Boosted R33 Playing Up, Help!

[black_gtst]

hey!

just wonderin if anyone can tell me wats goin on wit my car! i installed one of them turbotech boost tees, bumped the boost up to 10psi, ran well for a short while then started missing n spluttering inbetween 4000-7000rpm. i scored some free dyno time (only rwkw readings), after adjusting boost found the only way i could get a decent kw figure without it missing and carrying on was to set boost on maximum 7.8psi.

does this mean i need to get my car on a dyno that can plug into my ecu and change air fuel ratios, timing ect? just wondering what the next step is with it and why my car is doing this when i have heard people saying that they can run 10psi constantly on fairly stock 33's n not have any dramas at all!

mods on my car are full exhst, hks pod, boost controller n heavy duty clutch

thankls for the help guys!

Brett

my_car_wit_wheels.bmp

[paulr33]

its been covered a few million times. its the factory ecu protection detecting excess airflow. time for a piggyback computer.

cant tune the stock ecu so u need a piggyback or aftermarket engine management

[smurf80]

Spark plugs??? my thought or maybe a dodgy coil....

Mine is on 10psi and I have no problems whats so ever havent hit boost cut once..

Chris

[12DFY]

Spark plugs??? my thought or maybe a dodgy coil....

Mine is on 10psi and I have no problems whats so ever havent hit boost cut once..

Chris

Yeah i agree, spark plugs mate. The gap would be too high, factory gap is like 1mm which is great for standard boost but as air is compressed more you need stronger spark to ignite it. Drop your spark plug gap down to about 0.8mm. This should fix most problems. The computer on the skyline will run horribly rich after about 10psi, so when you want more than 10psi you need to start looking at ECU stuff!

[brother_david]

Sounds like my problem to, currently running 12.3-12.5 psi, no problem for a while, but now it has started to act similar to what black_gtst's car is doing, very annoying, first i thought it might be a bad connected cable, but after reading this ill have a look at the sparkplugs!

[Guilt-Toy]

Gap your plugs to .6 or .8 and it will fix the problem

what happens is that the extra boost puts out the spark =)

[chrissso]

Sounds like either one of 2 things.

It's running 2 rich and is having trouble igniting - regapped sparks ^ and a piggyback like SAFC ^^^^^ will help fix this.

The other is the ECU is pulling back timing and dumping more fuel in because the knock microphones are picking up excessive noise or knocking, which is indicative of another issue. e.g., leaning out, or intake temps are to hot, the list goes on, etc.

[mr_r33gtst]

Hey Dude!

My r33 is fairly standard, with a turbo back zorst, and 10psi. I am using bkr7e with the gap of .8, and is running perfectly fine.. o try the .8 gap GL

[black_gtst]

mad as!

thanks heaps guys much appriciated!

will put em down to .7 tomorrow n let you know the outcome!

brett