Rb20Det Dying Off At 5000Rpm

[benoss]

Hey guys, so my r32 boosts fine up until just before 5000rpm and then I kinda just dies off and only gains revs quite slowly. It's as if it's kinda staving for fuel as it'll sometimes splutter a tiny bit like not bad but it does every now and again. I'm leaning towards fuel pump and it takes awhile to start in the morning when it first gets started like it'll fire and then stall unless I rev it up. It used to pull so much harder when I first purchasing the car around a year ago. All is pretty standard, rb25 turbo, front mount splitfire coils and that's about it. Thanks in advance!

[GTSBoy]

You want someone to come around and diagnose it for you?

[benoss]

Just after some advice on what I should do. The manifold gasket is looking pretty haggard at the moment could it be that?

[Ben C34]

Gasket must be majorly rooted for it to actually look bad with a manifold still attached.

If you think its the gasket and or fuel pump replace them.

[benoss]

It looks to be falling apart in like the places where you can see it, so I'll replace that and do the fuel pump and hope all is good after.

[Missileman]

cars that are 20+ years

sometimes shit needs replacing

[Leeroy94]

If you think its a gasket, get a hose or piece of flexible pipe and put one end to your ear and with the other end scan the outsides of the manifolds. If there is a leak you will be able to hear it.

Of course the car needs to be running to do this.

Other basic things to check are:

Fuel filter

Fouled plugs (spluttering) - also check spark plug gap if you have feeler gauges

Fuel pump - as mentioned

Wouldn't hurt to do a compression test. Engine could just be tired in general.

Without tuning, the rb20det engine torque curve starts decreasing at around 5500-5700rpm anyway. Unless you're in 1st or 2nd it doesn't really pull hard past those figures.

[benoss]

And also, when it gets to like 5000rpm there's a change in exhuast note and it just goes like really loud but doesn't go anywhere

[Missileman]

check your fuel pump, if it's the original item, scrap it and put a new one in. If it is the original it could be leaning out and and the computer is going into the knock maps.

[benoss]

I've got a walbro 255 here, is that suitable replacement? It's still running stock ecu.

[Ben C34]

Yes

[Leeroy94]

Walbro 255 is good. Another thing that is wise is upgrading your wiring.

[Sinista32]

clutch?

[benoss]

Nah defiantly isn't the clutch, I'll try the fuel pump and let you's know if it changed anything. Thanks for the help!

[benoss]

Changed the fuel pump. Exchanged the standard one for a walbro gss341 and now my car won't even start? Any ideas?

[Ben C34]

Changed the fuel pump. Exchanged the standard one for a walbro gss341 and now my car won't even start? Any ideas?

put feed and return lines on wrong way?

[benoss]

Nah I'm not sure what was wrong, swapped it for a 33 gtr pump I had laying around and all is sweet now. No more drama's thanks for the help!