HOw affetive is it to disconnect your battery when you place a mod on your car... Nothing serious ,, jsut an intake/ehaust... by disconnecting the battery will the ECU re-register the amount of air coming and in exiting,, and will it perform better???

 

From what I understand, disconnecting the battery resets the ECU, it doesnt compensate for modifications. A mail in flash would do the trick. But heres a few pointers first.

- A mail in Dynoflash or standalone ECU or management system is the best way to tune the car for specific mods....not disconnecting the battery.

- cat-back exhausts do not need a flash. Only a Turboback system.

- Putting an intake on the car is a much debated mod. Some love it, some feel it actually hinders performance instead of helping. The stock airbox it more than capable, especially with a drop in filter of some sort. Do some research and searches on this site, and find out if its something you would invest in. Remember this isnt a Civic, where every owner has an intake and exhaust.

- If you do go about putting an intake n the car. Be sure to get it tuned imediately, there is a 95% chance you will experience drivability issues caused by the sensitive MAF. If this is the case id recomend getting a group of mods such as TBE, a fuel pump(which needs a flash regardless), and your intake...then get it flashed. you will def. save money that way.


good luck

 

way to sound technical with the 95% but you pulled that number out of thin air.

 

exhaust disconnecting is not so important, however installing an intake, it is very very important to disconnect the battery.... you should also after disconnecting the battery, turn your ignition key to drain the last bit of juice out of the car to make sure your ecu actually resets...on my 03 i had an led light for the alarm that would blink forever after i took the battery out and actually made a difference when i turned the ignition, the light went out, and also managed to help with the stalling issue somewhat on my BOV

 

87% percent of all statistics are made on the spot.

Seriously though, the Evo ECM doesn't learn to compensate for mods. What resetting it will get is back on the most aggressive map that is in there until it has a reason to change maps.

Jmi11's advice is pretty much right on.

 

Very proffessional put, jmi11. As for re-setting the ecu, I personally re-set mines for any changes I make. To include changing spark plug, changing a dirty air filter etc. The debate goes on for the intakes. The best way I have come up with is to have an intake that creates the same vortex flow that the airbox creates, like the Apexi, RMR or Buschur intakes and have some sort of heat shield. The Apexi worked for me, before and after a custom DynoFlash, no ill affects. I also beleive it in the particular ecu of the car you have. Not all ecu's are the same even if you have an 05 evo like I do. My .02 cents

 

I recently purchased the Perrin intake system, I have seen some people have it on and do not have problems,, while other posts say they have problems with al other intakes, including mine,, so its almost like a 50/50 chance of either develping a problem from the intake,,,,,, or discovering other problems via leaks and tapering....... i jsut bought the intkae cause i should be getting a TurboXs TBE.... so i figured get the air in and out as fast as possible..... but i here this upsets the MAF.... so i am not sure what to do....

 

disconnecting the battery will only reset the ecu and take trouble codes away, you will need some sort of tune to re-register in/out air and a tune is necessary for an intake aswell search to see that you really want a intake it is nothing but trouble for our cars.

 

by saying 95% of the time, i was incinuating that MOST of the time that is the case. Obviously i didnt research it enough to pull a solid percentage. It wasnt meant to be taken as an exact scientific figure.

 

While dropping the pipe, you could bump the hot lead on the starter and cause a fire or blow up the battery.
Be safe, always disconnect the battery when working on your car.

 

It takes 2 seconds, just disconnect it.

 

using a...? havent bothered to look at how to disconnect it.

 

So..... kinda on the topic - - - -

The person i bought my car from had an aftermarket intake on the car and then switched it back to the stock intake when he sold it to me. THe ECU was flashed for this intake, ( and still is). How is my MAF being effected by being flashed for an intake and not having the intake on it? From what i have been told, i will be running a little rich.......

 

EVOgirlie8: You will definitely be running rich if you were flashed for an intake, and it was switched back to the stock airbox. I'm running a mail-in dynoflash for my mods and I'm still running a bit rich, so I can imagine your car. Some people have noticed i still throw a flame or two when pulling hard.