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Old 02-25-2010, 12:17 AM   #1
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Default Fuel Cells? ( as in gas tank not tuning)

Anybody put one in? If so, what size and where? Did you mount it where the stock tank was? Any fitment issues? Was it heavier or lighter than the stock tank?
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Old 02-25-2010, 09:27 AM   #2
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This is what I plan to use... Based on the conversations with EPMiata it seems like a nice setup. When I install it will be going in the trunk. FSA ED108 Fuel Safe Enduro-Style Fuel Cell, 8 Gallon from the EPMiata.Com Online Store!

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Old 02-25-2010, 10:33 AM   #3
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Why do you feel the need to get a fuel cell? The stock tank is factory tested, is probably safer then a fuel cell, and the location is actually pretty damn good for weight distro. Cross weights are hardly altered at all between empty, and full tanks.
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Old 02-26-2010, 11:03 AM   #4
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Quote:
Originally Posted by Carthusiast View Post
Why do you feel the need to get a fuel cell? The stock tank is factory tested, is probably safer then a fuel cell, and the location is actually pretty damn good for weight distro. Cross weights are hardly altered at all between empty, and full tanks.
+1 if the spec miata guys dont run a fuel cell why would a miata need one
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Old 02-26-2010, 11:09 AM   #5
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My thought was weight and the location of the weight in addition to the added safety.

Anything mounted on the center line of the car is not going to change the cross weights much, but location fore and aft can effect how much or the weight is over the rear wheels.

For now, I am looking at it based on autocross rules/allowances. My car isn't getting caged/track time until next year, but I expect to hit the wall slightly faster than the spec miata guys do as well.
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Old 02-26-2010, 11:11 AM   #6
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well dont crash hahah. Well I guess if your setup calls for it then I am sorry for the input.
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Old 02-26-2010, 11:24 AM   #7
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No big deal.

I just thought that the track prep section would be the logical place to ask if anyone was running a fuel cell and what their experiences were.
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Old 02-26-2010, 11:37 AM   #8
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Chris, MNBiker (Steve) on the other board runs a fuel cell. I think it's a small one, and I think it's in the trunk. The factory tank's location is better than the trunk for MOI. Thagr81, does EPMiata's setup allow for the use of the sheet metal covers? I wouldn't want to run with the fuel sitting there with me like shown in the photo.

Chris, that car isn't going to be caged for the track. I won't allow it.
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Old 02-26-2010, 11:39 AM   #9
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Quote:
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Chris, that car isn't going to be caged for the track. I won't allow it.
All right you win, at least until after Nationals this year. Then all bets are off...
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Old 02-26-2010, 12:06 PM   #10
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Removing the stock tank leaves plenty of room for other options in its place
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Like maybe a custom fuel cell
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Or maybe even an aftermarket one. I haven't decided yet how much fuel I think I need for a 20 minute track session. I am thinking if I get 6 mph and average 100 mph that I run out with 5 gallons. So I am thinking either an 8 or 12 depending on dimension and weight. A one foot cube contains 7.4 gallons, so take some away for the bladder and foam and I could still get by with a pretty small package.

Has anyone on here run one?
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Old 02-26-2010, 12:10 PM   #11
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Quote:
Originally Posted by webby459 View Post
Thagr81, does EPMiata's setup allow for the use of the sheet metal covers? I wouldn't want to run with the fuel sitting there with me like shown in the photo.
It is my understanding that it is in the trunk based on their description. But it does appear that there is a cover made for it as can be seen on their car. However, it appears to be custom.

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Old 02-26-2010, 02:33 PM   #12
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My math might be off, but a 1 ft^3 tank would hold ~5.6 gallons of gasoline (S.D. of gasoline is 0.71-0.77, I used 0.75).

If you're using 6 mpg and 100 mph for your calculations, then that would let you run for just about 20 minutes on the nose (0.336 hours). The colder it is, the more it would hold.
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Old 02-26-2010, 02:46 PM   #13
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I don't need no stinking math, I used google

I figured some of the fuel would be used in warmup/ and waiting in grid. But its really close.
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Old 02-26-2010, 02:46 PM   #14
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Why would you get rid of a factory tested fuel tank, just to replace it with an aftermarket fuel cell in the same location? If you feel the need to upgrade to a fuel cell, copy those nationally competitive EP cars and put it in the passenger seat area.
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Old 02-26-2010, 03:40 PM   #15
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I doubt seriously that the stock tank is safer than a fuel cell. The racing fuel cells have bladder construction so even if the case is bent/cracked/ruptured it still does not leak.
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Old 02-26-2010, 03:55 PM   #16
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Quote:
Originally Posted by Carthusiast View Post
Why would you get rid of a factory tested fuel tank, just to replace it with an aftermarket fuel cell in the same location?
Well, my reason would be to avoid the fuel cut-off that occurs in a high lateral g corner with only an eighth of a tank left.
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Old 02-26-2010, 04:07 PM   #17
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It is my understanding that a wall must be between a fuel cell and a driver. You may have to check with the rules for your sanctioning body. That is why some put them in the trunk. Also, the bladder not only provides protection, but there is a foam that keeps the fuel from sloshing. Sloshing effects the handling of the car.

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Old 02-26-2010, 05:26 PM   #18
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Quote:
Originally Posted by Double O 86 View Post
Well, my reason would be to avoid the fuel cut-off that occurs in a high lateral g corner with only an eighth of a tank left.
Quoted for truth, stock tank, well pickup, sucks at this..

Fuelstavation due to g's may make you go kaboom.
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Old 02-26-2010, 05:48 PM   #19
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Is it that bad for you? I've come off track with seriously a quart of fuel left. (I drain the tank via a fuel test port in the fuel line after each session)
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Old 02-26-2010, 05:56 PM   #20
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Really depends on if you pick up air rather than fuel... But I say, why risk it?
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