93civiczex

iam putting a zex kit on my 93 civic it is all stock for now i was lookin to see what camshaft i should use on a 75shot dry and what camshaft makes the most hp for my d16z6

nuclearhappines

dont do a 75 dry. the way the dry kit works is by multiplying up your fuel pressure.

Typical fuel pressure is at 45psi, the dry kit when activited will bump it up to the max safe pressure for your injectors which is about 100psi. This means your fuel flow (which relates to the square root of pressure ) will increase by 50%

This means that if you spray at 3000 rpms (When your car is only making say 90hp) you will get 75hp worth of n2o but only 45hp worth of fuel and you will run lean.

As your fuel injector duty cycle increases (with rpm and hp) then the amount of fuel available will grow towards the higher rpm and you will be fine, but spraying a decent size shot (on a small sized motor) at a low rpm, with a dry fuel pressure based kit is not the smartest thing to do.

If you really wanna do this, look at a dyno for da16z6 with similar mods to yours, look at what rpm that car is making 150 crank (135 wheel) hp at , and that will be the lowest rpm you can spray that shot at.

If you wanna spray a 50 shot, do the same for 100hp or maybe 85 whp
If you wanna spray a 35 shot , do the same .. 75hp ... etc

Get it ?

nuclearhappines

here;s a thread showing slightly modded d16 power

https://honda-tech.com/forums/showth...light=d16+dyno

if your motor is in similar state here are your options:

35 shot above 3200 rpms
50 shot above 4700 rpms
60 shot above 5500 rpms

You will never have enough fuel to spray a 75 shot with an out of the box zex fueling scheme...