[Dsandwick]

I am wondering Why my timing changed after installing a cai. The only things I have done to the truck is hypertech programming and a cai. Befor I did them the timing was at -15 But now the timing is at 9.

 

[danman]

You cant change timing by installing an intake. How are you reading timing? What system are you using to read timing parameters? a timing light? lol

 

[LUBECAKES]

I don't know any exact numbers, but your timing has a range of about 30-40 degrees.
There's no way you changed it with a CAI.

 

[Dsandwick]

I am using a CRP123 to check the timing. Its kinda got me puzzled on what actually changed the timing. The timing should be at 15 correct? Or -15? I need to get this figured out before I do the *2 advance. Do you know if the hyper tech could of changed the timing like this? I have been reading on here about idle air relearn and ecm relearn what this help correct the timing issue?

 

[LUBECAKES]

Thats seems about right, i think mine sits around -15 or so when idling warmed up. I'll check it out next time i fire it up. Keep in mind your timing will be all over the place depending on temerature, load, and rpm.

 

[Dsandwick]

That's the thing I was reading -15 but now its reading any where between 9-12 on the positive side. I have been talking to a lot of mechanics about this and they said more then likely its the cai effecting the off set on timeing my question is this can If I get a jet maf sensor will that fix the issue? Jet Performance 69138 PowrFlo Mass Air Flow Sensor for Infiniti/Nissan/Chrysler | eBay

 

[LUBECAKES]

I can't imagine a CAI ever affecting the timing.

 

[jesselivengood]

disconnect the battery negative. wait 15 minutes, reattach and drive. - 15 is a bad read, you will never have timing in the negative.

 

[LUBECAKES]

Mine sits at about 15-17 idling warm, goes well over 40 while driving.

 

[TitanBlue]

Timing Advance is BTDC. Before Top Dead Center. Spark happens before the piston hits top of the cylinder. (Nissan actually determines in some slightly different method, but irrelevant here). 15 degrees BTDC is the standard, but Nissan range is spec'd 10 to 20 as normal. This is the timing at Idle. As you accelerate/decelerate, the timing varies. You will see readings then, of 40 degrees or more, as Lubecakes said. Be certain you are reading at idle only. Timing Advance typically takes the initial timing and adjust the 15, to 17 BTDC for a bit quicker throttle response. It does not affect the rest of the timing curve. A CAI will never change your timing. Sometimes, the use of a - or + is confusing in conversations on timing and we get it all backwards. Negative Timing is ATDC. Timing is BTDC generally speaking. It takes time (excuse the pun) for the spark to fully ignite the fuel as the piston is flying up and down, that is why it sparks before the piston is up top.