can a stock fuel pump cause u to run lean if ur running 450 injectors?

 

give a little bit more details about your setup.

Where are you running lean ? RPM, vaccum reading ( or boost ).

stock/aftermarket fuel pressure regulator ?

450 injectors, wired correctly ( need resistor box ? for your setup ).

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Hard to say, but if you are stock setup ( I dont see why you would have 450s )and everything else normal, you would run VERY RICH .

 

What makes you believe the engine is running lean? For example, a bad O2 sensor or exhaust leak could give a false reading.

 

Stock fuel pump will never push enough fuel to those 450s. Needs walbro in tank first.

 

give a little bit more details about your setup.
14b with crome chip(a friend did it)

Where are you running lean ? RPM, vaccum reading ( or boost ).
5k and boost
stock/aftermarket fuel pressure regulator ?
stock

450 injectors, wired correctly ( need resistor box ? for your setup ).
yes it is and it runs rich everywhere but there


WALBORO ON THE WAY!!

 

Your on the stock fuel pump? And are wondering why you are running lean?

 

It could be 2 things.

I would probably say that where you are running lean there is a dip in the injector MS to boost you are running.

this can be due to a few things:

-Was the chip tuned specifically for your setup ( aka your motor , turbo , IC,injector setup you currently have ? )

-But if you are boosted, I Would definitely upgrade the fuel pump.

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you also forgot to say what motor ?

d16y8, b16,b18b ?

I have seen a few lean spots with "generic"chips installed for boost setups in the vtec cross over.

 

No I was wondering if I can b lean with that set up.....but my walboro is coming....

Yes caz the guy has the exact same set up cept for the fuel pump.....I gotta d16Z6

 

If you are cloning chips from a buddy, try to get your setup as close to his as possible.

Ask him if he has a fuel pressure regulator, and if he does what psi he is running.

IF hes on oem FPR , then you are good.

 

sounds like u need a fuel pump, and a tune for your own set up. not your buddies.

Every engine acts differently.. so you will need to tune to your set up. Why you threw on 450cc's on a OE pump doesnt make sense. Sounds like you need a Fuel pressure regulator also. I would run @ 45psi and re-tune.

 

This. 350 is about max the stock fuel pump can handle, and that's maxing it out.

 

Oh ok thanks...walbro on the way already....well he's tuning mine...our difference is turbo set up 15g vs 14b and he has stock fuel pressure regulator