Now, before I start I have done a search and have read alot of the threads in this forum... but they all have to do with turbo engines... the NT section does not have any helpful info. So My question is:

I have recently installed a cold air intake and am now running leaner then I would like too. I am about to install a high flow fuel rail... Will this help bring me back to running a normal mixture again.

any ideas would be greatly apprciated?

ooops this may be helpful "I have a '94 plymouth laser 2.0L non-turbo"

Maybe your money would be better spent on an adjustable fuel pressure regulator, rather than a highflow rail. With the rail, you get what you paid for and that's that... it might be too much, or it might not be enough. At least with an AFPR you get to adjust the pressure in the rail yourself for a good mix.

...or even the B&M command-flo regulator which is dirt cheap in comparison to a fully adjustable one.

The difference is it's a restrictor so it's only able to increase fuel pressure, but that seems to be all you'd need.

I've also read somewhere that you can take a stock FPR and modify it to increase fuel pressure by a certain amount. This is done by lowering the amount of fuel returning to the tank.

I've got that too (AFPR)... but how much pressure is to much for a NT engine... and if that doesn't work then I guess I have to go with bigger injectors, but how BIG?

Well what's your base pressure and how much have you tried increasing it? And how are you monitoring your A:F?

Well I have the B&M FRP and Pressure gauge plus high flow fuel rail... but I was hoping to get them put on today....

but the factory is set at 47 - 50psi

No offence but with the high flow rail you are wasting your money. Essentially what you have is a small fuel pump, pushing fuel through small lines, through a restrictive fuel filter into a large fuel rail. The N/T's and Turbo's use the same rail and can flow enough to feed 660's with a PUMP that can push the required fuel.
I believe that the N/T's use 290cc injectors, I wonder what you would end up with if you got a hold of a set of the 390cc ingctors from an automatic 1st gen turbo.
Also what are you monitoring your af with, Autometer "blinky gauge", voltage output on the 02 or are you using a proper wideband O2 sensor.

Hello Ricardo.

What did you use to say that you are running "Leaner"??? (I presume an A/F Gauge).

I have a NT (in the process to get rid of the thing) and have done some mods to it.

I would like to ask you how old is your Fuel Filter??? The 1G NT Pump and Fuel Rail are pretty good and don't need replacing. Some are still running these components even after a Turbo conversion without any problems.

Maybe your Fuel Filter is causing a restriction. Try replacing it weith a New one (Stock should be fine) and do more test.

You can see a little on this old page of mine (page, not author...);
http://www.lks.net/~ghislisa/

Drop me a line if you have more questions.

Ghislain.

Well here's the deal... I never finished my fuel system upgrade yesterday (which includes changing the fuel filter), because I have to wait for 2 new o-rings for the injectors.... so after today I will find out if everything works out well... if not I do have 390cc injectors on hold, just in case I need the added fuel intake.

Just for arguement sake I am monitoring the A/F with the autometer gauge, but I can also feel the hesitation when I accelerate over 3000rpm... the idling is still O.k., but this morning I did stall while slowing down.

I'll keep everyone posted when I finish the fuel upgrade later today.

make sure the Fuel filter is fine

also the MAS is not damaged.

NT's are not that sensitive.

could be a bad 02 sensor more than anything

well i finally finished but discovered a leak in the banjo bolt connection area of my fuel filter to the fuel line. Either the copper washers that came with my new fuel filter are crap or the hooped transfer plug is damaged... I will replace both.. but for now my pressure is toast cause of the leak.. hopefully everything looks better tomorrow.

Why has the cold air intake caused you to run lean? Just because there is more air flow and the car is adding any more fuel in?