1G Fuel System Help!

[johnny boy 93]

Hey Guys!

I am currently about to do a whole bunch of upgrades to my car. I have a 1g 2.0 turbo, engine with an evo turbo. I just bought a DSM Link, and I am going to turn up the boost in my car ( Maybe 20 PSI MAX). I am wondering what I have to upgrade in my fuel system to do this properly. I know I need a fuel pump, and probably a FPR, but which pump, and which FPR. Also how this Fuel Pressure regulator works, I dont quite understand, and how to install on a first gen is even more vague. I have EVO 550 cc injectors that are also going in. Now I want to make sure I do this properly, because the motor in my car is freashly rebuilt, and I want this car to have driveability, as well as lots of power (hence the DSM Link). The only time I will probably turn up the boost that much will be at the track. So please educate me on what else I need, and what brand, and how to install a FPR on a 1g. Thanks in advance
John

 

[Gstclipse69]

Most people go with a walbro fuel pump, either 255 or 190. With only 550s going in the "rewired" 190 will be fine. A 190 will also not overrun your fuel pump. However if you go ahead and get a 255 you will need the fpr because it will overrun. Depending on your future plans for the car, if you ever want to upgrade then go ahead and get the 255, they are about the same price.
Also rewire whatever fuel pump you get so it wont drop voltage in higher rpms.

 

[1992awdlaser]

A 190 will also not overrun your fuel pump.

You mean "A 190 will also not overrun your fuel pressure regulator."

Original poster, get a Walbro 255 fuel pump and rewire it. The fuel pressure regulator(fpr) I have is an aeromotive and would recommend it. That turbo can max out those injectors fairly easily also so I would watch your injector duty cycle on Dsmlink.

The fpr keeps the fuel pressure at 37 on a 1g during idle and cruise situations. It has a vacuum line hooked up to it so it can adjust according to boost/vacuum. When it see boost it will raise the fuel pressure 1psi for every psi of boost. It does this because when boosting the boost will push against the injectors where gas comes out of limiting how much comes out. So when it raises the fuel pressure it makes up for the boost that is pushing against the injectors so they flow correctly. The fpr limits fuel pressure by bypassing fuel back into the gas tank so it doesn't build up in the fuel rail which would increase the fuel pressure. When you put a 255 on the pump flows so much that the fpr can't bypass enough fuel back into the tank to keep the fuel pressure down. So if you were to keep a stock regulator on the fuel pressure would be higher than stock during idle and cruise situations which would cause the car to run rich. It would also have the possibilty of washing down the cylinder walls with fuel which would eventually contaminate the piston rings. So that would make you have to rebuild your engine sooner than normal.

 

[johnny boy 93]

Ok, I understand. I don't plan anything to the engine for a little while after this. So the 190 lph is probably the way to for me? Anybody else got an opinion?

 

[snowborder714]

If you ever plan on putting a bigger turbo on (which it sounds like you probably will ):
-255lph Walbro fuel pump
-rewire kit for fuel pump
-AFPR (I recommend Aeromotive, but there are other brands)
-other items for AFPR installation (AN fittings, fuel line, fuel rail adapter, gauge, etc.)
-larger injectors (eventually)

Just do it right the first time. Yes, it may be more $ and more work, but then you won't have to touch it again.

I'm running a rewired 255lph, AFPR, and 1150cc injectors with my stock engine and small 16g. Yes, it's overkill, but I plan on going big someday and will probably not have to upgrade my fuel system (although I plan to).

 

[johnny boy 93]

Ok, so how by adding the FPR i can lengthen the life of my pistons and rings? That kind of makes sense to me. ghow much did you pay for your FPR if you don't mind me asking? Also anybody got an install faq? Anything else I have to do with the 255 lph? Any advice or opinions appreciated.

 

[johnny boy 93]

If you ever plan on putting a bigger turbo on (which it sounds like you probably will ):
-255lph Walbro fuel pump
-rewire kit for fuel pump
-AFPR (I recommend Aeromotive, but there are other brands)
-other items for AFPR installation (AN fittings, fuel line, fuel rail adapter, gauge, etc.)
-larger injectors (eventually)

Just do it right the first time. Yes, it may be more $ and more work, but then you won't have to touch it again.

I'm running a rewired 255lph, AFPR, and 1150cc injectors with my stock engine and small 16g. Yes, it's overkill, but I plan on going big someday and will probably not have to upgrade my fuel system (although I plan to).

Ok i got understand, but here is my quandry. I have no faqs or anything to understand how to do this FPR, and what other fittings do you mean? What do you mean fuel rail? I thought they sat completely seperate from the fuel rail.

John

 

[1992awdlaser]

Ok, so how by adding the FPR i can lengthen the life of my pistons and rings? That kind of makes sense to me. ghow much did you pay for your FPR if you don't mind me asking? Also anybody got an install faq? Anything else I have to do with the 255 lph? Any advice or opinions appreciated.

The Aeromotive fpr will keep the fuel pressure correct so it won't wash down your cylinder walls with fuel thus keeping the rings wearing correctly. I bought mine from Welcome To Slowboy Racing and would recommend them. They have a kit that you can buy from them that includes line for the regulator.

 

[snowborder714]

You will need a fuel rail adapter if you go with SS fuel line because you need to have a male AN port for the AN fitting (on the end of the SS fuel line) to screw into. And since the stock fuel rail doesn't have this port, you get an adapter that screws into the end of the fuel rail (completely bolt-on) that has an AN fitting on it.

Take a look at these kits:
Non-SS Fuel Line - ImportEvolution.com - Import Performance Parts, DSM, WRX, Supra, Honda
SS Fuel Line - ImportEvolution.com - Import Performance Parts, DSM, WRX, Supra, Honda

Those should include everything you need to install an AFPR. If you'd like to piece together your own kit, check out this tech article:
http://www.dsmtuners.com/forums/articles-engine-fuel/228159-how-build-your-own-afpr-kit.html

If you have any more questions on what all parts you need, let us know. I've got a list of the parts I used and could send it to you.

Edit: Here's another good tech article that has some pictures:
http://www.dsmtuners.com/forums/art...lling-aeromotive-fuel-pressure-regulator.html

 

[1992awdlaser]

This is the kit that I bought. Slowboy Racing, Inc. :: DSM :: Fuel :: Fuel Pressure Regulators :: AER 1G/2G Complete SS FPR Return Line Kit