Exhaust Woes

[GH05T]

ok so my rb20det in my 32 has always had a hickup on idle, never been an issue but always kinda been chasing it down.

anyway with my head under the bonnet the other day i heard the distinct fluttering sound of exhaust leek,

i have also never liken my screamer pipe/ waste pipe whatever its called when its plumped in.

the screamer in blue is slid into the turbo and is wealded to the dump at the bottom in red.

the dump pipe fits well as its flanged properly but the screamer is just slid/ shoved into the wastegate hole, most people i speak to say thats just how it goes.

my first question - is their a better way to have this fitted seeing as their no bolt holes to have something matched up properly

my other option seems to have a slightly longer pipe so it slides in further and get something reeeealy snug fitting??

not really happy with the setup but i have been told im being picky.

this is where the exhaust leak seems to be coming from, the little hole on the turbo has air puffing out and from the pipe/ turbo join itself right where the turbo meets the wastegate exit.

it has also occurred to me that the wastegate is letting air out on idle. also my o2 plug which i assume is in yellow, became unconnected....this did f**k all to the running of the engine......probably not cool...what issues am i actually looking at here

and i guess to answer my other....first question, is this all making my coughing idle?

this is my turbo set up with some helpful colours to explain my ramblings

[kitto]

Whack looking waste gate setup.

But i'm sure you already had another thread and asked all these questions before.

Simple answer, get someone who knows how to make up an exhaust, make you a new dump pipe.

Get him to weld a small section pipe directly to the waste gate with a v band flange on it. Then another v band flanged bit of pipe for the actual waste gate pipe. Then plumb it back into the dump pipe down stream or atmo vent it, What ever you want to do.

Go to AM performance, he's in the North as you are AFAIK. Expensive but good work. You'll be happy.

ECU only looks at the 02 sensor under cruise and light load conditions so you wouldn't have even noticed it being disconnected. Maybe excess in fuel consumption. But chances are the 02 is knackered anyway.

No offense, but you appear to create thread after thread about why your car doesn't idle correctly / miss fires. But have you actually done any of whats been suggested? Like changing your coil packs, igniter, coil pack loom, cleaned the AFM, checked for vac leaks, made sure the AAC valve is functioning correctly etc etc.

[GH05T]

thanks for the advise,

i have so far swapped out coilpacks/ and ignitor

had the aac valve cleaned

afm cleaned

replaced most vac hoses

i have had the screamer plumbed back in by a reputable shop but obviously needs more work.

no offence taken but i have had a thread about a year ago discussing taking things back to stock i.e. bov and screamer

and a rough idle fouling plugs which was fixed.

will hit up am tomorow

[kitto]

Have you got Nistune? Have you had it tuned since you got the car? If not at least checked base ignition timing?

Injectors may need to be pulled out and cleaned.

Air regulator might be faulty.

How much money you wanna spend at the end of the day.

[GH05T]

well like i said, its never been a big issue and always on the list to check this and that, recently i have noticed the exhaust leak which has gottn worse and i have never liked the wastegate setup, which again has always done its job.

will sooner or later get a 25 poped in it but it is my daily so i dont mind spending some money here and their on obvious faults.

i dont know how much of an impact it has been making and didnt know if their is an easy way to redesign the pipe flange situation. especially when i keep getting told its a perfectly normal seup, just seems badly done to me.

[kitto]

it will have pretty much no impact to how the car runs. Certainly not idle.

If you had an exhaust leak from the head to manifold or turbo flange gasket then yes, it would have an affect.

You said you putting a 25 in it. If you are, stop spending money on this 20 now. No point in wasting more money on this engine when you won't be able to transfer a lot of the cost over to the new engine.

Have you got Nistune at all? If you dont, dont bother buying it now. Wait until you have a 25.

I wouldn't even bother repairing that exhaust setup now. Unless you plan to keep that turbo with the 25.

[GH05T]

Yeah got a nistune, it will have a 25 put in when it's decommissioned for a while, intend to do as much as I can with mates, for now it's daily dutys, and the engine will then be used for a different car. Also don't currently have 5k but I do have a couple of hundred to fix up little things.

[Moodles2]

Any oxygen sensor (wideband or narrowband) needs to be powered (heated) to burn off any crap, by having it disconnected, it is most likely rooted by now.

[GH05T]

I recon it was only disconnected for 24 hours

[kitto]

I recon it was only disconnected for 24 hours

It was probably dead anyway.

They are a serviceable part and need to be replaced.

[GH05T]

will replace, i do %50 cruzing 80-110kmph

[Odium]

will replace, i do %50 cruzing 80-110kmph

Good move, they're only really used on cruise and your fuel consumption will be horrid without one that is functioning correctly