Boosting Problem

[Mid_Nite_R33]

Hey all ! I'm new on here and to my to my nearly stock R33 gtst S2. I got an issue with it, when I put my foot down and give it some, the stock boost gauge on the dash never goes to the max of 7 psi, more like a steady 3- 3.5psi. The turbo is leaking a bit of oil and I had the car serviced and checked for vacum, intercooler leaks etc. Is it the turbo thats gone? any ideas? Thanks heaps.

[Ionos]

Hey all ! I'm new on here and to my to my nearly stock R33 gtst S2. I got an issue with it, when I put my foot down and give it some, the stock boost gauge on the dash never goes to the max of 7 psi, more like a steady 3- 3.5psi. The turbo is leaking a bit of oil and I had the car serviced and checked for vacum, intercooler leaks etc. Is it the turbo thats gone? any ideas? Thanks heaps.

<{POST_SNAPBACK}>

Have a look at the factory boost gauge, notice how it says "x100 mmHG". That stands for "millimeters of mercury" ... IE, it's not measuring boost in PSI.

The 7 on the gauge is actually about 14 PSI, therefore in stock form it should go about half way to 3.5, so everything it hunky dori!

[Mid_Nite_R33]

Thanks for that Ionos! Another great thing i found out yesterday when my car got serviced, I had no air filter in it at for days since i bought it, and I've been driving it any possible issues or damage it could have caused ?eg. air flow meter? What should I do now ? Thanks heaps.

[Ionos]

Thanks for that Ionos! Another great thing i found out yesterday when my car got serviced, I had no air filter in it at for days since i bought it, and I've been driving it any possible issues or damage it could have caused ?eg. air flow meter? What should I do now ? Thanks heaps.

<{POST_SNAPBACK}>

I wouldn't worry about it, unless you've driven through a lot of dust, dirt roads etc. If it was just normal road driving I'd say you'll be fine.

[Mid_Nite_R33]

Yea i hope its all ok. What ill do is clean the whole airbox and get a soft brush and clean the air flow meter from the outside. I guess if dust and dirt got in the engine it will make my new oil black very quickly right ? So i guess i would up for another oil change.

[Ionos]

Yea i hope its all ok. What ill do is clean the whole airbox and get a soft brush and clean the air flow meter from the outside. I guess if dust and dirt got in the engine it will make my new oil black very quickly right ? So i guess i would up for another oil change.

<{POST_SNAPBACK}>

Use electrical contact cleaner to clean the AFM, comes in at blue and white spray can.

Not sure about the oil thing ...

[Links]

I doubt it'd make a huge difference - unless you've been driving through a dust storm - or on country roads..

As for the boost gauge - yeah should sit at about unde 1/2 when <4,500 - than @ 4,500 it'll go to about 2/3's..

did you know the car goes from 5psi to 8psi from 4,500 rpm onwards?

[rinmak]

I doubt it'd make a huge difference - unless you've been driving through a dust storm - or on country roads..

As for the boost gauge - yeah should sit at about unde 1/2 when <4,500 - than @ 4,500 it'll go to about 2/3's..

did you know the car goes from 5psi to 8psi from 4,500 rpm onwards?

<{POST_SNAPBACK}>

And that you can make it go in high boost mode at all RPM's by doing the following:

http://www.skylinesaustralia.com/forums/in...showtopic=42895

[Mid_Nite_R33]

Yeah i heard that boost change as rpm rises. Everyone keeps telling me that since i bought the car and drove it around with no filter i could have picked up a rock or some other crap which went straight into the turbo and stuffed up the blades or it could be the coil packs thats causing low boost.

Should get a workshop to take off the turbo, get it checked and if it is damaged go back to the guy who issues the RWC or the seller?

[killswitch_13]

If you say your turbo is shot (like you did in the 1st post ) then you'd need a new turbo, but from sounds of things the other guys answers have helped. But if oil is leaking from the turbo... that isn't a good thing!!! should get it checked out and fixed!!!

[Mid_Nite_R33]

Well thanks for your help guys. I got a workshop to look at the car next week and dyno tune it for me, it looks like the stock boost controler isnt connected properly, im hoping that fixing that will end the issue.

BTW i still hear different stories about the stock factory boost guage on the dash board, is it in PSI or BAR, as in max on it is 7 PSI or 0.7 BAR ?

[Duncan]

Ionos already posted the right story it is mm of mercury not PSI or BAR. The boost you are describing is the standard factory boost.

Re the filter, pull the airbox and AFM off the car and clean them with Brake Cleaner, then reassemble with a filter this time. If you got it from a dealer without a filter it is time to go abuse them.

Dirt doesn't get in with the oil if you have no air filter, it goes straight into the combustion chambers where it can really mess up the bores of your engine. Its too late now any damage will be done so just put the filter back.