fitted earlier this week in b16 and had bad idling probs which has been sorted 80%. anyway had apexi power fc fitted/setup few days ago and peak power comes at 7331rpm .

car drives great etc but was just messin with fc commander viewing injector duty and showed they max out around then so figure this is problem.

i have no tech/motor knowledge hence newb type questions. i then just thought well, ill go buy some bigger injectors but is it as simple as that ? do i have to get fpr as well ? could fuel pump be faulty ? easiest and cheapest solution ( im thinkin lude injectors) ?

before i was runnin itr cams that peaked just over 8000 rpm

 

BC3+ seems to peak around that area anyways if you look up the few dyno charts on them even on b20vtec setups they pull 220whp and such but peak at 7500 i guess because of the lift on those suckers, in which case 4s have the same lift but more duration which those end up peaking high and u dont loose anything in the mids. btw what injectors you using anyways?

 

injectors are stock but from what people are tellin me they should be fine

 

get it tuned

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedR &raquo;</TD></TR><TR><TD CLASS="quote">get it tuned </TD></TR></TABLE>
yes

 

was tuned with apexi power fc, cams are set at in 2 deg and ex 1 deg but could do with fine tuning

 

something is wrong and they dont peak that early. I have them and baselined at 178 at 8,300 so sounds like something is wrong to be. And these cams have ALOT of duration not alot of lift. the diff between 4s and 3plus is a lil on duration and mostly lift.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vti444 &raquo;</TD></TR><TR><TD CLASS="quote">was tuned with apexi power fc, cams are set at in 2 deg and ex 1 deg but could do with fine tuning
</TD></TR></TABLE>
Who's dyno did you tune it on? What fuel pump are you running? I would think that it wouldn't hurt to run some 270 cc or 310 cc injectors, but that's entirely up to you.

 

im in the u.k, was tuned on a dynapack dyon. fuel system is all stock

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chameleon &raquo;</TD></TR><TR><TD CLASS="quote">BC3+ seems to peak around that area anyways if you look up the few dyno charts on them even on b20vtec setups they pull 220whp and such but peak at 7500 i guess because of the lift on those suckers, in which case 4s have the same lift but more duration which those end up peaking high and u dont loose anything in the mids. btw what injectors you using anyways?</TD></TR></TABLE>

Comparing the peak of a 2.0L versus a 1.6L with the same cam is incorrect. The 2.0L will flow more air, thus taxing the VE of the motor at a earlier rpm. On a B16, that peak should be significantly higher.

 

from what ive read stock injectors should easily cope with power im runnin. there same as itr which is roughly what output i have now.

im not sure im readin it right but but the fc commander says inj duty is at 100% around when my power peaks . dont know if this means theyve been set like that or are maxin out.

i have all the bolt on mods to allow my car to breathe well at 8krpm +

fujitsubo rm-01a
test pipe
spoon header
comptech icebox
ek9 i/m
ek9 t/b

1 prob i may have is my vison test pipe is the smaller version not 2.5" like my header collector and exhaust. i had 2.5" flange welded on but could this be causin such a big loss ? i do have ek9 2.5" cat i can try but wouldnt know success unless dynoed at same place again

 

I was running OBD2 Prelude injectors (290cc) on my B18CR with the BC3+ and they were working at 58% according to my hondata

I can remember where power peaked but my dyno is on here if you want to search

Power Peaked at 7500

 

I have a JDM ITR motor with BC3+ and I topped out at 200whp @7946rpm on a dynapack dyno. I have RC 410cc injectors tuned with Hondata. I'm not sure of the duty cycle the injectors are running at though.

 

kevmi44, itracer121 and sheepeg3

what are you cam gears set to and valve lash ?

 

If injector duty cycle is 100%, at ~7300rpm and A/F ratio looks decent then I would say you have maxed your injectors, at least at that fuel pressure. My recommendation is check fuel pressure, make sure its not unusually low. Pick up a AFPR and bump the base fuel pressure, this effectively increases injector flow.

I just couldn't imagine you taxing the fuel injectors with that setup. I would almost have to say fuel pump or FPR is resulting in low fuel pressures. Or the shops wideband is screwed.

 

just managed to speak to shop where power fc was done. they said injectors had maxed out and not them that had set to 100%.

is there any way i can do test on fuel pump and oem fpr to ensure there workin to full potential or will i have to get shop to test ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vti444 &raquo;</TD></TR><TR><TD CLASS="quote"> they said injectors had maxed out and not them that had set to 100%.</TD></TR></TABLE>

Huh?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vti444 &raquo;</TD></TR><TR><TD CLASS="quote">is there any way i can do test on fuel pump and oem fpr to ensure there workin to full potential or will i have to get shop to test ?</TD></TR></TABLE>

Just need to monitor fuel rail fuel pressure. Any service shop should be able to help you. Or pick up a fuel pressure tester or guage at your auto parts store.

 

bc3's on a b16 make power through 8200 from what I read, but the power from the cams comes at low to mid range of the powerband.

 

found someone over who is very good with hondas. he reckons dyno had been setup incorrectly.

anyway im gonna take my car to this guy who is gonna tune my cams and make sure they were installed correctly as well as re tune power fc. very very confident he is gonna sort it all out so just waitin now until he can fit me in.

lot of mods ive done have been to improve mid range for my daily driver which was main reason i went for bc3+ cams. thats main area he is gonna work on

 

to my knowledge you do not want to ever get near 100% duty cycle on those bad boys get some bigger ones!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1SlowB16EF &raquo;</TD></TR><TR><TD CLASS="quote">to my knowledge you do not want to ever get near 100% duty cycle on those bad boys get some bigger ones!</TD></TR></TABLE>

True with aftermarket ones. OEM Honda ones go to 100% on the factory maps. Could it be they use a different standard?

 

i almost max'ed out 340cc injectors. on my bc3+. i went with 400cc now

then again, i have, 12.8:1 compression bc3+ and an aebs/manifold.

i have more air getting sucked in then you, and i need a lot more fuel as well..

 

i have some prelude 290cc injectors on standby anyway and did buy fpr (of someone on here over 6 weeks ago but still aint got it). ill just let the guy work on my car and fit whatever needs to be fitted but like i said i shouldnt really need to uprate much as my motor isnt pushin much power anyway

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by -=Zeqs=- &raquo;</TD></TR><TR><TD CLASS="quote">

True with aftermarket ones. OEM Honda ones go to 100% on the factory maps. Could it be they use a different standard?</TD></TR></TABLE>

its just that they spend only a few seconds at a time in the high duty cycles and spend more time in the low area so the use a small injector for better idle ect.