Adjustable Fuel presure regulator for 420a

[Jeff99GS]

I need help building a fuel system for my 99 420a eclipse. Can anyone tell me what is the best kind of Fuel presure regulator to get? My car has the evap system with the regulator out back near the fuel filter. I'm Turboing the car, and I dont know what to get, Can I just Use the stock FPR?? its kinda hard to find parts for this car. I live right buy SUMMIT and they don't have anything for this car.

 

[DSMcrazy3]

If you won't be running over 8 psi, which is nearly the limit on stock internals your stock FPR will be fine. You just need something to increase the fuel pressure during boost, ex: 12:1 Vortech FMU. If you plan to run more boost, most people go with the Aeromotive 1:1 AFPR. There isn't a specific one for 420a, they're universal.

 

[Jeff99GS]

You just need something to increase the fuel pressure during boost, ex: 12:1 Vortech FMU.

Ahh I see, thanx for the help. So where can I get this vortech FMU? What happens if you go over 8psi on stock internals? will you detonate? or just break from too much power? the car has 100,000 miles on it but they are all highway miles and I have had the car since it was brand new...I took very good care of it and it seems to run great still. Should i not be turboing it with out a rebuild? It has had the head gasket done, and the timing belt done. I just want it to be quick, I have a 75 shot of NOS on it ....will the turbo at 4-8 psi be as quick as that?

 

[DSMcrazy3]

I'm not too sure of the relation of a XXshot of nitrous compared to XXpsi of boost. I know 4-8 psi will in fact give your car quite a bit more go than it has N/A. Especially closer to 8psi.

FMU can be had many places. Ebay being one of them..If you have a 12:1 FMU and want to exceed 8 psi and are still on stock injectors you will lean out, the FMU will not be able to raise enough fuel pressure and will cut out.

I can say your engine will be fine and I could be right or wrong and I could say your engine will blow up after its first run under boost. The only way to tell the real condition of the motor without ripping it apart is to run a compression test and see what #'s you yield. It's a simple task and will take all of 20 min. if even.

People have boosted 10psi fine on stock internals, but with the simplest fuel set-up of 12:1 FMU, Walbro 255 fuel pump and stock injectors 8 psi is the limit, and not many care to spend the money to venture beyond that until they rebuild and can raise the boost more than 2 psi.

 

[Jeff99GS]

So I should get A fuel pump and the FMU for sure? will it lean out if you just use the stock pump, regulator and FMU?

Right now I have a Garett t3/t4, JDM sport Intercooler, type rs BOV, Missing link, Manual boost control, and all the piping and stuff too.
If I just installed all that stuff on my car with stock Fuel pump and ran 8psi do you think it would go lean?
I have an Air Fuel gauge so I can keep an eye on it, and If I run 94 octane fuel that would help. But if you think I should get the fuel pump and FMU then I will. Why wont the factory MAP sensor see the increased air and add the right fuel mixture?

 

[BigRand]

I don't want to be bench racing about turbo vs. Nitrous, but general consensus is that turbo is a lot better on the motor.

A 75shot of nitrous is supposed to add 75hp gain to your brake horsepower.

Using just the star turbo kit at 5-6psi, I added an extra 70 Wheel horsepower.

You should try PM'ing GSgoingfast because he's one of the wisemen NT's on here who used nitrous and switched over to turbo.

 

[Blitzeclips]

You will need something to raise the feul pressure while going into boost. This is what the FMU would do for you, and the pump would help deliver the feul incase of starvation from your OEM pump.

If you think about it, that OEM pump has had xxx,xxx miles on it, so if you're boosting now, it wouldn't be a bad idea to buy a new one regardless. Just insurance and peace of mind I guess.

 

[Jeff99GS]

Ok, so I see this Vortech 12:1 FMU on e-Bay.... do I remove the stock fuel pressure regulator? or leave it on? Does this FMU attach to the fuel rail with 4an- line? I have the
96+ evap system with the FPR in the rear near the fuel filter

 

[DSMcrazy3]

Why wont the factory MAP sensor see the increased air and add the right fuel mixture?

You will need a missing link to bleed the positive pressure(boost) off before the MAP sensor sends the signal to the ECU. If the ECU were to see that high of voltage it would flip out and think something is wrong, cutting fuel supply. FCD will do the same thing, just will bleed off the voltage before the ECU instead of the air before the sensor.

This is where the 12:1 FMU comes into play, it's vacuum/boost operated. Under vacuum, the manifold pressure is in the neutral range. The voltage being sent to the ECU from the sensor is fine, so the ECU will supply fuel, once you boost, the pressure will go through the line to the FMU, raising the pressure in this case for every 1 psi of air, the fuel will be pressurized to 12psi.

Ok, so I see this Vortech 12:1 FMU on e-Bay.... do I remove the stock fuel pressure regulator? or leave it on? Does this FMU attach to the fuel rail with 4an- line? I have the
96+ evap system with the FPR in the rear near the fuel filter

Your FMU needs to be mounted near the gas tank under the car using the high pressure 1/4" diameter fuel hose. You can get it at any autoparts store. This is when I wait for Paul to come in with his killer FMU diagram!

(You leave your stock FPR hooked up.)

 

[VelocitàPaola]

Here ya go...

You must be logged in to view this image or video.

 

[Jeff99GS]

I got it thanks for the info! I Just ordered the Vortech 12:1 FMU of ebay and the walbro 255lph pump. Is that all I should need to safley run 8 psi?

I Have the 1999.... so I should be looking at Configuration2 In your diagram right?