Cam only surging...big stall effects?
04-25-2007, 10:09 AM
#1
Cam only surging...big stall effects? Car is cam only 98 M6 going TH400 w/ RMVB conversion. Will be 3200 lb raceweight running a 28" tire, 3.42 gear (will be 3.55 eventually, not much diff.) and looking at a 4400 or so stall verter (custom edge verter) with intent to spray 100-150 shot.
If I have mild surging issues at low speeds now, what can I expect with the TH400 and 4400 stall. I understand there is no engine braking on the Th400 because of a removal of the first drum band (or something of that nature). Will I still get the bucking sensation like I do with the M6 setup?
Thanks,
Marty
If I have mild surging issues at low speeds now, what can I expect with the TH400 and 4400 stall. I understand there is no engine braking on the Th400 because of a removal of the first drum band (or something of that nature). Will I still get the bucking sensation like I do with the M6 setup?
Thanks,
Marty
04-25-2007, 06:49 PM
#2
TECH Addict
iTrader: (3)
Join Date: Nov 2005
Location: Lincoln, NE
Posts: 2,869
Likes: 0
Received 0 Likes
on
0 Posts
The converter will likely make your car stall, literally. Mine has a rare chance of doing it to a bone stock motor, if the conditions are right.
Once you get the tuning figured out it will be fine, but after the install it is going to want to die when coming to a stop.
Once you get the tuning figured out it will be fine, but after the install it is going to want to die when coming to a stop.
04-25-2007, 06:54 PM
#3
I would imagine you get less bucking with any stall, it is a looser connection between the tranny and engine (where most of the drivetrain loss for autos comes from), and since your converter wont be a lock-up converter (I'm assuming since you didnt denote that it was a TH400e, sorry I'm not sure what RMVB means) that you wont have to worry about just making sure car locks-up the converter at a high enough speed to stop the bucking.
04-25-2007, 10:30 PM
#5
Moderator
iTrader: (11)
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,605
Likes: 0
Received 6 Likes
on
6 Posts
I think the lighter flywheel mass magnifies surging. What I have
been finding in trying to tune my new cam idle is, you want to
rework the timing table particularly, and probably the fuel as well
to eliminate the MAP axis variation at the low end. This (MAP bump
makes timing drop and fuel richer, making MAP rise more, then
overcorrect the other way, on and on) has to be pounded flat.
Although the timing tables reference dynamic cylinder air this is
MAP, pretty much, until you get to airflow limited.
been finding in trying to tune my new cam idle is, you want to
rework the timing table particularly, and probably the fuel as well
to eliminate the MAP axis variation at the low end. This (MAP bump
makes timing drop and fuel richer, making MAP rise more, then
overcorrect the other way, on and on) has to be pounded flat.
Although the timing tables reference dynamic cylinder air this is
MAP, pretty much, until you get to airflow limited.
