fendamonky

iTrader: (6)

I have a quick question... I am about to order a pair of BNR's for my car. I will be upgrading the fuel system a bit and turning up the boost to 14-15psi when I get the new turbo's in..

What I want to know is if I will be able to safely run that boost level on the BNR's using 93-94 octane fuel with an 850/850 setup and upgraded fuel pump... Depending on how everything goes I might even consider putting on a free-flow MP.

I just want to know what I can expect with 850/850 (I want to use this because I already have the extra injectors, would rather only have to do the job once)

Things already installed on my car:
PFC w/Commander, FC-Datalogit, Boost/Oil Pressure gauge, Alum AST, Koyo Radiator, Dual Intake, Greddy SMIC, SS DP, Hi-flo Cat, Apexi N1 Duals, KYB Shocks, Tein Springs.

Things I have that will be installed soonest:
DP w/ 2 bungs, Innovative LC-1 w/ gauge, Banzai Racing Diff Brace.

Things I am waiting on and will go in before turbo's arrive:
Rear Harness Bar (courtesy of Saxyman990), Brembo Brake kit.

This is all I can remember atm.

Any thoughts would be much appreciated!


Thanks,

Levi

GoodfellaFD3S

iTrader: (213)

No. I ran 850s and 1300s and it was just enough. This was with a supra pump, which wasn't really sufficient at levels above 15 psi, so the IDC was cranked up to compensate for a drop in fuel px.

FD3S2005

iTrader: (11)

whats the IDC? so yous saying 1300s were just enough? would it be better to get bigger secondarys then 1300s if going 15-16psi? i want to know because i plan on getting the bnr

fendamonky

iTrader: (6)

Rich,

So would you suggest it best to go with 850/1600's than? I admittedly don't know that much detailed info about the fuel system requirements. I am looking for full set-ups and this is the most complete one I have seen, though it is missing a pump..

What set-up would you suggest for the application I mentioned in the original post (I forgot to say, but I'm thinking a boost controller will make it's way into the mix as well)? I'm not the richest guy in the world, but I will do what I need to for it to be done right, the first time.

Thanks a bunch for your input!

Levi

charlies7

iTrader: (4)

Run whatever amount your injectors can keep up with, its simple. Make sure the duty cycles are around the magic 85 percentile and go have fun, but what rich said, go with 1300's to have that extra fuel just case

Edit, You'll prolly max out the twins at 17 psi ish..Maybe im wrong. 850/1600 is a lil overkill for upgraded twins but if you wanna go single eventually why not!

GoodfellaFD3S

iTrader: (213)

IDC=inj duty cycle.

the newer BNRs are supposed to be good to 19 psi. I've seen that much on the street, the car flew.

mods etc:

https://www.rx7club.com/showthread.p...light=dyno+bnr

fendamonky

iTrader: (6)

Ok, Thanks for the heads up guys!

Now my question is this... where would I find good 1300cc secondaries? The several sites I have checked out really only have 1600 kits..

Rich,

You said the Supra pump was barely treading water... what would you suggest I get to replace my stock pump? (I really don't intend to go over 16psi tops)

Again, thanks a bunch for the help guys!

Levi

fendamonky

iTrader: (6)

Hrm.. I have been told that 850/850 should be good for up to 500whp, you just need to turn the pressure up.

What are the error/dangers associated with this? I would honestly rather play it safe with the fuel.. I don't want an excuse to get a street port THAT bad...

FD3S2005

iTrader: (11)

i wouldnt be safe running 850s at that psi... steve kan told me 1200cc for around that psi is good and i heard about 1300cc having issues, i dont know would it really be bad to just throw a 1600cc... haveing low IDC bad or something?

twokrx7

iTrader: (1)

Rewire the pump to get more voltage and even your stock pump will likely be ok, worse case just drop in an in-tank upgrade with the re-wire job and you are fine on pump capacity. It's a good idea to install an in-cabin electronic fuel pressure gage to determine if the pump pressure is falling at high rpms.

On the injectors, better imo to get the "new" 850's enlarged for the secondaries and stick with stock primaries, stock primaries idle much better. Lots of options here tho, the 850 primaries can be setup to work ok and give you alot of fuel in combo with 1200/1300 enlarged secondaries, thi is your decision and it depends on who will tune your car as their capability to get the injectors setup and tuned well may vary. If you want to be able to increase fuel pressure you will need to add an adjustable fuel pressure regulator to your fuel system along with a pressure gage, I prefer an in-cabin electronic sender unit setup rather than a mechanical underhood gage.

fendamonky

iTrader: (6)

So the secondary rail will need to be upgraded for me to put anything larger than 850cc injectors in I assume.

If I were to go 1300 secondaries would I need to find a rail designed for 1300's specifically? Or can I basically fit any injector UP TO the size the rail is meant for? I'm seeing a lot of 1600cc secondary rails, but nothing smaller.

What kind of modifications would need to be done to a rail to fit in an injector smaller than it's designed application if they do not fit in on their own?

Thanks again guys, sorry for all the questions.

Cheers,

Levi

FD3S2005

iTrader: (11)

get it bord out by RC and you can use the stock rail i believe

TRISPEEDFD3S

iTrader: (26)

As FD3S2005 said, bored out the stock secondaries to either 1200cc or 1300cc and you'll be fine without modifying the secondary rail.