DIY - 1.8L 1ZZ-FE TB Connector Chip Swap - Page 6 - Toyota Yaris Forums

jkuchta · 03-27-2009, 11:06 PM

The only experiance I have is with the Corolla TB, so that's the only one that I can say for sure fits.

Dallas,

The TB can't ice up, as there is no fuel passing through the TB. To get normal intake air to ice up you'd need to run it through a really small venturi to get the pressure low enough.

Hatchbackkid, do you know what the DTC associated with the CEL is? Sounds like you have an air leak. Don't forget that the silicone sealent has to sit for a few hours to harden enough to resist the vacuum at idle.

dallas · 03-28-2009, 03:00 AM

I thought that is the only reason why they run hot coolant lines into the TB, in our cold climate if you bypass it you will have issues around zero, with rought running etc everyone around here calls it icing, do you know whats actually happening! I agree for ulimate performance you don't want it hot as a cooler air is more dense,

Quote:

Originally Posted by jkuchta

The only experiance I have is with the Corolla TB, so that's the only one that I can say for sure fits.

Dallas,

The TB can't ice up, as there is no fuel passing through the TB. To get normal intake air to ice up you'd need to run it through a really small venturi to get the pressure low enough.

Hatchbackkid, do you know what the DTC associated with the CEL is? Sounds like you have an air leak. Don't forget that the silicone sealent has to sit for a few hours to harden enough to resist the vacuum at idle.

jkuchta · 03-28-2009, 03:21 AM

As far as I can tell, the TB is heated to give better fuel economy. Why a cold charge would cause those problems is beyond me.

I've flown injected piston aircraft is sub-zero conditions and they just seem to run stronger!

marcus · 04-22-2009, 03:17 PM

[QUOTE=jkuchta;275971]As far as I can tell, the TB is heated to give better fuel economy. Why a cold charge would cause those problems is beyond me.

im assuming the high rev on cold start is due to oil being cool has to warm up ..

AlexNet0 · 04-22-2009, 06:50 PM

Quote:

im assuming the high rev on cold start is due to oil being cool has to warm up ..

its due to the open loop during warm up, a preset throttle position untill its warm and then it uses the sensors and activly adjusts it. the opening is 30 percent larger so the preset is automatically that much higher

*tk-421* · 04-22-2009, 07:02 PM

Quote:

Originally Posted by AlexNet0

its due to the closed loop during warm up, a preset throttle position untill its warm and then it uses the sensors and activly adjusts it. the opening is 30 percent larger so the preset is automatically that much higher

Do you think that will have an impact on engine life and/or MPG in the end? I really like this mod, but I may not keep it if it's doing any damage...

AlexNet0 · 04-22-2009, 07:40 PM

Quote:

Originally Posted by camelll

I think you meant open loop during warm up.

lol yup *duh*

jkuchta · 03-28-2009, 03:24 AM

Hey Nexus the TB has been on for 260 miles, and no problems, and the improvement is still there!

Saggio · 03-28-2009, 05:21 PM

Quote:

Originally Posted by jkuchta

Hey Nexus the TB has been on for 260 miles, and no problems, and the improvement is still there!

Is your TB still heated?

AlexNet0 · 03-28-2009, 05:40 PM

it would make sense around here because it gets very cold (0 or lower) consistantly in the winter, and on the off day it will be cool and very damp. so cool and damp, temp drops, condenses on butterfly flange, engine cools down, butterfly freezes. makes sense to me for this area at least

jkuchta · 03-28-2009, 10:59 PM

Saggio, my TB is not heated.

Alex, it would have to be REALLY cold and VERY humid for ice to form in the TB. When a carb freezes up it is caused by the fact that fuel requires energy to vaporize...thus when fuel vaporizes it super cools the air it's in, thus causing the water vapor in the air to turn to ice. Because there is no fuel passing through the TB on our cars, there is no way the air can become supercooled enough to form ice.

The cold weather problems people are running into with unheated TB's may be caused by there being too little heat in a less-than-fully-warmed-up engine to fully vaporize the fuel in the intake port of the cylinder head, causing rough running (caused maybe by the resultant lean condition, or an over-rich ECU compensation).

This is just a theory of mine, and may not be totally correct, but I think its at least a pretty good guess

AlexNet0 · 03-29-2009, 12:43 AM

yours makes sense, it was just what seemed logical to me

Quote:

..Because there is no fuel passing through the TB on our cars, there is no way the air can become supercooled enough to form ice.

welllll, maybe I should not bypass anyway, lol, because a future mod planned WILL supercool the intake air

MGargano · 04-09-2009, 02:43 AM

Will this: http://cgi.ebay.com/ebaymotors/TOYOT...Q5fAccessories work with the '09 3-door HB? I'm planning to do the DIY listed in this thread, but I want to make sure this is the correct TB first.

Gideon · 04-09-2009, 02:55 AM

Yup, that's the one. Great seller too, bought mine from them.

MGargano · 04-09-2009, 11:42 AM

Quote:

Originally Posted by Gideon

Yup, that's the one. Great seller too, bought mine from them.

Thanks, Gideon. So, if I'm reading this thread correctly, all I need is the 1ZZ-FE TB and the chip from my stock TB? Anything else needed to get everything working? I'm not looking to do the coolant bypass or anything.

MGargano · 04-21-2009, 06:22 PM

For those of you who did the coolant bypass, did you plug the tubes on the TB or just leave them open?

mikenacarato · 04-21-2009, 06:28 PM

i actually pulled the tubes out with some pliers for a cleaner look and polished it up. so yes they are open.

MGargano · 04-21-2009, 09:14 PM

Quote:

Originally Posted by mikenacarato

i actually pulled the tubes out with some pliers for a cleaner look and polished it up. so yes they are open.

I capped mine. Think that's gonna make any difference?

03-28-2009, 05:40 PM	#10
AlexNet0 View User's Garage Drives: '07 Yaris 3dr Join Date: Nov 2008 Location: Rockland, ME Posts: 1,638	it would make sense around here because it gets very cold (0 or lower) consistantly in the winter, and on the off day it will be cool and very damp. so cool and damp, temp drops, condenses on butterfly flange, engine cools down, butterfly freezes. makes sense to me for this area at least __________________ ---------- MI-YW ----------

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03-27-2009, 11:06 PM	#1
jkuchta View User's Garage Drives: 2007 Yaris hatch (red) Join Date: Sep 2007 Location: L.A. Posts: 557	The only experiance I have is with the Corolla TB, so that's the only one that I can say for sure fits. Dallas, The TB can't ice up, as there is no fuel passing through the TB. To get normal intake air to ice up you'd need to run it through a really small venturi to get the pressure low enough. Hatchbackkid, do you know what the DTC associated with the CEL is? Sounds like you have an air leak. Don't forget that the silicone sealent has to sit for a few hours to harden enough to resist the vacuum at idle.

03-28-2009, 03:21 AM	#3
jkuchta View User's Garage Drives: 2007 Yaris hatch (red) Join Date: Sep 2007 Location: L.A. Posts: 557	As far as I can tell, the TB is heated to give better fuel economy. Why a cold charge would cause those problems is beyond me. I've flown injected piston aircraft is sub-zero conditions and they just seem to run stronger!

04-22-2009, 03:17 PM	#4
marcus toyota View User's Garage Drives: 2007 Yaris RS Blazed Join Date: Oct 2006 Location: toronto, canada Posts: 3,637	[QUOTE=jkuchta;275971]As far as I can tell, the TB is heated to give better fuel economy. Why a cold charge would cause those problems is beyond me. im assuming the high rev on cold start is due to oil being cool has to warm up ..

03-28-2009, 03:24 AM	#8
jkuchta View User's Garage Drives: 2007 Yaris hatch (red) Join Date: Sep 2007 Location: L.A. Posts: 557	Hey Nexus the TB has been on for 260 miles, and no problems, and the improvement is still there!

03-28-2009, 10:59 PM	#11
jkuchta View User's Garage Drives: 2007 Yaris hatch (red) Join Date: Sep 2007 Location: L.A. Posts: 557	Saggio, my TB is not heated. Alex, it would have to be REALLY cold and VERY humid for ice to form in the TB. When a carb freezes up it is caused by the fact that fuel requires energy to vaporize...thus when fuel vaporizes it super cools the air it's in, thus causing the water vapor in the air to turn to ice. Because there is no fuel passing through the TB on our cars, there is no way the air can become supercooled enough to form ice. The cold weather problems people are running into with unheated TB's may be caused by there being too little heat in a less-than-fully-warmed-up engine to fully vaporize the fuel in the intake port of the cylinder head, causing rough running (caused maybe by the resultant lean condition, or an over-rich ECU compensation). This is just a theory of mine, and may not be totally correct, but I think its at least a pretty good guess

04-09-2009, 02:43 AM	#13
MGargano Drives: 2009 Yaris Hatchback Join Date: Feb 2009 Location: NJ Posts: 792	Will this: http://cgi.ebay.com/ebaymotors/TOYOT...Q5fAccessories work with the '09 3-door HB? I'm planning to do the DIY listed in this thread, but I want to make sure this is the correct TB first.

04-09-2009, 02:55 AM	#14
Gideon ★weeaboo★ View User's Garage Drives: 2008 Bayou LB Join Date: Oct 2008 Location: Sunnyvale, CA Posts: 661	Yup, that's the one. Great seller too, bought mine from them.

04-21-2009, 06:22 PM	#16
MGargano Drives: 2009 Yaris Hatchback Join Date: Feb 2009 Location: NJ Posts: 792	For those of you who did the coolant bypass, did you plug the tubes on the TB or just leave them open?

04-21-2009, 06:28 PM	#17
mikenacarato SIPNDEW View User's Garage Drives: 15 STI Join Date: Oct 2008 Location: Brentwood, TN Posts: 2,281	i actually pulled the tubes out with some pliers for a cleaner look and polished it up. so yes they are open.