nytro fuel pump

[tjc]

so in research it appears that the MCX 240 kit uses the stock pump with extra injectors. That being said is it possible to increase the injector size on the stock pump and get more than 6 pounds of boost on the stock fuel pump?

Of course you would need to pull fuel down low but could someone use the pump for say 10-12 pounds boost with properly sized injectors? It almost seems like the issues at this boost level (below 10-12) would be the fuel pressure not so much volume but maybe I am way off?

 

[SylvanLaker]

no not the right way about it. get the pump. you need pressure and flow...

 

[M5-]

so in research it appears that the MCX 240 kit uses the stock pump with extra injectors. That being said is it possible to increase the injector size on the stock pump and get more than 6 pounds of boost on the stock fuel pump?

Of course you would need to pull fuel down low but could someone use the pump for say 10-12 pounds boost with properly sized injectors? It almost seems like the issues at this boost level (below 10-12) would be the fuel pressure not so much volume but maybe I am way off?

Not sure if I am understanding your question but the stock pump using stock injectors can run up to about 15 lbs of boost which is what the 240 kit does. The 270 kit needs more fuel hence the external pump.

M5

 

[tjc]

well what I have is a turbo set up that I built, I have about 800 trouble free trail miles on this set up and I find myself looking for a bit more. I run it at sea level and I am looking at adding a head shim and upgrading the fuel controller to run around 8-12 on pump fuel. Right now I have a piggy back controller and all stock fuel system. I am looking at my options and setting my self up for upgrading in the future. My budget requires me to upgrade in steps.

My thought was if I could add a PCV and larger injectors and get away with that with the shim and a new intercooler I could upgrade the fuel pump and regulator when I decide I want to go higher in boost.

Everyone tells me that the stock pump and injectors are good for 6-7 pounds of boost at my elevation. I was curious if it is the pump that is insufficient or if increasing the injector size would work to add a little more fuel. My thought process is that if the MCX kit can run secondary injectors off the stock pump to 12 pounds why cant I increase the injectors and accomplish the same thing (or close to it). Maybe it is just that the stock pump wont go up in pressure thus limiting the stock injectors.

I know boost-it or something like that is a good option but I dont see my self needing more that 8-12 pounds (until I get sick of it I guess). I dont even think I have $1,500 into my whole turbo set up right now.

Does my theory make sense or does it not work that way?

 

[djones000buck]

You're on the right track. Larger injectors 450 or 550 cc's (330's are stock) would give you additional capability but you should have the ecu reprogrammed to take full advantage of the larger injectors and allow the system to function correctly.

 

[SylvanLaker]

it will run cleaner with the pump and properly sized injectors. Lower pressure and bigger injectors = less performance. those pumps are only $150.. I've seen a few guys go this route and it doesn't work very good.

 

[tjc]

I see what you are saying as far as $$ goes but I guess I am just trying to draw the line somewhere but I dont want to skimp either.

Another view is reliability/ease to maintain. To me adding larger injectors seemed simpler than a new pump and a regulator. Less things to possibly fail since Im not looking to push big boost numbers.