Quote:
Originally Posted by sixto
Looks like the EGR vac amp. You can remove it before you remove the EGR valve. Make sure to plug the supply line where it comes off the engine vacuum pump.
turbobenz is more able than I am (no mean feat to be more able than I am  ) if he removed the transmission vac amp and has tolerable shifts. I futzed with the VCV and bowden cable for days and couldn't get acceptable low throttle shifts. I didn't try a transmission modulator off an MB model with no transmission vac amp. That might be the difference. gsxr thinks the valve body is programmed differently as well.
The attached vacuum diagrams might help.
Sixto
87 300D |
Bypassing all the emission controls has worked out great for me. I don't know if this is true but I think those parts are there to really fine to the car AND to direct the proper amounts of vacuum to different places at different times when different things are happening. For example if the EGR valve wants to open while the turbo waste gate is being actuated and the transmission is shifting from 3rd to 4th. I have near perfect shifting through all my gears except when cold which is a bummer. When cold the car shifts pretty rough into second and I think that MB may have had a system for that.
Im guessing cars that use the vacumm amplifer (like my 85, which has a completely stock vacuum system) use it to shift absolutely perfect and possibly to overcome the loss of vac due to added components. This makes sense because nothing changed between 84 and 85, except that in 85 they started adding the vac amp along with tons of emissions components.