E85. When does the fuel pump have to be upgraded?
#2
Race Car
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My experience is it is good for around 350 maybe a liitle more true rwhp. Depending on your parts will determine whether it will be enough. Pressure is not the determining factor airflow is. Some make 400plus hp on 15psi.
#4
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It’s all ball bearings nowadays. Now you prepare that Fetzer valve with some 3-in-1 oil and some gauze pads. And I’m gonna need ’bout ten quarts of anti-freeze, preferably Prestone. No, no make that Quaker State.
#6
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Do the math.
Horsepower * BSFC = Fuel (lb/hr)
B.S.F.C for:
Normal Aspirated Engines is .45 - .5
Supercharged Engines is .55 - .60
Turbo charged Engines is .6 - .65
For 420 HP Crank (350 wheels)
420 * 0.6 = 252 lb/hr
convert to gallons per hour since most pumps are specified that way.
1 gallon gas = 6.3 lbs
(252 lb/hr) / (6.3 lbs/gallon) = 40 gallons/hour
So to get 350 RW HP you need to pump at 40 gallons/hour at the correct pressure (3bar in my case). With E85, you are past the capacity of a stock pump since you need +20% more fuel.
Horsepower * BSFC = Fuel (lb/hr)
B.S.F.C for:
Normal Aspirated Engines is .45 - .5
Supercharged Engines is .55 - .60
Turbo charged Engines is .6 - .65
For 420 HP Crank (350 wheels)
420 * 0.6 = 252 lb/hr
convert to gallons per hour since most pumps are specified that way.
1 gallon gas = 6.3 lbs
(252 lb/hr) / (6.3 lbs/gallon) = 40 gallons/hour
So to get 350 RW HP you need to pump at 40 gallons/hour at the correct pressure (3bar in my case). With E85, you are past the capacity of a stock pump since you need +20% more fuel.
Last edited by Bri Bro; 10-21-2011 at 11:06 AM.
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#8
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In my car the pump couldn't deliver for more than 20 psi boost on E85. So if you plan to run E85 to safely bump up the boost pressure you wont get far with out a better pump.
#9
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#11
Three Wheelin'
#12
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There are people that claim the wires get hot with for example the bosh 044 pump i have. I just did the wire mod with a relay connected to the old wires.
#13
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![](http://www.realstreetperformance.com/ebay/real_street_performance_fuel_pump_test_flow_chart.jpg)
http://realstreetperformance.com/sto...on-test-5.html
I've read quite a few people on this forum talk about hot wiring from an 044. Simple security measure. You don't want to have a large voltage drop to you fuel pump causing a lean situation.
#14
Three Wheelin'
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Huh, well I'll add that to the list of things to do. I forgot to take into effect the boost pressure that will increase fuel pressure (duh) so yeah, I can see how you could easily start pushing more amps than those tiny wires can handle. Especially on a track when you're constantly on the boost.
#15
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The pump running at 3 bar (44 psi) is pulling 8 amps. That is too much current for the factory wire going to the pump, the wire will not melt but you will see a voltage drop that will effect the performance of the pump. Increasing the voltage at the pump also increases the GPH rating so it is a good thing to do.
Last edited by Bri Bro; 10-21-2011 at 11:08 AM.