Quote:
Originally Posted by Rooskey
So when I add intake and exhaust to my car I should keep my same fuel ratio. I do not want to add fuel pressure even in this case. If I do go lean on a dyno at least I can correct it.
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#1, an intake and exhaust isn't going to make so great a difference that the ECU can't compensate with fuel trims -- in fact, it doesn't even appear to result in trims that are out of the "normal" range, and I've heard very few reports of driveability quirks that can be clearly traced to those bolt-ons.
Speaking of bolt-ons and AFR's, there are some dynos posted on here from Import Tuner Magazine of a 370Z with intake, intake+exahust, and both + tuning.
Interestingly enough, there is virtually no difference between the AFR's before and after the tune... in other words, you should be fine without tuning for those bolt-ons, although the tune would allow you to optimize performance, it doesn't appear to be mandatory for bolt-ons.
#2, If you really want to play with the AFR's, with or without bolt-ons, see about getting a Cobb Accessport or the Uprev Osirus ECU programmer/reflasher, and schedule some dyno time.
#3 If you were boosted, you would have serious fueling issues with the OEM set-up, and your concerns would be warranted. However, even with a blower or turbo, before going to an AFPR, you'd probably just upgrade to bigger fuel injectors. Tuning the ECU would be a must at that point as well.