i have bought two size injectors before already some rc 550 which were not enough and now i have in some precision 780cc which only carry me to about 14 psi on my 6262 turbo..
my baseline pressure is already 75 psi..

now am considering buying bigger injectors should i just buy 1500cc and forget it or should i buy 1000cc..my goal is 6oowhp..

thanks

 

What is the model of the injectors? SH or SL? If they are either of those then the max pressure you will see out of the injectors will be 65 on one and 70 on the other. Cant remember which is which.
I think your base pressure is too high, but I dont know your setup.

 

Base pressure aside he's not making his goal. What fuel do you want to make 600 with? Can you up your base pressure to 100? If so; 100psi, ID1000's, a walbro 255 and an 044, and E85 can get you 600. If you're running C16, you can run less base pressure and still get 600. Avoid 1600s if you can, they idle like ****

 

was using c16 on my last trial....
my set up
9:5 piston and rods
acl bearing
arp head bolts
block guard
stock head but soon to be rebuild to rev to 9500 or 10000 rpm
skunk 2 tb
methanol injection set up
full race mani
shity ic from ebay
44mm wg
6262 precision .60ar and a .82 back housing
2 walbro fuel pumps
msd 4al
ect
and running ngk8

am planing to do a tune on pump gas with a water meth mix and one with c16..

dont wanna go to the dyno and be limited by fuel ...

 

You can make 600whp with 1000cc injectors on a single intank 255

 

I don't think you want to run your walbro's past 75psi. And I don't think you can make 600 with 1000s on a single intank on E85. Check out T1's chart:

 

i think the issue may the high base pressure with the walbros. dont they stop flowing at that high base? ( i may be wrong but i remember seeing somewhere that as the pressure gets too high on the walbro, flow dropsoff.)

made 540 on a tired old b16 with a walbro and 1200's with room to go, the engine just wasnt responding any more.

 

you should be fine with the 1000cc

 

ID1000'S ftw!