Injectors and Fuel Pumps

[spyderturbo007]

What number are you using as SG? Also, what equation are you using?
Thanks

Nothing complicated. Just using the flow of all 4 injectors per minute. Converting that to lbs of fuel and multiplying by the target AFR of 11:1.

For SG, I'm using 0.76.

 

[DSMunknown]

Dark_Horse has already mentioned specific gravity, but I would like to make the reference more apparent for anyone who doesn't know what SG means.



SG = Specific Gravity

As a note, specific gravity is also abbreviated as SP GR.



As some of you may have noticed, I love to give links, so here you go:

• http://en.wikipedia.org/wiki/Specific_gravity
• http://geology.csupomona.edu/alert/mineral/gravity.htm
• http://jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry7.html
• http://www.infoplease.com/ce6/sci/A0846208.html
• http://www.essex1.com/people/speer/density.html
• http://www.ilpi.com/msds/ref/density.html
• http://www.galleries.com/minerals/density.htm
• A conversion list
• A second conversion list
• A third conversion list
• A fourth conversion list
• A place you can buy SG meters
• http://www.engineeringtoolbox.com/density-specific-weight-gravity-d_290.html
• Another conversion list
• http://www.answers.com/topic/relative-density
• http://www.answers.com/topic/specific-gravity
• http://epsc.wustl.edu/admin/resources/meteorites/meteorwrongs/density.htm
• http://searchsmb.techtarget.com/sDefinition/0,,sid44_gci538340,00.html
• Another conversion list
• Another conversion list
• Another conversion list
• This conversion page allows you to add in your own variables and numbers
• This is another conversion calculator page
• Another conversion list
• This page discusses octane ratings and such
• Another conversion list
• An interesting read about comparing fuel
• This seems like a good book to buy if you're really interested in the technical workings of science and how it relates to automotive know-how
• Yet another interesting conversion list

 

[DSMunknown]

Oh Naaaate.........Guess whaaaat..........I've got another one for youuuu.........






Denso US Lancer Evolution IX OEM pump.




I have recently learned that the Evo9 pumps flows slightly more than the Evo8. A nice tidbit of good news. And yes, the Evo9 pump is a direct replacement, just like the Evo8 pump is.

 

[UofACATS]

/\ Ah, nice. Thank you, a nice tidbit it is.

 

[DSMunknown]

Well, I was hoping I would be the first to test out the flow capabilities of the Evo 9 and 10 OEM pumps, but I'm a little slow on the trigger. Oh well. Maybe I'll test them out of spite. AMS beat me to the punch.

The first link tests the Evo 8, 9, and 10 pumps. The second link adds the Walbro 255 HP into the equation. Many have been waiting to see the capabilities of the Evo pumps, so here they are.


http://img517.imageshack.us/img517/9317/fuelpumptest1xt6.jpg
http://img98.imageshack.us/img98/8431/fuelpumptest2vh5.jpg


I have recently bought an Evo X pump. I have no idea if it will be a direct bolt on for the DSMs, but I should know relatively shortly. The only reason for me to test them myself is to see them at certain voltages. Both graphs neither indicate what the pumps were tested at.

 

[Kevin Jewer]

Those tests were done at 14v (top of charts), on a nice high current power supply IIRC.

 

[DSMunknown]

I must be blind.

 

[the_mork]

I think it would be nice to see the Bosch 044 included in this list either on its own or as a dual setup with a common pump, and perhaps a few different combinations if it isn't too much trouble.

 

[MMS40]

<snip>

i dont understand when it comes to the fuel,
im new to all this and will havbe to tune in a few months when i upgrade my fuel system,
does any one know of like fuel 101 ,
i dont understand some of these meanigs, i need to understand to find my goals and what i want

 

[the_mork]

I think you need to clarify your question, I'm not sure what you're asking.

Are you asking why the fuel flow from the pumps goes down with pressure?

Our cars use a rising rate fuel pressure regulator, the intention is that because the intake is pressurized there is force against the injectors which reduces their flow and the higher that force the greater the fuel pressure that is required in order to get the correct amount of fuel into the engine. As the pressure required increases the fuel pump needs to work harder in order to get the fuel to the required pressure so flow drops off.

If you have a question please be specific. It doesn't matter if you have a thousand little questions because most of us will be happy to answer them as long as you're willing to do some reading, as long as we know what you're asking we can give you the answers and little questions will probably help you to build a foundation for understanding the concepts that you are looking for.

 

[LandoAWD]

MMS, speak English. Thanks.