so im 18. been driving since i was 15, but got my license at 18 and soon found myself in my dads 2007 fit sport. he got the car as an alternative to his gas guzzling 49' pickup. needless to say, it very rarely saw anything past 2500 rpm. also he drives a good 35-40 miles to and from work 5 days out of the week. and was like this for 2 years, give or take a few months. fluids were changed on schedule.

now im not sure if this has anything to do with what has happened, but i cant think of anything due to my lack of knowledge of this car.

i got blue led lights for under the dash. the installation was done right without any problems and everything works. we disconnected the battery just for safety and when i put it back in the alarm went of and the radio was locked. i put the code in and everything is well. im assuming thats normal.

when i went to drive it thought, it is SIGNIFICANTLY faster. the response to the throttle is the biggest change. the gears seem to have reset? and im able to achieve a higher speed at any given RPM in any given gear then before. also i feel much more acceleration. im not convinced that somehow i did something unbelievable and i have a "special" fit, but is it possible that the engine just slowly changed or the timing became off over time? and by disconnecting the power and reconnected, the computer was reset bringing everything back to stock?


i appreciate your time and any answers would greatly help.

 

uh i never heard of disconnecting/connecting the battery makes the Fit faster

i mean the Fit does have a 'learning' ECU but they way you describe it sounds a little too drastic.

you might be experiencing the insignificant VTEC of the L15 lol

 

so it really does have some type of learning to preferance designed into it? because if thats the case, i could definatley see why it was slow considering 2 years of my dads driving.

he was getting average 43 MPG. dont ask...

 

you probably just reset the ECU. that's expected if you leave the battery unplugged
for a long time.

your car will adapt to your driving and environment in no time.

 

I thought that the bluelights added 8-12 hp. That could be doing it. hahahaha

 

Did you add any vinyl stickers? They're good for 5whp, especially the "fitfreak" decals.



J/K. Like kenchan said, you reset the ECU. Sounds like your dad drove it pretty mildly so you are just seeing the result of those settings being cleared out. Keep tramping on it for a week or so until the ECU "learns" your way of driving, and you'll be able to keep those gains you feel.

 

uhmm how long youve been driving your car with the N1 muffler? does it really damage your ear even though the silencer is installed? im thinking of buying one thats why

 

wtf? The car gains HP depending how hard you drive it? That makes no sense. The car has 109hp no matter if you shift at 2500 or 6000...there are no gains.

 

Just what he said. The car adapted to your dads driving habits. Since it was never over 2500rpms as you said it learned to drive that way.

Removing the battery terminals reset the ECU so its learning all over again.

 

learning to what? I still don't get it. Some days I shift at 2500rpm and others I shift at 35-4000 all day long. I don't seem to notice any 'learning' going on..

 

the car will learn do drive the way u like it and it saves those settings. when u disconnect the battery and leave it as so, the ecu drains of the power and when u reconnect it, it has to reboot. so when u drive it a new way it relearns a new type of driving style. the only time u really need to do it is when adding aftermarket parts.

 

i know what you mean, sorta.



horsepower numbers are NOT static, your hosepower changes based on rpm

 

Its learning everything. Throttle position, fuel maps, ignition timing, everything.
If you drive like an oldie everything will basically be in limp mod.
If you drive your car hard the ECU will stay in an aggressive mod

I do mixed driving normally. For the past month Ive been driving in oldie mode. Tried to pass someone last week and my car went no where.
Basically felt like it was choking.

So last night I beat the crap out of my car. Today my car drove great.

 

Some people say no need to reset the ECU after adding upgrades-

The ECU is relearning all the time.

see
How long for ecu to adjust to new mods? - 8th Generation Honda Civic Forum

If that is true what about when you do before and after dyno comparison with bolt on upgrades? Doesn't that mean the ECU will provide even better performance if given the chance to learn and adjust from the newly installed upgrade so why dyno right away?

As for the OP-
If your father really did drive very conservatively then the ECU would be trained to provide good mpg for that sort of driving.

When you disconnect the battery (maybe 30 minutes?) you can reset the ECU and allow it to then work with whatever new data you give it.

Your more aggressive driving might feel like you have more power but you might also be burning more fuel at the same time. The Fit is trying to adjust to your driving style to give you a bit better performance at the cost of fuel use. The limits of power are fixed but your air fuel ratios may be adjusted by the ECU for a given load on the engine.

 

Actually there is something to this... but no, not to do with the LED lights

When you disconnect the batter for more than a few minutes the car has to re-learn the driving style and optimize the fuel economy for such driving. You will notice the car will feel different if it is learning your driving style (I was 18 once, I can only imagine you have a heavy right foot too) the throttle especially will feel different.

But rest assured, no real power difference has occurred.