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Old 03-24-2001, 11:52 AM   #1
FuJi K
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Question stock fuel injecters/450hp VS more better fuel injecters/450hp

i was woundering if i need those fuel injecters that give more fuel or just use the stock injecters when combined with a 450hp turbocharger? i was thinking that if more air is coming into the cylinders then i need more fuel too right?? wouldn't it run richer with less fuel and more air? help me out guys!!!!! do i really need larger fuel injecters when a large turbo is installed into my Future Impreza so the air fuel ratio would be the same?

FuJi K (15yrs old and learning)
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Old 03-24-2001, 11:58 AM   #2
8Complex

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I think the stock injectors in an RS will run up to about 275hp or so. I know without more pressure they won't provide enough fuel after like 6psi.
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Old 03-24-2001, 03:29 PM   #3
Sunrise City Rider
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Damn Fuji, You gonna kill yourself before your 16th Birthday with that kind of power. Lets try to get about 300 first and then we'll talk about 450, Cool?
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Old 03-24-2001, 04:34 PM   #4
FuJi K
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that'a my goal!!!! +++450hp into an Impreza RS Sedan!!!!!!! so i need some facts here. big injecters w/ that iSR 450 hp turbo OR stock injecters with iSR 450hp turbocharger???????? who cares how old i am, i want info just like everybody else. give me the 555 pros and cons!!!!!

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Old 03-24-2001, 06:18 PM   #5
98mpreziveRS
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dude..no way are you going to get 450 HP out of the stock injectors..just not going to happen

you can bore the stock injectors out..but that is only effective to a certain point..which is no where near 450HP

also, your internals are going to need replacing to get that amount of power, get some good J&E or other such pistons from Cobb or similar (forged ) at a 7.5:1 ratio or thereabouts, and redo the heads for sure as well as the valving and camming, then you can see 450 easier, due to increased breathing, after you have also opened up the exhuast ports on the motor and intake manifold.
to get 450 horse out of an ej20 is relativly easy compared to getting 450 out of a motor that does not come with a turbo intended for that power IMHO start with an ej20 turbo swap

and the tranny must go, as well as the diff's, and axles

i could go on and on..not to be mean..but just to show that it requires a huge $$$ investment, and speed costs lots of $$$..so how much $ ya got?

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Old 03-24-2001, 06:20 PM   #6
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Try 500CC or 550CC injectors and a good Walbro or Supra TT or RX-7TT fuel pump.

Also, if you want a *daily drivable* 400+ HP, plan on spending the bucks for a good ECU. TEC-2 is ok, Motec is far better, but more complex to tune. I'm getting a Motec M48 Pro on my car.
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Old 03-24-2001, 06:26 PM   #7
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Alright, alright, cool it. If you are going to run numbers that high, you will need something like 720 cc injectors. You will need to maximize the porting and polishing of the heads and run some aggresive cam profiles to get enough air to mix with all that petro. Fire it all with as strong a spark as you can and it will get that flywheel turning for sure. The entire insides of your block needs to be strengthened to the max, in my opinion. Pressure will be so high inside that little engine so get everything cryo'd and coated, again in my opinion. Now that you can make the power, lets consider getting it to the ground without snapping hardware. Gears should be on your list to begin with, but, we started with the power. So, lets see, our engine is sitting on a stand, because to make that kind of power reliably you need more than just gauges and a J&S, again in my opinion, you need a dyno and there is a lack of 4 wheel dynos so the next best is an engine dyno. Check out the latest SCC for info on gears and you mentioned ISR so stick with them when you want to upgrade your gears. I hope this little scenario helps.
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Old 03-24-2001, 06:53 PM   #8
FuJi K
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Check out my site here. Go to the my Modifications Page and see if the Mods will withstand the power output. Thanks!!
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Old 03-24-2001, 07:11 PM   #9
98mpreziveRS
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you are going to need a TEC2 or Motec or such system to handle that rather than just an SAFC, FPR, ITC and boost controller.

You will have a much safer running car if you ditch the piggy back and stock ecu (well..not literally..just the part that controls the motor..still physically there..just hacked into by the aftermarket controller) for a safer and more reliable way of tuning that power.

For that size of a turbo you will need right around a 3" or larger down pipe to get sufficent flow , the fuel pressure riser isn't going to help much with stock injectors and that large of a turbo , most likely i would get a whole new ignition setup as well to get the best spark possible as well as some cold plugs to help resist det. and that should be a good start among the rest of what you have there

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Old 03-25-2001, 12:29 AM   #10
WRXwannbe
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well the stock ones I suspect won't run anything past 7-9PSI (if you want extended life).
I don't know if you know how FI and injectors work, but injectors have a duty cycle.

Shiv will say that the stock ones will reach 80% duty cycle at 1 psi. I beg to differ.

If you buy a wolf, motec etc...Aftermarket ECU you'll be able to peak at about 240 bhp out of the stock injectors.

if you use piggy backs, look to see about 220bhp.

if you have the will and the money for even 300hp I would say getting bigger injectors is a very good idea. You can get some cheap STI injectors 450cc for like $300 out of australia.
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