine off the second I left the dealership with my car. But no, i doubt it will hurt the engine over time anyway. Although the initial turnover is the most harmful aspect (besides excessive heat) for the motor, all new Porsche engines flood the engine with oil before the first revolution. I've seen it in action with our Cayenne S when it was in the shop and the tech demoed it with the engine cover off - very impressive, and it made me feel pretty good about it. Since the Cayenne S is our daily driver we leave the start/stop function on, but I could't care less about it in my 911...

wanderfalke

I always drive in sport so I need to turn it off on the freeway to engage the glide feature incorporated with auto start stop?

Zohan

I use it all the time, big reason I got a 991 was its efficiency. Start/stop saves about 5% of gas

LexVan

Never use it, since I'm in Sport Plus all the time.

All the UPS trucks I see use this feature. Must be a good reason. Don't worry about your starter. If/when it breaks, buy a new one with your fuel savings account.

Nicky p

Guys, how do you disable the auto turn off feature other than having it in sport mode?

Much appreciated

Team Plutonium

Use the designated button for it.

rpilot

@OP... Doubt it will hurt the engine, the engineers would not have built it otherwise as a standard feature. Standard starters on most of these cars used to have a MTBF rating of 50,000 starts. The cars with auto start / stop tech are equipped with starters that have a MTBF rating of 250,000 starts.

walterwu

My dealer asked during delivery as he was going through the car feature, how I wanted it. He indicated that about 90% buyers want it off.

Whenever an OP question like this comes up, I often try to guess how many posts it takes before someone actually answers the OP's question. I usually put the over/under at around 12-20, because of the old adage, "Rennlisters: always opinionated, sometimes useful". You, sir, are a statistical anomaly!

Money2536

I read somewhere that cars with Auto Stop/Start use an upgraded starter that is designed to handle the extra load of more start-ups. It really doesn't help much in FL as the A/C is always on.