Anyone who knows how big the stock injectors on the 1.8T vRS are?

I'm aiming for 240-245bhp, and around 260-265lbs/ft torque, with stock K03s turbo. Do i need to change the injectors?

Things done [x], or to be done [ ] are:

[x] CAI

[ ] Forge intake hose

[x] N75 Race valve

[x] Forge DV

[ ] Neuspeed IC pipe

[x] Forge FMIC

[ ] 3" DP with 100cell race cat

[x] 2.5" cat-back

[ ] custom remap

Not sure on size - 186cc I think but don't quote me on that.

They will be fine for 245bhp.

Steve

Are they realy that smal? I've seen 225cc mentioned in another forum, but i'm not shure that's correct.

How much power can i get out of them before i have to change the fuel pressure, and still be on the safe side?

I've found this:

(numer of injectors x injector flow [ccm] x duty cycle) / (0,5x10,2) = power (PS)

Is this right? The stock injectors have to flow 287ccm on stock engine or else you won't get 180PS.

Could i be that the formula is for power in kW, not PS?

Anyone got a clue?

Dont worry about injector size for the power your after. That will be no problem, but torque is more likely to be around the 250 lb/ft mark. The main restriction is the KO3s turbo being unable to flow enough air. Some say 240 BHP isn't possible but then you get into the old argument about rolling road accuracy!

Anyway with the limited turbo flow you won't get the running lean situation on standard injectors.

That sounds good. I want to get every bhp i possibly can out of the stock turbo. I've worked a lot on flow, so i hope to be close to 250bhp, but anything above 240bhp is bonus.

I have 253lb/ft already, so i hope i can find a little more torque.

I also found how big the stock injectors are. 321ccm@3bar! Bosch nr 0280 156 061. With a fuel pressure raise to 4bar, the injectors are good for over 270bhp (95% duty cycle)!

Do anyone know how much the stock fuel pump is able to flow @3 bar and @4bar?

Is it the same as in Audi and Seat 1.8T 225bhp engines?

another revival:

Just been looking at the injector sizes and this was the first one I got lol.

I keep my eye open for good deals and stuff so just needed to know,

can you put bigger injectors in and just have the map altered and still keep the fueling down?

For eg:

Put 373cc(BAM injectors?)or 440cc injectors in with std K03s and the stock 3bar FPR and either the std pump or a walbro 255 pump, then get the map altered and still have good fueling so its not running lean? and get around the 230+bhp

Then when the turbo comes up fit that and its all done.

not to exceed 300 bhp till the engine is done. but if a good BAM came up just pop that in.

tis all food for thought.

billy

The simple answer is 'yes'

but ...

not worth the effort tbh.

You won't gain anything from it, apart from less $ in your pocket.

Your mapper will have to do a custom map, to get the car to operate as it did before, and you could have emmissions issues too.

Its only worth changing the injectors and fuel pump when you're bolting a new turbo on. After the complete system is built, then get the mapping done.

The stock FPR is fine for 350+bhp, so no need to change it anyway.

As for fuel pump, the BAM fuel pumps are a more sensible option for < 350bhp use, & fit straight into the tank without worrying about fitting a walbro up to the swirl pot to avoid starvation

ah so the walbro is not just a straight fit then?

damn.

best look out for a BAM pump then. might see what a new one is from TPS when I put my shooping list in again lol.

would you say that BAM injectors are a bit too small for 300bhp? and whats gettable from a hybrid K04 setup with the BAM engine?

all Ideas rolling round as I am board of playing Red Dead Redemtion on the PS3 lol.

The walbro needs a special bracket to mount in-tank, you then need to run a hose from the end of the pump into the swirl pot ( not the flat mesh filter as in the photo )

You can use a walbro 'in-line', but then you still need to upgrade the in-tank pump to a BAM pump, and the in-line kits cost £100+ ( + cost of BAM pump )

From the research I did, the BAM injectors are a little too small, and not as adjustable as Bosch 440 greentops, or similar genesis ( 410's iirc )

The advise I uniformly got was to match the injectors to the desired output, as with the FPR.

From the research I did before upgrading, the hybrid route doesn't seem to deliver a cost -effective solution.

By the time you've got a decent exhaust manifold, and upgraded the rest of the boost pipework, it makes more sense to bolt an IHI on.

The INI VF34 is the biggest turbo you can get away with on stock displacement, without slaughtering you boost threshold.