I think this goes in here since its a FI car. I wanted to know if it would be fine to not run vacuum to the FPR. Would it be ok to use the port only for positive pressure and not vacuum?

The regulator on the car is 1:1 Fuelab regulator.

Thanks.

 

some people tune cars with no vac reference on the fp reg.

i dont see whats goin on why you dont want vacuum to the top. and a am assuming you are talking about putting the port to something between the turbo and throttle plate?

 

boosted cars need fuel pressure raised 1 psi fuel pressure/1 psi of boost. all motor cars run fine on a constant pressure.

 

The reason there is a fuel pressure regulator with a vacuum port in the first place is to keep the pressure differential between the fuel rail and the intake manifold constant.

 

You are correct. Its a kseries boosted car with FPR mounted on the firewall. Just trying to see if it would be fine with out vacuum and just boost pressure.

 

you can do it, but you will have higher duty cycles. hook it to manifold vacuum. it is designed to fun that way. you dont need that much fuel when the engine is in vacuum.

 

Yea I ended up just hooking it to the manifold. Thank.

 

the idea of hooking it to vacum, would be to lower the pressure, where you dont need all the pressure, if you leave the pressure high in the vacum region, then you might run out of injector timing in the fuel map, where as if you let the FPR get a vacum/boost sig, it would allow for more tuning in the vacum section of the fuel map.

 

yes