LS1 and L76

Plums · #1 (**permalink**) 06-07-2007, 09:40 PM

Mike's right, around 300kW's at the wheels. Anything up to around 330kW's will be ok for aspirated engines, for forced induction it will be closer to 300 due to the required AFR.

These pump assy's are a good thing, I have a new VY unit to go in the Cobra. I also have a second hand VX unit for a good price if anyone is interested.....

Rebel1 · #2 (**permalink**) 06-07-2007, 10:10 PM

OK....so they're good for a 330fwkw engine...that's 440hp...thanks fellas.

Plums, so why are you using a pump assy from a VY...is it any better than the unit WASP suggested from a VZ ute?.

And what do you think of using a size larger fuel pipe from the tank bucket to the engine fuel rails?.

My thought was that it would be less restrictive and would provide a slightly larger volume of fuel at the same pressure. Obviously the engine rails consume what they want but there would be a slightly greater volume before it runs short.

Thanks again

Rebel1 · #3 (**permalink**) 06-07-2007, 10:25 PM

Mike, why would you want to run two walbro pumps?. Why not the Bosch 040 which is advertised as below? :

In tank 600hp fuel pump 040 model

This pump is a Bosch K-Jetronic pump which is capable of pumping efficiently at high fuel pressures and suits high boost , high flow applications. It has a built in strainer on the base of the pump and can usually be adapted to suit most in-tank applications. It is commonly called an Audi Motorsport pump by people in the trade. It has similar physical dimensions to the external Bosch motorsport pumps but is a little shorter.This unit is the In-Tank version of the Bosch 044 Motorsport Pump.

Aussie Mike · #4 (**permalink**) 06-07-2007, 10:33 PM

I've looked at them as well. That's definitely an alternative to the twin pump setup and probably easier to plumb in.

Cheers

Michael

400TT · #5 (**permalink**) 06-07-2007, 11:16 PM

We also used Bosch 044 in my brothers Harrison with turbo Lexus. Cheap and effective. But as Mike points out...noisy. Not a big problem depending on how noisy your exhaust is.

Plums · #6 (**permalink**) 06-08-2007, 01:13 AM

Rebel1, that's 330kW's at the wheels for an aspirated motor. I only ever quote figures at the wheels.

The std 3/8 lines that these things run are plenty big enough, particularly when there's 60psi of fuel pressure behind it. Realistically, you can easily run over 350 rwkW's with the std 3/8 lines (that's well over 400 kW's at the flywheel).
Be very careful about going to larger fuel lines unless you are running big pumps. The extra volume in the lines can actually reduce the efficiency and cause pressure drops, (not good). The extra volume of fuel weighs more and under heavy acceleration this extra weight, puts more load on the pump. It's a catch 22 really, because under heavy acceleration you require more fuel, but you are actually trying to force the fuel back down the lines due to your acceleration g loads.

With a std pump set-up, stick to the std size lines....

Rebel1 · #7 (**permalink**) 06-08-2007, 02:25 AM

Quote:

Originally Posted by Plums

Rebel1, that's 330kW's at the wheels for an aspirated motor. I only ever quote figures at the wheels.

The std 3/8 lines that these things run are plenty big enough, particularly when there's 60psi of fuel pressure behind it. Realistically, you can easily run over 350 rwkW's with the std 3/8 lines (that's well over 400 kW's at the flywheel).
Be very careful about going to larger fuel lines unless you are running big pumps. The extra volume in the lines can actually reduce the efficiency and cause pressure drops, (not good). The extra volume of fuel weighs more and under heavy acceleration this extra weight, puts more load on the pump. It's a catch 22 really, because under heavy acceleration you require more fuel, but you are actually trying to force the fuel back down the lines due to your acceleration g loads.

With a std pump set-up, stick to the std size lines....

Got ya Plums....standard pipes it is. Thanks heaps.