Strange rotating sound while driving our 94 - ZR-1 Net Registry Forums

Norwegianmopar · 09-01-2020

We have a strange unknown sound while driving, a slow growl-like rotating sound, we notice it more when two ride in the car than one. It is slower than the speed of the wheels (no brakes hanging) and more noticeable when turning right. It is there both when releasing the throttle and/or pressing the clutch in, both in gears and in neutral. Noone can figure it out.

Could it be the differential? Maybe the transmission? Wheel bearings (not likely)?

It reminds us of the sound tires make when touching the inner fenders, only rotating slower than that and more of a mechanical sound. A low growl/scraping rotating sound (hard to explain in words). A bit of the same frequency or growl type like the transmission in the first gears at low rpm, but an uneven rotating sound...

Brake pads rubbing uneven discs could maybe make the same sound, but then according to wheel speed, not more or less constant like here.

We do have a lightweight flywheel that makes some sound too, but this is a mystery to us.

The car had a full tune up and service at Haibeck's last summer and has ran less than 1000 miles since.

I know it's a long shot tho but have to ask since we have no clue what it can be.

Sent from my SM-G955F using ZR-1 Net Registry mobile app

09-01-2020	#1
Norwegianmopar Join Date: Mar 2018 Location: Norway Posts: 346	Strange rotating sound while driving our 94 We have a strange unknown sound while driving, a slow growl-like rotating sound, we notice it more when two ride in the car than one. It is slower than the speed of the wheels (no brakes hanging) and more noticeable when turning right. It is there both when releasing the throttle and/or pressing the clutch in, both in gears and in neutral. Noone can figure it out. Could it be the differential? Maybe the transmission? Wheel bearings (not likely)? It reminds us of the sound tires make when touching the inner fenders, only rotating slower than that and more of a mechanical sound. A low growl/scraping rotating sound (hard to explain in words). A bit of the same frequency or growl type like the transmission in the first gears at low rpm, but an uneven rotating sound... Brake pads rubbing uneven discs could maybe make the same sound, but then according to wheel speed, not more or less constant like here. We do have a lightweight flywheel that makes some sound too, but this is a mystery to us. The car had a full tune up and service at Haibeck's last summer and has ran less than 1000 miles since. I know it's a long shot tho but have to ask since we have no clue what it can be. Sent from my SM-G955F using ZR-1 Net Registry mobile app __________________ Roy Martin 1994 ZR-1 #112 Admiral Blue/Black Dana 4:10 Aluminum flywheel Corsa exhaust Watson headers Haibeck chip 470 HP/399 RWHP 1991 ZR-1 #400 White/Red (SOLD) Dana 4:10 Powder coated engine Haibeck performance chip Borla exhaust