Car falls flat on its face at ~5000 rpms in boost?

[Tchao]

Are you using a stock fuel pressure regulator? They kind of really don't work right at all for + atmosphere.

And how is that?

[Danny]

Turned out to be a bad coilpack.

[blueapplesoda]

I've been running my 3bar bosch stock fpr for 2.25 years through Vortech FPR's, 16 psi of boost, and all sorts of abuse, and it still works fine....

[Danny]

Other possibilities:

Are you using a stock fuel pressure regulator? They kind of really don't work right at all for + atmosphere.

Yes stock 3bar regulator.

Stock internals of the M42s wont take to boost to well either could be detonation.

Repost.

[Liam]

Other possibilities:

Are you using a stock fuel pressure regulator? They kind of really don't work right at all for + atmosphere.

Stock internals of the M42s wont take to boost to well either could be detonation.

[Danny]

On second thought if u used an fpr (pre-ms) with the stock fuel pump then your pump probably failed.

Thats what M3Ryan said as well when I called him.

I already ordered the pump and I'll get the fuel filter as well.

[blueapplesoda]

On second thought if u used an fpr (pre-ms) with the stock fuel pump then your pump probably failed.

[blueapplesoda]

Fuel filter? I used a walbro in my setup and they use these stupid little sump filters that get dirty and clogged really fast and caused my car to choke up and the afr's went lean around higher rpm/boost. Could be a problem.

[Jbpka06]

When I rev it with MS connected the gauges on the laptop show the fuel pressure goes to negative.

Doesnt there have to be something sending a fuel pressure signal to the MS for that reading to be accurate? I didn't think there was a fuel pressure signal unless you added an aftermarket gauge sender.

[xwill112x]

LOTS of whine from the pump.

that should be a immediate indicator.
if i were you, i'd replace the fuel filter while i was replacing the fuel pump. ;)

[Rolla1990]

I had this problem when I first went MS, it turned out to be the overboost protection setting in the tune. I had it set too low so it would cut the spark out once the car reached full boost. Maybe your boost controller is letting your car overboost?

[dashboardmonkey]

Whack the panel above the fuel pump a couple time with a rubber mallet when it starts falling on its face.

[wolfgangstbd]

when my fuel pump died my car actually couldnt stay alive unless it was about 3000 rpm but it wouldnt even reach five.. oh i would have to say the biggest symptom i noticed is the rpm's would bounce around alot at idle by like 2-4 hundred rpms. and it got worse after being on brakes kinda hard

[Danny]

LOTS of whine from the pump.

When I rev it with MS connected the gauges on the laptop show the fuel pressure goes to negative.

I'm pretty sure its the pump, just wanted to see if there were any other ideas.

[Erick]

No whine from the pump? Check fuel pressure?