i am wanting to put larger fuel injectors to my b18b1. i am not boosting but i would like more hp. what size would be recamended for arround 250hp any help would be apriceated

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lskid98 &raquo;</TD></TR><TR><TD CLASS="quote">i am wanting to put larger fuel injectors to my b18b1. i am not boosting but i would like more hp. what size would be recamended for arround 250hp any help would be apriceated</TD></TR></TABLE>

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Put in 450cc injectors and tune it. that will be enough for 250hp and past that. there is a mathematical equation, I'm sure some one will post it up for u. Someting times cc/ 6 has HP in the equation, i forget.

 

if i put a 450 injector will it put to much of a strain on my fuel pump

 

No you will be tuning it, right? RIGHT. At the same time i don't really think ull need bigger injectors unless ur boosting. How do you plan on hittin that 250 mark? BTW, i DO suggest gettin a WALBRO 255 High Pressure Fuel pump. Its only 100 dollars and probably less on craigslist, where I found mine brand new.

 

How do you expect to get 250 HP from a B18B1 without boost? Changing the fuel injectors is not going to provide a gain.

 

Yeah my point exactly.

So, i went to this site "kgparts.com" and clicked on the injector calculator. From what i see after inserting ur desired 250 WHP, which Im roughly estimating at 280 flywheel HP, on a stock flywheel, at 43.5 psi of fuel pressure with a BSFC at .45 or .5

.45= 413.437 cc/min.
.50= 459.375 cc/min.

So I'm still a little confused, but love trying to figure new things out. I kept most of the same **** there, like the B.S.F.C ( Brake Specific Fuel Consumption) at .5 and the Max duty cycle at 80% which seemed reasonable enough.

Now I have changed the B.S.F.C. to the turbo suggested amount which is in between .6 to .65 and kept the 80% I came up with this answer...

.6= 551.25 cc/min
.65= 597.187 cc/min

So, do it yourself, confirm my answers. But from what I'm hopefully understanding correctly a NA honda motor should be getting in between 413 and 459 CC at max, so it would probably use 450 cc injectors, and a turbo one would be getting inbetween 551 and 597 cc, needing 600 something cc injectors.

Hopefully I did this right and am understanding it, someone confirm please?