Fuel tuning and injectors

[cptkill]

Anyone know if there is a performance difference between the 83 and 84 injection pump or injectors? I see some physical differences in the pumps but don't know if that transfers to any performance changes.

[skullzaflare]

You think they would restrict the exhaust to much?

The stock td04 is overly restrictive on the d56, only .2l more and same compression but 1k less RPM. You would want a little bigger to allow the higher RPM, if single turbo i would probably look for a td05h size. 2 td04 would probably be fine.
Intake wise, the 9b doesnt put out enough air to make the 2.5 happy, 30psi stopped in its tracks at like 2500rpm. 15t was better though took 35psi for 3300rpm though. But again im talking about single turbos on the 2.5

Anyone know if there is a performance difference between the 83 and 84 injection pump or injectors? I see some physical differences in the pumps but don't know if that transfers to any performance changes.

Only thing i know on the 4d55 was there is one year with one off smaller threading injectors so they wont fit anything else.
You can use a 4d56 pump and injectors as long as you dont have that 83 head lol. Dont know if there is any help from it though