boost problems

[makaveli]

Hi my names Mark,

Just yesterday I had experienced my car having boosting problems. It would rev to 3,500rpm - 4,000rpm and usually you would feel the boost coming on strong. Yesterday it was probably boosting half as much as it should and I am only running the standard 7psi. The boost gauge seemed to be working ok. Although the heat yesterday would have played a part to it as I do not have a front mount cooler.

I waited until later in the nite although it was still a little warm but much cooler than during the day and it still wasn't boosting like it had been previously.

I am lost for ideas, what do you guys think of the problem?

Thanks Mark

[carlo]

Not an expert, but you may want to check the vaccume lines for holes.

[makaveli]

Thanks Carlo I will have a look at that.

Do you think that the weather would have played a big part in the turbo not boosting? Do all of the skylines do that on hot days?

[MrGTST]

Hmmm I think I am experiencing a similar problem... On recently I have noticed that when I put my foot down and the car starts to boost it used to just lauch so to speak, now I can hear what appears to be extra large sucking sounds for a short period then the power jumps in. I don't know if I am being paranoid or not but my boost guage ( standard in dash ) doesnt really seem to begoing as high either..

Is it possible I have a hole in a hose or popped a pipe off or something simple???

[makaveli]

Im not sure but your problem sounds similar to mine. The car sounds a little louder also. I am going tomorrow morning to get it checked. Tomorrow night I will post up what is wrong with it if anything.

[MrGTST]

The other thing I have noticed also is that my oil gauge used to sit around the 4 mark pretty constantly, now it seems to vary quite often ( under acceleration and such ) between 2 and 6?

I have checked my oil and its not low or anything like that....

[SteveR33]

MrGTST: Your problem is certainly heat related, take it out late at night and see if you have the same problem (you don’t have a front mount do you). Mark I think I know what’s wrong with your 32 and I replied to the post you made on the UPI forums!

[MrGTST]

Hmm I think it still happens at night too.... I don't have a front mount yet, but I have one comming from Japan which should be here in a week or two... I am hoping this should fix the problem...

[hippy]

yes i'm wondering that too ... is the oil pressure meant to change constantly ... like lower when the cars not moving ... higher when ur going fast?? cause thats what my car does ... is that normal??

[MrGTST]

yeah thats what mine has been doing recently.... but before my car would only do that until it warmed up then it would just sit a 4....

[GTS-t VSPEC]

MrGTST,

It sounds like a boost leak to me, when you in the drive way pull the accelerator cable and listen for unusual noises, should highlight where the leak is occuring.

I think the oil gauge measures viscosity, therefore it should be higher when cold, and lower when hot.

See'ya:burnout:

[MrGTST]

Hmmm thats what I thought..... Thats why I ordered my FMIC... I am hopeing when that is installed it will fix and leaks that I may have now..... I thought that was also a good way to justify buying the intercooler...