Jump to content
SAU Community

Recommended Posts

the other day i uped the boost on my r33 so that it know runs around 10-11 psi but dont know if this model has a boost cut or i have some bad fuel, or maybe time for some knew plug. once it gets boost of 10-11 it splutters and pops through the exhaust. the plugs have done 25000 kms and the fuel im using is mobil.

Link to comment
https://www.sau.com.au/forums/topic/43586-boost-problem/
Share on other sites

sorry as far as i know they have a boost cut for over boosting, I ran 14psi and no drama's, my car did suffer a broken land on piston 6, just when i bought it, because of a failing fuel pump, I found out after the rebuild that the fuel pressure dropped away under load. this was before I did any mods to it. a new 044 and she was a steady pressure again.

Link to comment
https://www.sau.com.au/forums/topic/43586-boost-problem/#findComment-891084
Share on other sites

Cav its your plugs, I just went through the same prob last weekend, car loosing power like spark or fuel cutting at anything higher than 9psi.

I replaced the plugs from fairly new NGK's to Double Platinum Autolits $90 all up and was advised by two different GTR specialist one online in N.Z skylinesdownunder forum to gap them to .66 So I took them as close as I could to that and guess what, it bloody worked, boost is fine all the way to 12psi - not game to take any further till I get a front mount.

Link to comment
https://www.sau.com.au/forums/topic/43586-boost-problem/#findComment-894992
Share on other sites

i found iridiums to be shite in my S13 ... soon as i upped the boost with an EBC it started missing. took the iridiums out and put in just your normal cheapy plugs that are like 12$ a set and it worked a treat. id say find out what is the cheap copper alternative to your plugs (NGK brand still though) and put some of them in at the same gap of .75-.8. for $12 it cant hurt to see if it is just crappy plugs.

yeah u need to dyno your car with a fuel pressure guage to test the fuel pressure. however, if you are upping your boost, it is a sensible option to upgrade your fuel pump anyway, especially if your planning to run the higher boost all the time and more power in the future. an 044 intank replacement is usually a good bet.

if it still has issues and you want to go for a Malpassi pressure regulator, do that after you've done the fuel pump. the Malpassi wont do much good if you have a stock fuel pump coz the pump will struggle to keep up the increased pressure anyway. i had a misfire in my DR30 skyline, changed plugs and leads, reset ecu, upgraded fuel pump, and still had a misfire at around 1bar. after fitting a Malpassi Rising Rate regulator the misfire is now gone.

try plug changing and see how you go to start with though!

Link to comment
https://www.sau.com.au/forums/topic/43586-boost-problem/#findComment-902830
Share on other sites

guys i have changed the plugs with a set of ngk cheapies and still the same. got my mates to watch the ass of it and it is blowing raw fuel out the exhaust. do they have trouble with the coils, maybe one doesnt like the increased boost (extra load). it doesnt play up till high in the revs 5000-6000 rpm. i can run 10-11 psi low in the revs with no trouble.

Link to comment
https://www.sau.com.au/forums/topic/43586-boost-problem/#findComment-909192
Share on other sites

  • 3 months later...
sorry dude havent sorted the problem yet, am thinking coils, or an after market computer its got me stuffed need to get it to someone whos playing with them all the time. i might sell it yet, that will fix it.

luckily it seems it was just my plugs...I hope you get yours all worked out though. Good luck!

Link to comment
https://www.sau.com.au/forums/topic/43586-boost-problem/#findComment-1054385
Share on other sites

guys i have changed the plugs with a set of ngk cheapies and still the same. got my mates to watch the ass of it and it is blowing raw fuel out the exhaust. do they have trouble with the coils, maybe one doesnt like the increased boost (extra load). it doesnt play up till high in the revs 5000-6000 rpm. i can run 10-11 psi low in the revs with no trouble.

Sounds like a fuel problem dumping too much fuel in and choking on it if its coming out the exhaust as a liquid :uhh: - SAFC ll can fix this.

Could be the coil packs, you'll need to tape them up with duct tape. Because the spark can ark out the side which results in the plug not getting the full spark. Do you run the black cover ontop of your coils - Saying Nissan 2498cc etc... ?

Hope that helps.

Link to comment
https://www.sau.com.au/forums/topic/43586-boost-problem/#findComment-1054433
Share on other sites

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 account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Greg speaks wisdom. These dirty old Datsuns are only value when they are cheap. When they are not cheap, there is no value. Sounds contradictory, but it's true. We are now 20 years past the hey day of modifying cheap 90s JDM cars for small amounts of money. This is a different world. If you are rich and can afford not to care about what is effectively wasting money on an old Datto shitter, then I have no reason to argue against it. But if you are wanting to experience what we all experienced back in 2005 (and I bought my car last century!) then there is no way to do it.
    • Short answer: No. Medium answer: No, because you still need to conjure the things out of thin air to bolt them to a NA to make it a NA+T. Long Answer: No - The things you need to conjure - meaning a turbo, intercooling, manifolds, exhaust, intake/manifold/piping, clutch, injectors, fuel pump, AFM (?), ECU + Wiring (woo, N/A loom fun) have to come from somewhere. You could have many scavenged these things from an OEM car that someone had upgraded from and use some of these. This will be cost prohibitive now, especially so in the USA. You'd probably pay the same for newer, upgraded components that are better than old OEM stuff from 25-30 years ago. None of these big ticket items are re-usable for the N/A car. Why not buy new and upgrade while you're there? The only real consideration is turbo and fuel sizing and determining whether you want to stay within the bounds of the OEM engine or get into rebuild territory. These limits ARE lower with a N/A motor and especially N/A gearbox at the starting point. And if you're gonna upgrade those then you may as well consider having them built to begin with. Because everyone here knows you're never far from that next engine rebuild once you start making the power you want... The cars you see on the internet and SAU etc have been built over decades. If you're really clued in... you would sell your US car to somebody for what you paid for it. You would then scour AU JDM pages or SAU and buy a car like Dose's on this forum with your powerful American Dollar. This will save you so much money in the long term. Importing it could be tricky. Or it might not because USA. I have long said the only reason 90's Japanese stuff took off was because a) Japanese people had Japanese cars so that is what they used b) Australians could import these cars to Australia with very minimal changes and use them on the road here c) Neither country had well-priced access to US or EU Sports Cars. I don't believe the JDM scene would have taken off in Australia at all if we had EU priced EU BMW M offerings, or more especially the AUS V8 Scene would never have existed if we had the multitude of US cars like Camaros, Mustangs, Corvettes at the prices you folks do. After all - Do the math. I would say put a V8 in your R34 and that's the smart way forward. It is. I did it. I know this from my own experience. But at that point there's no reason to simply not buy a C5 or C6? It would be simpler and easier and cheaper and bette-
    • Reading all this... hurts lol. I have an ENR34 5MT and I paid an inflated USA price for the car alone, had to do tons of preventative maintenance past that, and so I'm over $30K USD into the car already and haven't even touched power.  I wanted to +t it. Not even trying to make GTR numbers, I'd be happy with 250hp.  Can I get away with paying much less to make that happen?
    • Damn you’ve done well, definitely snapping necks.
    • Great weekend and event. Open fire at the caravan park, perfect weather all day and a great feed and a couple of drinks at at awesome country pub.
×
×
  • Create New...