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Old May 3, 2019 | 02:30 PM
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Fuel Cell Discussion

Figured it's better to start a new thread.

Originally Posted by Balrok
I've been pondering the surge tank but I'd have to go all FIA cert'd so may as well do a cell at that point.
Originally Posted by ayoustin
I'll be going the bolt in cell route either STM (formerly Fathouse Fab) or FCS.

https://stmtuned.com/products/stm-ev...t-in-fuel-cell

https://dpraceparts.com/products/mit...sump-fuel-cell
Originally Posted by codgi
That 2.2 build listed anywhere?
Originally Posted by alpinaturbo
Austin, the stock-location Fuel Cel, what is the volume it holds?
It is 1" shorter, height wise, than OEM, wonder if two of those cels can equate to 1 oem tank volume?
Website does not contain volume info, which is ---really strange since its basic requirement.
Originally Posted by alpinaturbo
Found on STM Webpage: sorry to ask redundant questions, did not realize it was the same product.
Answer is 6 gallons.

I personally really dislike the typical race-fuelcel that is located in some race and rally evos, either in liu of spare wheel well, or between the rear strut-towers.

OEM low-down location is perfect centralized location to minimize impact of fuel-level change on handling, and also keeping weight low and centered.
Originally Posted by ayoustin
Agreed. I think stock location is the ideal spot to put a cell. Sheds weight and not having to seal with a scavenge line to pull from the other half of the stock tank makes things considerably easier as well.
Originally Posted by Dallas J
It would be nice to see it on the passenger side though.
Originally Posted by ayoustin
Wouldn't work with factory fill neck or fuel lines if that were the case. Keeping factory fill neck and level sensor are big pluses to me.
Originally Posted by Dallas J
Ahh, word. Forgot about the fill tube.
The issue I have with these small tanks is they're......too small lol. Only two ways I see it.

1. Install a trick surge tank setup to add 2-5 gallons
2. Install a proper fuel cell in the OEM location.
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Old May 3, 2019 | 02:38 PM
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Now ATL does make a bunch of OEM evo fuel cells rated to FT3 or 3.5 per rules. 72L is about 19 gallons which is PERFECT, and it would seem the neck is on the wrong side? but it's otherwise complete. Did one of ya'll get a price on this unit?

https://www.atlltd.com/industries/mo...loor-fuel-cell

But then if you scroll down a bit you find the Evo 7 cells:

https://www.atlltd.com/industries/mo...lar-fuel-cells

And those look pretty damn identical to the one they used in the Blue Demon evo build doesn't it?

Last edited by Balrok; May 3, 2019 at 03:46 PM.
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Old May 3, 2019 | 02:40 PM
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The whole well cell doesn't appeal much.



Buuuuuuttttt...

If you do it like Sierra Sierra then of course it's bomb lol. Speaking which having said "bomb" behind a metal bulkhead such as the rear seat is also good.



Nevermind the trick sway bar...lol

Last edited by Balrok; May 3, 2019 at 02:54 PM.
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Old May 4, 2019 | 01:31 PM
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That STM one looks nice. Wonder what the weight savings are.
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Old May 4, 2019 | 06:40 PM
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around 35 pounds

https://www.evolutionm.net/forums/ve...fuel-cell.html
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Old May 4, 2019 | 06:45 PM
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Wow, not a bad weight to $ ratio considering. I wonder if thats savings from just the tank itself or including the reduced fuel.

Last edited by V.8MR; May 4, 2019 at 06:51 PM.
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Old May 4, 2019 | 08:23 PM
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Originally Posted by asuarez
Read further into the thread. TLDR;

A) Stock tank and heat shield combined dont weigh 35 lbs

2) They based their estimate off full car weight change which includes fuel carried

III) Stock tank is pretty good at running low fuel without starving. Improving would likely require a bladder

Firth) Stock tank is about as ideal a location you can get if your class has a min weight and you're at it.

Still tho, Fathouse does make some pretty pimpy stuff.
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Old May 4, 2019 | 08:40 PM
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Originally Posted by Dallas J
Read further into the thread. TLDR;



III) Stock tank is pretty good at running low fuel without starving. Improving would likely require a bladder

Firth) Stock tank is about as ideal a location you can get if your class has a min weight and you're at it.

Still tho, Fathouse does make some pretty pimpy stuff.
Provided its not worse, and does shave some weight, it also now frees up a nice cavity in a great location to run any ballast you may need to.
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Old May 4, 2019 | 09:29 PM
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Originally Posted by V.8MR
Provided its not worse, and does shave some weight, it also now frees up a nice cavity in a great location to run any ballast you may need to.
For sure. Zack brought it up too that running a small tank lets you run enough fuel without as much fuel slosh which seems like a win for AX. My next round of stuff should shave about 70lbs from the front of the car which is putting me danger close to needing ballast even with the heavyAF 18x12 and 315s.
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Old May 5, 2019 | 08:00 AM
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Originally Posted by Dallas J
My next round of stuff should shave about 70lbs from the front of the car
Ummmm 70# from the front!? Do tell! Are you moving radiator to your trunk? And what else bc 70# is like a lot lol. Perhaps different thread and discussion before I derail this one but ahhh that is going to be awesome!
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Old May 10, 2019 | 08:43 AM
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^Ya drop it in your parts thread, cause that's impressive if you're not replacing core supports and such.

Got quotes back: Evo 8 rally cell = $9978, 2k for carbon cover
Evo 7 Curved cell = 6500, 2k for carbon cover
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Old May 10, 2019 | 09:09 AM
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Well I'm a tad late, yea the ATL cells are suuper pricey. It's not cheap to get stuff FIA cert'd. If you're doing races that last 30+ minutes the 6 gal stuff is drfinitely too small but for guys doing TT, time attack, AX etc. it's a great option IMO.

The biggest appeal to me with the STM/FCS cells is location, weight savings, keeping a useful level sensor, and not having to run a siphon line anymore so you can run a large fuel pump without siphon issues.

I wanted to get one this winter but time and funding didn't permit. Maybe next year.
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Old May 10, 2019 | 02:26 PM
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you can fix most of the slosh issues on the original tank and get rid of the syphon by running a second pump in the passenger side of the tank instead of just the pickup... I made just such system.. stock level sensors and all..
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