Your donations help keep this valuable resource free and growing. Thank you.
|
Vacuum Canister |
Post Reply | Page <12 |
Author | |
george w
Supporter of TheAMCForum Joined: Jan/27/2013 Location: New Jersey Status: Offline Points: 2899 |
Post Options
Thanks(1)
|
The upshift ( and closed throttle downshift)points and control pressures vary inversely with manifold vacuum. The vac.modulator needs to track the engine vacuum accurately and in real time. A canister would not be a good idea as it would likely cause early shifts and low line pressures with attendant slippage. Since the modulator is adjustable I would go that route first by backing the set screw adjustment out. The adjustment is rather fine so you may need to back out the screw more than several turns. When you're at or near the proper modulator setting the transmission should upshift at WOT at just under or at 5000 rpm. if the transmisson internals are stock. Modulator pressure is put against governer pressure to effect a shift. When governer pressure exceeds modulator pressure the transmission upshifts.
Sor of vice-versa on a closed throttle downshift. |
|
Long time AMC fan. Ambassador 343, AMX 390, Hornet 360, Spirit 304 and Javelin 390. All but javelin bought new.
|
|
nitrousamcrambler
AMC Apprentice Joined: Sep/28/2014 Location: South Chicago Status: Offline Points: 49 |
Post Options
Thanks(1)
|
yea in my opinion it just sounds like the Modulator just needs to be fine tune. Also double check the lines and vacuum hose to the modulator one that has the smallest leak will give you issues, second make sure you source of vacuum is a consistent vacuum port causing it to pull vac all the time and not a time port of vacuum
|
|
e_thomp
AMC Apprentice Joined: Oct/28/2012 Location: Ga. Status: Offline Points: 65 |
Post Options
Thanks(0)
|
Thanks for the help everyone. I am getting my vacuum straight from the intake. It has a stainless line and I do not see any cracks or defects. I will check the pressure on that line. If that looks good, I will try adjusting the modulator.
Thanks Again.... Great people here on the AMC Forum. |
|
Eric
|
|
Post Reply | Page <12 |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |