just wondering, my boss said something to me like, if you upgrade the fuel pump, you need a bigger fpr. he is a v8 guy who races circle track, so he has some knowledge. just wondering.

Brian

pretty sure that with a 4 bar fuel program it is needed and for a 3 bar it is not nesesary

you dont need a fpr for a bigger fuel pump. It will pump more gas than you need, but the fuel return lines will return the excess.

I have a question? I just did a T28 setup on my 97 SE-R I put in 370cc injectors and I also have the jwt program for the injectors. Now my car hasnt been tuned yet, and it seems to run really rich..When I am stopped my air fuel reads lean and then as soon as I go or really put my foot into it, it goes right to rich and stays there... I still havent put in my Warlboro 255hp is it a good idea to put it in or sell it.. The pump is still brand new.. I also have an afc controller that right now is just getting readings I havent hooked up the Mass air wire yet... Thats the wire to adjust everything with...

97 SE-R Turbo!!!!!:D

Originally posted by Joes97turboSE-R
I have a question? I just did a T28 setup on my 97 SE-R I put in 370cc injectors and I also have the jwt program for the injectors. Now my car hasnt been tuned yet, and it seems to run really rich..When I am stopped my air fuel reads lean and then as soon as I go or really put my foot into it, it goes right to rich and stays there... I still havent put in my Warlboro 255hp is it a good idea to put it in or sell it.. The pump is still brand new.. I also have an afc controller that right now is just getting readings I havent hooked up the Mass air wire yet... Thats the wire to adjust everything with...

97 SE-R Turbo!!!!!:D

I'm not sure about the program, I couldnt tell you because I dont have any experience with the fuel mapping of the JWT chips...
But as for the fuel pump, its definately a good idea to change it. You'll need it for higher boost, even at stock boost its still good insurance, one less thing to worry about, plus installation is real easy.

Hers some instuctions: http://www.sr20deforum.com/showthread.php?s=&threadid=18521&highlight=fuel+pump

Originally posted by civicdragon


I'm not sure about the program, I couldnt tell you because I dont have any experience with the fuel mapping of the JWT chips...
But as for the fuel pump, its definately a good idea to change it. You'll need it for higher boost, even at stock boost its still good insurance, one less thing to worry about, plus installation is real easy.

Hers some instuctions: http://www.sr20deforum.com/showthread.php?s=&threadid=18521&highlight=fuel+pump

This is true it can never hurt to have a big fuel pump. But it can hurt to have a big FPR and also cause drivability problems.

Originally posted by TUNED200
just wondering, my boss said something to me like, if you upgrade the fuel pump, you need a bigger fpr. he is a v8 guy who races circle track, so he has some knowledge. just wondering.

Brian

That is bad info don't listen to him you want to stay with the stock 3 BAR FPR.

Let me break it down.

You use an uprated FPR when your fuel injectors can't keep up with the demands of you needs. This is a bandaid.

You upgrade your FP and leave your FPR alone if you are smart PERIOD.

You keep the stock 3 Bar 43.5psi FPR because that is what are injectors are rated to flow at if you go 4 Bar or more you are forcing more fuel out of them which will shorten there life and the life of you FP.

So what about my car running so rich then????

rich according to what? your A/F guage, or rich according to a 6 wire O2 sensor?

the A/F guages you plug into your stocker O2 sensor are useless. if you want to find out if it is running rich, plug it into a 6 wire O2 sensor.

I would think that if the FPR can't drain the excess pressure from a high-flow FP, you'll end up with an uncontrolled (higher) fuel pressure fluctuation in the rails. The pressure has to go somewhere.

The stock FPR is pretty restrictive, so it is possible that a high pressure/flow pump will screw around with the pressure at the rails.

Get a fuel pressure gauge installed between the injectors and the regulator to see if this is the case.

Originally posted by dry
I would think that if the FPR can't drain the excess pressure from a high-flow FP, you'll end up with an uncontrolled (higher) fuel pressure fluctuation in the rails. The pressure has to go somewhere.

The stock FPR is pretty restrictive, so it is possible that a high pressure/flow pump will screw around with the pressure at the rails.

Get a fuel pressure gauge installed between the injectors and the regulator to see if this is the case.

1. Never mind.

2. What do you mean a stock FPR is restrictive thats what a FPR is suppost to do restrict the amount of fuel flow back to the tank.
Fuels not just going to jump out the injector without help.

3. A fuel pump supplys volume not pressure. Thats what the FPR is there for.

4. How a fuel pumps get rid of excess fuel. It has a thing called a relief valve that will open and bypass fuel to the inlet port to prevent excessive fuel pressure.

Originally posted by Joes97turboSE-R
So what about my car running so rich then????

Because you have JWT ECU. You could have got the same effect with a STOCK ECU for less $550.00.

Originally posted by charlie2020


1. Never mind.

2. What do you mean a stock FPR is restrictive thats what a FPR is suppost to do restrict the amount of fuel flow back to the tank.
Fuels not just going to jump out the injector without help.


Restrictive to a higher flowing pump. The stock FPR can only flow so much at a certain pressure.


3. A fuel pump supplys volume not pressure. Thats what the FPR is there for.

4. How a fuel pumps get rid of excess fuel. It has a thing called a relief valve that will open and bypass fuel to the inlet port to prevent excessive fuel pressure. [/QUOTE]


If the pump can deliver more fuel than the regulator can relieve to provide a consistent pressure to the rails, you're going to get erratic pressures as measured at the fuel rail. Erratic pressure at the rail means erratic fuel volumes being injected.

Yes a pump supplies volume, and if the FPR can't also flow enough volume, the pressure WILL build behind it i.e. in the fuel rail.

But coming to think of it, I don't think the stock FPR will be overpowered by a 255lph pump.

Originally posted by dry


Restrictive to a higher flowing pump. The stock FPR can only flow so much at a certain pressure.

Thinks about what you said above. The FPR does not flow fuel it regulates the flow. And as long as fuel pump don't flow pressure your OK. Member pumps flow volume. If your FPR went south there would be inadiquit pressure in the fuel rail.


3. A fuel pump supplys volume not pressure. Thats what the FPR is there for.

4. How a fuel pumps get rid of excess fuel. It has a thing called a relief valve that will open and bypass fuel to the inlet port to prevent excessive fuel pressure.


If the pump can deliver more fuel than the regulator can relieve to provide a consistent pressure to the rails, you're going to get erratic pressures as measured at the fuel rail. Erratic pressure at the rail means erratic fuel volumes being injected.

The stock FPR won't have a problem relieveing pressure and if I did.....changeing the FPR wouldn't fix it the size of the return line would have to be inlarged.

Yes a pump supplies volume, and if the FPR can't also flow enough volume, the pressure WILL build behind it i.e. in the fuel rail.

Like I said above if you run into this problem......You'll have to inlarge your return line to the tank.

But coming to think of it, I don't think the stock FPR will be overpowered by a 255lph pump. [/QUOTE]

No it shouldn't.

http://www.240sx.org/faq/articles/fuel_pressure_regulator_wo.htm

There's a threshold of flow when the fpr is fully open and essentially just becomes a 3/16" tube.

That's when I'm talking about it not being able to regulate effectively, but 255lph from a walbro is not that limit.

In this case, you'll have to upgrade the FPR to accomodate a bigger return line.