R33 Gtst Possible Fuel Problem?

[Stoychevski]

Hi there first time post.

TL;DR Everything works good, specialist said that not enough fuel going into engine during spool/boost, is it common problem/suggested fix?

I currently have just bought an R33 GTST 1994 Skyline. And it drives great, I took it to a few mechanics and all have said its very very clean. It's only done 94000kms. One mechanic said he suggested new spark plugs and a 2 rocket gasket covers. So I got those done, only about 400 for the lot with labour. But I keep feeling there is power loss, I tried to explain to the mechanic but he said it was just me.

What I explained was that it felt like I could hear the turbo spool, but there was no power, for some reason it just felt like it was taking years for it go from 3000rpm to 6500rpm (7000 is my redline). Just felt slow. Mechanic said I was just thinking things. At first I thought it was boost leak, but he checked all hoses and piping, no leaks, the boost gauge also registers perfect as it should, all the way upto 11psi no jumping or anything.

The car has no misfire or idle problems. But recently a "specialist" who has owned one said that I was indeed right, there was something wrong with it. He said that he thinks up until 3000rpm, til before the turbo spools it drives good, but after that he thinks there isnt enough fuel going through, he said he checked my fuel pump and it was working, there just wasn't any flow. He also mentioned and i have seen this before, usually when similar skylines put the foot down you see more black smoke come out the exhaust because of the higher fuel flow, but mine doesn't get anymore smoke come out. So he suggested I might need to check my fuel pressure at the front where my engine is, get a tune, and possibly might need a new ECU.

The car has an aftermarket exhaust, just a hi-flow, not very big mufflers, I didn't put it in so I'm not quite sure 100% what brand or size it is. But it has an electronic valve controller as well, I don't know how to use it, it has a lot of possible settings, and was also curious if anyone knew anything about it? Could it control my fuel flow? here is some pictures of it, and all its settings - http://imgur.com/a/YsAwf is while the car is idling, and just pushing PWR to turn it on, and then mode to go through the set settings).

And also my HICAS light is on, but god knows what that could be.

Is there a way I can fix this without making it cost $3000+? Or is my mechanic wrong and should I look for/ask for something else? Maybe I should take it to a tune shop and get a second opinion.

Edited April 19, 2015 by Stoychevski

[dermy]

Sounds like its rich and retarding to me try lowering boost to 9-10 psi

[Stoychevski]

Sounds like its rich and retarding to me try lowering boost to 9-10 psi

Thanks, I'll give it a go.

Edited April 19, 2015 by Stoychevski

[Ben C34]

Its interesting you believe the car has actually only down that many ks.

Its odd to replace rocker gaskets at less than 100_000.

That specialist sounds special.

Go somewhere who knows what they are doing.

[breaker1845]

Welcome to the forums. Be prepared to read and search for ideas on the problem, lol.

Secondly get a second opinion or many more as you don't want to be spending heaps of cash on parts that aren't broken.

Most gtst's are definitely old (probably closer to 200,000km traveled) and run like dog shit so working out what the issue is could take time, be prepared for that.

[75coupe]

One mechanic said he suggested new spark plugs and a 2 rocket gasket covers. So I got those done, only about 400 for the lot with labour.

Find a new mechanic i thinks

[Dose Pipe Sutututu]

FYI, add another 100000 or 200000 to your odometer.

My car says 146xxx judging from the amount of parts I have had to replace it's seriously got a decent 346xxx kms. A good give away for age are the castor rod bushes and all four tie rods/tie rod ends.

I bet they're loose as a hoe lol