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Turbo Grinding Sound(less Than 1.5 Sec)

rych

By rych,
in Engines & Forced Induction

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rych Contributor

rych

Posted
Posted

hello, i just got my R33 BNR33 and it is slightly modified with fmic and hks bov, lighten fly wheel, racing clutch and fuel injectors. I am a newbie to turbocharged car and there are a few questions that i need to seek advice from the nice people here. Below are my questions, would appreciate if anyone is kind enough to answer my questions.

1)I do not have any aftermarket oil pressure, boost level or oil temp metres on my car, can someone enlighten me what are the normal value for these readings on the R33 dashboard?

2)I installed an IES GSM alarm on the car, ever since then my turbos are giving some sort of a grinding sound whenever the rpm is below 2k. It sounds like the fins are "spinning and gridinng on something". It sounds normal at higher revs(3k and above). Is this normal?(The sound is most noticable from 1.8k to 2.8k rpm and pick-up seems to be slow, at 3k boost everything is fine and i can feel the boost)

3)what is the stock turbo for RB25DET?

4)What kind of metres should i get for my skyline?eg:voltmetre, boost meter,oil pressure etc (not for show offs, just want to make sure my car is healthy)

5)when they say change their fluids, eg: brake fluid, oil fluid, lsd fluid, bla bla bla, what kinda fluids are there to look for?(sorry, complete idiot here)

cheez Mentor

cheez

Posted
Posted

boost: at the line between 0 and +7 at full boost (+7 = 1bar = 13.8psi)

oil: around 3 on the standard gauge when warm and rising to about 3/4 way or 7 at high rpm and quick rising rpm.

stock turbo is T3. good for 12psi max.

main thing to have in ur car would be boost only. keep and eye on boost spikes if u up the boost.

fluids to change would be oil, transmisson, power steering, brakes too. only when necessary. service the car regularly with the same mechanic and hell be able to keep an eye on what is needed.

with regards to ur grinding noise, its got me stumped. if it was the turbo it would have blown if it was rubbing on the housing. grinding noise could be a rubbing tyre on guard liner or soemthing more than a turbo issue. get a workshop to look at the car. one that understands turbo's.

lineskee 33 Community Regular

lineskee 33

Posted
Posted

Mate if you dont know what the noise is. get it checked out asap. the way you describe it, its hard to pinpoint what it is. im guessing it may be from the gearbox, or your turbo is stuffed.

The oil pressure guage on the dash in a lot of skylines is very inaccurate. I recommend buying boost guage, oil pressure and oil temp. water temp if you want but the rest is for people trying to show off to their passengers.

as for fluids, try doing a search on this site to see what other people use in their cars.

tek_01 Proficient

tek_01

Posted
Posted

grinding noise sounds like what i have between 2 and 2.5k rpm one every gear

its related to the driveline somewhere but don't know where exactly, either clutch or gearbox is my guess but a few mechanics have heard it and said its not to worry about.

Boost feels better at 3k coz thats when the turbz is starting to get a move on, under that and it feels gutless

RBwhatever Veteran

RBwhatever

Posted
Posted (edited)

I'm taking a stab in the dark and say he's hearing the really high pitched squeal noise. And it occurs not on boost but rather in vacuum at a certain vac point.

It sounds kind of like microphone feedback.

If its this sound your hearing, don't worry about it.

Edited by KeyMaker

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