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Old 05-05-2003, 11:00 AM   #1
goobie
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Join Date: Jul 2001
Location: White Rock BC, Canada
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2006 WRX Wagon
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Question Hit Rev Limiter Early ?!?

I am wondering if someone could explain this phenomenon to me:

At the track this pasted weekend, when accelerating out of a corner in second gear at WOT I would hit the fuel cut at about 5500RPM! It acted as it normally would as if I revved the engine out to 6250RPM. This happend to me at the exact same 2 turns on the track every time I had to shift back to second. So for a couple of laps I played with it a bit and noticed that in any other gear I could redline the engine at 6250 before hitting cut and if I didn't put the gas to the floor when accellerating in 2nd I could rev the engine out to 6250 before the rev limiter slapped me on the wrist.

Please excuse the above convoluted description. Basically what I want to know is: Why would my rev limiter kick in at 5500RPM in second gear and only at WOT while in other gears or with less throttle the rev limiter would kick in at a the normal 6250RPM?

I am very interested in your replies!

Cheers,
Chad
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Old 05-05-2003, 11:06 AM   #2
BOY
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I'm gonna guess fuel slosh... how much fuel was in the tank and how hard of a corner was it? BTW, what were you doing looking at your tach in the middle of the corner?? look at the track/next corner, don't worry about your gauges.
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Old 05-05-2003, 11:08 AM   #3
trojan9x
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Did you have less than 1/2 tank of gas? You were probably suffering from fuel starvation if that's the case. Common in our cars (well in the 2.5RS at least).
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Old 05-05-2003, 11:40 AM   #4
goobie
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Default Fuel starvation hey??

Hmm I never though about that, kinda makes sense.
The corners were pretty tight. One being almost a complete hair-pin and yes I was most likely under a half tank. So fuel starvation sounds quite probable! Thanks guys! Is there any problem NASIOC can't solve (exept clutch shutter of course)

Quote:
BTW, what were you doing looking at your tach in the middle of the corner?? look at the track/next corner, don't worry about your gauges.
I wasn't looking at my gauge in the middle of a corner, I was acceleration out of the corner which BTW exited to a nice long straight, so looking at the next corner wasn't a major concern at that point in time,and it does kind of grab your attention when you are expecting another 750 RPM out of your engine and suddenly you're at fuel-cut and forced to shift early.

Well I guess the next logical question is: Is there a way to stop fuel starvation from hard cornering (other than keeping the tank full all the time)???

Cheers,
Chad
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Old 05-05-2003, 11:44 AM   #5
BOY
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tank foam but I wouldn't even consider it for a street car.
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Old 05-05-2003, 11:46 AM   #6
goobie
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Default Tank Foam?

What is tank foam? Or is it just as it sounds?

Chad
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Old 05-05-2003, 07:15 PM   #7
Storm
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I'm pretty sure I posted a write up about how I cured our fuel starvation troubles. Try a search for it or posts by me.

FWIW....I used foam in our tank along with other things. No problems at all with it.

Jay Storm
www.sourcemotorsports.com
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