Effects on running fuel pressure at 43.5psi....

[WHYTRYZ06]

Iv'e been playing with the voltage correction table. It Idles really well, but I am useing E-85 so I would flow more fuel than a gas motor. With my altitude I need 20% less fuel and the E-85 needs 30% more. I figure compared to sea level I use about 4% more. I am having other issues not related to the injectors so I may have made some unneccsary changes.

did u make a MAP for the voltage correction table?? if so, could you please post it,id like to see what you put for data, and also what PID's you logged to make the MAP work. im gonna run the racetronix 79# injectors too..i wanna be ready when I get em'

[eurospec1]

did u make a MAP for the voltage correction table?? if so, could you please post it,id like to see what you put for data, and also what PID's you logged to make the MAP work. im gonna run the racetronix 79# injectors too..i wanna be ready when I get em'

I guess i dont understand why you want to lower the fuel pressure, those injectors are not hard to tune at 58psi, is there another reason that is going over my head?

[eboggs_jkvl]

The only reason that I can think of is to run the pump at a cooler temperature and not kick it up with the BAP until you need the pressure?

I run at 52 PSI and when the Aeromotive pump controller sees 0 vac/0 boost it activates to the higher voltage and the PSI slaps to 58 and then rises 1 PSI of fuel pressure for every 1 PSI of boost. I end up at 72.5 PSI of fuel pressure at full boost.

I can't really see a reason to run at lower fuel pressure unless you are strapped for the pump being able to handle the full load or you are running small fuel lines?




Elmer

[joecar]

Some people run the lower pressure so they can better control their big injectors at idle...

the larger injectors are more prone to physical (mass/inertia) effects... they have a "minimum" on time.

[eurospec1]

Some people run the lower pressure so they can better control their big injectors at idle...

the larger injectors are more prone to physical (mass/inertia) effects... they have a "minimum" on time.

We did a 440TT c5 a few days ago with the 79# racetronix's injectors, just a base tune for idle so he could run it for a 30 minute break in period, it settled right into idle at 800RPM with a few tweaks of desired airflow and VE once we input the correct IFR table and accounted for the extra cylinder volume, it was really easier then i had expected it to be, although the RR plays a huge part in that.

I see the logic in your statement Joecar, im just assuming from my experience that this is not neccesary with the racetronix 79's

[WHYTRYZ06]

We did a 440TT c5 a few days ago with the 79# racetronix's injectors, just a base tune for idle so he could run it for a 30 minute break in period, it settled right into idle at 800RPM with a few tweaks of desired airflow and VE once we input the correct IFR table and accounted for the extra cylinder volume, it was really easier then i had expected it to be, although the RR plays a huge part in that.

I see the logic in your statement Joecar, im just assuming from my experience that this is not neccesary with the racetronix 79's

So what you are are saying is that they (79#ers) are easy to tune, w/ the correct IFR table??

[joecar]

Oh, the Racetronix 79'ers must be well behaved (high quality)... cool...

AJ/WHYTRYZ06, you should able able to calculate your IFR table using your measured rail pressure and you should be good to go.

[WHYTRYZ06]

Oh, the Racetronix 79'ers must be well behaved (high quality)... cool...

AJ/WHYTRYZ06, you should able able to calculate your IFR table using your measured rail pressure and you should be good to go.

Heck, I hope so...

[vatman02]

did u make a MAP for the voltage correction table?? if so, could you please post it,id like to see what you put for data, and also what PID's you logged to make the MAP work. im gonna run the racetronix 79# injectors too..i wanna be ready when I get em'

I can't seem to be able to post the map but it is DATA= XXX.BEN COLUMN=GM.VOLTS ROW=GM.MANVAC
These are what you will need to log as well.

[WHYTRYZ06]

I can't seem to be able to post the map but it is DATA= XXX.BEN COLUMN=GM.VOLTS ROW=GM.MANVAC
These are what you will need to log as well.

ok got it.