Subaru Crosstrek and XV Forums banner

That Annoying Engine Shut-off

4198 Views 182 Replies 41 Participants Last post by  AJR
Anyone who has ever had the experience of forgetting to press the magic button and having the car shut off just as one presses the gas pedal knows the feeling. It's like sitting atop a mountain lion while it coughs up a furball. Apart from being disconcerting one thinks "this just CAN'T be good for the engine."
Does anyone think that if enough of us complained Subaru might offer an optional software upgrade that turns the button into an "on" button with not shutting off the default?
  • Like
  • Love
Reactions: 3
81 - 100 of 183 Posts
I'd like to see some citations on that, because in my experience based on where I drive, there is absolutely no way that a/s/s would save anything close to 4%, let alone 15%. For a car that averages 30 MPG overall, 4% would be 1.2 MPG and 15% would be a ludicrous 4.5 MPG ... not gonna happen ... not unless you are in someplace like NYC and literally stopping for a red light every block at rush hour or something, and probably not even then.

Conversely, we have had plenty of reports right here on this forum of people having to replace batteries prematurely on cars with this "feature." I don't know about starters ... that would seem to be a longer-term problem ... but one I'm not willing to chance. I'll gladly pay the $27 for the eliminator cable and a few pennies more for fuel each fill-up to avoid those headaches (and expenses).
I agree. Even $100 for the eliminator would probably be a good investment if you plan to keep the car longer than the factory warranty.
  • Like
Reactions: 2
There are different types of tunes. Last I checked on Subaru's style, it did NOT advance timing to take advantage of higher octane. Some cars recommend "87 octane minimum", often these will see increased performance if you use higher octane.
  • Like
Reactions: 2
Huh? Not sure I understand. You mean cars with AS/S will come back on when you move the wheel?
Yes exactly. Try it sometime.
I'd like to see some citations on that, because in my experience based on where I drive, there is absolutely no way that a/s/s would save anything close to 4%, let alone 15%. For a car that averages 30 MPG overall, 4% would be 1.2 MPG and 15% would be a ludicrous 4.5 MPG ... not gonna happen ... not unless you are in someplace like NYC and literally stopping for a red light every block at rush hour or something, and probably not even then.
Precisely this is when AS/S will be of most benefit. And if this is the kind of driving you're doing, you're probably getting in the range of 15-20mpg rather than 30. In this case, AS/S could make a big difference. Otherwise, it's negligible
Yes exactly. Try it sometime.
I drive a manual, so I don't have no stinkin' AS/S.
  • Like
Reactions: 2
I drive a manual, so I don't have no stinkin' AS/S.
No f-ing Merlot, either... ;)
  • Like
Reactions: 1
There are different types of tunes. Last I checked on Subaru's style, it did NOT advance timing to take advantage of higher octane. Some cars recommend "87 octane minimum", often these will see increased performance if you use higher octane.
Rather it retards the timing if it detects knock.
Yes exactly. Try it sometime.
So, if you turn the wheel the engine starts up? Why? The power steering is electric, not hydraulic.
Does anyone think that if enough of us complained Subaru might offer an optional software upgrade that turns the button into an "on" button with not shutting off the default?
Zero chance.
  • Like
Reactions: 1
Zero chance.
Less than zero, LOL!
No f-ing Merlot, either... ;)
High end cork sniffing Upstate wine retailer. The "private room" for tasting was bottle side up, entire high end display. I asked, why pay $78.00 for a Barnett Merlot 2019 and it's corked?

Jaw Dropping MGR said:
We have to ask the specialist.
Look, we could buy a glass decanter and pour a BOX of Boto 4 litre merlot and let it sit for 3 hours and get these same results for $19.99 retail USD. Then/if pour the left over -the unconsumed in a clay decanter to age into a get vinegar. A vinaigrette sauce dabbed in the a mustard, onion and garlic from our garden.

Then ™

Been there and dun'it.

____
dictated; not read
People confuse octane rating with power, even purported experts. The octane rating is the ability of the fuel to remain stable under compression. If a car is designed for 87 then, due to its compression ratio, 87 will be fine and there will be no advantages to using a higher octane fuel, it will just cost you more. Performance vehicles, especially turbos like my Lotus, have higher compression ratios so benefit from premium fuel. The performance increase comes from the higher compression ratio, not the fuel itself.

As @MA Subie wrote, if you're experiencing knocking with the recommended fuel then you may have other issues and if not fixed it could cause serious engine damage over time.
Not only will higher octane fuel cost you more, but you will actually have a decrease in power. Higher octane fuel burns slower so using it in a car that is designed for lower octane just means that you are getting less “pow” out of each power stroke.
I doubt you’d notice a difference between 87 and 93, but if you put some 120 in a crosstrek, you might be able to.
Not only will higher octane fuel cost you more, but you will actually have a decrease in power. Higher octane fuel burns slower so using it in a car that is designed for lower octane just means that you are getting less “pow” out of each power stroke.
I doubt you’d notice a difference between 87 and 93, but if you put some 120 in a crosstrek, you might be able to.
Yes, that's also my understanding, as the power doesn't come from the higher octane but from the higher compression that 93 allows. You could try 100LL avgas and see how that works for you, LOL!

You'll need new cats before the next smog check... ;)
So, if you turn the wheel the engine starts up? Why? The power steering is electric, not hydraulic.
I assume the electric power steering would be too much of a draw for the battery alone and would need the alternator.
I assume the electric power steering would be too much of a draw for the battery alone and would need the alternator.
I find that hard to believe, since the battery is there to crank the engine. It can't take that much to turn the wheels. Perhaps the logic is that you're about to set off again and better get the engine started. The more I learn about these AS/S systems the more I dislike them.
So, if you turn the wheel the engine starts up? Why? The power steering is electric, not hydraulic.
Well I didn't design it, so I can only speculate. It seems like if you do anything at all really it turns the engine back on.
  • Like
Reactions: 1
I find that hard to believe, since the battery is there to crank the engine. It can't take that much to turn the wheels.
No, but is there any reason to engage the power steering when the engine isn't running?
No, but is there any reason to engage the power steering when the engine isn't running?
This thread is about AS/S. Maybe you stopped at a light, the engine dies, and you want to turn the wheels because you're about to turn. Since the powered steering is electrical, not hydraulic, it could be powered when the engine is not running. I would expect it to only work with the ignition on. It's all speculation at this point. Perhaps someone could test it?
81 - 100 of 183 Posts
Top