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Old 10-16-2012, 11:02 AM   #1
bidaci
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Default Gas tank level

I have a 2011 Impreza NA that I started autocrossing this year. I am curious as to what you guys are running for gas tank levels. As a NA 2.5 I don't have much power so I am thinking that running a low tank level and saving the weight would be the way to go. But, I am concerned that the remaining gas may slosh around through slaloms and unsettle the rear of the car.

Not that I am at a level that it matters all that much but I am curious. Might as well learn correctly from the start.
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Old 10-16-2012, 11:56 AM   #2
subydude
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Run at 1/4 of a tank if you can. If it starves, add more gas till it's happy. If it doesn't starve run lower and lower until you either have the fuel light on, or it starves. Then make sure you have enough in the tank for the event and roll from there.

I started with an older gas tank that didn't have the baffling the new ones have and had to run 3/4 of a tank. Now with a new tank I plan on running under 1/4.
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Old 10-16-2012, 01:59 PM   #3
wrxracer519
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In the 2011 wrx I have been co-driving this year, we will start with a 1/4 tank for the larger and longer runs. For small lot local events, we run with the gas light on.
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Old 10-16-2012, 05:28 PM   #4
th3118
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Quote:
Originally Posted by wrxracer519 View Post
In the 2011 wrx I have been co-driving this year, we will start with a 1/4 tank for the larger and longer runs. For small lot local events, we run with the gas light on.
Same here.
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Old 10-16-2012, 07:19 PM   #5
bidaci
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Thanks again for the insight. Sure beat trial and error on this one. Never would have guessed I could go to gas light on. Hopefully I can get down below 1/4 tank before this weekend. I tried 1/2 tank and it felt like the gas was effecting the back end of the car. So I went to a full tank and it stabilized the back some but didn't like the thought of an extra 50 lbs.
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Old 10-16-2012, 11:48 PM   #6
PcarPaul
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Quote:
Originally Posted by th3118

Same here.
Make it three. In my '12 WRX the low fuel light was on for my last set of runs at the Pro Finale in Lincoln. Wouldn't have chosen to do it in that situation, but no starvation problems.
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Old 10-23-2012, 02:03 PM   #7
Atomic Rooster
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I my '10 STI I've encountered fuel starvation on street tires when the needle hits the top line of the E. I used to arrive at events with 1/4 tank, but have since gone to starting events with 3/8 to avoid the worry of low fuel on the longer (2km) courses. The STI can burn a surprising amount of gas at an AutoX, but I would guess that the NA engine would be fine starting an event with just enough fuel to avoid the warning light to come on.
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Old 10-23-2012, 03:50 PM   #8
bidaci
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I started with just over 3/8 of a tank. Drove the 40 miles to the event, ran 6 runs and just as I was about home the light came on. Next time I'll start with 1/4 tank to head out. Thanks for the insight!!
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Old 10-24-2012, 06:08 PM   #9
polyol
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STi's come with baffleing in the tank...WRX's and NA's dont IIRC. I would not run my rig on a low tank...its not worth it.
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