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Username Post: trans vacuum modulator        (Topic#375804)
995jim 
"7th Year" Silver Supporting Member
Posts: 949
995jim
Loc: Ohio
Reg: 12-17-06
10-06-24 04:13 PM - Post#2874464    

hi, looking for help from people with blown motors. Im currently pulling my trans modulator vacuum from a port at the bottom of the carb on my blown engine. The only other option I see is an 1/8" tapped port on the back of the blower intake which im sending to the 6btm unit. Do i leave it where its at or is it better on the downstream side of the blower at the 1/8" tapped port
thanks jim

Jim

65' Impala SS, 65' Belair, 89' Silverado Z71, 95' Silverado Z71, 12' Silverado, 15' Silverado LTZ, 16' Tahoe LTZ


 


Rick_L 
Member #409
Posts: 28124
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
10-06-24 05:58 PM - Post#2874467    
    In response to 995jim

You need “manifold vacuum”. Connecting at the base of the carb should accomplish that. Put a vacuum gauge on the port to be sure.



 
Shepherd 
Valued Contributor
Posts: 3563

Loc: Lake George, NY
Reg: 11-11-15
10-06-24 05:59 PM - Post#2874468    
    In response to 995jim

The operating range of normal modulator is 0 to manifold vacuum, find a source in that range. Some performance modulators are adjustable to fine tune transmission shifts to the engine's performance characteristics.



 


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