I have a walbro fuel pump, an aem fpr with stock sized fuel lines. 850cc primary and 1600 2ndary. Is that enough to support a gt35r boosting around 12psi? I am not sure on a/r I will choose yet.

The only reason I am asking is because BNR is taking their sweet time and my buddy has an extra turbo he said he is willing to give me, I need to buy the exhaust housing and do the manifold and plumbing. It's just a thought that crossed my mind, so I was curious in case I tell Bryan that I decided to change my mind. Origionally I didn't want that big of a turbo, but I am really considering it now.

I only want around 300whp, but now I am thinking the gt35r would probably give me a better spool and powerband over a bnr stage 3.

So now I am looking at 8-900 for a bnr that bolts up , or spending 1600-2000 and tons of time to do a full on single turbo upgrade

 

On the injectors thats enough fuel for 500+ hp, the fuel pump is another story, I wouldn't push that walbro past 375 hp

 

And you might wanna say what walbro, 255, 400, 450, they have a few different ones and it'll make a huge difference

 

injectors u got more than enough but that whinebro if its the hp 255 may not hold up and more so I hope u upgraded ur wiring to the fuel pump as well and it goes directly to the battery.

I learnt my lesson one cracked front plate later

 

Thanks guys, it is the 255. I'll take that into consideration

 

BTW, what is the diference of wiring the fuel pump straight to the batt vs the factory wiring?

 

Straight to the battery is pretty scary terminology.

But what he is talking about is you need to be sure your fuel pump circuit is capable of handling the increased current of a bigger fuel pump.

If you try to use your stock wiring with a bigger pump the increased current demand will create a voltage drop that will reduce the performance of the pump. If you look you should be able to find a chart online for most pumps that show their flow capability at certain pressures and voltages. Typically we would look at the supply at a nominal voltage such as 13V. And the pump can deliver "enough fuel".
BUT, if you have a 3V drop on the pump circuit you can see on the chart that the fuel supply is less than adequate. Next thing you know you've roasted an engine, all because the wiring to the fuel pump is inadequate. The way to avoid this is to run a sufficiently sized wire from the battery (fused of course) to the back of the car where you wire up a relay that is triggered by the old fuel pump wire and then supply the fuel pump from that relay.

There are of course variations to this, but the basic idea is to insure that the circuit can deliver all the power the pump needs.

 

Plenty of fuel but I strongly suggest ditching the old-style injectors and going with Bosch EV14s. Much easier to tune, much better fuel atomization. And crank that boost!