Fueling & Injection - F-Body fuel delivery system question
06-24-2004, 07:05 PM
Is there any Polyurethane or fiberglass-reinforced polyester in a stock F-Bodies fuel system?
Does anyone know of the materials used in the fuel system and if any of them are incompatible with ethanol?
I am asking because I am looking into converting my '98 Trans Am to use Ethanol (E85 in particular).
06-25-2004, 01:17 PM
06-25-2004, 02:52 PM
I was going to do this same thing. The onlt component I wasn't sure about was the gas tank. I would go with a race cell. I hope you have done this before, or someone who has is helping you. You will need at least 94 lb./hr injectors, and a mega sized pump.
06-25-2004, 04:54 PM
The websites I have visted and people I have talked told me to expect to use 8-15% more fuel if I am running E85.
I believe the 5.3 flex fuel motor used in the trucks uses a pump and injectors rated to flow 20% more fuel.
Supposedly some tank coatings do not hold up well. I could alway switch to a 99+ tank if I knew what kind of plastic they were made of.
06-25-2004, 04:54 PM
I'll be doing all of the work by myself.The information is what I need help with.
06-25-2004, 11:38 PM
To the best of my knowledge the Stoic fuel air mixture (or the fuel air ratio that most efficiently converts fuel to HP) for ethanol is around 7:1 verses 14.7:1 for gasoline - so that will require twice as much fuel ---- not 20% more as suggested.
And using it will require constant maintenance of the fuel system.
Periodic flushing etc.
The nice thing is that it is high octane (16:1 compression is possible) and you can run it up to 40% rich before you loose significant HP. So tuning is really easy
I ran a 400inch Alcohol Roundy-rund car several years ago - it made 800+ HP all night long.
06-28-2004, 04:10 PM
Ok, will there be a difference between straight alcohol and e85? I would assume there would be.
E85 is 85% alcohol and 15% Gasoline. Wouldn't this affect the stoich ratio and the amount of fuel needed? Maybe this is why the sites I was looking at say 20% more fuel is required.
I saw on the ethanol sites I visited that water is a real concern when running alcohol.
06-29-2004, 09:52 AM
I have no experience with E85. True, it would probably require a little less fuel, but why not just go with pure ethanol? I take it this will be a drag only car, correct? You will need twice the fuel, and almost double on the timing side. 800 to 900 all motor should be no problem with a stout alky setup.
06-29-2004, 03:57 PM
Actually this is a daily driver which will become an occasional driver . I am looking at getting into modifications (blower and nitrous. I run N20 only right now) that will require I run above 93 Octane on a regular basis.
104 unleaded is $5 per gallon around here and I can only get it at the local track. E85 at 103+ octane is $1.90 and available in a couple of spots.Even if I need twice as much fuel I'd come out ahead. Right?
What displacement are you talking about for 800-900 all motor? I am leaning toward an Iron 408 right now.
My tentative plans are for a magnacharger w/IC and a decent shot of spray (150-200). My goal is around 750 rwhp through a T400.
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