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lilcrash

By lilcrash,
in Engines & Forced Induction

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lilcrash Veteran

lilcrash

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I think you miss understood what I was saying, I purchase my car 5years ago in stock form, there has been nothing but problems since. I don't think there is many stock parts left to replace.

TTT Grand Master

TTT

Posted
Posted

WARNING - CSH about to begin.

There is a guy on another forum.

He has an R31 GTSX.

He has millions of spares including 2 x GTSR manifolds.

Anyway..

he had this issue with a missfire.

he replaced the coils, spark plugs, vacuum lines, fuel pump, injector seals, filters etc etc.

spent months

Then went to try a different ECU.

The ECU he tried didn't work

Plugged his old ECU back in.

On the drive home, car worked like it was from the showroom.

Basically, he had dust or some sort of crap in either the loom plug or ECU plug.

the removal of the ecu, then plugging in another then the original cleaned the pin enough for it to stop f**king up.

point of my story is it could be something very simple giving you your head aches.

something you haven't touched.

Engine has been rebuilt.

can't be that (well unlikely)

What has not been changed?

Did you get new silicon hoses for the intercooler?

have you made a simple tester to find any air leaks (mountain bike tube, hand pump and 10 minutes of your time can do this)

what is the ECU? have you cleaned the connectors with electrical contact cleaner?

AFM? (cleaned? resoldered? tried a known working one?)

coil packs?

fuel filter?

fuel pump rewired to get full voltage full time?

air intake sucking closed?

oxygen sensor f**ked?

Cat convertor functional? (remove cat and cat back and test drive (bit loud))

to be honest I can't remember what you have and haven't tried cause it's been going for so long now.

lilcrash Veteran

lilcrash

Posted
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All I have replaced about half of my joins, I'm in the process of doing the rest just ran out of hose.

Yeah I made a tester at work with a built in guage.

Nistune. Il clean them when I get a spare couple of minutes.

Brand new z32 afm

Splitfires

New filter

Walbro hard wired

3inch steel intake with an apexi pod

I think I might try the o2 sensor next

It's a gutted cat. But as said earlier it's got a hks cat back so it is restrictive.

Hanaldo Grand Master

Hanaldo

Posted
Posted

I think the exhaust is just masking the real problem, you shouldn't be having boost control issues just because you have a free-flowing exhaust. The surge issue is different though, have you checked where your TP cut has been set to?

hypergear Grand Master

hypergear

Posted
Posted

The boost issue was from exhaust restriction, what else or other mufflers do you have in the exhaust pipe? have you ever tried a dyno run with the exhaust dropped off before the cat? if you are making 230rwkws now on 14psi then I don't think you should have an issue doing 250rwkws at 18psi.

Running rough with black smoke and flooded spark plugs is not a definition for compressor surging. its got some thing to do with injection, AFM and ignition. Its freaks me out as you can give any thing that goes wrong with you car a name that links to the turbocharger.

I have a Nistune license, I can't give to you but if you wish to send me your tune file and tell me the part of the data you wish to change, then I can have that changed for you and return the updated file. How ever I'm not responsible if what ever I've asked to change makes the situation worse.

lilcrash Veteran

lilcrash

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Stao - sorry if you miss understood, I'm not saying it's turbo related. The boost is sitting very stable at 14/15psi constantly, the car just feels like it pulls then doesn't then pulls again. As if I'm opening and closing the throttle. It's a really strange feeling, but now that I think about it it's only been since I installed the front shaft, I will do the diagnostic to turn off the 4wd and see if it still does it, maybe there is just too much driveline for my tune to handle. It's very hard to diagnose a particular issue when you have 2 other problems at the same time.

lilcrash Veteran

lilcrash

Posted
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Yeah I've been keeping my eye out for something but I've also gotta have the cash for tyres, as said above I'm due for a new set anyway. I'm almost tempted to just find a brand new set, like all I need is a cheap rim/tyre combo in a 17x8 +6 or 17x9 +30. It's a pretty common size.

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