WTF

im shootin for about 240whp on a ls motor would a stock evo8 pump support this with e85 or should i go for a walbro? already got the evo pump but just recently was considering e85... its plentifull here in mn

sikcrx89

i woudnt see why not.. i mean they produced the car when e85 was available so i see no problem with it.. as far as supporting the power i also see no problem with it as evo's have more power than your goal stock.

TorganFM

Although E85 is less efficient as far as mpg goes, and therefore amount supportable by the pump in that respect, it is so much more detonation resistant that it more than makes up for it. Go ahead, that pump on E85 is more than enough for 240.

fork

Not true the engine is an air pump that will devour a given amount of air but you need significantly more fuel to make the same power when switching to E85. Although I have no idea how much a stock evo pump puts out.

ps e85 rules

TorganFM

What exactly are you disagreeing with? You just pretty much said I was wrong, then repeated what I said.
"but you need significantly more fuel to make the same power when switching to E85"
Stock evo pumps from what I've seen are capable of like 300hp on stock wiring and pump gas. I was saying since E85 is so detonation resistant you could advance timing more on it, making more power, but at the same time stoich for E85 isn't 14.7:1 it's much lower, like 9.765:1. This means more fuel per power level, but timing can increase power even more. Yes advanced timing means more fuel consumption when using the O2 sensor, but what about if it's tuned into the map?

Inquisition

Advancing ignition timing does not mean more fuel consumption. Assuming you have a complete burn at 15*BTDC if you run 17*BTDC the burn isn't going to become more complete.

To answer the question, basically take what the limits of the pump is projected with regular old gasoline and divide it by 1.5 and thats how much power the same pump can support on E85.

aero

The Evo 8 pump flows very similarly to the Walbro 190.

Evo 8 pump:

Volts PSI Amps Ltr/Hr
12.5 43 10.8 159.62
12.5 58 11.9 119.24
12.5 73 12.9 63.09
14 43 12.1 201.89
14 58 13 157.73
14 73 14 112.93

Walbro 190:

Volts PSI Amps Ltr/Hr
12.5 43 6 168.45
12.5 58 7 145.11
12.5 73 8 88.96
14 43 6.5 208.83
14 58 7.5 162.78
14 73 9.5 104.10

http://www.roadraceengineering.com/f...pflowrates.htm

TorganFM

Interesting. When I advanced the timing on my B7 at the distributor I noticed better low-end and increased fuel consumption.

Inquisition

Well then you weren't getting a complete burn before hand and now you are.

Slo_crx1

Mainly because you are moving your powerband lower in the rpm range (for increased torque).