Am I reading that AFR right? Imagine if a tune got that closer to 12.9-13.1

 

This is completely false. Fuel trims are relearned no matter what. If you had to reset the ecu it would be pointless to even put fuel trims in there. They are to compensate for engine wear over time. Adjusting to mods is just an added 'bonus'.

BTW, long term fuel trims adjust based on what short term fuel trims are. Short term fuels trims are meant to stay as close to zero as possible, if they start going rich, say +5, long term will go rich, say +1, and short term will go back to 0. Same if it goes lean. These numbers are just an example and may not be accurate, just demonstrating how it works.

Resetting the PCM will not change how fast, how accurate or the end result of the relearned fuel trims. They are relearned by how many times each cell is 'hit', and how much time is spent there. If you put on a mod and never go wide open throttle, then the cells for 100% load and WOT will never relearn whether you reset the PCM or not.

If you do not understand something, please do not spread misinformation. This is the reason urban myths stay popular, and 'car enthusiasts' look misinformed to real technicians.

 

Incorrect. Read the service manual. There is long term and short term ecu readings.

Long term ones will not change without a ECU RESET. Short term ones will change over time and that is all.

Nah, I rather trust informed people who designed the ECU that work for Nissan and also people who reprogram the ecu like Technosquare who also has posted this info in the past instead of someone like yourself.

 

No way. If that were true it would defeat the whole purpose of having a long term fuel trim. You would have to reset the PCM every xxxx miles in order for the long term fuel trims to be relearned for changes in engine wear among other things.

I know what I know, you think what you want, doesn't bother me.

Technosquare is trying to sell a product, and they are telling you something that supports the need for their product. Hmm, I'm sure that's objective information. It may be true that some mods are too extreme for the fuel trims to fully compensate for them without some tuning, but the LTFT WILL adjust without a PCM reset.

 

Have you read the service manual? Want to ask DaveO with Nissan Sport magazine, or Technosquare? Feel free to contact them.

So you don't trust what technosquare says because they sell a product? They actually know what the ECM does, and it is also in the Service manual.


Again, Open Loop vs Closed loop. Read the service manual.

 

Open Loop vs Closed Loop? When did the topic change. Fuel trim adjustment has nothing to do with that, other than adjustments are made in closed loop, and WOT uses open loop since when we want power we don't care about fuel economy.

Maybe you have to reprogram WOT fuel cells for mods to get the most out of them, hence TS reflash, but to say that all LTFT don't change without resetting the PCM is asinine. Read a book, or better yet look at a scan tool and see it for yourself. It's not hard, create a vacuum leak and see how long it take the LTFT to change.

Edit: This thread is not the place to argue. But if you knew what fuel trims were meant to do, and how they work, you would understand why saying that you must reset the PCM for LTFT to change is ridiculous. Sorry OP. Back on topic...

 

Tell ya what, when you actually have contacts those people or read the service manual you can come back and have a discussion, till then eod.

And btw, it's ECM not PCM.

 

LOL, ECM, PCM, ECU, are all acronyms for the same thing.

PCM=Powertrain Control Module
ECM=Engine Control Module

You do know the engine and the powertrain are the same thing right

 

If you want to be accurate in this thread and try to act like you know something, then use the correct terms. ECM is what controls what we are talking about. And that is what Nissan calls it. I suggest you learn MORE on how Nissan ECMs work before spewing bs.

I am done here. I reviewed your post history and you had a argument about this same thing and others even tried to correct you.

 

Fixed

 

Wow acting like a child now huh? Why would anyone trust you. You should just leave noob.

 

Aww, no sense of humor? BTW I reviewed the threads you were referring to, just to make sure somebody didn't post after I stopped checking them. But there was no one disagreeing with what I posted in either thread about resetting the PCM. Are you making more stuff up to look cool again? Tsk tsk tsk.

I don't care if people trust me or not. But maybe they will at least do their own research instead of listening to an obviously mislead "enthusiast''/"car guy" like you.

 

Seems to me you haven't done any research yet. Have you look at the service manual yet for the Z? We know you don't own one, you own a EVO...so why you here troll?

 

OMG, are you really that ignorant? If you REALLY reviewed my post history you would have actually seen pictures of my Z when I posted them. Still trying to have the last word huh. I tell you what, I'll let you so your ego isn't damaged. Respond however you want, and I promise I won't post in this tread again. Deal................go.

 

i didnt reset my computer at all I Just drive hard maybe its my royal purple and magnetic oil filters I use haha im just playing i dont know what to say but im happy with my numbers. I feel like with those numbers i dont even want to reset it

 

I'm not sure what kind of correction they used but I have my doubts about the numbers

Run it at the track and prove the power

 

never been to the track working on it soon. I figured more people would be happy for me instead of skeptic but it is what it is. The guys at the shop were taken back as well they said the ram air setup i made , made quite a noticeable difference. like i said earlier they expected 255-276 in that area due to other ones they have seen on the dynos there were alot of people there i got second highest NA v6 on that day i was honestly completely shocked

 

It's because we've seen plenty of HR dynos and have a good idea or where they fall with certain mods.

 

have you seen them done with ram air ducting and heat shields with the fujita intakes as well as a Injen track exhaust? Don't take it the wrong way im not trying to be a dick, I do understand what you are saying im just saying they have seen other HRs on that dyno as well with similarnumbers that we are used to seeing for HRs and why was mine different only diffrence was was the heat shields the ram ducting and i have a true dual exhaust the one they tested was a y pipe exhaust.

 

yeah.... no.

pics of custom ram air setup please? did you cut holes in your bumper?