How much boost with 310cc injectors? - Honda Forum / Acura Forum

Civic_Si_Guy · 05-13-2002, 08:08 PM

I was just wondering how much boost I could run with 310cc injectors, 50-60psi of rail pressure, and stand alone ECU to control the hole thing (The ECU has a boost function that will increase the injector pulse length per pound of boost). We are putting this all on a B16 with t3/t4 turbo on it. I don’t wont to run a FMU on my car because of the insane rail pressures they can produce (I now they can produce well over 100psi which is damn hard on the injectors). So any input on how much boost or HP I will be able to run WITH OUT the FMU would be very helpful.

Thanks

94SiSQO · 05-14-2002, 05:35 AM

it's more dependant on your hp figures... there is an injector calculator link that someone's posted up before.. maybe do a search for injector size calculator

themi6group · 05-14-2002, 05:54 AM

and i also know that 310cc at 10 psi is comfortable. how much over that, i'm not sure.

b18c5turbo · 05-14-2002, 12:51 PM

Quote:

Originally posted by themi6group
and i also know that 310cc at 10 psi is comfortable. how much over that, i'm not sure.

10 psi on a b16a CAN generate like 250-260 whp that would max out easy the 310 cc
becareful there tuning is the key

themi6group · 05-14-2002, 01:18 PM

Quote:

10 psi on a b16a CAN generate like 250-260 whp that would max out easy the 310 cc

b18c5, well that's not quite true. 10psi would only put the whp around 210-220 with absolute proper tuning. it's not horsepower that limits injector rates but boost. at 10psi, 310cc's would be able to handle it.

b18c5turbo · 05-14-2002, 02:37 PM

mmmm you need do do some home work there!!!no offence

themi6group · 05-14-2002, 04:29 PM

Quote:

b18c5turbo mmmm you need do do some home work there!!!no offence

look at your sentence. maybe you need to do some homework. hmmm

Dr Drew · 05-14-2002, 05:41 PM

10-12lbs can produce 240-260 whp on a internally stock B series engine. This is mainly because of the stock compression. Lower the compression and the power drops accordingly. According to the RC website on a turbo'd engine you could safely produce 210 hp with 310cc injectors.(80%duty cycle) Although, I personally know someone who was running a lot more boost than that on stock B16 with 270cc's. In other words your not going to know till you strap the thing down to a dyno. Results vary greatly between cars and climate.

As a rule of thumb you never wanna take the duty cycle of your injectors over 80-90%. So, 310 injectors maxed out will produce 230 hp. 310 injector will produce 210 hp. Here is a link to the RC site where you can check it out.

RC engineering

themi6group · 05-14-2002, 06:40 PM

thanks drew, but 240-260 horse's are not at the wheels with 10 psi. at the flywheel.

themi6group · 05-14-2002, 06:42 PM

thanks drew, but 240-260 horse's are not at the wheels with 10 psi. at the flywheel.

cont... depending on kit and setup. i guess you're about right.

Dr Drew · 05-14-2002, 06:44 PM

Quote:

Originally posted by themi6group
thanks drew, but 240-260 horse's are not at the wheels with 10 psi. at the flywheel.

My friend dyno'd 250 with around 10-12 lbs with 10:1 compression in this C1. Yeah the turbo makes a big differance too. He was running a t3/t4e.

b18c5turbo · 05-15-2002, 02:30 AM

Quote:

Originally posted by themi6group

look at your sentence. maybe you need to do some homework. hmmm

sentence mmmm what sentence?

IMPORT DYNAMICS · 05-18-2002, 01:47 PM

I have the 310's with my greddy 18g kit on a 98 gsr. I ran 201 bhp at the wheels and 173 lbs of torque at an untouched waste gate set from the factory at I believe 7 psi. My autometer guage shows 8 psi. I have a safe almost too rich fuel curve all the way to 7,000 rpm's then aims towards lean after that!!!! I currently am short shifting at 7k until I decide which way to go with fuel tuning. FMU, VAFC, standalone? Decisions decisions!! I need to richen up the curve past 7k then turn the boost up about 1 psi. I road raced it last weekend at Road America and short shifted and was able to run VERY competitive. I am getting about 10 more mph down the straights!! 130 vs 120 last year naturally aspirated. I just need to know if tossing the blue box and using a vafc is the way to go.

Civic_Si_Guy · 05-20-2002, 04:19 AM

IMPORT DYNAMICS :

Do you have a Turbo kit or a custom made turbo setup? Also are you using any other type of fuel management other then the 310cc injectors and the sock ECU (like a FMU or something)?

Thanks

blueSI · 05-20-2002, 08:15 PM

Quote:

Originally posted by IMPORT DYNAMICS
I have the 310's with my greddy 18g kit on a 98 gsr. I ran 201 bhp at the wheels and 173 lbs of torque at an untouched waste gate set from the factory at I believe 7 psi. My autometer guage shows 8 psi. I have a safe almost too rich fuel curve all the way to 7,000 rpm's then aims towards lean after that!!!! I currently am short shifting at 7k until I decide which way to go with fuel tuning. FMU, VAFC, standalone? Decisions decisions!! I need to richen up the curve past 7k then turn the boost up about 1 psi. I road raced it last weekend at Road America and short shifted and was able to run VERY competitive. I am getting about 10 more mph down the straights!! 130 vs 120 last year naturally aspirated. I just need to know if tossing the blue box and using a vafc is the way to go.

get a vafc and mess with the fuel , but i dont think that you can throw away the blue box.