Fuel value resolution

[paulom]

Hello friends
I tune my car in Brazil with ethanol.
It uses 1300cc injectors and turbo.
In fuel value tables, I use numbers greater than 31000.
Is it possible to raise this range as the lines goes off the 2D graph ?
Or...is there a reason to 31000 be the max number ?

Thanks !!

[paulom]

Now I´m working on a ethanol turbo with 2200cc DW.
Using data given by DW ( injector opening time ), the numbers are over 60000 in fuel tables !

Any suggestion ? :)

[Hondata]

If you change the injector size then the fuel table values should not need to be increased, and there is plenty of range for any sized injector.

[paulom]

Thanks !

That´s a really strange thing.

With 2200cc injectors, the correct opening timing ( real low values ) , the numbers in table, even at idle are high.
At 13 psi 8000 rpm we got the max number 65535.

If I use 1300cc injectors, ( "double the opening time" ) numbers are about the half, and can go over 15 psi without getting that limit.

Both setups doesn´t use fuel return, but a 4.2 bar FPR and Ethanol.

I´ve seen that from 310cc injectors to 1300cc, the openning time raises. But for 2200cc, it gets the half of the values.

[VitViper]

I currently have a fuel value of 54000 with 2200cc injectors and E85 @ 30psi. I find that my return fuel system with dual pumps will max out before I hit the 65535 fuel value limit. Effectively I can increase the values 20% still.

I can see how you have a problem with no fuel return -- install a fuel return, problem solved.

[paulom]

Thanks Mr VitViper !

We´ll try something like take the FPR out of the tank, and install a boost-vac line to a new FPR .
Better if I could still leave it inside the tank.

If it´s not enough, we´ll make the complete fuel return line.



30 psi is something for a brave man ! Not me :)

[VitViper]

A fuel return for setups like this is highly recommended. Even with 4.2 bar pressure in the tank you are straining your fuel system as boost goes up and are trying to compensate for this with the fuel tables... With the fuel return you will get a 1:1 raise in pressure and your fuel tables will drop dramatically.

I'm pretty sure you know this...

As the software is currently set up, I'm fairly certain we will max out the fuel system on E85 even with dual fuel pumps well before we hit 65535 on the fuel values. From what I recall my fuel system was near the limit of the 2200cc injectors around 27-28psi...

Next round is higher efficiency turbo motor... 11.0 instead of 10.4 c/r and E85 ;)