How hard is it really to tune an AFC on a VQ35 5.5gen??? I really want to put an AFC on my Maxima after I get the headers in 2 weeks but I don't want to spend about $300-$400 for a shop to tune it. Anybody that has tuned their cars by themselves, could you please chime in with some advice. Thanks.

-Justin

 

I have never tuned, but can offer some info. You will need some device, known as an wideband A/F ratio guage. The guages that log are useful. CLICK HERE (I think the one from the link is loggable and is a decent model.) The o2 sensor has to be placed before any cat. You will also need an o2 sensor bung welded in place, so for simplicity reasons, do that before the header install.
You can always barrow one for tunning, but when running a device like you will, I suggest you have a wideband so you can monitor changes. (Changes may be from differant temeratures such as 20* in winter and 90* in the summer...Winter air being more dense.)

Since you won't have the capability to advance spark, I don't think you will need a device to detect knock, but it may prove to be useful.

Hope this is accurate information, and that it helps some what.

 

^^

It's obvious to modify the AFC settings on your own ( I don't like using the word tune in this case) you need a way to monitor your changes, i.e. WBO2.

Also, what a better way to monitor your AFR, but also see how it affects your power curve, in this case, a dyno would seem like a logical wya to monitor all of these parameters (correction %, AFR, power)

 

wideband! but i would go get a dyno tune....there the most efficient ull squeeze the most hp outta ur car with a dyno tune for sure

 

Well I was gonna get some dyno time to tune it...that's what I meant, but I was saying like how hard is it to "modify the AFC settings" on your own with a dyno and using the wideband on the dyno? Like what should I be shooting for etc. etc. Like I said I am really a noob to tuning so...

 

If your paying for dyno time, have a tunner "tune" it for you. (If the correct word isn't tune, then dream of your own word.)

Using google maps, find a nice straight streach of road with no elevation change, and use that as your dyno.

If your going to tune it yourself, then buy a wideband.

This link may help you not screw up your car, in the event that you bought the unit used.

 

Your question is addressed in the stickys, by starting a new thread in here, we are assuming you have read these items, you, clearly, have not done so. READ THE STICKYS.