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Rb25det Acting Strange.... Help

Jbunn2001

By Jbunn2001,
in Engines & Forced Induction

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Jbunn2001 Rookie

Jbunn2001

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Posted (edited)

hi guys, im from the states and i need of a bit of help with my r33. ive checked the turbo, its good in working order, i just changed plugs and checked gaps for each. the car runs super rich about 9-10 a/f at low throttle just cruising, however at WOT the car leans out as it builds boost and jerks violently. also if i hold the throttle about half way it will build about 3 or 4 pounds and feels as if im brake boosting, suction from the intake/turbo is loud but no acceleration without the jerking. but as soon as i punch it it knocks and flips out. i changed plugs again and no help also checked vacuum sources and double tripple checked everything. im at a loss. there are no check engine lights. 127km on the car and motor. also car reacts the same way with the boost controller on or off.

mods include:

pod filter

front mount

turbo back exhaust

greddy profec boost controller at .6 bar

afc neo with decel at 1% throttle, 1.2 at 1000 and 3.8 at 2000. no tune.

thank you all for your help.

Edited by Jbunn2001
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https://www.sau.com.au/forums/topic/192259-rb25det-acting-strange-help/
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Redback Proficient

Redback

Posted
Posted

ive only experianced this once. and im sure you've probably checked i i found i tiny hole in the intake pipe just after the cooler... was fine cruising... hit the throttle and yeah feels like break boost then WACK and big jerk of the car.

replaced the silicone hose no problem from there on.

Jbunn2001 Rookie

Jbunn2001

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Posted

ill try that again, maybe i over looked something. also for an update i just drove the car after i did nothing...... lol and it hiccupped a few times and was maintaining boost, but i ran ass rich this time all the way through only hit 12.2 after the hiccup then back down to 9.9- 10.3. so im thinking of a few things i need to address.

Coils.... ive already ghetto taped mine hoping they wouldnt arch

AFM- but i would assume i would have a check engine light

or... i stilll dunno.

i will check the intercooler piping and change the silicone cupplers and get some propper t-bolts.

thanks again

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