afc and egt? - Page 2 - Toyota Yaris Forums

o89canucks · 09-15-2009, 03:17 PM

Quote:

Originally Posted by Tamago

and what car has a cast iron exhaust manifold?

aluminum pistons?

My S60R has a cast iron manifold, haven't modded my pos yaris yet as it is my daily driver, so I haven't checked to see what is in it.

Tamago · 09-15-2009, 03:19 PM

Quote:

Originally Posted by o89canucks

My S60R has a cast iron manifold, haven't modded my pos yaris yet as it is my daily driver, so I haven't checked to see what is in it.

the manifold is tubular steel.

with fragile little aluminum pistons inside the engine

don't lean it out.

o89canucks · 09-15-2009, 03:32 PM

so if most pistons are aluminum, then why would the Yaris pistons be any different than any other "fragile" aluminum piston when it is leaned out. If that were the case the the 2g eclipse's "fragile" aluminum pstons shouldn't have held up, correct?

and with the exhaust manifold being tubular steel, it would fail -way- before the pistons ever did.

Tamago · 09-15-2009, 03:35 PM

Quote:

Originally Posted by o89canucks

so if most pistons are aluminum, then why would the Yaris pistons be any different than any other "fragile" aluminum piston when it is leaned out. If that were the case the the 2g eclipse's "fragile" aluminum pstons shouldn't have held up, correct?

and with the exhaust manifold being tubular steel, it would fail -way- before the pistons ever did.

have you ever seen a 1nzfe piston in person? 1nzfe connecting rod? no? i have. they're fragile, under-engineered.

this still does not account for the fact that a DSM is gonna get great gas mileage because of the turbo, and a 1nzfe is NOT going to gain fuel efficiency by leaning the engine out excessively.

do me a favor

go drive your yaris around at 19:1 AFR for the sake of the almighty fuel mileage and see how long your engine lasts

o89canucks · 09-15-2009, 03:40 PM

again, I don't tear apart my pos yaris that I drive to work every day to make it a race car, so no. I don't know what the internals look like.

then again, I don't expect a yaris to be an autocross or drag racing machine.

Tamago · 09-15-2009, 03:45 PM

Quote:

Originally Posted by o89canucks

again, I don't tear apart my pos yaris that I drive to work every day to make it a race car, so no. I don't know what the internals look like.

then again, I don't expect a yaris to be an autocross or drag racing machine.

pot calling the kettle black, you want to lean out a high-compression N/A engine for the sake of fuel milege, because "some guy with a 1993 eclipse turbo did it" thinking it's a good idea.

RHDVIPbB · 09-15-2009, 03:48 PM

turbo guys usually run higher octane too.

o89canucks · 09-15-2009, 03:50 PM

Quote:

Originally Posted by Tamago

pot calling the kettle black, you want to lean out a high-compression N/A engine for the sake of fuel milege, because "some guy with a 1993 eclipse turbo did it" thinking it's a good idea.

I asked if anyone had tried to lean it out for better fuel mileage, this forum is about fuel mileage, is it not? I was seeing if I could get some additional fuel mileage out of my daily driver is all.

Penguin Garage · 09-15-2009, 03:59 PM

Quote:

Originally Posted by Penguin Garage

how much adjustment can the AFC do on the yaris?

2%, 5%, 10%, 25% adjustment?

This is an expensive test to save $40 a tank, but I'd be interested to see it perform.

anyone care to comment?

RHDVIPbB · 09-15-2009, 04:04 PM

Quote:

Originally Posted by Penguin Garage

anyone care to comment?

the afc increments change depending on what rpm it is. I had an AFC2 on my Conquest and it was a great tool. There is more adjustments you can make. Although I am not sure how the AFC Neo works and what you are capable of doing with OBD2 and up.

Doesn't the AEM FIC allow you to adjust a few different parameters of the motor?

Tamago · 09-15-2009, 04:05 PM

Quote:

Originally Posted by RHDVIPbB

Doesn't the AEM FIC allow you to adjust a few different parameters of the motor?

fuel and timing (retard only)

RHDVIPbB · 09-15-2009, 04:10 PM

Quote:

Originally Posted by Tamago

fuel and timing (retard only)

crap. Guess its Autronic for me then.

Penguin Garage · 09-15-2009, 04:49 PM

Quote:

Originally Posted by RHDVIPbB

the afc increments change depending on what rpm it is. I had an AFC2 on my Conquest and it was a great tool. There is more adjustments you can make. Although I am not sure how the AFC Neo works and what you are capable of doing with OBD2 and up.

Doesn't the AEM FIC allow you to adjust a few different parameters of the motor?

I'll have to look into it more, but i don't think the piggy backs can adjust fuel enough to make it worthwhile.

you could probably save more fuel by driving differently then you could by leaning it out 2.5%.

my POS Yaris is > * :D

Tamago · 09-15-2009, 05:54 PM

because it's turbo is the reason the DSM could safely lean out the engine and improve fuel economy (because he's not leaning out as much as you'll have to on the yaris to yield any gains).

basslover911 · 10-10-2009, 07:10 PM

You can do it, but not that route. Whoever did that was lying.

Those aftermarket piggyback systems can only control open loop operation, and at "cruising mode" its always closed loop so you have to fool something else (like the signal from the 02 sensor). Now this has to be implemented so it only leans the car out under constant throttle (no acceleration)- otherwise knock will occur and your engine will blow.

So yes, you can do it, but only to a certain extent. Honda's "lean burn" system goes up to 25.1 I believe, we could probably get away with 17.1, but I doubt anything else (those Honda engines have specially designed pistons which can burn a much leaner mixture, while we don't (just conventional pistons)

basslover911 · 10-10-2009, 07:11 PM

BTW, also keep in mind that with leaner mixtures you produce considerably more N0x levels, so your kind of polluting more... if you care :D

09-15-2009, 03:32 PM	#21
o89canucks Mechanic from hell Drives: 2007 Toyota Yaris Sedan Join Date: Sep 2009 Location: St. Louis, MO Posts: 20	so if most pistons are aluminum, then why would the Yaris pistons be any different than any other "fragile" aluminum piston when it is leaned out. If that were the case the the 2g eclipse's "fragile" aluminum pstons shouldn't have held up, correct? and with the exhaust manifold being tubular steel, it would fail -way- before the pistons ever did. __________________ 2007 Black Sand Toyota Yaris Sedan AT 2006 Sonic Blue Volvo S60R AWD 6MT

09-15-2009, 03:40 PM	#23
o89canucks Mechanic from hell Drives: 2007 Toyota Yaris Sedan Join Date: Sep 2009 Location: St. Louis, MO Posts: 20	again, I don't tear apart my pos yaris that I drive to work every day to make it a race car, so no. I don't know what the internals look like. then again, I don't expect a yaris to be an autocross or drag racing machine. __________________ 2007 Black Sand Toyota Yaris Sedan AT 2006 Sonic Blue Volvo S60R AWD 6MT Last edited by tk-421; 09-15-2009 at 10:24 PM.

09-15-2009, 03:48 PM	#25
RHDVIPbB Right beside you, wave Drives: 08 PBM Yaris Sedan Join Date: Oct 2008 Location: Louisville, KY Posts: 742	turbo guys usually run higher octane too. __________________ 2008 Toyota Yaris Sedan. Pacific Blue Mica. Custom vinyl eyebrows, color matched interior trim pieces, Vios lip spoiler, 17" Maas rims 2010 Scion xB 7.0 Release Series. 1535 of 2000. Murasaki. Stock with TRD springs.

10-10-2009, 07:10 PM	#33
basslover911 Drives: Future Yaris! Join Date: Oct 2009 Location: Fort Worth, Texas Posts: 38	You can do it, but not that route. Whoever did that was lying. Those aftermarket piggyback systems can only control open loop operation, and at "cruising mode" its always closed loop so you have to fool something else (like the signal from the 02 sensor). Now this has to be implemented so it only leans the car out under constant throttle (no acceleration)- otherwise knock will occur and your engine will blow. So yes, you can do it, but only to a certain extent. Honda's "lean burn" system goes up to 25.1 I believe, we could probably get away with 17.1, but I doubt anything else (those Honda engines have specially designed pistons which can burn a much leaner mixture, while we don't (just conventional pistons)

10-10-2009, 07:11 PM	#34
basslover911 Drives: Future Yaris! Join Date: Oct 2009 Location: Fort Worth, Texas Posts: 38	BTW, also keep in mind that with leaner mixtures you produce considerably more N0x levels, so your kind of polluting more... if you care :D