who came up with the idea that supra injec., are 360cc? Options

[presure2]

so...anyone know whos idea it was that supra 315cc injectors become 360cc in our cars?
after doing a little research, i noticed that our FP and the na supra fp is the same, its the TURBO that has a lower fp.

this means that those injectors are only good for about 192hp or so @ 100% duty cycle..ill have the printout from RC Engineering scanned into the 'puter and put it up here in a day or so.
i think without a FMU, some of us will be running real close to the edge thinking we're safe..
gee, and we wonder why theres all these dead 5sfte's out there
cant be THAT simple, can it guys??
itchy, if what im thinking is true, man your REAAAALLLY close...
is anyone running a fmu? if so which?
hmmmm

[presure2]

ok guys after checking this all out again, it seems the intial formula that i got from someone on the mr2 board wasnt correct.
the formula goes like this:

injector size 315cc=30lbs per hr X 3.2(80%duty cycleXnumber of cylinders)=96 X .61(brake specific fuel consumtion)=58.56hp per cylinder X 4 =234.24 flywheel hp THIS MATH IS WRONG!!!!!
so thats what we're "safe" up to. after that, who knows..lol
the formula was taken from rc engineering's tech section, so i trust that.
sorry for gettin on ya shid.. just like to try and keep the posts helpful
its that rule that mamma always taught me, "if you dont have anything good to say, dont say anything at all"
:::EDIT:::chris D from celicatech posted the correct was to do this math. here it is.

You need:

(Inj. Size)*(duty cycle) / (BSFC) = HP/cylinder

(30lb/hr)*(0.8) / (0.61) = 39.344 * 4 cylinders = 157hp

Reported numbers higher than this very likely have a duty cycle higher than this. If you use 100%:

(30lb/hr)*(1.0) / (0.61) = 49.18 * 4 cylinders = 197hp

This also assumes that the base fuel pressure is 42psi or whatever the 315's are rated at.


This post has been edited by presure2: Dec 18, 2004 - 8:36 AM