Need advice on fuel pressure

[92Talon251]

I am running a big 16g turbo on the stock fuel system, (stock pump as well) I have a busher FPR as well. My question is if I run 15 psi do I need to up the fuel pressure to keep the car from running lean? If so what pressure is advised and why?

 

[daren_p]

Do you have a logger? Thats the only way to really know whats going on & making sure your not hurting anything. Did you atleast rewire the fuel pump? When I ran my evoIII on the stock fuel system just rewired pump @ 15 psi I saw up to 107% injector duty cycle, I was safe as I was running dsmlink at the time to keep track of things. You will probably want to bump your fp up a couple psi, but you need a logger to know for sure.

 

[92Talon251]

Yes I do have a logger, no the fuel pump as not been rewired. I use a MMCD logger but I cannot find the Injector duty cycle menu. Would that menu be labeled IDC? Right now I have the car set at 40psi fuel pressure running 14 psi. I rarely race, so my car rarely sees 14 psi consistantly.

 

[daren_p]

You should defently rewire the fuel pump, its cheep to do and will give you the extra fuel when you need it most. With a rewire you'll see a couple more volts, which makes a huge difference on pump flow, around 14 volts compared to 11 or 12 with factory wiring. Im not farmilliar with the 1g loggers so I don't know if you are able to read injector duty cycle, but I believe you can log knock? If so do a wot pull and look for knock, indicationg that you may be running lean. Is that 40 psi with tha vac hose on or disconnected?

 

[TSIfreek]

40 psi with the hose disconected and pluged for setting purpases. You really need a fuel pump and rewire go with the 255 since you have an AFPR.

 

[turbodsm18]

I say buy a Walbro 255 pump. Its better to spend the money now rather than paying for later with a disaster. Think about it.

 

[GeosTalon]

I would buy the pump and perform a rewire, you've already got the FPR. One of the sponsors has the 255 for less than $100.

You don't want to have your car go down over running lean.