Help!!! with Walbro Fuel Pump

[Focus]

OK guys I need help on this one.

I just installed a new Walbro 255 in-tank pump. Now anything over 5000-5500 rpm and it starts going lean.

I have 4 extra injectors and I can play with the duty cycle from 10% all the way to 80%, and hardly any change.

My thoughts are either:

1. The stock FPR cannot handle the task.
-or-
2. The walbro may need anothe inline fuel pump to help it out.

Let me know what you guys think

 

[LinuxRacr]

The Walbro should NOT need any help.

 

[LinuxRacr]

Also, you say you are controlling the duty cycle directly? How are you doing it?

 

[Focus]

Also, you say you are controlling the duty cycle directly? How are you doing it?

The Injection map on the MPI. I think it's duty cycle that I am controlling. I may be wrong.

 

[LinuxRacr]

Right, by controling the injector open time. I was just trying to see if we had the same understanding about that. Ok. What boost are you running?

 

[Focus]

Right, by controling the injector open time. I was just trying to see if we had the same understanding about that. Ok. What boost are you running?

Regardless of what boost I set it to. I tried 12,15,17, and 18 psi. It only gets gradually worse.

 

[mp5jeff]

well yea raising the boost will make it worse, that's a given =)

 

[LinuxRacr]

well yea raising the boost will make it worse, that's a given =)

(mswerd) Do you have the Turbo Module hooked up?

 

[Focus]

(mswerd) Do you have the Turbo Module hooked up?

Turbo module is hooked up. Let me ask you this. At WOT over 5000 rpm, what value do you have on your injection map. I am suspecting that my value may be too low. I was thinking in terms of duty cycle, but you say it is on time. So probably my value of 65 is too low, hence the leaning out.

 

[LinuxRacr]

Yep, don't think in terms of duty cycle. The numbers don't directly relate to duty cycle. Your max number is 255, so you wouldn't have a duty cycle that high. You probably need to add more fuel. What does your analog out voltage read at that point on your map? If it isn't close to 5 volts, you still have fuel to add.

 

[Focus]

Yep, don't think in terms of duty cycle. The numbers don't directly relate to duty cycle. Your max number is 255, so you wouldn't have a duty cycle that high. You probably need to add more fuel. What does your analog out voltage read at that point on your map? If it isn't close to 5 volts, you still have fuel to add.

gonna go check, I will run the car and let you know in 10-15 minutes

 

[Focus]

Just went out on a test drive, I had the values up to 200 over 5000 rpm , no change. Air fuel hitting 15. That's why I suspect fuel pressure.

 

[RyanJayG]

I'd be willing to bet your fuel cal is way low, or your TM is kicking in at some rediculously high point

 

[Focus]

I'd be willing to bet your fuel cal is way low, or your TM is kicking in at some rediculously high point

My Fuel cal is at 0 and my TM is set to kick in at .62 The weird thing is that I can add fuel with the extra injectors at idle ( Timing of 30 will almost choke the engine, will give me A/F of 10 or less) but at WOT over 5000 rpm, I get nothing.

 

[funktownp5]

Make sure that u have the rubber gromet and the spacer installed or there

will not be enough fuel pressure, i was havin the same problem u are.

 

[Focus]

Make sure that u have the rubber gromet and the spacer installed or there

will not be enough fuel pressure, i was havin the same problem u are.


http://www.msprotege.com/forum/attachment.php?attachmentid=30872&stc=1

Gonna look in to this. Thanks

 

[Bigg Tim]

As long as you know for sure that the injectors are hooked up right, they should be firing as you increase the numbers. And like Linux said, the values are just that, values and not duty cycle.

The fuel cal shouldn't matter too much on the injection tab. Do you have all 1's in the 1x16 column of the injection tab? If not then you are not adding the fuel you think you are. How about a snap shot of it, so I can check it out. Here's one of mine, but I am only running 2 xtra injectors B4 the TB and 8psi.

What are you using to verify the A/F ratio?


edit....Woo hoo, post# 1,000

 

[Focus]

As long as you know for sure that the injectors are hooked up right, they should be firing as you increase the numbers. And like Linux said, the values are just that, values and not duty cycle.

The fuel cal shouldn't matter too much on the injection tab. Do you have all 1's in the 1x16 column of the injection tab? If not then you are not adding the fuel you think you are. How about a snap shot of it, so I can check it out. Here's one of mine, but I am only running 2 xtra injectors B4 the TB and 8psi.

What are you using to verify the A/F ratio?


edit....Woo hoo, post# 1,000

I have an Innovate LM-1 wideband.

Here is a screenshot of my Injection Map.

 

[LinuxRacr]

Your map is interesting...referring to your 1x16 Fuel AMP column. 1.20's? Tim, what do you think?

 

[Bigg Tim]

Yeah man, there's no way you should be lean. No sure about your fuel pressure issue. Nick is still using the stock pump on deans car and he is running 24psi wit 2 xtra injectors. Have you been running this setup for a while?

Don't know about the 1.20's. I have only ever used 1's and so has nick. You might want to try to make them 1's, but I don't think that would be it. It's worth a shot.

Can we get a map file to look over all the settings?