Removing Exhaust from Turbo: How to Remove Nuts? - Page 2

spoke · 03-12-2022, 06:45 PM

Quote:

Originally Posted by Speedy Squirrel

I took this to mean removing the catalyst/muffler from the turbo itself......The turbo studs are A286 high temperature stainless steel, and the nuts are copper plated steel. All are available from Pelican.

Yes, removing the cat from the turbo to put an aftermarket muffler on it. I'm only doing this to install an AFR sensor to monitor the fuel mixture. No room to do it after the turbo with the OEM cat and muffler.

Alan L · Alan L's Garage

If you want more room, then you could remove the whole turbo assembly complete. That will give you better access to the 4 studs. You may end up removing the IC as well, but no biggie. 4 nuts/bolts on base of turbo, oil pipe connection at base of turbo and oil collector below turbo, and an up pipe connection somewhere. Muffler straps, and should drop out with luck. maybe need to remove rear bumper as already mentioned.
Alan

DaytonaCoupe66 · 03-13-2022, 04:28 AM

Quote:

Originally Posted by spoke

Yes, removing the cat from the turbo to put an aftermarket muffler on it. I'm only doing this to install an AFR sensor to monitor the fuel mixture. No room to do it after the turbo with the OEM cat and muffler.

I recently removed the exhaust nuts where it meets the turbo flange, including the studs as one came out with the nut, and another stud had previously been cross threaded. The studs were rusty so were not stainless on mine. There's very little room to turn a wrench. Soaking the assembly with PB blaster over several days helped. So did attacking the job over several sessions...slow and steady. Similar process to remove the wastegate. I had to mig weld bolts onto two studs to get them to turn on account of threads that had seen better days. Take your time.

Ron84SlantNose · Ron84SlantNose's Garage

spoke, is your stock exhaust available that you're taking off? I am looking for a factory exhaust for that year. Please PM me.

Best regards,
Ron

boosted79 · 04-02-2022, 04:49 AM

Belmetric.com is your friend. They have copper coated exhaust lock nuts and any metric fastener you'll ever need.

spoke · 04-02-2022, 07:00 AM

Quote:

Originally Posted by Ron84SlantNose

spoke, is your stock exhaust available that you're taking off? I am looking for a factory exhaust for that year. Please PM me.

Best regards,
Ron

Ron,

I'm changing the exhaust only to add an AFR sensor to tune the engine. Once tuned, I may replace the OEM exhaust.

spoke · 05-30-2022, 06:59 PM

I'm finally getting around to removing the exhaust. Question is how do I remove the bumper? I see a clamp on both sides to hold the buffer piston but I can only see the inside bolt. Do I need to take off other panels to get to the bumper bolts?

DaytonaCoupe66 · 03:17 AM

Quote:

Originally Posted by spoke

I'm finally getting around to removing the exhaust. Question is how do I remove the bumper? I see a clamp on both sides to hold the buffer piston but I can only see the inside bolt. Do I need to take off other panels to get to the bumper bolts?

Have you removed the bumperettes? I believe your 'nuts' that attach the rear bumper to the mounts are under there.

Edit: I checked; oops. Nuts are under the trim pieces that travel from the outside of the bumperette edges around the side to the bumper.

donbecker1234 · 05-31-2022, 04:20 AM

Quote:

Originally Posted by spoke

I'm finally getting around to removing the exhaust. Question is how do I remove the bumper? I see a clamp on both sides to hold the buffer piston but I can only see the inside bolt. Do I need to take off other panels to get to the bumper bolts?

I'm not sure if Cat + Muffler is any different, but on my 930 w/muffler (no cat) I can take off/on the 4 nuts holding it directly to the turbo without removing the bumper.

I use a combination of short open ended wrench and 1/8" drive thin sockets.

Replace with copper coated nuts and use nickel high temp anti-sieze.

spoke · 06-01-2022, 07:59 AM

Quote:

Originally Posted by boosted79

Belmetric.com is your friend. They have copper coated exhaust lock nuts and any metric fastener you'll ever need.

What size are the turbo bolts? Need to get those.

spoke · 06-01-2022, 03:06 PM

OK, the bumper is off and I'm wondering if I can add the O2 bung right on the Cat. Has anyone mounted an O2 bung in this place? It looks like it should fit.

spoke · 06-01-2022, 03:31 PM

I'm installing an AEM 30-4110 sensor and it says:

'If you anticipate high EGT's (over 800C), run a turbo, ... you must mount the sensor 36 inches downstream as all of these can cause the sensor to overheat. ... For accurate readings, the sensor must be mounted before the CAT...'

So it seems I can't mount the bung where I have it shown. The exhaust system isn't even 36 inches long to mount it away from the turbo.

Bucketlist · Bucketlist's Garage

With a 930 the usual installation of the wideband 02 sensor should be as close to the turbo outlet as possible. There are probably some threads relating to this.
Mine is right about there and I have never burned one up.

DaytonaCoupe66 · 06-02-2022, 02:55 AM

Quote:

Originally Posted by spoke

I'm installing an AEM 30-4110 sensor and it says:

'If you anticipate high EGT's (over 800C), run a turbo, ... you must mount the sensor 36 inches downstream as all of these can cause the sensor to overheat. ... For accurate readings, the sensor must be mounted before the CAT...'

So it seems I can't mount the bung where I have it shown. The exhaust system isn't even 36 inches long to mount it away from the turbo.

The Rarly8t exhaust that I recently installed doesn't have much real estate before the muffler for a sensor bung, so no option but very close to the turbo. Brian sells a lot of nicely fabricated exhaust pieces and the reviews are excellent. I trust that this will be fine for street use.

spoke · 06-02-2022, 05:43 AM

Thanks for the replies. I feel a little bit better about mounting the bung so close to the turbo. Question now is can I weld the bung onto the cat? What material is the cat case? Not sure if it's steel or stainless. Has anyone done this before on the cat?

krasuskyp · 06-02-2022, 05:57 PM

I've not seen that done but 3rd'ing your locale choice is correct, along with your 2:00 orientation as shown in yer pic

I gotta believe the cat is stainless

good move regardless installing wb02, imperative on these

spoke · 09-24-2022, 01:57 PM

Finally got the 02 bung installed and all wired up. Because the bung angle takes the top of the bung close to the bumper, I added a protection stud to keep the bumper from hitting the bung during bumper installation/removal. The stud is just a 1/2 bolt welded to the outside of the cat.

Everything was welded using stainless welding wire. All went well except for the protection stud. The shielding gas was on but I didn't notice the low pressure side had gone to zero so no shielding gas at first.

spoke · 09-24-2022, 05:44 PM

I needed to make a hanger for the O2 sensor wires so I made a little hanger and used the threaded hole in the middle of the bumper. The hanger keeps the wire from getting close to the cat.

Alan L · Alan L's Garage

That bung is in the right spot. Needs a down angle - to stop condensation on warm up.
And is close to the turbo - more genuine AFRs.
Will work fine. I have not done one Bosch sensor in over decade on the track and extreme EGTs.
Alan