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08-17-2009, 02:39 PM | #73 |
LOL. Is the underdrive really going to help that much? I already have your lightened crank pulley. Plus, I'm saving for a rainy custom intake day.
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08-17-2009, 02:40 PM | #74 |
Anyone have any comments on the ECU question?
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08-17-2009, 02:58 PM | #75 |
ULTIMATE
Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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Well, you have changed the amount of air (and fuel) passing through the motor. So your ECU will definitely "notice" that and be making some adjustments (= "relearn"). I'm not sure you have to reset it for it to do that, but it's not a bad idea.
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08-17-2009, 03:11 PM | #76 |
Rides canyon walls
Drives: 1988 RX7 FC 10th AE Join Date: Jun 2007
Location: Long Beach, CA
Posts: 503
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You should. When I installed the headers for the first time I didnt d/c the battery and I got CEL after a few minutes driving. Reset the battery and you shouldn't get a CEL ever assuming installation was done correctly. Running some crap ebay headers with no problems for a month now. :)
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08-17-2009, 03:27 PM | #77 |
I didn't throw a CEL but I'll disconnect overnight and see how it feels afterward.
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08-17-2009, 07:52 PM | #78 |
Slowy getting there
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You may want to rev it up acouple time after you start it back up to help the ECU out a little.
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08-17-2009, 08:05 PM | #79 |
Drives: Yaris Join Date: Apr 2009
Location: USA
Posts: 355
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Fantastic write-up! I will definitely hold off on this mod. Thanks again for the great post.
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08-17-2009, 08:06 PM | #80 |
Hmmm... I read about that trick. I'm a little skeptical but I'll definitely go on a drive afterward, give it some juice.
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08-18-2009, 12:38 PM | #81 |
Drives: 2007 Yaris LB Join Date: Mar 2007
Location: San Jose, CA, USA
Posts: 685
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Can someone please explain the physics of why would you lose some low-end torque with a less restrictive header? It's not quite intuitive to me, as to why that would happen, but I admit I'm not a mechanic
It's too late for me anyway, as I ordered mine last week but I'd still like to understand what happens there. |
08-18-2009, 04:15 PM | #82 |
I don't know the physics behind it but I'm assuming it has to do the scavenging properties of the new header. The header doesn't take the exhaust gasses away fast enough at low RPMS due to an increased volume in tubing. The pressure in the manifold is probably too low. Once the engine begins to rev higher and the exhaust pressure begins to rise, that additional volume gets put to use and allows for the exhaust gasses to be expelled more quickly and freely than that stock header that was on there. I could be completely wrong but that's my experience with two-stroke motorcycle stuff talking. I imagine the principles are the same.
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08-18-2009, 08:09 PM | #83 |
Drives: Yaris Join Date: Apr 2009
Location: USA
Posts: 355
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slimmer tube....faster flow and the interior geometry and surface finish also matters. A fatter tube with such a weak motor and you will feel the loss in torque due to less velocity. Don't forget, the car was designed/engineered as a whole unit which means that the overall efficiency is probably maximized with the stock exhaust header. Add some other modifications and well....that story might not hold truth any longer.
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08-20-2009, 09:41 PM | #84 | |
Just a Herbicidal maniac.
Drives: 2008 Yaris S Sedan Flint Mica Join Date: Oct 2008
Location: Roseville, CA - USA.
Posts: 450
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Quote:
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08-21-2009, 11:01 PM | #85 |
I disconnected the battery for a couple of hours today and went for a heavy footed drive up and down highway 280 and then up and down some hills.
At first it seemed like nothing was different. This is probably because I was skeptical the ECU would change anything given I had already driven the car for 100 miles or so. Well, I was totally wrong. The low end torque feels like it's back! I did some "tests" up some of the steeper hills in my neighborhood and I can definitely feel more power down low. I don't know the exact extent of the change when compared to the stock header but the throttle response really is better and the engine just feels like it has better pull than before the ECU reset. I can say that disconnecting the ECU definitely helped things and anyone adding a header should probably perform the reset. I'm going to go on an early drive up highway 1 to Tamales Bay tomorrow morning, grab some breakfast and see if it gets even better!! Thank you all for the suggestion. |
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08-21-2009, 11:03 PM | #86 | |
Quote:
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08-21-2009, 11:36 PM | #87 |
Just a Herbicidal maniac.
Drives: 2008 Yaris S Sedan Flint Mica Join Date: Oct 2008
Location: Roseville, CA - USA.
Posts: 450
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Will do! Enjoy your drive up hwy 1!
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2008 Toyota Yaris (Vios) 'S' sedan, Flint Mica, dropped on TRD springs, TRD anti-sway bar. Tinted rear windows. Lenso Samurai SC02 hyper black 17" x 7" rims, wrapped in 205x40x17 Federal ss595's. Color matched eyelids. Vios badge. Body color trunk trim (was chrome). Lamin-X tint on rear tails. Custom center exit exhaust. Tanabe front strut tower brace. |
08-21-2009, 11:56 PM | #88 |
Slowy getting there
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Glad to hear that helped
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08-22-2009, 06:08 PM | #89 |
Drives: 2007 Yaris Hatchback Join Date: Aug 2009
Location: Long Island New York
Posts: 4
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Galavoxx
Great to hear. I hope it gets even better for you tomorrow. |
08-22-2009, 09:22 PM | #90 |
Drives: 2007 Yaris LB Join Date: Mar 2007
Location: San Jose, CA, USA
Posts: 685
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