fresh 60e and ss3600 coasting shudder
10-18-2012, 08:13 PM
#1
TECH Enthusiast
Thread Starter
iTrader: (1)
Join Date: Jul 2010
Location: CroSSby, TexaSS
Posts: 554
Likes: 0
Received 0 Likes
on
0 Posts
fresh 60e and ss3600 coasting shudder new engine/tranny build so i have NOT gotten on the gas or flashed the converter, converter locks up accordingly BUT my problem is that it's bucking or "shuddering" while coasting around 35-50mph
any ideas on where to start looking guys?
any ideas on where to start looking guys?
10-20-2012, 03:45 PM
#2
Moderator
I tuned my SS3600 not to lock up until 50mph and even then my engine is bucking a bit because it is turning only 1500 rpm and I have a 231/237 cam. I even run open-loop and run a 13.5 A/F ratio at light load to reduce surging.
I don't see a hot cam in your signature, so perhaps that is not it.
I don't see a hot cam in your signature, so perhaps that is not it.
10-21-2012, 12:20 AM
#3
TECH Enthusiast
Thread Starter
iTrader: (1)
Join Date: Jul 2010
Location: CroSSby, TexaSS
Posts: 554
Likes: 0
Received 0 Likes
on
0 Posts
I tuned my SS3600 not to lock up until 50mph and even then my engine is bucking a bit because it is turning only 1500 rpm and I have a 231/237 cam. I even run open-loop and run a 13.5 A/F ratio at light load to reduce surging.
I don't see a hot cam in your signature, so perhaps that is not it.
I don't see a hot cam in your signature, so perhaps that is not it.
10-21-2012, 09:40 AM
#4
Moderator
You might want to repost in the engine section, but I am confident it is not a trans problem. I've had the same bucking with three different transmissions and three different torque converter and after various attempts to "tune" it out on the engine. IMO it is a side-effect of a performance cam.
This assumes of course that we are experiencing the same thing.
This assumes of course that we are experiencing the same thing.
11-26-2012, 04:00 PM
#5
TECH Enthusiast
Thread Starter
iTrader: (1)
Join Date: Jul 2010
Location: CroSSby, TexaSS
Posts: 554
Likes: 0
Received 0 Likes
on
0 Posts
You might want to repost in the engine section, but I am confident it is not a trans problem. I've had the same bucking with three different transmissions and three different torque converter and after various attempts to "tune" it out on the engine. IMO it is a side-effect of a performance cam.
This assumes of course that we are experiencing the same thing.
This assumes of course that we are experiencing the same thing.
11-26-2012, 04:14 PM
#6
Moderator
Glad it helped; I thought it would.
I also have a 231/238 cam now (with wider LSA than a month ago); I raised my lockup speed further to 54mph and the bucking is almost completely gone.
I also have a 231/238 cam now (with wider LSA than a month ago); I raised my lockup speed further to 54mph and the bucking is almost completely gone.
Trending Topics
11-27-2012, 07:50 AM
#8
Moderator
No, I now have a Comp 54-458-11 LSR Cam with 231/239 duration, .617/.624 lift and 113 LSA. Previously I had a custom Patrick D cam with similar duration/lift and 111 LSA. The additional LSA in the new cam actually cuts the overlap in half, giving a better low end but some loss at the very high end. Both gave me fastest track times with 7000 rpm shifts.
Neither likes to run much below 2000 rpm; hence the need for a high lockup speed.
Neither likes to run much below 2000 rpm; hence the need for a high lockup speed.
11-27-2012, 08:21 AM
#9
TECH Enthusiast
Thread Starter
iTrader: (1)
Join Date: Jul 2010
Location: CroSSby, TexaSS
Posts: 554
Likes: 0
Received 0 Likes
on
0 Posts
Ah gotcha. I'm running a similar cam that also happens to be one of the hardest pulling cams I've ever used in any ls. Strong lowend and midrange
