My 88 760 t-wagon seems to growl on the highway like it has a droning glasspack or something. My mechanic tells me turbos are loud. I bought a 240 for work, its so nice and quiet, a peaceful car to drive.

Around 35 or 40 it's OK, on the highway at 65-70 it seems to have a rough, growling, performance car noise. I wish I could quiet the thing. Is this the nature of that turbo unit pushing gas through the pipes, all exhaust is stock.

88 760 T-Wagon 92K 89 240 112K

I heard a similar sound at that speed on my '89 while driving home after I bought it.

Answers to my post were that is is likely a leaking exhaust gasket between the exhaust manifold and the turbo.

Because I am presently reconditiong the car, this could not be confirmed.
--
1989 740Ti 1986 240DL 1984 244GL

check transmission and engine mounts as well as any leaks in your exhaust in the rear, or lose hangers. sometimes an exhaust will just resonate at a certain frequency generated by driving at a certain speed.
--
Kenric Tam
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'

My 760 isn't noisy at all. I've never heard a sound out of it that comes even close to sounding like glass packs. Does the turbo feel like its producing power ? It seems to me that if the turbo produces any sounds it either a whistle or a air-sucking sound. What part of the car is the sound coming from ? front? rear ?
--
1988 760Tic - 153,000, 1966 M-B 230 sedan - 98,000

hey anyone with a 760 do you guys know anything about lowering a volvo that has the self leveling nivomats?

I would post this in the main 700 forum for more responses. I don't have any idea how you would do this.. but it probably could be done. I think for starters you would have to get rid of the nivomats and convert your rear end to use conventional volvo shocks. IPD may or may not sell lowering springs ??
--
1988 760Tic - 153,000, 1966 M-B 230 sedan - 98,000

no my 1990 760 turbo isnt loud at all, maybe something with bad tires i would guess, they do strange things.

It's your motor mounts. If they are the original mounts they've collapsed and hardened,the whole car will rumble and resonate,especially over 50 mph. It should feel like your 240.