Question about dynoing an automatic transmission
11-17-2013, 01:08 PM
#1
On The Tree
Thread Starter
iTrader: (1)
Join Date: Aug 2009
Location: Indiana
Posts: 140
Likes: 0
Received 0 Likes
on
0 Posts
Question about dynoing an automatic transmission Hey guys, I'm not sure if this is the right forum to post this in or not but here it goes! I have a stock auto with a 3600 stall in my 99 ss. I just got the motor built, and dynoed the car. They only went up to 6,000 rpm because the car was at 139 mph and they said it was vibrating a lot. They didn't go any higher because of the risk of snapping the input shaft. I think some power was left on the table because of that limitation. Is there anything I can do to stop the vibration and possibility of the input shaft snapping? Like a brace or new crossmember? I'd like to get a new dyno tune at max rpm. Thanks!
11-21-2013, 02:47 PM
#5
On The Tree
Thread Starter
iTrader: (1)
Join Date: Aug 2009
Location: Indiana
Posts: 140
Likes: 0
Received 0 Likes
on
0 Posts
I've come down to the assumption that it's the stock mounts. I'm going to get solid motor mounts and a poly trans mount to help stop the vibration. I don't care that the car will vibrate more, I just need the powertrain/driveline vibration gone. The wheels/tires are in balance since they were done recently and I worked at the shop they were done at.
11-21-2013, 02:58 PM
#6
Moderator
IMHO, the proper way to deal with a strong vibration is to find the source of it, not suppress it with solid mounts.
There have been plenty of posts here about driveshafts going out of balance. At those speeds a driveshaft that breaks a u-joint can destroy the car and seriously injure the driver. Hence the use of driveshaft loops.
There have been plenty of posts here about driveshafts going out of balance. At those speeds a driveshaft that breaks a u-joint can destroy the car and seriously injure the driver. Hence the use of driveshaft loops.
