02-19-2013, 02:21 PM | #43 |
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Good question. I'm not sure how to work that out.
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02-19-2013, 03:25 PM | #44 | |
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You mentioned wanting to be able to inject more fuel into the system aka the same way nitrous is done. We used to use sub-injectors that were RPM-reliant in FI cars in the 90s. These were nothing more than one or two fuel injectors that were tapped into the intake track and would only come on once a certain set RPM was hit. We got away from that when rising rate fuel regulators became more reliable in the early 2000s in conjunction with high-flow fuel pumps. Just my 2 cents. Good luck.
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02-19-2013, 04:26 PM | #45 | |
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02-19-2013, 04:30 PM | #46 | |
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02-19-2013, 04:49 PM | #47 | |
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http://www.greddy.com/upload/file/Rebic_IV.pdf The PDF tells you how it works and shows components that would be in a sub-injector kit. The way things are now, the need for a sub-injector system have pretty much gone away with better injector, fuel pump and fuel management technology, BUT there's still a niche for this sort of system. Apparently, some people are still using them. A rising rate fuel pressure regulator is the way to go if one is experiencing lean-out in the higher RPM band. Tuning it on a dyno is essential.
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02-19-2013, 04:50 PM | #48 |
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That holds true for so many things, even now.
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02-20-2013, 10:24 AM | #49 |
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In regards to AFM, we have an 08 Impala w/3.9 v6 AFM. You set the DIC for instant fuel mileage & watch it change back & forth between 3 & 6 cyl mode. It changes back to 6 with the slightest of throttle pressure increase whether accelerating or a slight increase in grade. I don't see how you could experience a lack of performance at any time, just hit the throttle. Also the switch back & forth is almost imperceptable. The only way I can feel it is if I lean my head against the window glass. I would think a v8/v4 would be even smoother.
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02-20-2013, 11:02 AM | #50 | |
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...But...my gosh...when I shopped for my '11, the L99s with AFM were rated at "1" mpg hwy mileage greater than the manual trans cars..."ONE!"...I could see AFM being the greatest thing since a pocket in a shirt if the mileage gains were vastly greater than those without AFM... Just seems like a ton of technology and what-not for very little gain in mpg...on top of what is perceived as driving a "performance" car on four cylinders...dunno... |
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02-20-2013, 12:07 PM | #51 |
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I was thinking, and this may sound dumb but the AFM on the L99 is controlled by oil pressure and load ratings into the ECM and blah blah blah but what if you could use a "line lock" system to keep it in 4cyl mode on the highway? I would think these cars could get 30-35mpg highway in 4cyl mode and that could help the CAFE and possibly keep from paying the dreadful gas guzzler tax..I mean really in 4cyl mode, it is a 3.1L 215hp motor I would assume that should be enough to keep the car going 75mph on the highway?
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02-20-2013, 12:58 PM | #52 | ||
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02-20-2013, 01:45 PM | #53 | |
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Anyway, what good is a V8 if it is locked in 4cyl mode most of its life?
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02-20-2013, 02:02 PM | #54 | |
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...Like it or not, it seems AFM is here to stay...and if it is, and can be capable of significantly better mileage, it might help keep around the availablility of V-8's that don't have AFM... |
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02-20-2013, 02:08 PM | #55 | |
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02-20-2013, 02:21 PM | #56 | ||
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example: dod off (always V8) dod on (just like L99 cars, the ability to go into 4 cylinder mode) |
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