87GTR

iTrader: (61)

Ok here is the deal I lost my injector fuel calc
so im going to ask a few questions.

my car is being converted to this setup

91 engine half BP
Twin GT2835 turbos
2 720's 2 1600's
RP comp fuel pump
Aquamist 2C
Haltech E6K
water/air IC
ditch the OMP and run premix
planning on run race gas and NGK 11's

do I have enough fuel to support 1.8 - 2 bar of boost?
do I need a larger pump?
what size waste gate should I use
what BOV will take 2Bar?
do I need a CID?

what other mod would be recommend to do?

KraftDinner

You will need a larger fuel pump (or two large ones).
Also you will want to upgrade your primary injectors. 1200cc probably, but 850cc might do.

KraftDinner

Yeah, definitely one super huge pump, or two large ones. Upgrade your fuel lines if you haven't. 1200cc primaries and 1600cc secondaries.

Can't give you advice for what wastegate and bov though.

Other mods?
- Install a roll cage
- upgraded engine mounts
- maybe an engine brace
- drastic clutch upgrade if not done yet
- transmission upgrade will be necessary in short time after that work is done since you will be pushing about 650 rwhp
- not familiar with the PFS ecu, but if it's not a stand alone EMS (haltech, microtech, wolf3d, electromotive, motec, etc) you will need one.

87GTR

iTrader: (61)

oh yeah its getting a cage / drive shaft loop /
already have haltech ecu
cluch is a OS twin

Im thinking using twin bosch fuel pumps.

once the tranny breaks im going to get a dog tanny

I wounder with 1200's in the primarys how the driveablity will be.

Thanks for your help

HWO

720 primiaries and 1600 secondaries is good for around 720HP at the flywheel at 10:1 A/F ratio mxed out, base pressure 35-40psi

I will be running 4 x 800's + 2 x 550's on my Semi BP motor, single T04............ When do you hope to have yours sorted by Tony? i hope to have mine tuned etc by about october could be interested to compare dyno sheets, make sure you take pics of your ports if possible.

Cheers
Shane

HWO

and yes you'll probably need either an SX 1000HP pump or a pair of pumps rated at around 500HP each.

I'll be running a pair of Skyline GTR pumps which are good for around 550HP in a skyline

87GTR

iTrader: (61)

yeah mine should be ready about the same time. once I get it done and run it on the dyno I post it. right now im saving for the turbos / down pipe / manifold . I was going to have it done from KSP Enger in japan when I 1st started planning for this.

then I met Tim from RPM Performance Centre he is building the manifold /dp/mp/

I need to deside on a wastegate so I can get him started.

87GTR

iTrader: (61)

right now I have T04E on the car and going to see what kinda of power I can get out of it 1st. onces its ported and put back together going to dyno it with T04E and compair how the twin GT28's do.


on the GT28's they come with internal wastegate but for like 250au you can get them with external. I wounder if the wastegates that come with would be enough or if I should get 1 big wastegate to control both of them. Im going to be using the Blitz ID ver 2 boost control.

87GTR

iTrader: (61)

would it be better to do 2 external pumps or keep the rp comp pump and get 1 more external pump?

vosko

iTrader: (4)

fuel sump and two external pumps and ss braided an lines from sump to engine

soul assassin

that much boost you are going to need bigger injectors in my book i run 4 1000 cc injectors and it is still driveable, thinking about upgrading the secondarys to 1600cc and running the big aeromotive pump next! that is just for 1.6 boost, so i would asume you need more go go juice

HWO

Soul - are you running factory fuel lines?

UnSeeN

damn 2 bars = 30 psi right?..thats a lot of damn boost! what do you plan on doing with that setup?

87GTR

iTrader: (61)

yeah the stock fuel lines are too small and too old, im going to replace them with good line.
what size do you think?

87GTR

iTrader: (61)

want a street car by day. running low boost 1bar.
and one you can take the the track turn up the wick and run 2bars and bust a run into the low 10's or high 9's

87GTR

iTrader: (61)

if I get 20K out of the motor Ill be happy.

87GTR

iTrader: (61)

im going to work my way up to 2bar
I found a fuel calc
2 720's and 2 1600 @ 80% should be 530hp at the flywheel.

KraftDinner

You have to be careful with the online fuel calcs, since rotaries have a higher BSFC than most others.

87GTR

iTrader: (61)

http://www.rx7.com/cgi-local/2ndgencalc.cgi

this is the one I found. how good is it?

j9fd3s

iTrader: (3)

stock duty cycle on a stock ecu is like 90%+ (ask reted they ested it on a bench), so the stock injectors in the calculation are good for 285hp. max cooper has one too
www.maxcooper.com

mike

95MX6

Wrong, stock duty cycle is 58-63%. Injectors should never be programmed for more than 80-85% duty cycle. Above 85% injector accuracy gets weird, most injectors will stop pulsing and just stay open. Also duty cycles above 85% can raise injector temps, which will reduce injector life (a bad thing).

j9fd3s

iTrader: (3)

http://www.newwave.net/~flanham/wlan.../3modrule.html
and k2rd tested a stock 87-88 ecu on the bench and it was over 90% duty also.

mike

soul assassin

i usually go with 600 cc of fuel to every 100 horsepower! but pushing 30 psi of boost will put you way over 500! the line from my tank is stock just from the y block to the fuel rail is -8 line

87GTR

iTrader: (61)

I hope 30 psi is well over 500hp

if ksp eng can do over 700 @ 1.8 bar

soul assassin

ksp was my only comeptition in japan! thank god i left they would have waxed my *** up and down the track with the new engine they built up! oh yeah quit being a wuss and full bridge it! why half bridge? looks like you are going to race only any way