So i just did my install and its not that hard. It is easier with two people so if you have a friend grab em. The hardest part is gettin the belt on and off because the tensioner only gives it so much slack, but it just requires patienct and some muscle. I didnt really romp on it, just deove it around for 10 min, so i will let you know what numbers im boosting.

 

you unplugged your battery during the install I assume?

nates pullys ftw

 

Why would you disconnect the battery just to install the pulley only?

 

to reset the fuel trims i believe

 

I did the air box mod and put the stage 3 pulley on and never disconnected the battery. Would it be wise to do so?

 

i didnt disconnect anything should i do so

 

Im no pro on this...but it resets the pcm memory, allowing it to adjust for your changes better.

Its a good habit to disconnect your battery whenever you do work on your car anyway.

just ask the guy who accidentally dropped a wrench and grounded something out and fried his PCM

 

just unhook the ecm for 5 mins

 

Interesting...I know all directions for all makes changing pullies says to disconnect neg battery side, but I figured they say that just for safety sake. Id like some techs to chime in on this question to see what exactly disconnecting neg will do just for a pulley change only.

 

It resets the ECU as stated above. Your ECU will still learn the new values if you do not unhook the negative cable but it will take longer and in an extreme case could take the ECU off guard because it expects to see one thing but it will see something else.

So yes, for safety purposes and performance disconnect the battery. It will make things go more smoothly.

 

how do i disconnect the damn battery, never did it.

 

Open the trunk, lift the floor up (Where the spare is), get the right socket (I think it's an 8 or a 10, something small I can't remember) and loosen the NEGATIVE terminal and remove it. Make sure to place the cable where it will not contact metal.

 

its a 10mm

 

never thought of this... but if we unhook it.. then re-hook it back up.. do we have to type in a security code for the headunit???? alot of lexus's and nissans are like that.. even buick regals. heh

 

yup its 10mm

and can someone confirm how long?
ive heard alot of different times, I always do mine for 15 minutes at least.
usually i just do it before i start, and most things take longer than that anyway.


reason i ask is....I highly doubt the ecm will clear quickly, theres probably some amount of time where residual power in the circuits can keep things stored.

 

Long term trims take much longer after the battery is disconnected. Also there is no performance benefit....when the car is at WOT the car will not trim. STFT are in use anytime you are in closed loop therefor stored trims will not matter during closed loop conditions, the car will always trim back to 14.7 when a stoich ratio is commanded no matter what learned trim values are.

 

Yes if you have a security code for an aftermarket head unit you will need the code to type it back in when battery is disconnected, but im not sure how long it has to be disconnected before it loses its stored security code.

 

Ive left my battery unplugged overnight before....never had security issues.

 

yea alot of hte ppl who get CELs after installing CAI is because they didnt unplug thier battery...by the way i just ordered a polished 2.9 from nate, cant wait to installl it!!!!

 

huh?

A check engine light indicates a genuine issue. Unplugging the battery to avoid it only delays that recognition.

The solution to the problem is having the mass air flow sensor retuned for the new diameter of the intake piping.

 

aight i got a stage 2 and imma be getting a 2.9 pulley here soon if my money keeps going the way it is. but when i put the new pulley on and reset the battery, it wont erase my stage 2 tune will it???

 

Yeah STFT works all of the time, the only time LTFT is changed is when STFT is taken out of range + or -. So if you reset the ECU it will be learning without other previous written info on the LTFT and ignition advance, this may take longer to actually fully learn in, but since it will be on a clean slate the ECU will not see anything as abnormal.

I know it's not going to actually help performance.
Sorry I worded some things wrong.

 

no...

 

Yea, seems like alot of people will be running 2.9s with stage II. I think its a great idea and a great way to keep the car in a safe range. As for disconnecting the battery, I always do that.

 

I talked to Nate and with our stage 2, exhaust and CAI he said to go ahead and run a 2.85 pulley and it will be fine, so I ordered it. Ill check the afr though when after its installed just to make sure its not way off, but since the stage 2 pulley is pig rich it should be fine.