In Need Of Some Expertise Please

[MickEdge]

First off,

All rhymes intended.
Secondly,

Hi, Long time stalker of the SAU forums. Not a very often poster.
Here is my situation,

Recently (3 months ago) i had purchased privately a beautiful 1998 R34 Gt-t

The more i look at the car the more i tend to notice, These arent negative things. Just id like to further my knowledge and get some insight to whats happening.

As it is now (as far as i know is fairly stock. The only real modifications ive come across are as follows.

-Greks oil filter relocation
-Splitfire coilpacks

-Hks Coilovers

-Power steering fluid relocation

-3.5" Exhaust

-R34 MFD
-Aftermarket Oil Cooler. (Im guessing aftermarket as i dont think nissan uses bright blue coloured piping around the cooler)
-1.5 way diff locker

Now onto the real questioning. Looking through my engine bay one day i noticed on the right hand side, a valve or solenoid looking setup with two hose ports. These two hose ports not being attatched to anything led me to consult the R34 manual. Subsequently ive found that its the turbo pressure solenoid valve. According to the r34 MFD installed in the car, at peak ive managed to crank 0.93kg/cm2, now after some googling and a random ass turbo pressure conversion chart the value comes out to 13.3psi.

I then choked on my milo and had a realised maybe thats something to do with this solenoid not being connected.

Ill have some photos uploaded. Any advice or knowledge you can share will be really helpful. And also 13 psi feels like its too much for a stock turbo. Dont really wanna blow anything

Thanks in advance

[Badgaz]

looking at that...it looks like at some point an aftermarket boost controller has been fitted....see those small blue hoses....they aren't standard...have a look around for a boost controller solenoid with a hose connected to it...i'll look similar to the stock one...or it might just be a air bleed valve.

Edited September 27, 2014 by Badgaz

[GTSBoy]

Yes that's the stock boost control solenoid.

No it's not too much for the stock turbo - although there is some risk that it might die at that boost level.

Yes, it is too much boost for the stock ECU and it must run like a dog if it hasn't had something done (Nistune, other ECU transplant) to make it happier.

Look for hoses running too/from the wastegate actuator and the turbo compressor housing/outlet/intercooler pipe to see what sort of boost controller has been installed in place of the stocker.

Edited September 27, 2014 by GTSBoy

[MickEdge]

Okay sweet, thanks guys.

and well when i had bought the car it would misfire coming onto boost or any load. Since that i changed the coilpacks and plugs and shes running like a dream.
I bought an OBI Port and got nissan datascan out and running on the laptop. It qued up to the computer so that leads me to assume its a stock ECU. Otherwise it wouldnt reference the laptop/program.

ill follow what yous said. see what i can find.

thanks heaps for the help, anything else you can come up with would be extremely appreciated. cheers

[Badgaz]

does it have a FMIC? or the standard side mount intercooler?

[MickEdge]

Negative, no front mount intercooler in this case. So yeah itd have to be the stock side mount. Excuse my lack of knowledge, but that stock side mount intercooler. Whereabouts is he hiding in the engine bay?.

The last 3 months have been the biggest learning curve for me haha.

Though on the other hand this weekend I didnt have time to look around for anything you guys suggested but as soon as I do ill be right back on here

[GTSBoy]

Sidemount lives inside the passenger side guard - in front of wheel.

It is too small to run raised boost through too. No more than maybe 10 psi recommended. GTT ECUs don't really like much more than 12 psi anyway, so you really need to do something about getting the boost back under control.

[KiwiRS4T]

You could have a Nistune chip in your ECU or some kind of mickey mouse boost cut defender or such like. Post up your location and try to meet some fellow skyline owners for a chat and to compare notes.

[MickEdge]

Yeah definitely need to sort this out. Thanks heaps guys.

Im around Revesby area. Ill be handy with a case of beers if someone with a bit more knowledge than i could assist in finding out what the goes is!
Nevertheless its heading over to tunehouse for a dyno run in about two weeks. Guess i could ask them to look over the car.

The car coming from japan means its a mystery, I wonder if the auction papers could show a bit more information. Good thing i cant read japanese hahaha (buggered if id know how to get this translated).

all in all i just want to know exactly whats in the car so eventually i can choose to f**k it off or build off it !

[GH05T]

yeah a nistune or the likes will still let the original ecu talk to laptop. will look like a stock ecu until you open it up.

[Joshbigt62r]

R34 side mount cooler is fine for power up to about 200-220kw. But thats at its limits and not really recommended.

[Dylan454]

Just randomly came across this lol, I have a r32 gtst and the boost is at 11 psi as far as I know the ecu is stock. Does to much boost really cause your car to run crap because mine idles really bad.

[Ben C34]

Just randomly came across this lol, I have a r32 gtst and the boost is at 11 psi as far as I know the ecu is stock. Does to much boost really cause your car to run crap because mine idles really bad.

Running higher boost won't make your car idle bad. Unless it has fouled the plugs from running rich or damaged the engine. 11 psi on a 32 ecu wouldn't do that.

[Blackkers]

Just randomly came across this lol, I have a r32 gtst and the boost is at 11 psi as far as I know the ecu is stock. Does to much boost really cause your car to run crap because mine idles really bad.

When you say bad what do you mean? Hunting? stalling? popping/farting? high idle? hard to say without more info but we might be able to help

[MickEdge]

ECU Is in the passenger footwell yes?

[Ben C34]

ECU Is in the passenger footwell yes?

Should be.

[GTSBoy]

Mine was in the footwell for about 6 months after the engine transplant, but then I put it behind the passenger's kick panel, like it's supposed to be.

[Ben C34]

Footwell area.

[Dylan454]

When my car Is idling it sounds like it misses for a second like a very slight drop in revs, I have cleaned the AAC valve but it didn't help.

[Badgaz]

Check for vacuum leaks