Lost boost with a 255

[beastn629]

Ok guys. I have a 1g eclipse that is mostly stock. I was running around fifteen pounds until the other day when i installed a walbro 255 fuel pump. I didnt touch anything else when i did it so nothing should have been affected. Since then i have not been able to get the car above ten pounds and i have no idea why. Any suggestions as to what could have happened? Also will a car still run properly with the vacuum hose disconnected from the piece that sits right off the turbo? (i think it is the wastegate actuator)

 

[92_eclipse_GS]

no idea why you lost the boost
but try putting your old pump in and see if you regain the lost boost
and just to be safe attach you vacuum hose

dont quote me because im not all that credible

 

[4G63_Attack]

Your over running your FPR. At this point you have a couple of options:

1, get yourself a afpr
2, install your oem
3, replace it with a 190

what is your goal for your car? what turbo do you want to run and what is your target hp gain??

 

[GnArKiLL70]

do you have the high pressure pump or no

 

[Splitpi]

I am amazed after so many years and ~1000+ posts on this subject that people still wonder why their car runs like crap after they install a 255 with out an FPR.

 

[xdxoxuxgx]

Connect that vacuum line, definitely

 

[snowborder714]

Also will a car still run properly with the vacuum hose disconnected from the piece that sits right off the turbo? (i think it is the wastegate actuator)

If you don't have a vacuum line hooked up to your wastegate, then your wastegate will not open to bleed off extra boost and you'll experience crazy boost creep, or even infinite boost (not sure on the correct terminology here). Not a good thing. At least have a line running from your wastegate to a boost source, if you don't have an MBC or the stock BCS in.

 

[erald01]

Get an AFPR, rewire the pump and connect the vacum hose to the waste gate.

 

[SpiralOut]

without an AFPR, You can kill your motor.

 

[kahl23]

without an AFPR, You can kill your motor.

Excuse me? How exactly would you kill a motor by not running an AFPR? I dont want to sound like a dick, but all I see happening is that you overrun your stock FPR and run insane fuel pressure, which I can't see killing an engine. Yes, the car will run like sh!t, but kill a motor?

 

[bluetlr2001]

Without a afpr you will be runnign pig rich and you will be getting knock from it running so rich. Which will kill your performance because the ecu will be pulling timing. But im not sure it will kill hte motor unless it doesnt retard the timing enough

 

[zimfro]

Overrunning your FPR will cause you to dump gas out the exhaust manifold, thru your turbo, and out the tailpipe. While it may not "kill" your engine, it will cause many problems. Unburned gas can wash oil off of your cylinder wall. Unburned gas can cause your O2 sensor to malfunction. Unburned gas can cause your catalytic converter to become plugged as the catalyst fuses together into a lump. Many of these things untreated will eventually lead to a "dead" engine.

 

[kahl23]

All of those things happen when you use leaded race gas anyway, its just part of having a fast DSM. Run a testpipe except for emissions (if you have them), realize that o2 sensors have a finite lifespan and need to be replaced. I'm not saying that its the best thing to do, but 99% of the time "killing a motor" refers to damaged pistons, valves, etc, not a simple solution like a new sensor.

 

[Splitpi]

Gasoline washing past rings into the oil destroys the oils lubrication properties. Excessive carbon build up due to pig rich conditions foul plugs and cause knock and other potentially damaging things.

 

[kahl23]

How much gas is needed to wash past the rings? I'm sure it depends on the condition of the rings/cylinder walls but I'm curious as to how much would do it. I've run with insanely fouled plugs before and noticed no knock, just that the car felt like it was driving through mud and would backfire constantly, but I can see how fouled plugs might create hotspots for knock.

 

[thazeywood]

one of my friends ruined his motor because he didnt use a fpr with his 255.

 

[robinho609]

i still dont see how u would kill the motor without it

 

[90laserRSfwd]

post a picture of your engine bay, specifically near the section where this vacuum line is disconnected. (which we're all assuming is going to the wastegate actuator).

 

[boostta]

You not killing your engine with a 255 without a afpr.
It is only running like shit.
Buy a afpr an problem solve

 

[LandoAWD]

I am amazed after so many years and ~1000+ posts on this subject that people still wonder why their car runs like crap after they install a 255 with out an FPR.

Maybe we should offer a SEARCH button...wait...

 

[Freerevving]

I think the ones running especially bad are the 255hp's... since most of that extra pressure is at idle.

 

[rEclipserGST]

The unused gas is suppose to recycle back into the fuel pump anyway correct? And its 255lph not 255hp. And EXTRA fuel pressure which is just pushing more fuel into the motor... is NOT going to kill it. Thats like saying "i gave the plant too much water, & it just died"

OTHER THINGS cause motors to die, STARVING the motor of FUEL can kill it... but not getting to much fuel. Thats just ignorant to assume that and argue the point of proving that it actually does. Now say your sorry.

 

[snowborder714]

The unused gas is suppose to recycle back into the fuel pump anyway correct? And its 255lph not 255hp. And EXTRA fuel pressure which is just pushing more fuel into the motor... is NOT going to kill it. Thats like saying "i gave the plant too much water, & it just died"

OTHER THINGS cause motors to die, STARVING the motor of FUEL can kill it... but not getting to much fuel. Thats just ignorant to assume that and argue the point of proving that it actually does. Now say your sorry.

The gas is returned to the tank by the return line.
There is a high flow version of the 255lph pump. I believe that is what freerevving was referring to.

And you can kill a plant by giving it too much water.

 

[92_eclipse_GS]

i drowned my moms plants a few years ago

and lets not argue about too much gas "killing an engine" unless your a certified technician
not to sound like a dick or anything but
arguing is immature
were all grown ups here
or at least young adults

 

[Freerevving]

And its 255lph not 255hp. And EXTRA fuel pressure which is just pushing more fuel into the motor... is NOT going to kill it. Thats like saying "i gave the plant too much water, & it just died"

There is a high flow version of the 255lph pump. I believe that is what freerevving was referring to.

And you can kill a plant by giving it too much water.

Thanks I was referring to the 255lph HP.. which stands for high-pressure. I'm guessing that some people are buying them without realizing it.

I had a 1g with a 255 (non-HP) and it ran just fine, except it ran funny at idle, smelled like a lawnmower and I had to change the oil very often... regardless, I sold the car because I didn't want to mess with that particular car, but it needed an AFPR.

Over-doing anything can have catastrophic results. and yes you can over-water plants... it's not that hard to kill them that way

The first thing I'd worry about is washing the oil from the rings... it might eventually cause ring damage (badly worn/ deformed rings), not to mention it causes decreased compression. Believe it or not, your cylinders can hold fluid that won't quickly burn off during operation (this includes pools of gasoline). Some might think it's impossible, but it's true. If the engine has high-mileage on it, it's almost garanteed to lose a lot of compression since it washes away the hardened coating that's helping it to seal. This is another reason dumping Seafoam down your intake is bad.

The second thing is excessive blow-by... the fuel getting into the oil ruins its viscocity and uses up the detergents... this can also end up damaging your bearings and other parts. Smell your oil... if you can light the fumes with a match then either you've been drag racing, or you've got trouble. If it has a light smell of gas that's normal.