Mods which have affected fuel consumption

[exquisit]

following on from my mileage thread, and also looking at a new thread in the integra section

just wondering what mods you have done to the jazz which has affected fuel consumption?
for better or for worse

please discuss
=)

[GU357]

any that affect performance will increase the efficiency of power output but not ur mileage.

also i heard putting a brick on the accelerator makes it pretty bad too.

[ss-rotel]

well, there's 2 ways to look @ this...

But first, fuel comsumption is directly propertional to throttle position and RPM. Soo the longer you are into the loud pedal, the more fuel you'll use, obviously.

SO, if you mod your car to increase power, you are effectively giving it more potential to burn more fuel. increasing the effect of the above.

NOW, if it takes you less time to get to a desired RPM, (or speed), then you are effectly lowering the time you need to have the throttle @ a certian position, and meaning you are actually increasing the potential of using LESS fuel.

i have effectively cut the time it takes me to get to 100km/h down by alot, (i don't know exactly by how much, i haven't had a chance to measure that), so i dont spend as anywere near the time @ 100% throttle i used to, so, normal day - to - day driving hasn't been effected as much as i thought it would, in fact, my car, ever thou it's been turbo'd and had stupidly huge injectors installed, and it's idle was tuned on a cold nite, so during the day, @ temp, it runs rich, i can still get about 7-8l/100 km.

Obviously, i'm creating alot more power and torque, and using alot more fuel in the process, so i'm not SAVING any fuel but like i said, i expected to be getting 200-300km per tank, not 350-400km per tank, considering my last performance car, an AE92 rolla sedan with a 4AGZE Black top SC Engine that only made 95KW @ wheels, and 200nm torque, would only get 300km out of 35L fuel

the best way to save fuel, is to either -
a) drive like a grandma
b) take the least amount of time you need with the lowest % throttle required, to get to speed, and brake ONLY when you have to.

oh, and dont worry about body kits. they are used to create down force, and in turn drag, which will increase your fuel use

[exquisit]

any that affect performance will increase the efficiency of power output but not ur mileage.

also i heard putting a brick on the accelerator makes it pretty bad too.

haha i'll remember to take the brick out!
=p


well, there's 2 ways to look @ this...

But first, fuel comsumption is directly propertional to throttle position and RPM. Soo the longer you are into the loud pedal, the more fuel you'll use, obviously.

SO, if you mod your car to increase power, you are effectively giving it more potential to burn more fuel. increasing the effect of the above.

NOW, if it takes you less time to get to a desired RPM, (or speed), then you are effectly lowering the time you need to have the throttle @ a certian position, and meaning you are actually increasing the potential of using LESS fuel.

i have effectively cut the time it takes me to get to 100km/h down by alot, (i don't know exactly by how much, i haven't had a chance to measure that), so i dont spend as anywere near the time @ 100% throttle i used to, so, normal day - to - day driving hasn't been effected as much as i thought it would, in fact, my car, ever thou it's been turbo'd and had stupidly huge injectors installed, and it's idle was tuned on a cold nite, so during the day, @ temp, it runs rich, i can still get about 7-8l/100 km.

Obviously, i'm creating alot more power and torque, and using alot more fuel in the process, so i'm not SAVING any fuel but like i said, i expected to be getting 200-300km per tank, not 350-400km per tank, considering my last performance car, an AE92 rolla sedan with a 4AGZE Black top SC Engine that only made 95KW @ wheels, and 200nm torque, would only get 300km out of 35L fuel

the best way to save fuel, is to either -
a) drive like a grandma
b) take the least amount of time you need with the lowest % throttle required, to get to speed, and brake ONLY when you have to.

oh, and dont worry about body kits. they are used to create down force, and in turn drag, which will increase your fuel use

thanks for that

so realistically, cai + header back should bring up power a bit and make efficiency better

do you need to reset the ecu when u install cai + exhaust?
does it matter if u dont?
and if u do, how do u reset?

[ouch]

and if u do, how do u reset?

YEAHHHHHHHH!.... how do you reset your ecu?

[melvin]

I think you just take off the negative on the battery.

[ss-rotel]

it shouldn't matter, really.

the ECU in the Jazz is very intelegent, and will tune itself to keep it fairly stoic.
To keep very good fuel economy, the L series Honda engine runs a little lean, and it built to run just shy of detination. To do this, the ECU will actively check the air fuel ratio, and adjusts fuel needed.

adding the exhaust and CAI will mean the engine will breath better, meaning more air in the system, meaning it will run a little leaner, so the ECU will add more fuel.

until it runs 90% throttle and above, then it adds fuel per the TPS and MAF.

so open loop til 90% throttle, and closed from there? Or it's the otherway round, i don't remember... something like that.

you will find that if you decide to run a piggy-back computer, if @ more than 90% throttle, and the ECU detects something out of the ordinary, then it'll go into protection mode, and you wont be able to start the car for 5-10mins. the ECU literally turns off

We've got a Haltech sprint 500 running my car, but the OEM ECU is there running dash and idle, as honda's dont run a secondary BCM, usually. We found that after a healthy run, the car wouldn't idle. as we're still running the stock fuel pump, the engine would lean out a little @ max RPM, and it would freak out, and not idle

Had to setup idle in the Haltech, which was a little bit of mucking around, but not it doesn't stall. runs alittle rich thou...

[GU357]

if u get a HFC some of what rotel said tho is thrown out because the 06+ i believe has a problem with high flow cats.
and the lambda sensor stops working or theres now plug?? not too sure.


runs alittle rich thou...
if u get it to run rich though it will love you everytime u pull the throttle open :P

[exquisit]

interesting...
and how effective is a vafc to touch up the tune for cai + header back exhaust?

[GU357]

unless you know exactly what your doing stay away from the VAFC.
they are like 300 to buy then to get them tuned n that can be pricey i have heard.

the ECU will figure it out anyway.
it will be like shit theres this much air going in, we need this much fuel (inject for a lil longer)
and with the larger exhaust it should help the engine rev (in the right range) making it more power efficient, the ECU has little control or info from the exhaust other then it being told how lean its running from the CAT so it can fix that itself usually.

if you do start running rich thou u will see soot in the exhaust then take it to for tuning

[trism]

The cat doesn't tell the ECU the air fuel ratio. The cat is the catalytic converter. It converts dangerous chemical formulas into less dangerous ones. The oxygen sensor is what tells the ECU about the mixture.

Sent from my custard cannon like Peter North.

[GU357]

Lambda Sensor

Automotive oxygen sensors, colloquially known as O2 sensors, make modern electronic fuel injection and emission control possible. They help determine, in real time, if the air fuel ratio of a combustion engine is rich or lean. Since oxygen sensors are located in the exhaust stream, they do not directly measure the air or the fuel entering the engine. But when information from oxygen sensors is coupled with information from other sources, it can be used to indirectly determine the air-to-fuel ratio - Wikipedia/Oxygen Sensor (http://en.wikipedia.org/wiki/Oxygen_sensor)

i thought that was the point of having them in the CAT (or just before) so it could say how rich or lean its running?

[trism]

what im saying is, the catalytic converter plays no part in the oxygen sensors job. You can have the sensor in the headers if you want, or not run a cat at all, but still run an oxygen sensor, and itll work.

[GU357]

Oh i see what ur saying. i miss read ur last msg, i thought u meant the lambda sensor in the cat doesnt say how much oxygen is there.

u can put the o2 sensor in the headers but more commonly its found in the CAT for emmisions control and because all exhaust goes through the one CAT.

ok sorry LOL

[trism]

ITS NOT IN THE CAT!!!!!!! its before and/or after!!!!

[GU357]

the xforce man lied to me :(

[trism]

he sure did.