Auto stop VS restart - Honda CRZ Forum: Honda CR-Z Hybrid Car Forums

wkqkqkfk · 02-23-2011, 05:50 PM

Waiting in a long carwash line kept me thinking, is auto stop same as restart? Stop and go line doesnt do auto stop after one restart since it needs to reach 15km/h to activate auto start again. I know that your trip computer will freak out and give you very bad score but will it damage the engine or use up more gas if i just turn the key off and on? Thanks

Scotty001 · 02-23-2011, 05:59 PM

Quote:

Originally Posted by wkqkqkfk

Waiting in a long carwash line kept me thinking, is auto stop same as restart? Stop and go line doesnt do auto stop after one restart since it needs to reach 15km/h to activate auto start again. I know that your trip computer will freak out and give you very bad score but will it damage the engine or use up more gas if i just turn the key off and on? Thanks

Though it doesn't always work, my autostop - for the most part - will re-engage fairly easily without having to hit the 15km/h. Example: While in a drive through it will initially stop of course, I let off the brake move forward a bit as the line moves, hit the brake and it will engage (unless I got too many environmentals going) and so on. I'm in a CVT.

Definitely will mess with your ECO score if idling for too long. Turning the car off on long stops, my advice is yes it will save gas of course and no will not damage engine. One of the reasons for the 00-20 oil.

ErikTheRed · 02-23-2011, 06:06 PM

Just like with Scotty I have a CVT and my autostop reengages if I just move forward by about 6 ft or so. I got the hang of it one day when waiting in line at the drive thru, just let the car in front of you move up far enough then I roll up so that the autostop will work again. Its up to you that path you want to go but if you cant get autostop to work right then just shut off the car, no harm that way.

wkqkqkfk · 02-23-2011, 06:13 PM

Hmm i think its abit different on 6speed manual. It never dies down on slow stop and go.. Ive been turning the engine on and off but i thought it's not good for the car since auto stop just kills the engine where shutting off kills everything. I know restarting on regular gas cars are bad for the car and gas consumption on restart.

ErikTheRed · 02-23-2011, 06:16 PM

I believe in the CR-Z starting the engine works the same as autostop, starts the engine with the assist of the IMA so it shouldnt be to harsh on the engine but I could be wrong

Scotty001 · 02-23-2011, 06:36 PM

Quote:

Originally Posted by ErikTheRed

I believe in the CR-Z starting the engine works the same as autostop, starts the engine with the assist of the IMA so it shouldnt be to harsh on the engine but I could be wrong

Yes, I believe this is the case. Engine is designed for this and as stated before, it is the one of the reasons for the 00/20 Oil.

Older or other cars with the heavier wieght/thicker oils and conventional starters, might not be a good idea. Probably arguable either way though.

Diversion · 03-14-2011, 06:09 PM

After doing some research - the fact that the electric motor acts as our "starter".. there should be no damage starting and stopping of the motor.. over and over.. The electric motor actually spins the internals up to 1500 rpms or so and then fires it up.. doing this, there's no wasted fuel/spark like there is on a traditional starter.. There should be basically zero long-term weardown in this situation.

But on a traditional motor/starter setup - you're going to wear out your starter and wear out your pistons from repetitive shutting down and starting up. You're using combustion to gain momentum as the starter can't spin your motor up as fast and smooth as the electric motor can in a hybrid.

Hope this makes sense/helps.. and keep in mind the CR-Z can start up the engine using a traditional "backup" starter if your electric motor somehow fails.. In this case, the ECU will be in a gas only mode and disable all charging and auto-stop features.

Ludercrz · 03-14-2011, 07:32 PM

^ good info.

brent_w · 03-15-2011, 03:42 PM

Quote:

Originally Posted by wkqkqkfk

Hmm i think its abit different on 6speed manual. It never dies down on slow stop and go.. Ive been turning the engine on and off but i thought it's not good for the car since auto stop just kills the engine where shutting off kills everything. I know restarting on regular gas cars are bad for the car and gas consumption on restart.

I've had my 6speed autostop multiple times in a drive thru without hitting 15km.

But it doesn't happen all the time and I'm not entirely sure what does or doesn't cause it in that situation.

GoHuskies · 03-15-2011, 03:57 PM

I'd only be concerned with how the cars ECU handles the fuel rich open cycle warm up mode. If your turn the car off then restart you may be running a bit fuel rich for a brief time as part of an automatic warmup procedure.

In real world use hyper-milers have used this technique for years on a variety of cars without issue.

02-23-2011, 05:50 PM	#1 (permalink)
wkqkqkfk Senior Member Join Date: Nov 2010 Location: Ottawa,ON Posts: 520	Auto stop VS restart Waiting in a long carwash line kept me thinking, is auto stop same as restart? Stop and go line doesnt do auto stop after one restart since it needs to reach 15km/h to activate auto start again. I know that your trip computer will freak out and give you very bad score but will it damage the engine or use up more gas if i just turn the key off and on? Thanks __________________

02-23-2011, 06:06 PM	#3 (permalink)
ErikTheRed Senior Member Join Date: Jan 2011 Location: San Diego, CA Posts: 246	Just like with Scotty I have a CVT and my autostop reengages if I just move forward by about 6 ft or so. I got the hang of it one day when waiting in line at the drive thru, just let the car in front of you move up far enough then I roll up so that the autostop will work again. Its up to you that path you want to go but if you cant get autostop to work right then just shut off the car, no harm that way. __________________ Pearl White CR-Z EX w/ Navi #9297

02-23-2011, 06:13 PM	#4 (permalink)
wkqkqkfk Senior Member Join Date: Nov 2010 Location: Ottawa,ON Posts: 520	Hmm i think its abit different on 6speed manual. It never dies down on slow stop and go.. Ive been turning the engine on and off but i thought it's not good for the car since auto stop just kills the engine where shutting off kills everything. I know restarting on regular gas cars are bad for the car and gas consumption on restart. __________________

02-23-2011, 06:16 PM	#5 (permalink)
ErikTheRed Senior Member Join Date: Jan 2011 Location: San Diego, CA Posts: 246	I believe in the CR-Z starting the engine works the same as autostop, starts the engine with the assist of the IMA so it shouldnt be to harsh on the engine but I could be wrong __________________ Pearl White CR-Z EX w/ Navi #9297

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03-14-2011, 06:09 PM	#7 (permalink)
Diversion Junior Member Join Date: Mar 2011 Location: Jacksonville, FLorida Posts: 15	After doing some research - the fact that the electric motor acts as our "starter".. there should be no damage starting and stopping of the motor.. over and over.. The electric motor actually spins the internals up to 1500 rpms or so and then fires it up.. doing this, there's no wasted fuel/spark like there is on a traditional starter.. There should be basically zero long-term weardown in this situation. But on a traditional motor/starter setup - you're going to wear out your starter and wear out your pistons from repetitive shutting down and starting up. You're using combustion to gain momentum as the starter can't spin your motor up as fast and smooth as the electric motor can in a hybrid. Hope this makes sense/helps.. and keep in mind the CR-Z can start up the engine using a traditional "backup" starter if your electric motor somehow fails.. In this case, the ECU will be in a gas only mode and disable all charging and auto-stop features.