| Zuffy | 06-15-2004 10:14 AM |
What fuel level do you guys run at auto-x?
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I was wondering what fuel levels people like to run their cars at for auto-x events. I guess the considerations are, less weight, balance of the car, sloshing of the fuel, and possible fuel starvation.
| KC | 06-15-2004 10:19 AM |
My 2002 Wagon can run all the way 'till empty.
| MNbiker | 06-15-2004 10:48 AM |
I can go about 3 runs past the point where the fuel light goes on.
-Steve
(another '02 wagon)
p.s. KC can't QUITE go until empty. I seem to remember him having fuel starvation problems at Peru last year. ;)
-Steve
(another '02 wagon)
p.s. KC can't QUITE go until empty. I seem to remember him having fuel starvation problems at Peru last year. ;)
| KC | 06-15-2004 10:50 AM |
Well that's becuse there was like a gallon left.. but I'm deep into the empty ... like starting to run when the light comes on. :) It was the challenge rounds that I needed gas for. :D
| del105 | 06-15-2004 11:12 AM |
I like to start when the light comes on or a bit less than 1/4 tank if I have co-driver.
| Zuffy | 06-15-2004 11:44 AM |
WOW, that's IMPREZIVE that our cars can run so low fuel. :banana: for great fuel system design!
| TimStevens | 06-15-2004 11:44 AM |
I tend to find myself autocrossing with whatever fuel level is in the tank when I show up :)
| dowroa | 06-15-2004 11:46 AM |
[QUOTE][i]Originally posted by TimStevens[/i]
[B] I tend to find myself autocrossing with whatever fuel level is in the tank when I show up :) [/B][/QUOTE]
Bingo!
- dow
[B] I tend to find myself autocrossing with whatever fuel level is in the tank when I show up :) [/B][/QUOTE]
Bingo!
- dow
| trhoppe | 06-15-2004 11:54 AM |
With a codriver we start at 1/4 tank.
In toledo this weekend we ran through the 1/4 tank and another 5 gallon can :eek:
-Tom
In toledo this weekend we ran through the 1/4 tank and another 5 gallon can :eek:
-Tom
| dwx | 06-15-2004 12:06 PM |
I have no idea how the WRX fuel tank is designed but it's one of the best no starvation cars I've ever seen. I usually run about an 1/8th tank because with the R tires and sweepers it will cut out if the light is on. The RS on the other hand sucks and so does the STI, I don't know what they changed...
| NeoteriX | 06-15-2004 12:26 PM |
[QUOTE][i]Originally posted by dwx[/i]
[B] I have no idea how the WRX fuel tank is designed but it's one of the best no starvation cars I've ever seen. I usually run about an 1/8th tank because with the R tires and sweepers it will cut out if the light is on. The RS on the other hand sucks and so does the STI, I don't know what they changed... [/B][/QUOTE]
It's the AWD.
[B] I have no idea how the WRX fuel tank is designed but it's one of the best no starvation cars I've ever seen. I usually run about an 1/8th tank because with the R tires and sweepers it will cut out if the light is on. The RS on the other hand sucks and so does the STI, I don't know what they changed... [/B][/QUOTE]
It's the AWD.
| MNbiker | 06-15-2004 01:20 PM |
[QUOTE][i]Originally posted by NeoteriX [/i]
[B]It's the AWD. [/B][/QUOTE]
:huh:
[B]It's the AWD. [/B][/QUOTE]
:huh:
| thechickencow | 06-15-2004 01:25 PM |
[QUOTE][i]Originally posted by MNbiker[/i]
[B] :huh: [/B][/QUOTE]
:huh: :huh:
[B] :huh: [/B][/QUOTE]
:huh: :huh:
| Corey | 06-15-2004 01:28 PM |
[QUOTE][i]Originally posted by thechickencow [/i]
[B]:huh: :huh: [/B][/QUOTE]
:huh: :huh: :huh:
[B]:huh: :huh: [/B][/QUOTE]
:huh: :huh: :huh:
| KC | 06-15-2004 01:35 PM |
[QUOTE][i]Originally posted by MNbiker[/i]
:huh:
[QUOTE][i]Originally posted by thechickencow[/i]
:huh: :huh:
[QUOTE][i]Originally posted by Corey[/i]
:huh: :huh: :huh: [/QUOTE][/QUOTE][/QUOTE]
:huh: :huh: :huh: :huh:
:huh:
[QUOTE][i]Originally posted by thechickencow[/i]
:huh: :huh:
[QUOTE][i]Originally posted by Corey[/i]
:huh: :huh: :huh: [/QUOTE][/QUOTE][/QUOTE]
:huh: :huh: :huh: :huh:
| trhoppe | 06-15-2004 02:15 PM |
[QUOTE][i]Originally posted by MNbiker[/i]
[B] :huh: [/B][/QUOTE]
[QUOTE][i]Originally posted by thechickencow[/i]
[B] :huh: :huh: [/B][/QUOTE]
[QUOTE][i]Originally posted by Corey[/i]
[B] :huh: :huh: :huh: [/B][/QUOTE]
[QUOTE][i]Originally posted by KC[/i]
[B] :huh: :huh: :huh: :huh: [/B][/QUOTE]
[B] :huh: [/B][/QUOTE]
[QUOTE][i]Originally posted by thechickencow[/i]
[B] :huh: :huh: [/B][/QUOTE]
[QUOTE][i]Originally posted by Corey[/i]
[B] :huh: :huh: :huh: [/B][/QUOTE]
[QUOTE][i]Originally posted by KC[/i]
[B] :huh: :huh: :huh: :huh: [/B][/QUOTE]
| skuttledude | 06-15-2004 02:26 PM |
I thought ti wasn't a good idea to run that low on fuel with our turbo'd cars. (especially around AutoX)
Please correct me if I'm wrong
Please correct me if I'm wrong
| afpdl | 06-15-2004 02:38 PM |
[QUOTE][i]Originally posted by Davis K Powers[/i]
[B] I thought ti wasn't a good idea to run that low on fuel with our turbo'd cars. (especially around AutoX)
Please correct me if I'm wrong [/B][/QUOTE]
As long as you dont get fuel starvation why would it matter how much fuel is in the tank?
[B] I thought ti wasn't a good idea to run that low on fuel with our turbo'd cars. (especially around AutoX)
Please correct me if I'm wrong [/B][/QUOTE]
As long as you dont get fuel starvation why would it matter how much fuel is in the tank?
| TyrannoSullyRex | 06-15-2004 02:50 PM |
I only got fuel starvation once when running Dstock co-driving, the light came on when gridding up the car, ran the car to warm stuff up, by the third run (well 6 runs, had a co-driver) the car sputtered in a long sweeper.
| Jason02WRXCT | 06-15-2004 03:03 PM |
Kinda off topic but how much fuel do you run on the track? I am going to Lime Rock next week and was just curious.
Jason
Jason
| afpdl | 06-15-2004 03:04 PM |
[QUOTE][i]Originally posted by Jason02WRXCT[/i]
[B] Kinda off topic but how much fuel do you run on the track? I am going to Lime Rock next week and was just curious.
Jason [/B][/QUOTE]
Start with a full tank because you are going to end up with an empty one anyway.
[B] Kinda off topic but how much fuel do you run on the track? I am going to Lime Rock next week and was just curious.
Jason [/B][/QUOTE]
Start with a full tank because you are going to end up with an empty one anyway.
| Jason02WRXCT | 06-15-2004 03:05 PM |
Thats what I was figuring.
Thanks
Thanks
| DrBiggly | 06-15-2004 03:53 PM |
[QUOTE][i]Originally posted by NeoteriX[/i]
[B] It's the AWD. [/B][/QUOTE]
:huh: :huh: :huh: :huh: :huh:
Are you serious?
[B] It's the AWD. [/B][/QUOTE]
:huh: :huh: :huh: :huh: :huh:
Are you serious?
| Zuffy | 06-15-2004 05:48 PM |
[QUOTE][i]Originally posted by TyrannoSullyRex [/i]
[B]I only got fuel starvation once when running Dstock co-driving, the light came on when gridding up the car, ran the car to warm stuff up, by the third run (well 6 runs, had a co-driver) the car sputtered in a long sweeper. [/B][/QUOTE]
How low was the level in the tank?
[B]I only got fuel starvation once when running Dstock co-driving, the light came on when gridding up the car, ran the car to warm stuff up, by the third run (well 6 runs, had a co-driver) the car sputtered in a long sweeper. [/B][/QUOTE]
How low was the level in the tank?
| trhoppe | 06-15-2004 06:02 PM |
[QUOTE][i]Originally posted by Zuffy[/i]
[B] How low was the level in the tank? [/B][/QUOTE]
Uhhh, did you read his post? You quoted it :lol:
"the light came on when gridding up the car, ran the car to warm stuff up, by the third run (well 6 runs, had a co-driver) the car sputtered"
[B] How low was the level in the tank? [/B][/QUOTE]
Uhhh, did you read his post? You quoted it :lol:
"the light came on when gridding up the car, ran the car to warm stuff up, by the third run (well 6 runs, had a co-driver) the car sputtered"
| NeoteriX | 06-15-2004 06:11 PM |
[QUOTE][i]Originally posted by DrBiggly[/i]
[B] :huh: :huh: :huh: :huh: :huh:
Are you serious? [/B][/QUOTE]
Dang. No one here has a sense of humor huh? :lol:
[B] :huh: :huh: :huh: :huh: :huh:
Are you serious? [/B][/QUOTE]
Dang. No one here has a sense of humor huh? :lol:
| Orion | 06-15-2004 06:33 PM |
one driver: fuel light on
2 drivers: 1/8 or so
2 drivers: 1/8 or so
| TyrannoSullyRex | 06-15-2004 06:46 PM |
[QUOTE][i]Originally posted by trhoppe[/i]
[B] Uhhh, did you read his post? You quoted it :lol:
"the light came on when gridding up the car, ran the car to warm stuff up, by the third run (well 6 runs, had a co-driver) the car sputtered" [/B][/QUOTE]
Tom Hoppe: Reading Comprehension Enforcer.
:lol:
[B] Uhhh, did you read his post? You quoted it :lol:
"the light came on when gridding up the car, ran the car to warm stuff up, by the third run (well 6 runs, had a co-driver) the car sputtered" [/B][/QUOTE]
Tom Hoppe: Reading Comprehension Enforcer.
:lol:
| XT6Wagon | 06-15-2004 07:24 PM |
AutoX... I try for nothing less than a "tall" 1/4. usualy 1/2 a tank is better as its REALLY hard to run a top time if the car shuts off at the end of every long 180 sweeper.
For a track day? Start with a full tank. Lol 4mpg or so at WOT.
For a track day? Start with a full tank. Lol 4mpg or so at WOT.
| DrBiggly | 06-15-2004 09:08 PM |
[QUOTE][i]Originally posted by NeoteriX[/i]
[B] Dang. No one here has a sense of humor huh? :lol: [/B][/QUOTE]
This is why I said "Are you serious" ;)
[url]http://forums.nasioc.com/forums/showthread.php?s=&threadid=459677[/url]
It's a few minutes read for sure...I keep updating it with stupid things my roommate does/says.
[B] Dang. No one here has a sense of humor huh? :lol: [/B][/QUOTE]
This is why I said "Are you serious" ;)
[url]http://forums.nasioc.com/forums/showthread.php?s=&threadid=459677[/url]
It's a few minutes read for sure...I keep updating it with stupid things my roommate does/says.
| Storm | 06-15-2004 09:10 PM |
We (still) have to run a full tank or it will starve at anything 3/4 or less. It gets worse as the level drops.
I have a fix, but haven't gotten to installing it yet.......Hopefully it'll be in for this weekend.
Jay Storm
I have a fix, but haven't gotten to installing it yet.......Hopefully it'll be in for this weekend.
Jay Storm
| dwx | 06-15-2004 09:41 PM |
[QUOTE][i]Originally posted by Storm [/i]
[B]We (still) have to run a full tank or it will starve at anything 3/4 or less. It gets worse as the level drops.
I have a fix, but haven't gotten to installing it yet.......Hopefully it'll be in for this weekend.
Jay Storm [/B][/QUOTE]
That sucks. Can you use a fuel pump similar to the STI one with the extra chamber?
Phil
[B]We (still) have to run a full tank or it will starve at anything 3/4 or less. It gets worse as the level drops.
I have a fix, but haven't gotten to installing it yet.......Hopefully it'll be in for this weekend.
Jay Storm [/B][/QUOTE]
That sucks. Can you use a fuel pump similar to the STI one with the extra chamber?
Phil
| speedyHAM | 06-15-2004 11:05 PM |
Did they change the fuel pump design between '96 and '97? I have run my '96L in AutoX with so little fuel in the tank that when I made it to the gas station (about 1/4 mile from the site) I put in 13.2 gallons (13.1 gallon tank according to the owners manual) and I have never had any problems with fuel starvation.
| WRXedUSA | 06-15-2004 11:19 PM |
1/4 tank.
always.
always.
| NeoteriX | 06-16-2004 12:16 AM |
[QUOTE][i]Originally posted by DrBiggly[/i]
[B] This is why I said "Are you serious" ;)
[url]http://forums.nasioc.com/forums/showthread.php?s=&threadid=459677[/url]
It's a few minutes read for sure...I keep updating it with stupid things my roommate does/says. [/B][/QUOTE]
Ahahah, yeah I've read that thread. Didn't make the connection though. D'oh!
[B] This is why I said "Are you serious" ;)
[url]http://forums.nasioc.com/forums/showthread.php?s=&threadid=459677[/url]
It's a few minutes read for sure...I keep updating it with stupid things my roommate does/says. [/B][/QUOTE]
Ahahah, yeah I've read that thread. Didn't make the connection though. D'oh!
| DrBiggly | 06-16-2004 12:49 AM |
[QUOTE][i]Originally posted by NeoteriX[/i]
[B] Ahahah, yeah I've read that thread. Didn't make the connection though. D'oh! [/B][/QUOTE]
That's ok; at least I know you're capable of using the Internet and can probably at least figure out how to open a door correctly. :p I should just use that phrase as my signature. I apparently have hundreds of people subscribed to the thread as I update it every week or two perhaps?
It never ends...
Folks have begged me to bring him to meets. I don't want to see him when I come home, let alone take him somewhere. :rolleyes: :lol:
[B] Ahahah, yeah I've read that thread. Didn't make the connection though. D'oh! [/B][/QUOTE]
That's ok; at least I know you're capable of using the Internet and can probably at least figure out how to open a door correctly. :p I should just use that phrase as my signature. I apparently have hundreds of people subscribed to the thread as I update it every week or two perhaps?
It never ends...
Folks have begged me to bring him to meets. I don't want to see him when I come home, let alone take him somewhere. :rolleyes: :lol:
| MK19_ | 06-16-2004 03:20 AM |
I like to be at right at 1/4 tank in my 02 wagon. Seems to never have any issues that low ;)
| MattDell | 06-16-2004 04:36 PM |
I have to have a full tank or I get fuel starvation. Plus, I feel the better weight distribution is worth the extra weight.
| trhoppe | 06-16-2004 04:39 PM |
[quote]Plus, I feel the better weight distribution is worth the extra weight.[/quote]
Almost never is an extra 100lbs worth of "good distribution" worth the extra weight.
-Tom
Almost never is an extra 100lbs worth of "good distribution" worth the extra weight.
-Tom
| Zuffy | 06-16-2004 06:03 PM |
[QUOTE][i]Originally posted by trhoppe [/i]
[B]Almost never is an extra 100lbs worth of "good distribution" worth the extra weight.
-Tom [/B][/QUOTE]
For sure weight is the enemy of speed.
[B]Almost never is an extra 100lbs worth of "good distribution" worth the extra weight.
-Tom [/B][/QUOTE]
For sure weight is the enemy of speed.
| MattDell | 06-16-2004 09:20 PM |
Well the car is more balanced. Perhaps it isn't "actually" faster, but it certainly feels a lot better.
| Storm | 06-16-2004 10:06 PM |
Without going over info that's already been posted......yes, I built a surge tank like the Sti has. I couldn't see spending $450+ on something I can make for less than $20.
[QUOTE][i]Originally posted by dwx [/i]
[B]That sucks. Can you use a fuel pump similar to the STI one with the extra chamber?
Phil [/B][/QUOTE] A quick search for fuel starvation will bring up a wealth of info.
SpeedyHAM: The L tank is different than the larger tanks. It's shape lends itself to not starving as much. I can run down below 1/8th on my 96L due to the shape of the tank. The fuel line routing has alot to do with this too....
Jay Storm
[QUOTE][i]Originally posted by dwx [/i]
[B]That sucks. Can you use a fuel pump similar to the STI one with the extra chamber?
Phil [/B][/QUOTE] A quick search for fuel starvation will bring up a wealth of info.
SpeedyHAM: The L tank is different than the larger tanks. It's shape lends itself to not starving as much. I can run down below 1/8th on my 96L due to the shape of the tank. The fuel line routing has alot to do with this too....
Jay Storm
| 2cam16 | 06-16-2004 11:14 PM |
Good to know that our car doesn't starve that much. :banana:
| HighLife | 06-17-2004 02:43 AM |
I was always told that you should never run the fuel level low enough to get fuel starvation!? Most guys I race with wont run with the tank under half full for engine safety sake.
WOT + sudden drop in fuel pressure = leanout & melted pistons
I have heard of a few guys here in Australia that have killed engines due to a lean out caused by cornering under high G's - the fuel surges in the tank causing it to suck air for a split second.
WOT + sudden drop in fuel pressure = leanout & melted pistons
I have heard of a few guys here in Australia that have killed engines due to a lean out caused by cornering under high G's - the fuel surges in the tank causing it to suck air for a split second.
| sil0nt | 06-17-2004 03:33 PM |
i've run it very low before.. starting with 1/8 or below.. but i usually try to keep about 1/4 in there so i can go get lunch during the off heats and not worry about finding the closest gas station when im done.
| mykrrrr | 06-18-2004 08:04 AM |
I'm w/Brian. The lower the better but not enough to have to worry about getting petrol during the day.
Tom - Some "ballast" is worth the Xtra weight. :p
-mykr.
Tom - Some "ballast" is worth the Xtra weight. :p
-mykr.
| Zuffy | 06-18-2004 11:33 AM |
I'd like to see the design of the WRX fuel tank, and fuel pump and pick-up location just to see why it works so well. Anyone know of any pictures or diagrams?
| Patrick L | 06-18-2004 04:36 PM |
You guys in your WRX's got it easy. I have to run at least 3/4 tank in my RS. Heck I fuel starved with that much on the right hander in front of T&S on the south course at Nats last year. :mad:
| Slatt | 06-19-2004 01:31 AM |
[QUOTE][i]Originally posted by Zuffy [/i]
[B]I'd like to see the design of the WRX fuel tank, and fuel pump and pick-up location just to see why it works so well. Anyone know of any pictures or diagrams? [/B][/QUOTE]
I'd love to post something from the Service Manuals but I'm deeply paranoid about posting up copyrighted information...
Either way, EVERYBODY should own a copy of the Service Manual, downloadable from [URL=http://techinfo.subaru.com/html/index.jsp]here[/URL] for $20.
Looking at the description, I see that fuel is transferred from the left side of the tank to the right side (where the fuel pickup is) by fuel returning from the front of the car (venturi effect). If the venturi is clogged then the 'left-to-right-pump' is bypassed. Considering that, if anybody is having fuel starvation problems maybe they should dump in a bottle or two of that fuel injector cleaner stuff to free up the venturi?
Edit: OK, here's another interesting (to me) thought. Folks who have modded their car to the point where they have significantly increased fuel usage but have not had to upgrade the fuel pump might not have much fuel returning to the tank, which means very little pumping action from the left to right sections of the tank...
[B]I'd like to see the design of the WRX fuel tank, and fuel pump and pick-up location just to see why it works so well. Anyone know of any pictures or diagrams? [/B][/QUOTE]
I'd love to post something from the Service Manuals but I'm deeply paranoid about posting up copyrighted information...
Either way, EVERYBODY should own a copy of the Service Manual, downloadable from [URL=http://techinfo.subaru.com/html/index.jsp]here[/URL] for $20.
Looking at the description, I see that fuel is transferred from the left side of the tank to the right side (where the fuel pickup is) by fuel returning from the front of the car (venturi effect). If the venturi is clogged then the 'left-to-right-pump' is bypassed. Considering that, if anybody is having fuel starvation problems maybe they should dump in a bottle or two of that fuel injector cleaner stuff to free up the venturi?
Edit: OK, here's another interesting (to me) thought. Folks who have modded their car to the point where they have significantly increased fuel usage but have not had to upgrade the fuel pump might not have much fuel returning to the tank, which means very little pumping action from the left to right sections of the tank...
| Burnout | 06-20-2004 11:34 PM |
02RS i have to have at least 3/4 of a tank or i will get starvation. I thought the new tank went over to the RS's to but i guess not.
| ChrisDP | 06-21-2004 12:36 AM |
02 WRX, found that once the fuel light came on and we had 4 runs left between the two of us... after 2 of them, I got BIG fuel starve on the 3rd. Every left hander, the car turned off... NOT cool. Oh well, now I know where the limit is
| buster | 06-21-2004 11:16 PM |
02 WRX, and I get hesitation as I close in to 1/2 a tank, from full to 2/3 it is fine, after that...not so much. Dealer tried dumping some cleaner into the tank to clean the valve or sock or whatever.....didn't work.
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