Injector Flow vs Pump Flow
03-19-2014, 09:37 AM
#34
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bringing up an old thread but i actually got sucked into the conversation and read the whole thing.
i understand the concept of the chart with injecters ect but i think there was something said about fuel flow being to much it could cause idle issues. im curious im planning on running a magnafuel 625 or 750 inline pump for 900 hp on e85. looking to do this soon.
with this being said would that cause problems or would i be better off running dual walbro 255 and have one running at idle and second come in at later time?
my winzip program also wont open the file but i have a piece of
computer so idk.
i understand the concept of the chart with injecters ect but i think there was something said about fuel flow being to much it could cause idle issues. im curious im planning on running a magnafuel 625 or 750 inline pump for 900 hp on e85. looking to do this soon.
with this being said would that cause problems or would i be better off running dual walbro 255 and have one running at idle and second come in at later time?
my winzip program also wont open the file but i have a piece of
computer so idk.
03-19-2014, 09:51 AM
#35
What error does it give you when you try to open it?
Too much fuel flow is really a regulator problem. The regulators only job is to hold pressure constant. If it cant you need to upgrade the regulator, or alternatively if you have 2 pumps is to have one off at idle. Injector pressure would be higher than expected so your fueling will be rich.
I do not recommend inline pumps since flow is always limited by the smallest pump. Seeing as how the 400s or 450s flow a ton more than the 255 I wouldnt bother buying a 255. Just put one pump on a hobbs switch and have a decent aftermarket regulator and you will be fine.
Too much fuel flow is really a regulator problem. The regulators only job is to hold pressure constant. If it cant you need to upgrade the regulator, or alternatively if you have 2 pumps is to have one off at idle. Injector pressure would be higher than expected so your fueling will be rich.
I do not recommend inline pumps since flow is always limited by the smallest pump. Seeing as how the 400s or 450s flow a ton more than the 255 I wouldnt bother buying a 255. Just put one pump on a hobbs switch and have a decent aftermarket regulator and you will be fine.
03-19-2014, 10:02 AM
#36
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error says. Cannot open file: it does not appear to be valid file.
well i have a fuel cell so im gravity fed into the pump. i have a aeromotive boost reference regulator which has never failed me.
but i know the 255 is not gonna cut it on my new setup so thats why i was looking at running two side by side into a Y fitting to rails, but i would rather do one big single pump because i dont really like the fact that one pump could fail or not turn on ect.
well i have a fuel cell so im gravity fed into the pump. i have a aeromotive boost reference regulator which has never failed me.
but i know the 255 is not gonna cut it on my new setup so thats why i was looking at running two side by side into a Y fitting to rails, but i would rather do one big single pump because i dont really like the fact that one pump could fail or not turn on ect.
03-19-2014, 11:02 AM
#37
A single pump could also be weak but still "work" so I think that argument is a weak one. Two smaller pumps seem to have a much better life than a single big one, from what I've seen.
I tried the file again on my work computer and it worked fine for me. I suggest updating your software or using a newer version of winzip.
I tried the file again on my work computer and it worked fine for me. I suggest updating your software or using a newer version of winzip.
04-28-2014, 01:48 PM
#39
I added some more pumps to the spreadsheet and also did some better math so using different fuels now accounts for the density difference between e85 and gas. This is important because pumps and injectors are constant volume devices whereas the power rating is only concerned with the mass of the fuel. So it should now be more accurate for E85 estimations for pump/injector sizing and power estimation.
Last edited by Atomic; 02-09-2015 at 03:28 PM.
