Fresh Air Inspector
Member
- Joined
- Nov 4, 2018
- Location
- LaHave, Nova Scotia, Canada
Hello All,
I need some feedback on how people are mounting / hanging their modified exhaust systems?
My 1994 940T wagon has some minor modifications; IPD Turbo cam, chipped ECU, chipped ICU, manual boost controller, larger injectors and a 3" downpipe / cat with a 2.5" pipe to a single Magnaflow straight through muffler (#11216), just before the rear bumper.
The 3" pipe is wrapped with fibreglass tape from the turbo to the cat. I've used the original turbo downpipe clamping point (bell housing bolt), for a metal band wrapped around the fibreglass pipe wrap. Next I modified the original mount from an AW71L automatic to fit the O/D housing on the M46 gearbox (I swapped out the AW71L for the M46 with O/D). Again, I used a metal band wrapped around the fibreglass tape. This mount is about 12" further back than the original location with the AW71L. From the cat to the rear bumper the exhaust system uses the original 'rubber' hangers.
My logic for the above set-up is to ensure the downpipe is held very tight to prevent vibrations from stressing the exhaust manifold, turbo and all the mounting studs. But allow the remainder of the exhaust system (cat to rear bumper), to move around on the rubber mounts.
I have a slight 'buzz' between about 1800 and 2200 RPM that I'm certain is the exhaust system. It will even create a very slight buzz in the instrument cluster during part of this rpm range.
So, I'm open to suggestions as to what changes I should be making?
Looking forward to your feedback.
I need some feedback on how people are mounting / hanging their modified exhaust systems?
My 1994 940T wagon has some minor modifications; IPD Turbo cam, chipped ECU, chipped ICU, manual boost controller, larger injectors and a 3" downpipe / cat with a 2.5" pipe to a single Magnaflow straight through muffler (#11216), just before the rear bumper.
The 3" pipe is wrapped with fibreglass tape from the turbo to the cat. I've used the original turbo downpipe clamping point (bell housing bolt), for a metal band wrapped around the fibreglass pipe wrap. Next I modified the original mount from an AW71L automatic to fit the O/D housing on the M46 gearbox (I swapped out the AW71L for the M46 with O/D). Again, I used a metal band wrapped around the fibreglass tape. This mount is about 12" further back than the original location with the AW71L. From the cat to the rear bumper the exhaust system uses the original 'rubber' hangers.
My logic for the above set-up is to ensure the downpipe is held very tight to prevent vibrations from stressing the exhaust manifold, turbo and all the mounting studs. But allow the remainder of the exhaust system (cat to rear bumper), to move around on the rubber mounts.
I have a slight 'buzz' between about 1800 and 2200 RPM that I'm certain is the exhaust system. It will even create a very slight buzz in the instrument cluster during part of this rpm range.
So, I'm open to suggestions as to what changes I should be making?
Looking forward to your feedback.