Josh&fd

My mods to my fd are: front mount, koyo rad, greddy elbow, turbo back exhaust, and a soon to be -non sequential conversion to the stock twins (ported wastegate, and some flappers cut off), and a power fc along with little things i may be forgetting.

So my question is, what fuel set up should i use? im only looking to run about 12 psi or under for boost. Would a supra tt (rx7store) fuel pump be fine? or will i need injectors too? Thanks for any help

MakoRacing

iTrader: (12)

A supra pump and 1300cc secondaries should be plenty for what your plans are.

Josh&fd

Ok. are the 1300's completely necessary? i plan on buying a single turbo sometime this year so i dont wanna buy injectors if im gonna change them later anyway. thanks for the info.

Double_J

iTrader: (28)

I think you would be better off getting the secondaries because it will allow you room to increase the boost ( if you desired ).

When I had the stock injectors, I was at 100% duty if I ran 15lbs of boost.

If you are only boosting to 12 then you might be able to get by with the stock 850s but for $300ish dollars you would certainly have enough.

GoodfellaFD3S

iTrader: (213)

I'd say get the Supra pump and get the car tuned with the stock injectors. Use the PFC commander to keep tabs on your peak Inj Duty Cycles. The stock side feeds can handle more than you think..... at 12 psi you should have enough for the time being until you go single. I'm assuming you have stock intake and IC, you didn't mention otherwise.

BlowenByTwins

iTrader: (6)

Get the Denso (Supra TT) pump and a set of 1600cc injectors and use your stock secondary injectors as your primary injectors (you'll need a modified primary fuel rail to do this) Rx7 Store sells them and I also have one that I'm selling.

http://www.rx7store.net/product_p/modprimary.htm

850cc primary injectors and 1600cc secondaries will work great on a single turbo setup as well.

FD3S2005

iTrader: (11)

i was at 100% at around 12-13psi when i had the car kinda stock

Josh&fd

sorry when i said front mount, i meant front mount intercooler, and ya i forgot about the hks intake. I'll run the supra pump and hold out on getting new injectors for now. ill keep taps on the injector duty though. Thanks for the help guys.

arghx

iTrader: (3)

Rewire the pump (even a new one). It makes a big difference.

zack4173

iTrader: (3)

I have practically the exact setup you want and I only have a supra fuel pump as far as fuel goes. See the mods in my sig.

Josh&fd

Oh ya street port too. Dont know how i forgot that one lol. Looks like I'll rewire the pump aswell.

Wasn't expecting that much power. Should be fun when it's all done.

grimple1

iTrader: (1)

A couple of things about upgrading fuel injectors.

Anything over 1300cc in the secondary is gonna require someone to adjust the PFC with a datalogit. Without a datalogit you can only go up to 1300 max.

850s in the primary is a nice option; however, you're gonna need to spend a good deal of time adjusting idle - ask yourself if this is something you can do. I don't know if it is or isn't but you should know this going into it. Not to mention you'll need to have a machinist mill down the primary rails as it is not a direct plug-n-play.

I'd honestly just take Rich's advice and stick with the stock.

If you do go with the 1300s, you can send out your 850 secondaries and have them modified to 1300. Many companies do this; however, I highly recommend RCEngineering. http://www.rceng.com/

oo7arkman

iTrader: (2)

I am with Rich and Grimple on this one too. Get the supra pump, rewire it and get it tuned by a rotary tuner. If you are close to maxing out at 12 psi, then just back it off to 10psi and wait until you go single.

IF you do go ahead and buy injectors there are a few threads on here discussing high impedance injectors from injector dynamics that may be a better choice than the older 1680's alot of us are using. If you replace them get something that will work with whatever single setup to plan to go with. This way you do not spend money twice.

FWIW, I was still sequential, but I ran 12psi all day long with only the supra pump. Inj duty cycles never were in the danger zone.

Gurew

iTrader: (4)

bosch 044 fuel pump

Josh&fd

Thanks for the great info guys. I have another question not related to the fuel but i dont want to start a new thread for 1 question, so please forgive me. I'm went to get my wastegate ported to 1.24'' and he showed me how much porting would be done.

It looks like the flap that covers the wastegate would 'just' cover it, and with the play in the flap, sometimes there would be exhaust leaking through. Is this normal, or am i trying to port the wrong piece? lol

Josh&fd

anybody?