928JET

What are my options to uprate the fuel pump in my 84 euro?

I'm looking at a small NOS wet kit single injector as a addition to her..50-75hp..nothing major, just something to try on short 1/8th tracks to get over those tall gears and give a little boggie on the rare times I have a play there.

I have a good free flowing exhaust, thermo's already..the additional power wanted is to get it off the line quicker..

first step from experience says uprate your fuel pump.

davek9

You won't need to upgrade the FP, I run a 150 Wet without any issues on fueling AFR on a 5.0 32v
I would suggest you replace the filter unless you know all is well and you have good Fuel pressure.
I would highly recommend you monitor the AFR with a wide band O2, and pull your spark plugs after a few runs at WOT to see how the timing is, I went through at least 4 sets during my tuning also going to non-projected and colder.

Have fun,

Dave

SteveG

I don't speak Auzzie, but "thermos" are summer temps?

There are many threads here on this, a current one is running but concerns a 90 GT.
[editing: I see you are in the GT thread. Nevermind]

For knowledgeable faster service I would call Roger at 928sRus, Mountain Time, or 928 International in LA, Pacific time; both are sponsors here (search is your friend) and know their stuff.

928JET

Yeah I want to rig her for spray.

whats the gph on the std pump?

davek9

IMO the hardest part is keeping the bottle at the correct temp so that it will maintain a constant pressure, that pressure is determined by the Jet size you use, and they are determined by what your FP is at and what HP you are looking at.
I ended up with an AFR and a bottle pressure gauge in the cockpit so I could monitor whats going on, also had a FP gauge connected when I was tuning.

Did you search for "nitrous" in this forum?

928JET

I will read plugs and "boom" the system.

A bottle warmer will come to keep pressure up in the bottle and bottle gauge.

my concern is the std pump won't keep up and lead to a lean mixture

Having enough window in fuel pressure is really all I'm asking. So im not bleeding the fuel injectors dry and leaning out.
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Can that std pump flow enough to handle around 400hp in the top rpm with a safety window to spare? If It can great..

Nitrous will drop the given HP at any given rpm..unlike turbo or supercharging.. Don't matter if its 2000 or 5000rpm..it will drop it at the flick of a switch or on a set throttle activation..that's why I wish to run it this time..no time to build boost, I'm Auto so not slipping a clutch to build boost must be all go straight away on short track.

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davek9

400 HP by adding a 75 shot OK, but unless you monitor the AFR you won't know if you need a larger pump or simply need a higher Fuel Pressure Regular, also you need to know what the Fuel Pressure is at so you can correctly select the Fuel Jet size.
You can always just spend the $'s and put in a larger Fuel Pump if you feel its needed.

I'd suggest you spend your money first on the monitoring tools (like a Wide Band O2 w/ gauge and logging output) and see what's needed before buying parts that you may or may not need, as you will NEED the monitoring tools for tuning anyway, right?
As I don't know the condition of your 928's, and at this point in time all are not equal, all will require tuning to gain reliable HP, can't just add a standard kit and expect great results.

How are you going to pull out timing at WOT, you will need to pull at least 3deg's.

928JET

Double posted

928JET

Car is healthy, feels strong.

I have run aeromotive pumps and regs in the past on other cars so that's the way I'm looking ATM.

innovative sells a nice wide band..

I will run some colder Plugs and creep up on the jet sizes as I go.

Ignition/timing control will be also something to look into..what is your suggestion on that? I'd be looking first to a msd digital or similar.

davek9

Good that it feels strong, i'd suggest you do a compression test and make certain that the T Belt system is up to date.
I like the Innovate Wide-Bands and their Gauges and their monitoring tools, have them installed in two 928's.

The one w/ N2O is their Digital gauge, and I've been running a progressive N2O controller, so I set RPM and % of Fuel and N2O to spray and adjust software as needed to get the numbers where I want them.
However I'm logging, so no need to buy what is not needed, my N2O car is all stock as far as the fuel system goes and like I stated I'm spraying 150 wet w/o issues, I use the ECU's temp inputs (to fake hi temps) to pull out additional timing when spraying.

The Twin Screw I'm using their Boost Controller gauge, they also have one for N2O (the ECU's have been Shark Tuned for timing and fuel adjustment) and via monitoring and logging I'm running lean above 5,500 RPM, I'm going to need larger Injectors and more Fuel Pressure,
If that doesn't do it then I'll put in a larger F-Pump, from others who have helped me on here I'm following their path base on their experience with boost.

However I'm logging all that so no need to buy what is not needed, my N2O car is all stock as far as the fuel system goes, and like I stated I'm spraying 150 wet w/o issues, I use the ECU's temp inputs (to fake hi temps) to pull out additional timing when spraying.
There is a Individual cyl Knock Controller called Save Guard that I'm also installing on the SC car, you should look into that if you are doing track time.

You will find that it is going to be the weakest link that will fail first, think old head gaskets, hopefully you have LSD on that Trans

If you find my old Nitrous thread, there are some pic's of my setup.

please post some of your projects progress,

Dave

Mongo

How are you injecting your nitrous Davek?

davek9

I use the "Shark" nozzle that came w/ the Nitrous Express kit back then, they have new stuff now, it mixes the Fuel and N2O in a "Y" fitting, it's installed below the Hot wire in the MAF and that places it in the 4" to 6" recommended distance before the Throttle Body.
And as it's before the TB, you can always close the throttle

The stock ECU's don't even know it's there, they run along as normal, and the N2O system just adds the additional O2 and Fuel per jetting at the nozzle for a 5L to gain 150hp.
No button to press, just turn it on, when the set RPM is reached (approx 2500) AND Throttle Pos switch says WOT, woosh the added power comes on and rolls up to about 4500, then it hits 100% of Max spray, I cut it right around 6k RPM.

Looking back at my old thread I can't believe it been that long, it's time to go back through the system as it's been very reliable, biggest issue is maintaining correct bottle pressure in varying weather conditions, any intake leaks or poor spark wires, bad/weak intake valves would be a really BAD thing

So 928JET, make sure all that is good before you do this else you could watch your intake eject from the car
IIRC you stated you have an '84 Euro, so that has twin dizzy?
Make sure you put a fresh belt in there between them, 1 spark when an intake valve is open and ...boom goes the N2O and fuel mix that will be in the Intake!

Dave

Speedtoys

at what pressure?

not that i know, but you -really- want to be more specific.

928JET

928JET