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  #16  
Old 02-18-2005, 08:27 AM
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mbtoloczko mbtoloczko is offline
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My car with the STi Group N motor and tranny mounts also has a very very mild vibration that picks up at 3500 rpm but goes away by 4000 rpm. I always assumed that my motor wasn't in perfect tune, but maybe its a characteristic of the EG33.
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:: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ ::
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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.
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  #17  
Old 02-18-2005, 09:16 AM
DERS
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The vibration in my is very abnormal. At a constant 3500 RPM it vibrates bad enough to make driving it pretty uncomfortable. With the auto in it before, it was extremely smooth, so I know it's not just the harmonics of the engine.
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  #18  
Old 02-18-2005, 09:52 AM
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Your problem sounds like its not a simple harmonics characteristic. Didn't you say that you can even feel it at idle and that it gets progressively stronger through out the entire rpm range?
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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.
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  #19  
Old 02-18-2005, 07:42 PM
DERS
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Yeah, I can feel it at idle, and it never really goes away at any RPM. I'm really thinking that you guys are right about a bad pressure plate or out of balance flywheel.
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  #20  
Old 02-20-2005, 10:16 AM
DERS
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Well, After a new clutch and flywheel, the problem is still there. I did notice that my motor mounts are cracked. I'm starting to think that that is allowing the motor to sit closer to the sub frame, which is causing me to feel vibration inside the car. Anybody know a good source for motor mounts? They were stupid expensive from Subaru.
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  #21  
Old 02-20-2005, 11:24 AM
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Subafreak Subafreak is offline
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Quote:
Originally posted by huck369
All engines have certain harmonics that will be apparent at different RPM levels, the flat 6 is about as close to perfect as they come…but still will produce vibrations, the factory liquid filled mounts really do a good job of hiding them, but with the STi mounts, or even the factory Impreza tranny mount, there are more vibrations transmitted through them since they are denser material,… So are you sure it’s not just normal engine vibrations?

Thats pretty much the conclusion I came to. I figure they put those squishy mounts in there for a reason, and that resone is that most people don't want to feel the car running.

Like I said I never realy felt mine untill after I put in the STI mount.

Also even when using the stock tranny mount in an SVX 5 speed conversion, the tranny is still not as isolated as in a stock 5 speed car. All of the conversion X-members I've seen are not triple rubber mounted like the stock Subaru 5 speed mounts.
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  #22  
Old 02-20-2005, 11:26 AM
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Quote:
Originally posted by DERS
Well, After a new clutch and flywheel, the problem is still there. I did notice that my motor mounts are cracked. I'm starting to think that that is allowing the motor to sit closer to the sub frame, which is causing me to feel vibration inside the car. Anybody know a good source for motor mounts? They were stupid expensive from Subaru.
Yeah, I'm thinking you may have a more serious problem. My vibrations are like the ones mentioned by other members. Yours seem to be excessive.
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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!
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  #23  
Old 02-21-2005, 07:58 AM
DERS
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Well, I'll try replacing the bad motor mounts and go from there. Thanks for your help!
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