Turbo or Non-turbo injector question

[Peter]

I am trying to bring the car back to original specs and I would like to exchange the  injectors on my 86 jetta Turbo...three parts resellers all say that  this car came with non-turbo injectors unlike for example the 84's which have a listing for both types of injectors...since I did not have the car from new, it makes it rather difficult to determine the truth in this....at the moment I can not check to determine type of injectors I have and yet my injection Fuel Pump is a turbo style and yet the  resellers call for non-turbo injectors....if for example the car actually did orginally come with Non-turbo injectors..( did VW make use the turbo style inj pump for both turbo and non-turbo injectors)....does this mean that the pump was set up for this application and would not gain any benefit from turbo style injectors..or...if the pump is calibrated for turbo injectors, would the installation of non turbo inj. cause any other problems....it just occured to me that maybe useing the vin # at the VW dealer would help here??..but then again I know the pump is not orginal...

[jtanguay]

there was a thread going where someone had achieved better economy with non turbo injectors but with advanced timing.

[Doug]

My understanding is that the nozzles and nozzle bodies are ths same for the the turbo and non turbo. The difference lies in the amount of spring preload behind the nozzle which is achieved by shimming the spring inside the nozzle body. If you take one apart you will see how simple they are inside. You are right that there seems to be a lot of resellers that do not carry listings for the turbo injectors complete. If you are unsure of what to do, take your injectors to a diesel shop where they can replace nozzles and shim the injector, as well as test for the correct breaking or opening pressure which is higher in the turbo than the N/A because of the higher combustion chamber pressures.