R33 Gtst Shaking In High Revs

[dani3l]

hey guys wondering if yous could help me,

i own a 33 gtst , mods include fmic, pod, turboback exhaust. runnin on low boost 5psi (seemed to have lost a few psi with fmic installation)

Car is fine when you start it in the morning, however before the temperature gets half way, if i rev it in idle, or change gear in high rev, the car will begin to shake real bad and sometimes stall and the engine note changes ( sounds like a v8 just bubbling real loud), its not a big issue since obviosuly you dont rev turbo cars when cold even though it shouldnt do that, however at any time even after driving for a while, my car dosent seem to like being reved past say 4 rpm. The minute i give full throttle in any gear once it hits bout 3rpm it will start sort bunnyhopping abit, then be fine till about 4rpm, then from then on it starts bumping and sounds more and more unhealthy the higher i go. Not sure what it is, but its been happening for a while, thought it could be the coil packs? thats why its stalling if i rev to high in the morning, if not that maybe something to do with the ecu? someone even mentioned i should go for a aftermarket fuel pump? havent worked out the problem yet but some feedback would be great, most cars dont have trouble hitting 5/6 rpm even redline if you want. but my car really struggles to get to 6rpm even with full pedal down, it will do it occasionly if i slowly ( i mean really slowly push accelerator forward. It will if any only slightly increases over 5rpm and wont go any higher.

sorry bout the essay guys lol

thanks alot much appreciated

[dani3l]

oh also forgot to mention, if you change gear over bout 3rpm in the morning after that bubbly engine note comes on, it goes away once the temperature hits almost half, you gotta change gears at like 1 1/2rpm to prevent it stalling. ONce temp is almost half then sound goes away. and i can drive normally

[dani3l]

helppp anyonee??

[dani3l]

[Ant97GTR]

There are heaps of things that could cause these symptoms mate, and without seeing, hearing and taking for a drive it would be almost impossible to work out. I'd take it to a reputable workshop who can diagnose the problems.....

[NickR33]

check your thermostat isn't broken... mine was stuck open making the coolant go through the radiator all the time... meaning it took ages for the car to warm up and it would run like a dog!

[Primordial]

Well i dont know if I can be of much help... But I can tell you my story

But i had the same problem, and also had some mis-firing over 5000rpm in 2nd gear. I noticed it most after getting my car washed a couple of times - god knows why, I still dont know to this day.

SO - I re-gapped my plugs to 0.7mm, and cleaned up my coil packs (cleaned the outside of them as they had some crap on there) and this seemed to rectify the misfiring issue, but in the mornings I still get the spluttering when boost comes on.

I find that if i turn the car on, and drive away within 2-3 mins, it will splutter from about 0.5bar (7psi) onwards. But if i keep it under 0.5 bar for the first couple of changes, then all is sweet after that - i can run through to 1bar (14psi) with no spluttering/misfiring. It's almost like I have to warm the whole system up before being able to reach higher boost or something??? This does obviously make sense, but im lost as to the reason for spluttering

I have just accepted the fact that my car doesn't like being thrashed before it's warmed up properly, and thats that! It's definitely better for the engine to keep it under 3000rpm for the first few gear changes anyway, so I havent bothered going any further than this!

I hope this has given you some insight into what your issue may be. Let me know if you find any resolution for this

[dani3l]

Yeh very similar to mine, car is fine up to 5psi, once it push more, it'l start to jerk, ive recently boosted it up to about 9/10psi and soon as it hits bout 6 it dosent like it. However today i filled up with shell optimax and it ran alrite, i was hittin 10psi with no jerking, so i though for some unknown reason it didnt like mobil petrol. However after a while it begin playin up again, in most cases jerking but sometimes accepting over 5psi. Anyways il definetely try cleaning coil packs as its probably why i cant change gear in mid/high rpm until temperature reaches half. Never taken my car to a workshop before, my old mans a is a mechanic/does skyline compliances and even hes clueless. Thanks heaps hope it helps. il let you know

[Primordial]

No worries mate, I just hope it helps..

Make sure you check the spark plug gaps with a gapping tool, as shortening this to 0.7mm made the world of difference for mine.

-J