was going to have my injectors cleaned and flowed, but as thats going to cost around $100, i figure i may aswell assume they are too small and go straight for an upgrade, is there an easy bolt in upgrade known? or what have others done?

also the fuel pressure regulator i am assuming will need to be changed for a boosted car, is this correct, if so can i just use one off a turbo injected car or is there a more exact science to getting the pressures right?

Got a pic of the manifold? Using stock injectors?

If they are the same style injector as the others of that era (bolt on with two screws), the 80-83 Silvia (80-83 200SX) injectors should be an upgrade, as well as '79-83 280ZX. Then the turbo injectors from the same cars are one step up from that.

i know daveman has some FJ20 turbo injectors for sale, came off to upgrade so might not even need a clean and flow? i think they're about 370cc / min, but he'll know exactly. they're hose tail/top feed so they'll bolt straight in

Take a trip to the importers/wreckers to see what fits.

As for the reg, by the changing of the injectors you will be going to aftermarket computer. Use something to suit the computer. If going Deco (other posts) grab one off a camira or whatever, a 3 bar map sensor (1 bar vacuum, 2 bar boost) is available for these.

fuel pressure reg : you will only need to change it if you run high boost. thats a dumb sentence cos "high boost" means bugger all. If you run less than 14 psi, there is a chance that the standard one will do the job.

Think about it, a fuel pressure reg is plumbed into the intake. when vacum is present, fuel pressure is lowered. as the vacum disapears, the pressure goes up. so a boosted car will increase the fuel pressure. However, if the diaphram inside the FPG gets "stretched" too much it may burst.

thats my understanding.

cable tie you seem to know the info i need..

but what you said wasnt entirely clear, can you clarify and maybe give more detail as to where these things are available

thanks for the other info too guys, will check it out
can anyone confirm datsik, i would have thought there would be more fuel pressure with more vacuum????

Just found this in Zoom No.19

"on most normally aspirated engines the difference between idle pressure of around 35psi to full load is in the range of 7psi. This slight rise theoretically increases the delivery capability of the injectors as the load increases which as an end result gives the manufacturer the ability to write a much flatter fuel delivery curve in their software - or indeed use a smaller than normally possible fuel injectors.
What most folks don't understand though, is that the factory atmo fuel pressure regulator is equally at home on a turbocharged engine due to its inbuilt rising rate setting."

"in all instances I have seen, there is enough range left in the atmospheric regulator to cope with an additional 10-15psi of boost supplied by a turbo charger.."

"...don't be fooled by having to lash out great amounts of money on a special turbo fuel pressure regulator unless you can see by watching a pressure guage that your unit does not respond"

I hope I haven't breeched any copy right laws!!!

dont thnk you have breahed copywrite as this site is hosted in portugal and the laws may be different there for this kind of thing.
Also you referenced your source and used "" for quotes.

Also 1200rc will be happy as you have saved him some $$$$$$$$$$$

there is no need to get exotic with a pressure regulator or the injectors. the press. reg. works by increasing pressure when vacuum is reduced, ie: wide open throttle or under boost conditions. the early L28ET engines used the same pressure regulators as the N/A version did, and never had any problems. unless it is leaking or won't hold pressure, there isn't any reason to change it.
for injectors, use the figure of 1.4-1.6 to multiply engine displacement, in your case 2.1-2.4 l disp. as a baseline figure for fuel requirement, this will put you very close to the necessary increase in fuel. there are a good number of stock injectors that you should be able to aquire from your local wreckers for a reasonable price without needing to spend a ton of money. think of CA20, FJ20, and KA24. the L serier 6 cyl. ones will work but might run a bit lean.
referencing another post you made concerning MAP sensors, IF you got the Saab 900 turbo (93-98) there, they also use a Delco system and are set up for boost, if not let me know I can get you one.

I had my factory injectors cleaned and flowed before fitting and was told that the injectors flowed more than a RB30 injector
N/A tihey only ever get to 50% duty cycle.
I doubt you will have to change either inj. or reg.
if you find the need, look at 280zx inj.
most of the newer injectors don't have a hose tail
big range if you go new inj. but more money too!
try what you have, save what you dont need to spend.