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05-08-2010, 07:34 PM | #1 |
Learning & Upgrading
Drives: 2006 Yaris 5 Dr HB Black Join Date: Apr 2010
Location: Unionville/Markham, ON
Posts: 197
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Noob need help !
Just have a question for every expert here, I realised that whenever I filled up the tank, right afterward my car seems more smooth and powerful in cruising.
Also, I fill my tank with 91 premium gas. Just wondering how come there is a difference, does it mean I need to take it for a tune up or spark plug change? Just recently done oil change and filter change. Everyone's information are very much appreciated. |
05-09-2010, 09:23 AM | #2 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Well for starters, you're throwing your money away with the premium gas. The car's designed to run on reg.
And I'm pretty sure it's just a placebo effect, because your adding about 100lbs to the car when you fill it from empty. So the car should actually be slower. |
05-09-2010, 11:05 AM | #3 |
Reluctantly Crouched...
Drives: 2008 Yaris HB M/T Join Date: Oct 2008
Location: DFW, TX
Posts: 867
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Well, you might have some kind of contamination (water?) in your tank if you have a performance change with a full tank. As for the octane, bluevitz is correct: your engine compression is engineered for regular unleaded, and will see no advantage from premium gasoline. Also, most brands of gasoline actually have the same additives (techron, etc) in all grades of their gas, despite what the advertising leads you to believe.
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05-09-2010, 11:18 AM | #4 |
Yeah...the guys are right. The 1NZ just doesn't have the compression to benefit from premium fuel. You're probably just experiencing the above mentioned "placebo" effect. The only plus at all from using it may be the fact that some brands add additional cleaners and additives to their premium grades. That shouldn't make any difference in a tank or 2 though.
Last edited by Billiam; 05-09-2010 at 04:20 PM. |
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05-09-2010, 01:31 PM | #5 |
Learning & Upgrading
Drives: 2006 Yaris 5 Dr HB Black Join Date: Apr 2010
Location: Unionville/Markham, ON
Posts: 197
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Thanks every one, because I heard from a friend saying that 91 is better and cleaner than the 87, and when I use the 91 instead of the 87, I can actually save more fuel.
Will switch it back then. Thanks thanks. |
05-09-2010, 01:48 PM | #6 | |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Quote:
Also, the 1NZ-FE with a 10.5:1 C/R does have a high enough compression to use 91 or higher octane fuel, but the computer's program limits timing so that is runs on regular 87. I know a guy running a Stand Alone ECU on his N/A Echo and has increased his timing by 10° up to around 42° at the upper end of the RPMs and has gained roughly 7-8hp alone from that and premium gas. You have to remember that this engine was designed with one thought. Fuel efficiency. |
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05-09-2010, 02:48 PM | #7 | |
Banned
Drives: Bayou Blue Yaris Hatchback Join Date: May 2010
Location: Dreamland
Posts: 5
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Quote:
Can you get a stand alone ecu for the yaris? should be similar right? |
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05-09-2010, 02:51 PM | #8 |
Banned
Drives: 07 sedan Join Date: Mar 2010
Location: new mexico
Posts: 292
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05-09-2010, 06:34 PM | #9 | |
Learning & Upgrading
Drives: 2006 Yaris 5 Dr HB Black Join Date: Apr 2010
Location: Unionville/Markham, ON
Posts: 197
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Quote:
Anyway, just wondering waht does ECU mean? |
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05-09-2010, 07:11 PM | #10 |
Banned
Drives: 07 sedan Join Date: Mar 2010
Location: new mexico
Posts: 292
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Engine control unit - http://en.wikipedia.org/wiki/Engine_control_unit
It basically controls everything about how the engine runs, timing, air, fuel, etc. The US yaris ECU thus far is unbreakable/unflashable. |
05-10-2010, 01:27 AM | #11 | |
Learning & Upgrading
Drives: 2006 Yaris 5 Dr HB Black Join Date: Apr 2010
Location: Unionville/Markham, ON
Posts: 197
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Quote:
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05-10-2010, 05:57 AM | #12 |
black shark
Drives: black toyota yaris t3 sprit Join Date: May 2010
Location: Pretoria, south africa
Posts: 122
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i get more miles on the prem, i also find when ever i get a chance i will clean the air filter that also helps the miles add up to the tank, changing spark plugs at every service helps also,
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05-10-2010, 05:12 PM | #13 |
Banned
Drives: 07 sedan Join Date: Mar 2010
Location: new mexico
Posts: 292
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05-10-2010, 05:57 PM | #14 |
Learning & Upgrading
Drives: 2006 Yaris 5 Dr HB Black Join Date: Apr 2010
Location: Unionville/Markham, ON
Posts: 197
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I guess every service is a bit too frequent though, even though it will do no harm. I am not sure.
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05-10-2010, 06:07 PM | #15 |
I just changed my spark plugs at about 87k miles, and there was still a little life left in the old ones if I wanted to continue to use them
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05-10-2010, 06:35 PM | #16 | |
ULTIMATE
Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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Quote:
__________________
Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
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05-10-2010, 07:48 PM | #17 |
Learning & Upgrading
Drives: 2006 Yaris 5 Dr HB Black Join Date: Apr 2010
Location: Unionville/Markham, ON
Posts: 197
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Yeah, it doesn't make sense too. Whenever I fill up the tank, the car suppose to be heavier, the acceleration should be sloppy. But to me, the acceleration of mine after the refill get sharper, weird.
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05-10-2010, 08:17 PM | #18 |
Drives: '08 3-Door Join Date: Apr 2010
Location: Oregon
Posts: 35
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There is another thing to consider... on a full tank of fuel, you will have "colder" fuel and it will take longer for it to warm up through recirculation and heating in the fuel lines above the engine. So, it is possible to have a slight difference, but generally it shouldn't be noticeable.
As for the higher octane, I have done some extensive studies on my car with both 87 and 92 octane. I get more mpg's with 92, average goes up about 1.0 mpg, but with the cost of the fuel being 20 cents higher, doesn't warrant the extra cost. I still run it though, because I notice that my off-idle throttle response is a touch better and it makes it easier to get the clutch out without chatter on the 92 octane. My 2 cents. |
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