Jump to content
SAU Community

Recommended Posts

hey guys..

i have an r33 s1 gtst with the rb25det in it.. the car has an apexi n1 exhaust, frontmount cooler done by plazmaman, splitfire coil packs and an apexi avcr which just died (havnt worked out why yet but happened after the car got these next problems).. it has recently developed a problem out of nowhere and is running really rich i think (black crap all ova back of the car that it never used to get) but it will not boost properly, it hesitates badly or just cuts out altogether untill i let my foot back off the gas and is slowly getting worse, now it is gettin hard to drive off boost and its even starting to idle funny..

can anyone please help i dnt want to pay a performance shop if i can help it..

Link to comment
https://www.sau.com.au/forums/topic/344155-r33-rb25det-running-extremely-bad/
Share on other sites

thats what i thought also but can seem to visually find any loose piping or worn silicone joins or clamps, it does get up on boost sometimes but its very hard to get it there.. may have a try at presurising it tomos and see how that goes..

just took it for a drive then and after i try give it a bit of gas and back off throttle while getting on the clutch it wants to stall and sometimes does stall.. and its still idleing very rough

any other ideas anyone

once pressurized, spray some carby cleaner or soapy water on the joints

if your running an atmo bov, make sure that the return is still blanked off, could have come loose or popped out

ok so i pressurised the pipe work and no leaks.. disconnected all the avcr gear and its a bit better n standard boost but is still really laggy!!

any other help would be great tryin to fix it all up be4 my sisters formal next week

few years back mine started running rough under decel and accel and black soot over the ass end but ran sweet when cruising. ended up being a cracked CAS bracket and timing was out.

few years back mine started running rough under decel and accel and black soot over the ass end but ran sweet when cruising. ended up being a cracked CAS bracket and timing was out.

+ 1

had a broken cas bracket on my 32

how much pressure did you put in the pipng?

other possibility is the AFM is dodgy

hey mate i just held it on for like a min and its a big compressor that runs my whole shop i assume the pressure was really high tho..

i swapped the coolant temp sensor and it seems to be running fine all the way through the revs @ 5psi but as soon as i switch it to 9psi it boosts up and then cuts just as the guage hits 9psi.. any chance it may be a dodgy stock fuel pressure regulator or even a tired fuel pump

CAS is on the front of the motor. round thing with 3 10mm bolts holding it on that when loosened allow you to turn it sideways a little bit (to adjust the timing). has a plug with a few wires in it coming out the side.

could possibly be a fuel pressure issue, but i don't really think so

going to ask a stupid question, but you aren't using the stock gauge as your only boost gauge are you? it you are then that is the reason why you are having issues. it doesn't read in PSI, so what you think is 9psi is a buttload higher. about 18psi in fact, and any issues you are having is the ECU going into it's protection mode.

CAS is on the front of the motor. round thing with 3 10mm bolts holding it on that when loosened allow you to turn it sideways a little bit (to adjust the timing). has a plug with a few wires in it coming out the side.

could possibly be a fuel pressure issue, but i don't really think so

going to ask a stupid question, but you aren't using the stock gauge as your only boost gauge are you? it you are then that is the reason why you are having issues. it doesn't read in PSI, so what you think is 9psi is a buttload higher. about 18psi in fact, and any issues you are having is the ECU going into it's protection mode.

na mate using an aftermarket guage one on the dash is disconnected.. and the cas appears to be fine.. i am starting to stress out cos i cant figure it out lol and being on the coast i dont know what shop i can take it too.. i did take my cars to the throttle shop at gosford but they are gone now

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

    • I'm so far behind in the jobs I have to do at both work and home (including car) that I have become immortal. There's simply no way that I can die now.
    • Each to their own I guess  Me, I put just as much time into cleaning inside of the cars as I do on the outside As for getting wet, it is really no different than steam cleaning the carpets at home, apart from the cars carpet dries alot faster than the house, again, I only do it in the hotter months and leave the car opened up for a few hours As I only do it yearly, it is just before I do the diff and gearbox service, so I clean the carpets, then it's up on stands, wheels off, service, clean the undercarriage,  grease the bushings and do a nut and bolt check on everything  Disclaimer: I typically had all the time in the world to kill when I was working 🤣, so spending a full day or 2 cleaning, serving and "looking at stuff" was,  easily achievable, and a fun mental therapy day As for time to kill, I retired last Wednesday, so apart from my physical training, my days are filled with lots of random jobs around the house and garden...."Idle hands are the Devils something something" I am also buying a new house sooner rather than later, I'm actually looking at a potential property tomorrow, I'm looking forward to getting a car hoist as I'm starting to get to old to crawl around under a car, I can only imagine all the undercarriage cleaning and looking at stuff when that gets set up
    • Yeah, I'm not interested in wetting the carpets, and I don't care about brown dirt/dust that lives deep in the pile or underneath. It's not like I crawl around on them in my birthday suit or eat dropped food off them (because there is never any open food in my car). The seats are alcantara (cheap Chinese imitation alcantara, to be sure!) with barely 1" of foam pad behind the surface. That's not getting wet either. Any car that I would be happy to get the interior wet, I would not care to put the effort into.
    • We have one that holds 2.8L of water. On floor carpet that hasn't been touched in 2 or 3 years, will take a minimum of 2 fills of the tank to do a bedroom, and that's going AROUND the bed.   In the cruiser, I used an ENTIRE 2.8L tank, just on the front passenger footwell. But it had some fungus growing, and had been full of mud from being used as a 4WD for many years. I can do that floor again, and it will still pull mud out. However, the water now only looks dirty, not pitch black and leaving full sludge in the bottom of the tank it sucks back into. Oh, and, this is about a $1500 unit.
    • This is mine, works a treat for the cars, suction is good, I use the Bissell clean and protect stuff I have found giving it a good spray and light scrub with the soft brush on the head of the nossle for carpet, and a rub with a microfibre for cloth seats and cloth door trims, prior to another quick spray before vacuuming it up works the best @GTSBoy You would surprised on what it gets out of carpet and seats that actually "look" clean, I recommend that you test drive yours when you have a little time to kill, then post pics of the muddy looking water that I believe you will find
×
×
  • Create New...