Rb25Det Spitting

[top13s]

hey guys im wondering if any one else has had this issue and how you fixed it.. my s1 r33 is spitting and carrying on from around 4k almost till red line, ive used a hotter spark plugs before but that seemed to be a tempory fix. this time i went a temp range colder and its worse than before. im running 12 pound boost on the stock det wit jus a front mount and an exhust.

any help is much apreciated thanks gaz

[Moodles2]

12psi on a stock ECU? try turning down the boost

[ae86 boy]

$100 says fuel pump. chuck in an 040 and youll be laughing

[savage1987]

I have a similar problem in a 33 s1 ... fuel pump done but no fix

http://www.skylinesaustralia.com/forums/topic/394347-rb25det-boost-control/

[top13s]

im thinking for the moment ill go back to the hotter plugs, and ill try winding the boost down... i have ran 14 psi thro it before with out any problems, (it jus kept hitting boost cut when it spiked).

i was thinking it could be a fuel issue but i have a feeling its more spark issue like the fuel isnt being ignighted properly :S

i have a malpassi adjustable fuel reg to put on i just need a fuel pressure gauge to put on it and i was told to do a bigger fuel pump to go with my new gt30 turbo.

i have also been told that possibly the injectors could be carboned up a lil. so they are spraying droplets instead of a mist (but this dosnt entirely make sense to me as the car has ran fine before with the hotter plug) but it does seem to foul them anyway (they carbon up then dont fire properly) wich is wat makes me think its a spark/fuel issue..... id like some one to confirm it really or tell me its a silly thing ive over looked, im not to familar with rb engines atm lol

[Bsa]

R&R rich and retard turn the boost down

[SargeRX8]

Spitting and carrying on, you're either misfiring or lean popping. R&R will not cause splitting and sputtering. It pulls timing and pumps fuel. Misfiring will cause the car to spit, fart, splutter. Lean popping is the same kind of thing but you can distinguish lean pop from a misfire.

[rondofj]

Coilpacks?

[Bsa]

At 12 psi It will cause issues if it still does not fix the problem then install coilpacks

[SargeRX8]

At 12 psi It will cause issues if it still does not fix the problem then install coilpacks

Ive had my car hit R&R when the old shit boost controller decided not to work. It wouldn't splutter, you just instantly lose all power. It revs perfectly fine, but makes no power. Spluttering is the symptom of another issue.

[Bsa]

Running to rich will cause misfire. My mates 33 was hitting r&r at 10.5 pound it car misfiring and driving like shit turned the boost down 1 psi to 9.5 and it drove perfect after a plug change as they fouled up nothing else was changed now it pumps around town no prob

[top13s]

lean popping?? ive never heard a car do that before.. it is a diferent sort of popping to rich, but my bumper is black as from running rich lol so i didnt think running lean would be an issue.

i wound the boost down to 9 psi thismorning, jus driving around normaly is fine but when u pin it it still does it jus not as bad. i got new plugs that are slightly hotter and i have an adjustable fuel reg to put on, the timing did cross my mind to but i wasnt to sure

[Stevoss]

Definitely coil packs, check around the head for any signs of arcing, at night with no lights on you can sometimes see them jumping across.

[The Mafia]

sounds rich to me.

Very much like R&R too....

put the boost on 9psi and I bet it goes faster

[bubba]

Sounds like spark breaking down..

My money is on coilpacks or coil harness (the plugs go brittle over time and fall apart).

[top13s]

it has been going better and seems to pull a bit better to im on 10 psi atm. i was lookin at coil packs a wile ago i got quoted $600 super sparks at auto barn

[chris_82]

Dont get super spark coil packs at that price, get the splitfire, there better. or u can get yellow jackets for about $400. there all on ebay