benoss Posted November 28, 2014 Share Posted November 28, 2014 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! Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/ Share on other sites More sharing options...
GTSBoy Posted November 28, 2014 Share Posted November 28, 2014 You want someone to come around and diagnose it for you? Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7433909 Share on other sites More sharing options...
benoss Posted November 28, 2014 Author Share Posted November 28, 2014 Just after some advice on what I should do. The manifold gasket is looking pretty haggard at the moment could it be that? Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7433918 Share on other sites More sharing options...
Ben C34 Posted November 28, 2014 Share Posted November 28, 2014 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. Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7433922 Share on other sites More sharing options...
benoss Posted November 28, 2014 Author Share Posted November 28, 2014 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. Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7433942 Share on other sites More sharing options...
Missileman Posted November 28, 2014 Share Posted November 28, 2014 cars that are 20+ years sometimes shit needs replacing Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7433950 Share on other sites More sharing options...
Leeroy94 Posted November 29, 2014 Share Posted November 29, 2014 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. Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7434081 Share on other sites More sharing options...
benoss Posted November 29, 2014 Author Share Posted November 29, 2014 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 Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7434091 Share on other sites More sharing options...
Missileman Posted November 29, 2014 Share Posted November 29, 2014 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. Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7434093 Share on other sites More sharing options...
benoss Posted November 29, 2014 Author Share Posted November 29, 2014 I've got a walbro 255 here, is that suitable replacement? It's still running stock ecu. Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7434116 Share on other sites More sharing options...
Ben C34 Posted November 29, 2014 Share Posted November 29, 2014 Yes Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7434118 Share on other sites More sharing options...
Leeroy94 Posted November 29, 2014 Share Posted November 29, 2014 Walbro 255 is good. Another thing that is wise is upgrading your wiring. Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7434119 Share on other sites More sharing options...
Sinista32 Posted November 29, 2014 Share Posted November 29, 2014 clutch? Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7434121 Share on other sites More sharing options...
benoss Posted November 29, 2014 Author Share Posted November 29, 2014 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! Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7434143 Share on other sites More sharing options...
benoss Posted December 1, 2014 Author Share Posted December 1, 2014 Changed the fuel pump. Exchanged the standard one for a walbro gss341 and now my car won't even start? Any ideas? Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7435177 Share on other sites More sharing options...
Ben C34 Posted December 1, 2014 Share Posted December 1, 2014 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? 1 Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7435222 Share on other sites More sharing options...
benoss Posted December 1, 2014 Author Share Posted December 1, 2014 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! Link to comment https://www.sau.com.au/forums/topic/451182-rb20det-dying-off-at-5000rpm/#findComment-7435479 Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now