xr4tic

If they are rated at 43.5 psi (most are) then they actually flow 277 cc/m at 4 bar (0psi of boost) and 315 cc/m at 17psi of boost.

Anyone know?

Mike O.

This is for the 1.8T only.
1997-2000 240cc injectors (mine flowed at 235cc but that's another issue)
2001 270cc injectors

The 1.8T uses a high impedance injector (14.5ohms). ALL injector flow figures are rated at the industry standard of 43psi=3bar. This means that RC injectors and Bosch injectors and Mitsu injectors are rated for static flow at 43psi.

Audi's setup on the 1.8T is different in several ways. Although VAG uses 240cc or 270cc injectors, their static flow is actually higher at 0psi of boost because there is 58psi of fuel pressure in the system at that intake pressure. Therefore, the 240cc injector flows 34% more (darn close) and produces 322cc.

Things get interesting with the FPR that VAG uses too. This FPR regulates to 58psi (4bar) at 0psi of boost but reaches a whopping 90psi at 12.5 lbs of boost. Everything above 12.5 lbs of boost is at 90psi of rail pressure. This gets a little wierd to calculate but the effective fuel pressure actually decreases as one gets above 12.5 lbs of boost. For example, at 18psi of boost the effective FP is only 84.5psi [90psi-(18-12.5)]. It doesn't seem like much of a difference but it totals to 7%.

The next upgrade in injector sizing is 310cc. Your best bet is to score some Ford Motorsports 30lb injectors (they are high impedance and CHEAP on Ebay).

Why are you asking this question. If you are trying to use an online HP calculator, don't bother. It won't even be close with the setup that VAG uses.

Mike O.

CMH

BTW I thought you were doing a new turbo on your car.

xr4tic

The amount of water to be injected should be 10%-15% of total fuel injected.

The RC Eng site says to get the fuel flow at higher pressures, its:
flow at old pressure times square root of (new press divided by old press)

So how do you get 322 at 58 psi? Did you forget the square root? I get 278cc/m at 58psi.

So, if I start injecting water at 8 psi, then fuel pressure should be:
58+(8*2.5)=73psi
and flow = 312cc/m

so I need anywhere between 125-185cc/m of water.

Thanks,

Mike O.

is sitting in the basement.

With 135,000 miles, another timing belt is only 15,000 miles away.

The plan is this. At 150,000, I'm going to yank the head and swap it with a lower mileage one (might get the new one extrude honed or at least gasket matched and spend a little time manually cleaning up any obvious rough edges). This is when the new timing belt and T3/T04E are going in.

I really wish I had more time for this, but the economy is really hurting my business (so I have to work more) and I have a 7 month old at home to boot (he's a blast so the car takes a back seat sometimes).

I am thinking it will be done by Christmas. I literally have everything sitting in the basement right now and just don't have the time (bummer).

Mike O.

Mike O.

Ahhhh, you are correct grasshopper (about the square root) ---- my bad

CMH

We also plan on doing some work to the head and maybe bigger valves, a larger intake manifold and changing the tranny since it will only hold up to 380 hp. We plan on going above that.

xr4tic

I'm thinking about going the same route. The ATP manifold looks like it might work well.

Mike O.

ATP is in the basement. I got all the oil & water lines from them too.

scotty_passat

MikeO:

Do you have some test data that you used to determine the FPR behavior? Which model/year are you describing?

-Scott