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#1
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Exhaust flex joints
If you remove the flex joint in front of the center cat, is it a good idea to offer some flexibility elsewhere? I replaced my center cat with an aftermarket cat and I am getting a resonant buzz between 3000 and 3500 rpm. Could the lack of flexibility be contributing? I was thinking of using those braided stainless flex couplers in front. Any thoughts?
Stephen
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92 Ebony - Level 10/n2o REAR-ENDED 92 Teal - painted yellow/4.11 5spd/n2o SOLD 92 Claret - 4.44 SOLD 94 Barcelona - FWD SOLD 92 Ebony - 3.90 SOLD 94 Laguna ROLLING w/4.44s/Ecutune ECU +TCU/STI springs/Infiniti M45 rims |
#2
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When I built my first exaust I didn't have any flex points in it and I didn't have any problems. However it would seam that after a wile of working it, it would fatige the metal and break somewhere. If you have an easy place to install a flex joint then you should do it althoe I don't think it has any thing to do with your noise.
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92 SVX #772 140k 6speed, ECU Tune stage II, Koni/Ground control, 3,270lbs. 91 Legacy Turbo 5spd. FMIC, crappy stock turbo, ACT clutch. 78 BRAT (New toy) (Soon to be EJ22T powered) 90 240 SX. RB25 powered!! DRIFT!!!111!!! (GF's car) To many cars to spend time on teh web! |
#3
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Have you tracked down the source of the noise? My guess would be that its the heat shielding around the primary exhaust pipes. Maybe just a little readjustment of the heat shielding would be necessary?
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads. |
#4
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Actually the car contains no heat shields, other than the integral one on the new center cat. Which is probably the culprit. It has straight pipes from the manifolds back to the center cat. It really sounds great, except for that dang buzz.
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92 Ebony - Level 10/n2o REAR-ENDED 92 Teal - painted yellow/4.11 5spd/n2o SOLD 92 Claret - 4.44 SOLD 94 Barcelona - FWD SOLD 92 Ebony - 3.90 SOLD 94 Laguna ROLLING w/4.44s/Ecutune ECU +TCU/STI springs/Infiniti M45 rims |
#5
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That darn cat
Actually, I should say that I do have the heat shields on the manifolds. Anyway, the new cat had a few spot welds that let go so I welded it all the way around the perimeter and now most of the noise is gone. I may end up just removing the heat shield altogether if it keeps bugging me, which it probably will.
Stephen
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92 Ebony - Level 10/n2o REAR-ENDED 92 Teal - painted yellow/4.11 5spd/n2o SOLD 92 Claret - 4.44 SOLD 94 Barcelona - FWD SOLD 92 Ebony - 3.90 SOLD 94 Laguna ROLLING w/4.44s/Ecutune ECU +TCU/STI springs/Infiniti M45 rims |
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