Whats the limit on this basic fuel system?

[eLeSthree]

Originally Posted by Silver14

Is there a quantitative way to determine you need more fuel pump? Pressure drop?

In hptuners i think there is a way to log fuel pump pressure demand and actual fuel pump pressure. Along with normal rail fuel pressure. Ill check it out tonight.

[fif_gen_powa]

Originally Posted by eLeSthree

Can I push this setup to 850-900 on 93 octane?

Is the motor built?

[dreksnot]

Originally Posted by JANNETTYRACING

The fuel system is the foundation on which everything else is built, too much is never enough.

Not the other way around but it is a trend I see every day, Build the car first then worry about the fuel system after you run out of money LOL.

When I originally had FI added to the car, figured the dual-fuel and four-digit injectors would be enough.....


Running out of fuel = power limit (hitting the wall).


Go big, real big. Thought I over-engineered the original system. Enough is never enough. Listen to the man ^^^.

[mrimpala02]

Originally Posted by dreksnot

When I originally had FI added to the car, figured the dual-fuel and four-digit injectors would be enough.....


Running out of fuel = power limit (hitting the wall).


Go big, real big. Thought I over-engineered the original system. Enough is never enough. Listen to the man ^^^.

[Silver14]

Originally Posted by eLeSthree

In hptuners i think there is a way to log fuel pump pressure demand and actual fuel pump pressure. Along with normal rail fuel pressure. Ill check it out tonight.

Thanks! I'm sure others will also like to see data.

[fldrummer]

Originally Posted by eLeSthree

I currently have the usual stuff:
ZL1 pump
Modified fpcm
MSD BAP
90# Deatschwerks

At 700whp, my inj DC is 48%.

Can I push this setup to 850-900 on 93 octane?

It will still be a centri style unit.

I'm at 755 rwhp with that exact same setup, but I'm also running meth. I'm with Ted on this though. I wouldn't try pushing it any more just running pump gas.

[dreksnot]

Originally Posted by Silver14

Thanks! I'm sure others will also like to see data.

This is what it looks like with (red line is Injector Duty Cycle, light-blue line is Fuel Pressure). [moving from left to right was the increase in RPMs, and you can see where gear shifts occurred]

[Silver14]

Originally Posted by dreksnot

This is what it looks like with (red line is Injector Duty Cycle, light-blue line is Fuel Pressure). [moving from left to right was the increase in RPMs, and you can see where gear shifts occurred]

Awesome, thanks for sharing what an example of running out of pump actually looks like. Was there a corresponding drop in fuel pump voltage?

[dreksnot]

Originally Posted by Silver14

Awesome, thanks for sharing what an example of running out of pump actually looks like. Was there a corresponding drop in fuel pump voltage?

No drop in voltage. This was with a BAP and upping the voltage a bit when in boost. On a differing note, I have been able to lower the Injector Duty Cycle and keep the Fuel Pressure higher by making adjustments to the tune (proper airflow and fueling) - total voodoo science/art there.

[eLeSthree]

Originally Posted by dreksnot

This is what it looks like with (red line is Injector Duty Cycle, light-blue line is Fuel Pressure). [moving from left to right was the increase in RPMs, and you can see where gear shifts occurred]

Actually, if you haven't modified your stock SS FPCM, you will always demand 48psi at upper rpms.

Now if you have modified the SS fpcm, or have a ZL1 fpm, then you'd be commanding 58psi at all times.

I was referring to another HPT channel you can log. i forget which it is, but I thought is was Fuel Pump Duty Cycle. That should tell you if its working at 100% and not putting out the desired fuel pressure.

The short block is stock, btw.

[eLeSthree]

Originally Posted by jeff657756

lol wut

I understand the advantages of E85. It would cost me around $2000+ to upgrade my fuel system to support the flow I would need for E85. I never said I was going to attempt to make 850whp on this blower. If I were to upgrade to a larger blower, I would probably be pushing the stock shortblock beyond my comfort limits, before aggressively tuning it with E85.... But it seems, even on 93 my setup will fall short.

Originally Posted by Taylortoons

If you’re upgrading to twin pumps, might as well go e85 too. Especially since you are FI. You can expect hp gains up to 75 at the wheels. That’s a lot!

That is true, if I were upgrading my fuel system, might as well.

Originally Posted by Silver14

Is there a quantitative way to determine you need more fuel pump? Pressure drop?

If you log this channel, and it reports 100% Fuel pump DC, while your commanded Fuel pressure is dropping below requested, I think its safe to say, you are out of fuel pump.

[bct10985]

I dont know my hp but went 9.6@145mph on a zl1 pump, bap, modified fpcm and id850's. But also spraying a aem 1000cc meth nozzle. Fuel pressure doesn't drop through the 1/4 but injector duty cycle is getting up there.

[eLeSthree]

Originally Posted by bct10985

I dont know my hp but went 9.6@145mph on a zl1 pump, bap, modified fpcm and id850's. But also spraying a aem 1000cc meth nozzle. Fuel pressure doesn't drop through the 1/4 but injector duty cycle is getting up there.

not e85, right?

Edit: thats pretty freakin sweet btw.

[bct10985]

Originally Posted by eLeSthree

not e85, right?

Edit: thats pretty freakin sweet btw.

93