Guybrush
10-08-2008, 12:34
Overview of the cup mod
The cup mod is simply changing the arrangement of the anciallary pipework around the carbarettor and the turbo actuator.
The purpose of the cup mod is to enable the turbo to produce full boost quicker than it does normally.
The name "cup mod" is derived from the "Renault 5 Cup" races back in the 80's, there was a series of modications that would be done to a GTTurbo before racing. This mod was one of them.
How to do it
Start by locating the turbo elbow, on the rear is a metal union connecting to a rubber pipe. Undo the nut and remove this. Put a suitable block into the turbo elbow (a wheel bolt works well)
Follow this pipe to the top of the carb, and remove the associated piperwork from the car.
Remove all of the pipework between the top of the carb and the actuator
Run a single pipe of pipework from the base of the carb to the front port of the actuator
Block the top two carb top ports
Leave the rear actuator port open
Coupe book scans
<a href = "http://www.rtoc.org/articleimages/cupmod.jpg"><img src=http://www.rtoc.org/articleimages/article_tn/cupmod.jpg alt="Cup Mod Diagram" /></a>
Before and After shots
The cup mod is simply changing the arrangement of the anciallary pipework around the carbarettor and the turbo actuator.
The purpose of the cup mod is to enable the turbo to produce full boost quicker than it does normally.
The name "cup mod" is derived from the "Renault 5 Cup" races back in the 80's, there was a series of modications that would be done to a GTTurbo before racing. This mod was one of them.
How to do it
Start by locating the turbo elbow, on the rear is a metal union connecting to a rubber pipe. Undo the nut and remove this. Put a suitable block into the turbo elbow (a wheel bolt works well)
Follow this pipe to the top of the carb, and remove the associated piperwork from the car.
Remove all of the pipework between the top of the carb and the actuator
Run a single pipe of pipework from the base of the carb to the front port of the actuator
Block the top two carb top ports
Leave the rear actuator port open
Coupe book scans
<a href = "http://www.rtoc.org/articleimages/cupmod.jpg"><img src=http://www.rtoc.org/articleimages/article_tn/cupmod.jpg alt="Cup Mod Diagram" /></a>
Before and After shots