What is the recommended injector size for boosted H22's (12-18psi). I'm lookinbg to upgrade. Is 550cc enough?

 

how much power are you looking to make

 

At 18psi, I am thinking 720cc is a better/safer way to go for a H series.

 

when is 550 not enough and 720 needed?

i am going to pick some up, but wouldnt 720 be overkill if was only running 7-12 psi now?

 

I'm looking to put out over 400hp.

 

the infamous 400whp goal....


yes 720s will do.

 

edit: read firedrake post, I plug in 350 hp at the crank, 4 cylinders and .60 fuel comsumption and it ask for 550cc. since you goin for 400hp defenitely go higher than 550.


Modified by LJR-LUDE01 at 2:30 PM 6/11/2003

 

Man, it never ceases to amaze me how much people underestimate their fuel needs!! The calculators at http://www.rceng.com really do work! Put in the numbers and they will let you know what you need.......
I would never go with less than 720's on an H motor. You should already have proper fuel management anyways (Hondata or AEM) so getting big injectors to idle fine should be no problemo. I run 780's and they're great.
Brian

 

i got 756cc injectors you can never have to much fuel if you have a standalone

 

I was actually thinking about a VAFC piggyback/hack. And just a Q' out of the blue: Has the 720's greatly affected your mpg?

 

i've some nice big Precision Turbo 780cc injectors, 500whp mark for me