Increased MPG or HP anyone???? - Toyota Yaris Forums

slvryaris · 10-08-2006, 05:35 PM

Was curious if anyone was experiencing an increase in miles per gallon or horsepower with an aftermarket Intake or exhaust. I was curious to know if an intake or exhaust would benefit other then looking/sounding better. Let me know what you all are using and your thoughts on the product.

Violin · 10-08-2006, 07:16 PM

Give me a couple of weeks and I'll let you know about the AEM cold air intake.

Yaris TTE JWRC · 10-08-2006, 07:32 PM

Quote:

Originally Posted by slvryaris

Was curious if anyone was experiencing an increase in miles per gallon or horsepower with an aftermarket Intake or exhaust. I was curious to know if an intake or exhaust would benefit other then looking/sounding better. Let me know what you all are using and your thoughts on the product.

if u increase th HP u are going to lose MPG, the same thing to Increse MPG = lose HP, u cant get it all, the Farrais only get 8-10 MPG, but the got mass HP. so if the intake give u good HP, then u will lose good MPG.

jcove · 10-13-2006, 10:26 PM

Quote:

Originally Posted by Yaris TTE JWRC

if u increase th HP u are going to lose MPG, the same thing to Increse MPG = lose HP, u cant get it all, the Farrais only get 8-10 MPG, but the got mass HP. so if the intake give u good HP, then u will lose good MPG.

I have just recieved my axle back exhaust from Vibrant. (I'll have pics up on the weekend) It was installed last Friday and I filled up Friday night. I was getting about 500 kms per tank of gas. Right now I have two bars left and I'm already over 450 kms on this tank. My thoughts are that if the engine is flowing better, your running at a lower RPM at the same speed. I've noticed about 500 rpm difference at highway speeds. That way you are using less fuel to go the same speed. Same goes with the intake. I LOVE the sound of my exhaust and it looks sweet.

Ron · 11-19-2006, 07:43 PM

Quote:

Originally Posted by jcove

My thoughts are that if the engine is flowing better, your running at a lower RPM at the same speed. I've noticed about 500 rpm difference at highway speeds. That way you are using less fuel to go the same speed. Same goes with the intake. I LOVE the sound of my exhaust and it looks sweet.

sorry to say, your thoughts are wrong. RPM and speed is dependent on the gearing of the transaxle. ie. if you are going 100km/h in 5th gear, your rpm will ALWAYS be the same. the ONLY way for any changes to affect your rpm-speed relation is if you change your overall wheel diameter.

yes, you may be using less fuel to go the same speed, which is why mods usually increase mileage, but it does not change the rpm-speed relation in any way.

jcove · 11-23-2006, 06:53 AM

Quote:

Originally Posted by Ron

sorry to say, your thoughts are wrong. RPM and speed is dependent on the gearing of the transaxle. ie. if you are going 100km/h in 5th gear, your rpm will ALWAYS be the same. the ONLY way for any changes to affect your rpm-speed relation is if you change your overall wheel diameter.

yes, you may be using less fuel to go the same speed, which is why mods usually increase mileage, but it does not change the rpm-speed relation in any way.

I haven't been keeping up with this thread. Ron, I have to disagree. My RPM is at least 300 - 400 lower at the same speed on the highway. I'm not a tech and I don't really care how at this point, but I know for sure that it's different. All I know is that the needle on my tach is in a different spot at the same speed. I tried it out and watched the diff.

I'm also getting way better gas mileage.

Mr.Yaris · 05-27-2007, 10:25 AM

Quote:

Originally Posted by jcove

I haven't been keeping up with this thread. Ron, I have to disagree. My RPM is at least 300 - 400 lower at the same speed on the highway. I'm not a tech and I don't really care how at this point, but I know for sure that it's different. All I know is that the needle on my tach is in a different spot at the same speed. I tried it out and watched the diff.

I'm also getting way better gas mileage.

Well, you're both right, in a sense. The reason why you see lower RPMs when behind a large vehicle at high speeds is very simple- you're lowering the wind resistance that your car has to "fight" against to maintain it's speed. This also equates to better gas mileage for the same reasons. Less wind resistance = less the engine has to work = greater efficiency of engine's power = better gas mileage.

Snake · 11-21-2006, 04:19 PM

Quote:

Originally Posted by Yaris TTE JWRC

if u increase th HP u are going to lose MPG, the same thing to Increse MPG = lose HP, u cant get it all, the Farrais only get 8-10 MPG, but the got mass HP. so if the intake give u good HP, then u will lose good MPG.

this was the dumbest thing ive ever read before thank you for sharing

eco · 10-08-2006, 11:25 PM

Not so true Yaris TTe,I have a TRD CAI,And I noticed a 3-5% increase in milage,no bull.Actually if you are easy on the throttle at all times,you will get an improvment,but ofcourse when you get the CAI or exhaust,you always want to accelarate faster,because now you can.With the CAI,it actually is like compressed/denser air,which will cause your car to use less gas.zthink of it this way,if its real hot out side,air is less dense,so your car replaces lost air with more gas,so when the air is cooler via cold day or CAI system,them you will have better combustion using less gas,its that simple.As for exhaust,it helps reduce back pressure,and at the right rpm will increase the pulse performance,it like it creates a outward vacum that actually helps pull the exhaust out.If you have both CAI and intake,you will get good improvment if you are easy on the throttle,but can you resist when you get those new performance parts.And you cant compare a ferrari with a 4 banger,you dont even want me to start and explain why a ferrari uses more gas!!!

Black Yaris · 10-08-2006, 11:29 PM

I have a TRD cold air and have noticed some MPG improvment, but, as eco stated, I romp on her a little bit more so it is only like 15-20 more miles per tank. hey even rompin on her hard I am gettin 30-33 MPG

swng · 10-09-2006, 12:57 AM

When my OEM tires expire, I may buy a set of tires with lower rolling resistance and I believe I will get slightly better acceleration and slightly better fuel economy as a result.

Yaris TTE JWRC · 10-09-2006, 01:40 AM

the bottom line, when u upgrade ur car with performance induction and exhaust system, it will take more fuel then the oem sysem, due to the INCREASE OF AIR FLOW, if u think ur CAI, SR, Header, or exhaust increases ur MPG, its all up in ur head.

KSIbucky · 12-17-2006, 12:08 AM

Quote:

Originally Posted by swng

When my OEM tires expire, I may buy a set of tires with lower rolling resistance and I believe I will get slightly better acceleration and slightly better fuel economy as a result.

be care full with tire pressure because I guess that mean they have tighter rubber and it lowers mpg a lot compared to stock

ItsMyDaily · 10-09-2006, 02:21 AM

The only way adding an intake will decrease your mpg is if your busy gunning it all the time to hear the noise of it. When You add these bolt ons such as intake, header, exhaust, it only improves fuel efficiency. Adding more power to the vehicle only makes it easier for the vehicle to move itself. Meaning the engine has less struggle getting the car moving, and also means you are able to apply less gas to get to your desired speed at the right amount of time.

Yes you are adding more air into the engine which helps increase combustion, but you are not adding more fuel to it unless your running an aftermarket ecu. Adding an intake will not make your ecu send more fel into your engine to compensate for the "extra" air. It's set to what it is, and that's that.
If anything with all bolt-ons most cars end up running lean if they don't have an ecu to tune with because the factory ecu will not automatical ajust itself and send more fuel. While this is good for gas, going to lean is not good for the motor on the long run....especially if your always pushing it.

ItsMyDaily · 10-09-2006, 02:24 AM

and if you need an example.....
when I had my S bone stock I was averages with calm driving around 200-210 on a full tank. After adding my intake/header/test pipe/exhaust/flywheel I was making close to 230whp(this was all on the stock ecu). After all those mods I was averaging with calm driving 235-245 on a full tank.

bulldogs2k · 10-18-2006, 12:46 AM

Quote:

Originally Posted by ItsMyDaily

and if you need an example.....
when I had my S bone stock I was averages with calm driving around 200-210 on a full tank. After adding my intake/header/test pipe/exhaust/flywheel I was making close to 230whp(this was all on the stock ecu). After all those mods I was averaging with calm driving 235-245 on a full tank.

I need to get a header and emanage! my goal is 230 to the wheels, but i want to get there with my cats still in place. I will probably buy a test pipe and put my exhaust back on for a quick dyno run.

Get the intake!

Violin · 10-09-2006, 11:24 AM

Basic thermodynamics tells you that all other things being equal, when you lower the intake temp, you'll increase effeciency.

riceboy · 10-13-2006, 10:34 PM

Hey Jcove, long time no see!!! Glad to see that you got things worked out with Vibrant, can't wait to see the pics!!! Hey let me know if you're coming out to the fall tour this Sunday....

10-08-2006, 05:35 PM	#1
slvryaris View User's Garage Drives: 2007 Yaris Sedan S Join Date: May 2006 Location: Indiana Posts: 885	Increased MPG or HP anyone???? Was curious if anyone was experiencing an increase in miles per gallon or horsepower with an aftermarket Intake or exhaust. I was curious to know if an intake or exhaust would benefit other then looking/sounding better. Let me know what you all are using and your thoughts on the product.

10-08-2006, 11:29 PM	#10
Black Yaris der Zeck View User's Garage Drives: '05 Audi A4 1.8t quattro Join Date: Sep 2006 Location: Toledo, OH Posts: 5,231	I have a TRD cold air and have noticed some MPG improvment, but, as eco stated, I romp on her a little bit more so it is only like 15-20 more miles per tank. hey even rompin on her hard I am gettin 30-33 MPG __________________

10-09-2006, 02:21 AM	#14
ItsMyDaily The LittleBastard View User's Garage Drives: 2007 Yaris Liftback Join Date: Sep 2006 Location: Los Angeles, CA Posts: 297	The only way adding an intake will decrease your mpg is if your busy gunning it all the time to hear the noise of it. When You add these bolt ons such as intake, header, exhaust, it only improves fuel efficiency. Adding more power to the vehicle only makes it easier for the vehicle to move itself. Meaning the engine has less struggle getting the car moving, and also means you are able to apply less gas to get to your desired speed at the right amount of time. Yes you are adding more air into the engine which helps increase combustion, but you are not adding more fuel to it unless your running an aftermarket ecu. Adding an intake will not make your ecu send more fel into your engine to compensate for the "extra" air. It's set to what it is, and that's that. If anything with all bolt-ons most cars end up running lean if they don't have an ecu to tune with because the factory ecu will not automatical ajust itself and send more fuel. While this is good for gas, going to lean is not good for the motor on the long run....especially if your always pushing it. __________________ Yaris Mods: 20% Tints Ground wires 2007 Toyota Yaris Liftback - Current 2004 Honda S2000 - Sold 1986 Toyota Corolla SR5 - Sold DIY: Groundwire Kit

10-09-2006, 02:24 AM	#15
ItsMyDaily The LittleBastard View User's Garage Drives: 2007 Yaris Liftback Join Date: Sep 2006 Location: Los Angeles, CA Posts: 297	and if you need an example..... when I had my S bone stock I was averages with calm driving around 200-210 on a full tank. After adding my intake/header/test pipe/exhaust/flywheel I was making close to 230whp(this was all on the stock ecu). After all those mods I was averaging with calm driving 235-245 on a full tank. __________________ Yaris Mods: 20% Tints Ground wires 2007 Toyota Yaris Liftback - Current 2004 Honda S2000 - Sold 1986 Toyota Corolla SR5 - Sold DIY: Groundwire Kit

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
New to Yaris ? Check in here !!	VitzBoy	General Yaris / Vitz Discussion	1953	04-10-2024 08:04 PM
Fuel Economy	swng	Fuel Economy Forum	2089	01-23-2015 06:41 PM
Synthetic oil MPG boost since change	Yaris Dick	General Yaris / Vitz Discussion	29	09-15-2007 08:15 PM
38 hwy miles per gallon, lol, you kiddin me?	pennystocks	General Yaris / Vitz Discussion	70	09-29-2006 08:13 PM

10-08-2006, 07:16 PM	#2
Violin View User's Garage Drives: 2007 Yaris LB Auto Join Date: Jul 2006 Location: New Jersey Posts: 1,592	Give me a couple of weeks and I'll let you know about the AEM cold air intake.

10-08-2006, 11:25 PM	#9
eco Drives: 2007 Black Yaris sedan Join Date: Sep 2006 Location: Atlanta Posts: 884	Not so true Yaris TTe,I have a TRD CAI,And I noticed a 3-5% increase in milage,no bull.Actually if you are easy on the throttle at all times,you will get an improvment,but ofcourse when you get the CAI or exhaust,you always want to accelarate faster,because now you can.With the CAI,it actually is like compressed/denser air,which will cause your car to use less gas.zthink of it this way,if its real hot out side,air is less dense,so your car replaces lost air with more gas,so when the air is cooler via cold day or CAI system,them you will have better combustion using less gas,its that simple.As for exhaust,it helps reduce back pressure,and at the right rpm will increase the pulse performance,it like it creates a outward vacum that actually helps pull the exhaust out.If you have both CAI and intake,you will get good improvment if you are easy on the throttle,but can you resist when you get those new performance parts.And you cant compare a ferrari with a 4 banger,you dont even want me to start and explain why a ferrari uses more gas!!!

10-09-2006, 12:57 AM	#11
swng Drives: 06 3-dr auto RS Join Date: Jan 2006 Location: BC Posts: 1,051	When my OEM tires expire, I may buy a set of tires with lower rolling resistance and I believe I will get slightly better acceleration and slightly better fuel economy as a result.

10-09-2006, 01:40 AM	#12
Yaris TTE JWRC View User's Garage Drives: 07 5spd red Yaris HB 1.5L 16V Join Date: Oct 2006 Location: Surf City HBC ,CA Posts: 265	the bottom line, when u upgrade ur car with performance induction and exhaust system, it will take more fuel then the oem sysem, due to the INCREASE OF AIR FLOW, if u think ur CAI, SR, Header, or exhaust increases ur MPG, its all up in ur head.

10-09-2006, 11:24 AM	#17
Violin View User's Garage Drives: 2007 Yaris LB Auto Join Date: Jul 2006 Location: New Jersey Posts: 1,592	Basic thermodynamics tells you that all other things being equal, when you lower the intake temp, you'll increase effeciency.

10-13-2006, 10:34 PM	#18
riceboy Drives: icebox Join Date: Apr 2006 Location: CAN Posts: 1,003	Hey Jcove, long time no see!!! Glad to see that you got things worked out with Vibrant, can't wait to see the pics!!! Hey let me know if you're coming out to the fall tour this Sunday....