What will dual 274 pumps handle on E85

[Autopart101]

Anyone know what supercharger WHP level x2 274 pumps can support on E-85. I'm making around 900WHP now at just over 16psi Boost. Looking to add a few more pounds of boost. Will the 274s fuel 1kWHP?

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[engineermike]

I could look at your log in detail and infer how much overhead you have left. Be sure to capture lift pressure and port injector pulsewidth. I’m assuming you already have a return style system with twin pumps “full on”(?).

 

[Autopart101]

I could look at your log in detail and infer how much overhead you have left. Be sure to capture lift pressure and port injector pulsewidth. I’m assuming you already have a return style system with twin pumps “full on”(?).

Tuner stated I have some head room left. Not sure what that means. I do have the Arcane full return style system. This has 1 regulator that deadheads into the stock Roush rails. Also FIC 1000s injectors.

 

[engineermike]

Can you see what your port injector pulsewidth is?

 

[Autopart101]

Can you see what your port injector pulsewidth is?

No. wont know till tomorrow. I emailed the tuner.

 

[Btfresse]

Also curious what WHP my setup will support. Gen 3 coyote, Whipple, FIC1000 injectors, Fore return system with dual 267 pumps on E85. Made 761hp on a 3.85inch pulley

Believe this is the data needed? First lift pump pressure listed is actual, desired below it. Injectorspulse width and duty percentage is on here as well

 

[engineermike]

For reasons we don’t understand, the gen3 won’t allow more than about 11.8 ms port pulsewidth at 7500 rpm even though 100% duty cycle should be 16 ms. That said, 7 ms is only using about 60% of what’s available. Assuming gdi is carrying half your fuel load, you have about 20% more fuel available overall. That said, I doubt your gdi system is being fully utilized so that could also give you some more capacity.

 

[Btfresse]

For reasons we don’t understand, the gen3 won’t allow more than about 11.8 ms port pulsewidth at 7500 rpm even though 100% duty cycle should be 16 ms. That said, 7 ms is only using about 60% of what’s available. Assuming gdi is carrying half your fuel load, you have about 20% more fuel available overall. That said, I doubt your gdi system is being fully utilized so that could also give you some more capacity.

Thanks for the reply. Any recommendations on which size smaller pulley to try and keep it relatively safe? Lol

Would like to capture another data log on a smaller pulley. The 3.85inch I have currently is giving me about 10-11psi on my mechanical boost gauge.

 

[HKusp]

I would think the 3.5 would be well within the safe range. What do you think engineermike?

 

[engineermike]

@Btfresse if the 20% overhead is accurate it means you could drop all the way to the 3.25, but I would sneak up on it and make sure the fuel pressure holds up.

That said, I’m running the 3.25 pulley with only a single dw400 pump and 55# injectors….

 

[Autopart101]

Can you see what your port injector pulsewidth is?

48 percent DC on PI.
68 PSI fuel

 

[cbrtrx]

Also curious what WHP my setup will support. Gen 3 coyote, Whipple, FIC1000 injectors, Fore return system with dual 267 pumps on E85. Made 761hp on a 3.85inch pulley

Believe this is the data needed? First lift pump pressure listed is actual, desired below it. Injectorspulse width and duty percentage is on here as well

267s have a blow off at 80 psi, factoring in higher boost levels and the pressure drop in the system it's fairly easy to get to 80 psi at the pump. They really shouldn't be used in these cars with moderate boost levels so keep that in mind. The 274 has a much higher blow off psi.

 

[Autopart101]

Can you see what your port injector pulsewidth is?

9.1 at 7000rpms. As dyno operator pulled up early making 885@7000.

 

[engineermike]

9.1 at 7000rpms. As dyno operator pulled up early making 885@7000.

The PCM won't allow more than about 11.8 at 7500, so you're getting close but there's still a little room.

 

[Autopart101]

The PCM won't allow more than about 11.8 at 7500, so you're getting close but there's still a little room.

Will it suport 100 more whp? If not. What would be needed? Injectors only? Triple pumps? 2 brushless pumps?

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