Does your car ever have "slow" days?

[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 :(

[Kaotic Lazagna]

Just the days I have to use my A/C. hehehe. I actually have days that are the opposite, when it feels like it has more power.

What kind of gas do you use (talking about brands)?

[YAR1S]

Sometimes I feel that way in my yaris aswell ....
weird.... maybe its gas like kaotic said.

[advocate]

Just the days I have to use my A/C. hehehe. I actually have days that are the opposite, when it feels like it has more power.

What kind of gas do you use (talking about brands)?

Whichever one is the cheapest :frown:

[detroiter]

I usually use Shell and sometimes use BP, very rarely I'll use Mobil.

[tomato]

hmm, that's odd, I use the same gasoline (from Costco) and I feel like some days the Yaris has more pep.

no, it isn't...


it can't be ...


Are they ......


.... :eyebulge: ALIVE? :eyebulge:



:evil::burnrubber::evil:

[detroiter]

I'd say on it's "slow" days that it feels almost like it's being held back or restricted. Almost like if your driving a car and the cars exhaust is clogged up, feeling slow and sluggish as hell.

[Bob Dog]

Mine seems that way too. I'm just guessing but I suspect barometric pressure and, humidity and temperature affect sensor readings.

[TheRealEnth]

Well if you take it SUPER GRANNIE SLOW, in the warmup period, then it will act sluggish for a while, if u take it normal in the warmup period, it acts normal, if u take it hard in the warmupperiod... its bad for ur car but itll run hard..... thats the truth

[Bob Dog]

I noticed the same thing with moms X/a the cars seems to respond differently depending on the weather,I believe it may affect the sensor reading, and the ECU my respond slightly differently . I 'd put small money on it

[Kaotic Lazagna]

How is your driving style? If you hypermile like I do, try flooring it to near readline on the freeway on an onramp to flow of traffic.

[Kaotic Lazagna]

Whichever one is the cheapest :frown:

Ouch, not good. You could possibly foul up the injectors or spark plugs.

[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.

[CtrlAltDefeat]

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...

[CtrlAltDefeat]

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.

20hp? really? That seems like an awfully lot from our 106hp engines... I would think it'd be a little more noticeable then it is, if it's that much...

[2009BBPliftback]

I don't know about my car having slow days but I have those on occasion.

[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.

[YAR1S]

I don't know about my car having slow days but I have those on occasion.

:laugh:

[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.

[Kaotic Lazagna]

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]

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.

[YarisSedan]

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]

"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]

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. :wink:

[CtrlAltDefeat]

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)

[yaris-me]

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.:wink: 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. :smile:

[ddongbap]

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.

[Lewis]

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

[tk-421]

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]

Haven't had any issues of this nature. :smile:

[Bob Dog]

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]

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!

[YarisPR]

Glad to know me and my Friends (Yaris owners) ain't the only ones who noticed this. Since I don't know why it does it I like to think my Yaris is a real Biatch!!! :biggrin:

[ddongbap]

Now, when you hit the gas, no matter how much you stomp on it, the A/C being ACTIVE will reduce 20-22% of the engine. Which to our 106hp engine means roughly 20-22housepower is gone because of it.

http://www.yarisworld.com/forums/showpost.php?p=380993&postcount=16

[Liltoaster]

When the A/C is one mine is a slug!!!! With it off its pretty peppy once its warmed up.

I use Chevron Premium religiouly.

[TheRealEnth]

So Case Closed, ECU adapts to our driving styles.

[PETERPOOP]

has to be the a/c

[darthbauer]

Slow days are the normal days.

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

[mata5346]

everyday driving from santa monica to the san fernando valley...

[Twistoffate0817]

I 100% understand about what everyone is talking about. Some days my car just is horrible. Then other days its the best thing ever. Its weird, and i only use Shell gas. I have never put any other gas in there. And usually the car acts bad on colder days.

[PETERPOOP]

My car drives best at 4:45 am on my way to work. Perfect temp for the engine!

[YAR1S]

Could it be that on the so called "sluggish" days.... your gas tank is full or somewhat full... and on the "quicker" days your gas tank is closer to a quater of a tank or even near empty??? This crossed my mind today mostly cause my yaris seemed to be a lot more zippy-er and it was below 1/4 tank.

[Bob Dog]

what does gas weigh a gallon?

[auxmike]

what does gas weigh a gallon?

5.93 to 6.42 lbs, depending on temperature, type and blend (e.g. with methanol, water, benzene etc).

[YAR1S]

5.93 to 6.42 lbs, depending on temperature, type and blend (e.g. with methanol, water, benzene etc).

per gallon or tank?.. I may regret this later, it sounds stupid even as I ask, LOL

[Bob Dog]

not but 50 or 60 lbs diff....m but I have noticed it seems that way to me sometimes

[auxmike]

per gallon or tank?.. I may regret this later, it sounds stupid even as I ask, LOL

The question was "what does gas weigh a gallon?":laugh:

[YAR1S]

ah, 60 ponds lighter could make the yaris seem quicker, IMO.

[ozmdd]

I suspect that the weight of gas and A/C use are definite factors here. Also, the Yaris seems fairly sensitive to humidity and air temp. Since I've installed the CAI, I notice significantly more pep, even when the air is hot. When its really humid, nothign really helps with the loss of "oomph."
I've been tracking my intake air temp with the Scangauge for a while, both before and after the CAI, and the correlation between the change in air temp is pretty apparent to me.

[scape]

i'd say my yaris is groggy in the morning, or late dewy nights; including the clutch...but then again I have a feeling that it might just be me, haha

[scape]

found this, but don't quote me on it!

Water: 998 kg/m3

Gasoline: 720 kg/m3

Diesel: 830 kg/m3


i wonder if lower octane fuel weighs less, haha

[auxmike]

found this, but don't quote me on it!

Water: 998 kg/m3

Gasoline: 720 kg/m3

Diesel: 830 kg/m3


i wonder if lower octane fuel weighs less, haha

Can you explain this, I'm lost!:confused:

[shaneeezy]

LOL! I thought I was the only one that thought that. Mine takes FOR-EV-ER to accelerate!

[CtrlAltDefeat]

Can you explain this, I'm lost!:confused:

thats weight per... volume i assume... m3 is... cubic meter? its weight per gallon with the metric system lol

[SilverBack]

Mine acts up only when there's moisture in the air. On rainy days it's like a mule

[scape]

Can you explain this, I'm lost!:confused:

well, to make things short: gasoline should weigh less than water, so measure a gallon of water and you know it will be less than that.
some numbers I found while browsing are .74 times the weight of water, as well as a final number close to 6.3 lbs per gallon..it also depends on ethanol treatment and other additives as well...
again, don't quote me on this as I have not done the measurement my self :D
if you have a lawn mower, you probably have a gas can of 1 gallon...

[1stToyota]

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?

[LittleRed]

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 :(

Have u tried putting in fuel system cleaners in it..they make a tremendous difference as well as using 91 octane gas...mine is fast now...put in an AFE cold-air intake as well...apparently the engine is starved of air under greater loads

[JumpmanYaris]

Mine is FAST like a Bugatti lol

[frownonfun]

actually mine's fast everyday now. hehe.

[tk-421]

I want my car to be fast every day. :cry:

[YAR1S]

these cooler days are making my car peppy-er..... or maybe its cause my AC has been turned off :tongue:

[JumpmanYaris]

these cooler days are making my car peppy-er..... or maybe its cause my AC has been turned off :tongue:

U roll wit ur windows up and ac on in the summer? naa u got to roll wit them down thats gangsta right there son take the heat lol

but yeah the A/C makes a huge diff. on how ur car respond

i hate when ppl r going up a good hill with ac on then u see em going like 40 mph on a 60 zome well in puerto rico that is

[xtremesniper]

The cold weather makes my car make more noises than I'm used to hearing. The engine is pretty loud and while the car is warming up random parts seem to rattle and vibrate more than they did in the summer.

Normal? I'm not too concerned... just wondering.

[Bob Dog]

I had a Metro and you pretty much had to totally turn off the air conditioning if you hit a steep incline.

[Twistoffate0817]

Lately my Yaris seems to be slow all the time. I can easily go from 0-25 mph fine, then once i get from 30-40 its just no power. The performance is better when ive been using the car for awhile, but it is horrible when i have not been using it for a while. And Yes, i do let the cool light go out before going over 40 mph.

[Altitude]

The cold weather makes my car make more noises than I'm used to hearing. The engine is pretty loud and while the car is warming up random parts seem to rattle and vibrate more than they did in the summer.

Normal? I'm not too concerned... just wondering.

Shrinkage.

[Red Horse]

The problem could be the person. If they just got out from the buffet, the car will be slower or if they just got out from the bathroom, the car is faster.

[Thai_Dang]

I feel like mines is slow on the freeway, like when i put light pressure on the pedal, over time the speed would slowly creep downwards. Never felt that way in any of my family's camrys. Its like a different baseline of power to what I'm used to in terms of pedal travel. Of course, when I stomp on the pedal it gives me all the acceleration i need.