Do I NEED an adjustable fuel pressure regulator when I install a Walbro 255 HP fuel pump? If I do, why wouldn't the oem regulator work?

I won't be boosting, just spraying... I wanted a quick answer so I posted it in this section.

 

Well installing the Walbro is going to raise your base FP up, so if it you want to bring it back down to normal then yes. OEM isnt adjustable.

 

Ok, thanks

 

Correct on both accounts.


I'll add that if the OEM FPR was kept in place, it would be in conflict with the AFPR, or should I say, it would make the AFPR useless and unable to function correctly. That's why the OEM FPR must be removed first when installing a AFPR.

 

what about vq35 that have the fpr in-tank?

 

Or drilled out and used as a fitting.

 

That's what I was thinking about doing when my afpr comes.

 

just wondering, hope you don't mind me asking in your thread 505max94se, is an afpr a must if you have the walbro fuel pump? would not having an afpr hurt a boosted car?

 

You dont "need" it, but its recommended if you want the car to operate as close to normal as possible. With the AFPR you can bring down the fuel pressure back to normal after installing the Walbro. You dont need it though.

 

Considering how much money we have dumped in our cars, I fail to see the point of drilling out a perfectly good OEM FPR and cutting corners when the adapter piece needed (which will flow properly guranteed w/o doubt) can be had for $15-$20. Either sell the OEM FPR or keep it for when you want to go back to stock, or when ready to do all the tuning through a piggyback ECU/controller. Just my .02

Also, FWIW, no AFPR here.......just big injectors. The rest is done via EU.

 

For the prices you can get a afpr less then $100 its pointless not to get one as you will better off in the long run tuning wise

 

i got a afpr on my car with the stock dek fpr and i was able to turn my fp down. i couldnt find where to buy the fittings that replace the fpr

 

Do you know where to get them for the vq35 fuel rail? (thats what your talking about, right?) Because I have an afpr inline with the stock piece on the end of the rail. I dont know if that makes a difference or not.

 

That shouldn't be possible.

We've discussed where to buy the fittings many times here on the org. Nothing came up in the search, eh?? Weird.

 

Chillin,

No, unfortunately I'm talking about the fitting for the VQ30 fuel rail. I've never searched, or ran across a fitting for the vq35; but I'm sure it's out there.

 

grr, they are hiding somewhere. thanks though.