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Originally Posted by Red__Zed 1: no one tracks with a full tank 2: about 5/8ths full when it happened quote from AK This is what he means: Fuel starvation, who
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#2 (permalink) |
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![]() several members here have had fuel starve at 9/10ths full when using r comps at the track. There is a definite flaw in nissan's gas tank design for this car. On street tires, I think fuel starve can happen as early as 7/10ths if you push hard enough on the "right" (or wrong depending on how you look at it) track. if you track this car, you MUST top off the tank between sessions. Very annoying. PS--come on Phunk, get that damn fuel tank fix out dammit. ![]() |
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#3 (permalink) |
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Sometimes you don't want to run a heavy fuel load, though. Especially if you are just doing a ~60 second competitive autocross run.
Though given the circumstances you kind of have to, but we are getting close to a fuel starve solution from what I have read. Currently in testing but so far it has had positive results.
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#4 (permalink) |
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I knew it was Phunk. He's not going to release it until it's 100% ready. Can't rush that!
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with 9/10s? I dont think there is enough empty space in the tank at that point to ever slosh is far enough to one side. Unless the fuel pump is mounted on the the edge of the fuel tank.
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#6 (permalink) | ||
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Quote:
Even my wife has had to keep the tank topped up betwn sessions and she is not as fast as the guys above...yet. (still getting comfortable with the Z vs our last cars that she tracked that were awd). |
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#7 (permalink) | ||
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I hope phunk's solution turns out well. I'm surprised it took this long, since I don't think it should be a difficult fix. Quote:
you can actually hear my car stutter-starve on some of our dragon runs, and god knows I wasn't driving hard. |
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#8 (permalink) |
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what exactly is the defect? The gas would have to be unpumpable by the pump in some sort of fashion, meaning its sloshing to far to one side or there is a divider thats its getting held behind, etc.
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It has to do with the shape of tank, location of the pickup point iirc. Basically, under very hard right handers you'll get fuel cut, usually it is just a hicup and then you're on your way, but depending on the lenght of the turn, level of gas in the tank etc, it can kill your car, pretty serious issue if you're on the track with other cars imo.
there's plenty of threads on this that will explain it better than I'm doing it lol. |
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#10 (permalink) | |
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Soooo, I'm thinking about getting some PMTs to go with my k&n drop ins, you think it's worth it or should I just get some G3's????? ![]() |
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a lot of times you won't notice a mild starve. the car will miss, but keep on going...it feels a lot like vdc kicking in |
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#13 (permalink) |
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I think it's the fuel pickup placement and the tank design. Take a look at this diagram: 172 Fuel Tank :: Fuel & Engine Control :: Genuine Nissan Parts :: 370Z Parts (Z34) 2009-2011 :: Nissan Parts, NISMO and Nissan Accessories - Courtesyparts.com
From reading the fuel starve thread it just seems like the pickup is at the front right of the tank, and given the tank design fuel can run away from the pickup even when it's darn near 9/10ths full if you are in the "right" type of right hand corner. Seems like you need to be on R Comps to successfully starve the pump at 9/10ths, though.
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I never had it in mine either and I have driven the car pretty hard on low fuel. It seems like you really need to be in a long (and hard) enough right hander to keep the fuel away from the pickup long enough to starve it. Probably not going to happen for most people on the street, but definitely presents a big issue on certain tracks.
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