I have to decide which injector set up to go.
I don't have a turbo yet but let's say 60-1 with 4*850 at 85% duty how much
WHP can I have?is 400 doable? otherwise I have to throw 1600s.
but this is cost efficient if it's possible.

thanks

 

http://rx7.com/cgi-local/3rdgencalc.cgi

all 4 850's would be nicer than 1600cc secondaries because when coming out of boost the pressure change in the manifold from those massive injectors turning off causes the car to buck alittle bit... i'm running 1600cc secondaries 550cc primaries right now

 

436 at flywheel I think it'll be alittle shy on 400 at the wheel.
I really want to hit 400 with a little as possible money.
my tuner said it's possible.
is 85 dutycycle maximum or I can go a little high?

I'll use microtech and walbro.

 

80 is a safe maximum duty cycle.

Anything over that, and you are pushing it.

if you want to push those injectors far, get meth injection!

 

Awhile back I was running 99% injector duty cycle on my stock turbo at 15psi with stock injectors... I only did it for a month but I didn't have any problems, scary though.

 

Took 90-92% Inj duty with 4x850cc to break 400rwh.
With side-feed inj's you could run them at 90% with no issues but going to 2x550cc and 2x1600cc is a better option overall, mainly idle and low load cruising.

Good Luck
JD

 

4x850 might get there with enough fuel pressure, but it will be close.

IMO, if your target is 400 rwhp, go with 550 and 1600

 

1600's FTW

Cheap, and enough fuel for two regular cars