corsa kid 1

i put bigger injeters in my 94 wrx (the old ones where a dark grey and the new ones are from a ra yellow in colour 440cc i think) but the car was running like a bucket of crap stinking of fuel it was late and i never played with it much will the ecu learn if so how long and if not what do i do to sort this?

Fantom

I'm not an expert, but I think you need to have it remapped to suit the bigger injectors. I don't think the ecu will learn to use the new ones, as its setup for the 380cc ones you have replaced. But don't quote me, I'm not an expert.
There are plenty of people on here who will know though.

Steve

corsa kid 1

cheers mate i'm sure the rest of the opinions will follow

WRX_Rich

iTrader: (5)

im not sure how the older models work but shouldn't be stinking of fuel, make sure there they are install correctly no leaks...

when I have installed injector on my02 they always needed a remap and in never ran that bad even with out a remap but i wasn't booting it

silent running

You can't swap to a different size injector without a remap. That goes for all fuel injected cars, not just Subarus.

Well, actually to be pedantic, you CAN swap to a bigger injector size as you have done, but as you've found out, it won't run properly, even if they physically fit the same. Your new 440cc injectors will flow more fuel every time the ECU commands them to open up, because nothing else has changed - same fuel pump, same regulator, therefore same fuel pressure. By remapping you will reduce the new injectors' duty cycle to get the fuelling right.

If you can smell fuel, check where it's coming from - the tailpipe or the engine bay. If it's the engine bay, then you've got a leak from where you were working on the fuel system.

ZEN Performance

Sounds like you have an injector leaking fuel. You can't use larger injectors properly on a 94 impreza without a remap. The cruise and idle should be okay if the lambda sensor is working, but there is no closed loop fuelling for WOT use, and the ECU isn't clever enough to use the correction it applies at light load to the rest of the map.

I would say you have left one of o-rings or various other rings fitted to the early injectors, in the fuel rail, and one injector isn't properly sealing.

Paul

corsa kid 1

yes guys there was a faulty o ring letting fuel direct in to the piston but this is fixed and the car is running perfect now cant tell any diff really but i guess there is now less chance of a melt down there will be a remap on the cards soon but i dont think it needs it to run propperly as it seems perfect

FB Tuning

iTrader: (30)

As mentioned above, the Lambda sensor should be able to catch and adjust the fuelling during closed loop, as you have only increased from 380's to 440's

However during open loop operation you are likely to be overfuelling.

At the very least, you should check your AFR's with a wideband.

[Davey]

Damn good job that you didnt just ignore it and hope it would go away

martyrobertsdj

iTrader: (1)

Does a MY98 have closed loop on WOT?

I to have a set of 440's, but was worried to fit them in case of bore wash, overfuelling, etc.

I wondered if I titted an induction kit at the same time, would they balance eachother out somewhat?

martyrobertsdj

iTrader: (1)

Does a MY98 have closed loop on WOT?

I too have a set of 440's, but was worried to fit them in case of bore wash, overfuelling, etc.

I wondered if I fitted an induction kit at the same time, would they balance eachother out somewhat?