R33 Rb25det Running Extremely Bad

[RU55SH]

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..

[pipster11]

boost leak

probably popped a cooler pipe off

you could make a contraption to pressurize the inlet side and listen for leaks

[RU55SH]

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

[pipster11]

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

[RU55SH]

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

[mad082]

how much pressure did you put in the pipng?

other possibility is the AFM is dodgy

[t_revz]

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.

[pipster11]

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

[RU55SH]

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

[RU55SH]

also were would i look for the cas so i can check it

[mad082]

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.

[RU55SH]

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