Does your car ever have "slow" days? - Page 2 - Toyota Yaris Forums

1stToyota · 10-05-2009, 06:40 PM

Quote:

Originally Posted by Lafiro

The answer is humidity. Then temperature. Then if the A/C is on.

Test it, next time its really foggy, or raining a lot, you wll notice immediately the car is slower. Same with warmer weather.

And of course the A/C when engaged uses around 20hp.

Really? Around 20hp, just for using the A/C...roughly = to the total drivetrain loss for our Yaris?

CtrlAltDefeat · 09-22-2009, 10:01 PM

Well I've noticed that my car reacts a lot to the air. On cool dry days (when the air is dense and has low humidity) it always seems to have a bit more pep, whereas hot humid days, it's a little slower...

Lafiro · 09-22-2009, 10:14 PM

It really is around 20hp. OBDII reports just that on a live graph, tested it myself on the Yaris, and other cars, and the average was around 20hp for about any car I tested so far.

20hp is resonable, I mean its not like we are pressing down the gas pedal 100% to try and get up to 106crank horse power now are we?
no.

We probably use half the gas pedal, so the remaining power just goes to the a/c compressor. So the light foots don't feel it much, and the heavy feet people, will ALWAYS feel the difference in power. Plain and simple.

Edit:
No one take this the wrong way, I spoke to a few good friends of mine, and they told me whoever says the a/c compressor doesn't slow down the car, and that whoever says, the a/c compressor doesn't change numbers when running a dyno is a retard.
I happen to believe them, and Im sick of people trying to disagree with the TRUTH as if its something that makes them happy.

Now don't lash at me for being honest, because if you think of it, its ALL true.

CtrlAltDefeat · 09-23-2009, 01:26 AM

Quote:

Originally Posted by Lafiro

It really is around 20hp. OBDII reports just that on a live graph, tested it myself on the Yaris, and other cars, and the average was around 20hp for about any car I tested so far.

20hp is resonable, I mean its not like we are pressing down the gas pedal 100% to try and get up to 106crank horse power now are we?
no.

We probably use half the gas pedal, so the remaining power just goes to the a/c compressor. So the light foots don't feel it much, and the heavy feet people, will ALWAYS feel the difference in power. Plain and simple.

Edit:
No one take this the wrong way, I spoke to a few good friends of mine, and they told me whoever says the a/c compressor doesn't slow down the car, and that whoever says, the a/c compressor doesn't change numbers when running a dyno is a retard.
I happen to believe them, and Im sick of people trying to disagree with the TRUTH as if its something that makes them happy.

Now don't lash at me for being honest, because if you think of it, its ALL true.

ok well if you say you saw 20hp, I believe it... I am a heavy foot and I do notice the difference. It just seemed to me like 20hp is too much. Almost 1/5th of the total hp just seems like it would more noticeable at WOT then it is (to me any ways). I guess I should do some closer studies of it. I wish I could do a dyno run,this kind of thing is really interesting to me. If I could I'd dyno it before and after every performance mod (and once with the ac and without)

ddongbap · 09-23-2009, 03:02 AM

Quote:

Originally Posted by Lafiro

It really is around 20hp. OBDII reports just that on a live graph, tested it myself on the Yaris, and other cars, and the average was around 20hp for about any car I tested so far.

20hp is resonable, I mean its not like we are pressing down the gas pedal 100% to try and get up to 106crank horse power now are we?
no.

We probably use half the gas pedal, so the remaining power just goes to the a/c compressor. So the light foots don't feel it much, and the heavy feet people, will ALWAYS feel the difference in power. Plain and simple.

Edit:
No one take this the wrong way, I spoke to a few good friends of mine, and they told me whoever says the a/c compressor doesn't slow down the car, and that whoever says, the a/c compressor doesn't change numbers when running a dyno is a retard.
I happen to believe them, and Im sick of people trying to disagree with the TRUTH as if its something that makes them happy.

Now don't lash at me for being honest, because if you think of it, its ALL true.

So this is where you went.

Going to say this once more. Dyno said 3 hp change.

I never said there wasn't a change.

We dynoed my friend's S2K on Monday. There was only a 5 hp difference at the top of the RPM range, which is probably just regular fluctuation. The car automatically turned off the AC after 7500 RPM. But everything below that 7500 RPM point took a hit. Nothing near 20%. I never disagreed with you that the AC robs power. I'm just disagreeing that it takes 20% away.

I said I didn't feel a difference. That doesn't mean there isn't one. The Yaris is so slow, it doesn't really matter to me.

If you're going to have a debate, please don't be lame and bring personal hits.

darthbauer · 09-23-2009, 02:50 PM

Slow days are the normal days.

I just notice the fast/good days that my car has.

frownonfun · 09-22-2009, 11:22 PM

ok i know these fuel debates can get messy so just let me first say the following statements are just my opinion so please no one get angry if they disagree...

every company is required to add detergent additives to their gasoline so i really doubt the brand of gasoline is making a difference personally. true some companies add a little more and give them cool sounding names (V-Power, Techron) but like most things it comes down to more of a marketing gimmick than anything else.

if your car seems like it performs better some days than others it's more than likely just your imagination.

YarisSedan · 09-22-2009, 11:58 PM

Quote:

Originally Posted by frownonfun

ok i know these fuel debates can get messy so just let me first say the following statements are just my opinion so please no one get angry if they disagree...

every company is required to add detergent additives to their gasoline so i really doubt the brand of gasoline is making a difference personally. true some companies add a little more and give them cool sounding names (V-Power, Techron) but like most things it comes down to more of a marketing gimmick than anything else.

if your car seems like it performs better some days than others it's more than likely just your imagination.

"Over the past several years, the minimum level of detergent additive required by the EPA has declined by an estimated 50%."

http://www.toptiergas.com/

frownonfun · 09-23-2009, 12:17 AM

Quote:

Originally Posted by YarisSedan

"Over the past several years, the minimum level of detergent additive required by the EPA has declined by an estimated 50%."

http://www.toptiergas.com/

i gotcha. i read that article also. and everyone has a right to believe what they want. besides what would i know about petroleum?

Kaotic Lazagna · 09-23-2009, 12:25 AM

Quote:

Originally Posted by frownonfun

i gotcha. i read that article also. and everyone has a right to believe what they want. besides what would i know about petroleum?

Everyone is entitled to their opinions. If the cheaper gas hasn't given you problems, then keep at it.

Kaotic Lazagna · 09-22-2009, 11:34 PM

I was going from experience. I've never had any problems with my cars since I've always used Chevron. My friends use any cheap gas, and all of their cars have had problems already. One car needed its fuel filter replaced, one had bad injectors, and one is misfiring (spark plug may be?). I'd rather play it safe and cough up an extra 10 cents a gallon.

YarisSedan · 09-22-2009, 11:57 PM

Maybe colder days the air is denser giving you slightly more power as opposed to a hot day when air is less dense as well as you may be running the a/c so its compounded.

yaris-me · 09-23-2009, 02:49 AM

Quote:

Originally Posted by detroiter

Maybe it's my "butt dyno" or something but I swear some days it feels
like my Yaris drives nice and normal, then other days it feels like a dog
like it's dragging along, with a lack in performance like accelerating and such. Not sure if it's just me or something is going on :(

You have a sensitive dyno.

It is the adaptive ECU. If you drive slow for a while there will be a delay or a slower opening of the throttle. If you stomp on the gas for a while, there will be no delay. The ECU will adjust to your driving style. You can verify this with a Scangauge or a PLX Kiwi and watching the throttle opening when you press on the gas.

Lewis · 09-23-2009, 07:23 AM

My Yaris is slow EVERY day- just like it's 62 year old owner- a perfect match!

*tk-421* · 09-23-2009, 07:32 AM

I have noticed that my Yaris feels a bit sluggish after someone used it before me (I usually drive it pretty fast while the other driver doesn't at all). I think it has to do with the ECU's re-learning algorithm.

gokartride · 09-23-2009, 08:42 AM

Haven't had any issues of this nature.

Bob Dog · 09-23-2009, 10:31 AM

Thought: A rainy day would tend to make one drive slower, and the ECU would adjust. The next time you got in the car you would hve a slow day.

Lafiro · 09-23-2009, 11:21 AM

That could also be true.

I noticed one thing too, I disconnected the battery for a short while, and after plugging it back in, the car would idle much lower.

If I was driving and came to a stop, it would shake and stay around 400rpm. I would also notice that as long as I did not give it too much gas during the trip, each time I would change gears, or let go of the gas, it would drop to as low of an rpm as possible, never seen this before.

After about 1 other trip of normal driving, and turning the car on and off maybe two times during that trip, things went back to normal. Meaning the RPM's.

So yes the ECU does learn things, and pretty quickly. And they do affect your next trip, I give you that!

09-22-2009, 10:01 PM	#2
CtrlAltDefeat I ♥ Yaris View User's Garage Drives: Black 08 LB MT & red 97 Miata Join Date: Oct 2008 Location: Indianapolis IN Posts: 1,313	Well I've noticed that my car reacts a lot to the air. On cool dry days (when the air is dense and has low humidity) it always seems to have a bit more pep, whereas hot humid days, it's a little slower... __________________ The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell

09-23-2009, 02:50 PM	#6
darthbauer Not really here... Drives: 2008 Blazing Blue S hatchback Join Date: Oct 2008 Location: USA Posts: 1,062	Slow days are the normal days. I just notice the fast/good days that my car has. __________________ Liberate Tutemet Ex Infernis.

09-23-2009, 07:32 AM	#15
tk-421 Super Moderator View User's Garage Drives: 5D-07-LB Join Date: Jan 2007 Location: Dagobah Posts: 4,263	I have noticed that my Yaris feels a bit sluggish after someone used it before me (I usually drive it pretty fast while the other driver doesn't at all). I think it has to do with the ECU's re-learning algorithm. __________________ --[ FORUM RULES ]--[ SEARCHING TIPS ]--[ EYELIDS PICS ]--[ RBK SPOILER ]--[ BEST/WORST INVESTMENTS ]--

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Jerkratt - Photo Scavenger Hunt	Jerkratt	Photo-Video-Media Gallery	3	03-04-2009 09:03 AM
Photo Scavenger Hunt Ideas Thread	Black Yaris	Photo-Video-Media Gallery	41	02-28-2009 08:54 PM

09-22-2009, 10:14 PM	#3
Lafiro Drives: 06 Yaris Sedan Join Date: Jun 2006 Location: NYC Posts: 694	It really is around 20hp. OBDII reports just that on a live graph, tested it myself on the Yaris, and other cars, and the average was around 20hp for about any car I tested so far. 20hp is resonable, I mean its not like we are pressing down the gas pedal 100% to try and get up to 106crank horse power now are we? no. We probably use half the gas pedal, so the remaining power just goes to the a/c compressor. So the light foots don't feel it much, and the heavy feet people, will ALWAYS feel the difference in power. Plain and simple. Edit: No one take this the wrong way, I spoke to a few good friends of mine, and they told me whoever says the a/c compressor doesn't slow down the car, and that whoever says, the a/c compressor doesn't change numbers when running a dyno is a retard. I happen to believe them, and Im sick of people trying to disagree with the TRUTH as if its something that makes them happy. Now don't lash at me for being honest, because if you think of it, its ALL true.

09-22-2009, 11:22 PM	#7
frownonfun View User's Garage Drives: 09 Yaris HB, 08 SR5 Tundra Join Date: Jan 2009 Location: RGV, Texas Posts: 1,086	ok i know these fuel debates can get messy so just let me first say the following statements are just my opinion so please no one get angry if they disagree... every company is required to add detergent additives to their gasoline so i really doubt the brand of gasoline is making a difference personally. true some companies add a little more and give them cool sounding names (V-Power, Techron) but like most things it comes down to more of a marketing gimmick than anything else. if your car seems like it performs better some days than others it's more than likely just your imagination.

09-22-2009, 11:34 PM	#11
Kaotic Lazagna View User's Garage Drives: '14 GT86, '08 Vitz Join Date: Dec 2006 Location: Central Valley, CA Posts: 9,873	I was going from experience. I've never had any problems with my cars since I've always used Chevron. My friends use any cheap gas, and all of their cars have had problems already. One car needed its fuel filter replaced, one had bad injectors, and one is misfiring (spark plug may be?). I'd rather play it safe and cough up an extra 10 cents a gallon.

09-22-2009, 11:57 PM	#12
YarisSedan Drives: 08 Yaris Sedan Join Date: Oct 2008 Location: California - Bay Area Posts: 2,773	Maybe colder days the air is denser giving you slightly more power as opposed to a hot day when air is less dense as well as you may be running the a/c so its compounded.

09-23-2009, 07:23 AM	#14
Lewis Our off road vehicle Drives: 2009 Yaris 3dr Join Date: Apr 2009 Location: NJ Posts: 198	My Yaris is slow EVERY day- just like it's 62 year old owner- a perfect match!

09-23-2009, 08:42 AM	#16
gokartride Drives: 2009 Yaris 3-Door Liftback Join Date: Jun 2009 Location: Texas Posts: 213	Haven't had any issues of this nature.

09-23-2009, 10:31 AM	#17
Bob Dog DARK PHASE OF THE MOON Drives: 07 liftback Join Date: Apr 2009 Location: the Boondocks, NC Posts: 993	Thought: A rainy day would tend to make one drive slower, and the ECU would adjust. The next time you got in the car you would hve a slow day.

09-23-2009, 11:21 AM	#18
Lafiro Drives: 06 Yaris Sedan Join Date: Jun 2006 Location: NYC Posts: 694	That could also be true. I noticed one thing too, I disconnected the battery for a short while, and after plugging it back in, the car would idle much lower. If I was driving and came to a stop, it would shake and stay around 400rpm. I would also notice that as long as I did not give it too much gas during the trip, each time I would change gears, or let go of the gas, it would drop to as low of an rpm as possible, never seen this before. After about 1 other trip of normal driving, and turning the car on and off maybe two times during that trip, things went back to normal. Meaning the RPM's. So yes the ECU does learn things, and pretty quickly. And they do affect your next trip, I give you that!