hello,

I have a 99 civic DX with the Greddy 19t kit at 8-10psi. I am running the RC 310cc injectors and am about to install a walbro 190lph and AEM FPR. I will be using Crome starting next week and chucking the Emanage. I'm pretty sure the pump is gonna bump up my pressure once I install it. My question is should I keep it around 45psi base pressure? Or should I bump it to about 60psi to get better atomization and keep the duty cycle lower? It's gonna be tuned at Church's as soon as I get my OBDI ecu.

thanks for the help!

 

I think you should be ok, asuming we are talking about a DX with a stock D series motor.

One thing to keep in mind is when you raise fuel pressure you are going to limit the amount of flow coming from the pump. I cant find a chart of a Walbro 190lph, but I do have one of a 255lph and 255lph high pressure. At 10 psi of boost and 60 psi of base pressure the most your fuel pressure you will see will be 70 psi. At 70 psi of pressure a regular 255lph will flow 30GPH(136LPH) not 56GPH(255LPH). If I figure the same amount of flow loss on a 190 pump then the flow will go from 42GPH(190LPH) down to 22GPH(100LPH), but that's just an educated guess. The good thing is your 310cc injectors will be able to flow a max of about 380cc's at 70 psi of fuel pressure and WOT. If my guess above is correct then pump which is flowing 100LPH or 1666cc/min will flow about 400-415cc's per injector.

 

stock pressure should be fine.

platinum.

 

wow thanks everybody.