I'm running one of Hahn's Stage 2 kits on my 03 Cav, recently replaced my in-line fuel pump that was included in the turbo kit with a Walbro 225 in-tank fuel pump. The reason why I replaced it with a 225 from Walbro was because I asked the techs at Hahn what they would recommend for and in-tank to replace the in-line. Plus my in-line has one Canadian winter under its belt and countless kilometers.

My problem is that I bought a 225 from e-bay that came with an Intergra application kit. But that didn't matter because all I wanted was the pump and the harness.

But since I installed the pump I've been running really lean, basically the pump is only putting out 90 psi tops. Now, is there a hi-flow and a low-flow 225 ? and if there is, where do I get a hi-flow version of it ? ex: part numbers and suppliers. Basically I need a pump that will be able to put out at least 130 psi maximum. Because the kit requires a pressure of 90-95 psi at boost pressure.

Thanks guys
Evan

If you need more than 90 PSI of fuel then your injectors are way too small.





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Shifted wrote:If you need more than 90 PSI of fuel then your injectors are way too small.

My injectors are 330cc. If anything they are to big, but those are the ones that come with the stage 2 kit

Why do you think you need more fuel pressure then?





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Hahn Racecraft installation instructions for there Stage 2 kit:

For Stage 2 applications you should have 90-95 psi of fuel pressure reading on your fuel pressure gauge at full boost pressure. (9.5 - 10 psi)

You say you're running lean... how do you know?

Don't assume you are because your fuel pump isn't putting out the "recommended" pressure, this is where a wideband comes in handy. Like I said, if you have correctly sized injectors, you should not need more than 90 psi of fuel, period.





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I know I'm running lean because I put my fuel pressure gauge on my service port on the return side of my fuel rail and gave her full boost, and she only hit 60 psi. Plus my engine cuts sometimes when I give it full throttle.

Then I crimped my fuel return hose coming from the fuel rail with the pressure gauge installed to see what my pumps max pressure was. and all I got was 90ish PSI

and as far as me running a fuel pressure thats to high, I don't belive that, because the kits manual stated I need 90-95 PSI to run this kit, and I'm going to take Mr. Bill Hahn Jr's word on that.

I appreaciate your help man, really, thanks.
Evan

How did you make boost while watching the fuel gauge on the side of the fuel rail?

Fuel cutting during boost is also a sign of running too rich, or fouled plugs. Honestly I don't know that the stock fuel pump can supply any more than 90psi worth of fuel, and even aftermarket pumps aren't rated to do more than 110 or so.

Take my car for example...

With my 320's, full boost 5psi, 6:1 on the FMU and 32psi base pressure I was hitting 75psi tops fuel pressure at full boost, and I was pig rich (10.5:1). If you need more than 90 psi of fuel then you're injectors are too small, because all you are doing is burning out your fuel pump running it that hard. I can't believe (while I do believe you) that Hahn recommends you run your fuel pressure that high, you WILL burn out your pump. Larger injectors = lower fuel pressure...





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Shifted wrote:How did you make boost while watching the fuel gauge on the side of the fuel rail?

I have a gauge that is installed on the service port of my rigid return line with a ling extension so I can see the fuel pressure through my windshield.

I have a bunch of stuff to look at now, from what you tell me and what Hahn is telling me. So I'll have to get back to you on what happens.

TTYL
Evan

Ummm...

at 80% duty cycle and a slightly lean amount of fuel you're making about 218 whp there... that's at 95 PSI @ wot...

Do you feel you're making more? I would assume you are... hopefully at 10psi you're up at around 240 whp or so...

With that said... I can almost guarantee you those injectors are too small, and are being overworked.

Btw - 80% duty cycle is pretty high, so is 95 psi at the rail.

-Chris-



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