In Reply to: Re: Carbtune synchronizer, where to get in USA? posted by rob on June 24, 2002 at 11:56:12:
After CO adjustment base idle and Throttle adjustment.
Parts to get before procedure :
Tamper proof caps (4) 13-11-1-265-510
Rubber plugs (4)
Carb sync tool (1) Carb tune.($79) http://www.carbtune.com/carbpric.html
BMW (7mm) vacuum hose 8 long cut into two inch pieces.
Throttle adjusting tool - Xcellite P9 spin tight or 7 mm socket on a screw driver handle.
Large flat blade screwdriver ( to adjust idle)
Note the reading on your Tac at idle (spec 88 +/- 50 RPM)
After setting up Carbtune as per their instructions use the four 6mm adaptor supplied with the four two inch pieces of BMW vacuum hose to connect Carbtune hose to your Throttle body inlet tubes.
Remove the tamper proof caps. They will break apart (tamperproof) so you will have to engage the aid of a flat head screw driver. Next the rubber caps if they refuse to cooperate slit them with a razor blade without scoring the brass tubes; that why you bought the spares. Connect Carbtune to throttle body in sequence right to left so that if you are looking at the Carbtune the right indicator correspond to the right throttle adjuster. The Carbtune work best when it is vertical and you might have to use a thick rubber band around the body of the Carbtune to hold the hoses in place. I use the rubber band to clamp the hoses to the back of the carbtune leaving some slack where they are attached to the input tubes of the carbtune. The weight of the rubber hose tend to pull them off the inlet tubes of the carbtune. Go ahead and adjust the throttle using your 7mm tool aiming at equal level as indicated by the carbtune. The measured value is not important only the equal levels. If you run out of adjustment on one throttle adjuster, back it off and equalize the others. That sort of thing, as you play with them you will get the feel (hopefully). At this point if your idle increase adjust it back with the idler adjuster located in the center of the throttle body assy. Spec. call for 88 +/- 50 RPM if you don't have an external Tac. use the reading you made above as your reference. By the way when they are all synchronize blip the throttle a bit to see that they settle back to synchrony. This is one of the reason I chose the carbtune instead of a mercury base instrument since blipping could suck the mercury into the motor; not a good thing. Well you are all done, remove the carbtune and install your new rubber caps. You may want to hold off on installing the new tamper proof caps since you had so much fun you may want to do this again tomorrow : ) Take her for a spin around the block and as Don would say "I told you so"