^^always getting first dibs....im jealous. i need to mod more:tup:

lets say i bring my car in to get dyno tuned through the access port, will i ever have to bring the car in to get retuned? i heard of something called "tune drift", which is where the ecu resets itself back to stock configuration so therefore you lose the tune you got.

no, the tune is burned on the ECU you will not lose it. You will only have to retune if you do some mods

well lets do it :)

tune drift? thats new...

Yeah you know RCZ, sort of like alzheimers of the ecu species. I think I saw a commercial for some kind of pill that helps the ecu cope with it...

:eekdance:

yup, new to me too. i heard it talked about on my sentra ser forum, its pretty common with our cars once you tune with a afc.

well that is a different story. the AFC just does pluses or minuses so it is simply making changes to the stock ECU numbers so if the stock ECU makes changes due to temps for example the AFC doesn't know this so it keeps taking or adding what it originally had programmed which can make things worse but with Cobb or Osiris you actually change the numbers in the ECU.

Have you played around with the VVEL yet?

Ill be nice and clarify your question despite the fact you told me you had a 370 and you wanted to know where to get it tuned in Chicago. You are correct, you heard about "tune drift" but if you read about it you would have learned that it is a correction the stock ecu is trying to make.

The AFC, as in Apexi AFC is a piggyback fuel solution that adapts the stock ecu fuel tables to get your AFR in the target range. Some one named it "tune drift" because they feel the Apexi AFC is tuning the ecu (which it isn't its just modifying the signal.... and it was drifting away from the settings because the two narrow band 02 sensors on the Sentra are so sensitive they adapt the stock ecu fuel delivery to adjust the compensation the Apexi AFC was making to the AFR to get the AFR back to stock parameters. So someone decided to say that their "tune" was "drifting" as in the modification from the Apexi AFC was variable since the stock ecu still had control over the fuel values dependent on the 02 sensor readings.

It is more respectful to read threads to learn about the 370 if you are interested than to post unrelated questions and compare it to a car with almost zero equivalency. I have seen your posts all over the board asking what a exhaust resonator is to how much power you can get from headers and if it makes the car louder.

:shakes head:

that is one of the things we are waiting for Cobb to add to the software

never asked what a resonator is, simply asked if a resonator in a picture was the resonator. i know what a resonator is. and whats wrong about asking if headers makes the car louder? i actually found out the exact opposite of what i was thinking, the headers dont make the 370z too much louder, where as on my car they made a big differance in loudness. and im not sure whether or not i told u i had a 370z, but if i did it was just to make things easier so i dont have to explain myself. my dad is getting a 370z so thats what i was talking about. and i do do alot of searching the forum, only time i post a question is when i cant find what im looking for.

Fair enough, the general consensus would point you to GRD (Genesis Racing Development) for tuning on a COBB for the Chicago area. On the Sentra, there is a built in pre-cat on the header, hence the increase in volume replacing it with an aftermarket solution.

Enjoy

yes, thats true about the built in pre-cat on the sentra, not only that but that pos pre-cat is know to break up and get sucked into the engine, so on the sentra not only is a header a performance mod, but also an reliablitiy one too. also on the sentra se-r's intake manifold, it has two sets of intake ports, 8 total, one set is open all the time and the other set is closed off with butterfly valves untill the engine hits 5500rpm, then the second set opens allowing more airflow through and also making the engine louder and deeper. why doesnt the vq engine have this design? i would think it would allow more power.

There's no need for it on the VQ37 because it has VVEL.