Hi guys

Does anyone no a place that sells bigger injector nozzles for the 1.9 8v engine?

Many thanks

Just out of curiosity,
Why?

I had a scout round and apparently they're only available custom made. The best trick seems to be to fit a 16v JTD high pressure pump, which allows you to raise the fuel rail pressure from 1200bar to 1500bar.

The question still remains - WHY?
The power produced depends on the amount of fuel burnt.
The fuel burnt depends on the amount of air to provide the oxygen.
Diesels run on excess air, but the problem of using it is fuel mixing. This depends on the air swirl within the combustion chamber, part of the overall design, not something you can change.
Adding more fuel will not give more power, just more smoke, higher costs and possible less power as the excess fuel drowns the combustion process.

If the injection is mechanical, amount of fuel delivered depends on pressure produced and injector opening pressure. The fuel pressure lifts the injector needle off its seat. Just adding larger injectors to this system is likely to result in poor fuel atomisation, so less power and lots of wasted fuel. The fuel needs to be injected as a very fine mist in order to mix with the air and to combust promptly. Mechanical pump and injectors need to matched together and to the engine.

If the injection is electronic, larger injectors need to be matched to the ECU as it will need to lift the needle less or for a shorter time for the same fuel delivery. If it lifts the larger injector the same as the original, you just get more fuel injected, but not necessarily with the ability to burn it. If you want more power, push the throttle pedal more! If the max power of the engine is not enough for you, gaining more is more complex than bigger injectors.

So what are you trying to achieve?

The spec of my car as it stands atm. Is k&n panel filter, large front mount, 2.5 inch straight threw exhaust. Stage 3 hybrid turbo. I don't think the injectors are pumping in enough fuel to run at 2 bar boost. it fills like the car dies out at high speed and when high in the revs

Diesels don't rev as high as petrols, but if it can accept more fuel, larger injectors will do this. But, you cannot just stick bigger injectors in, the whole system needs calibrating to put the right fuel in all across the rev and boost range. Not a DIY job.

Sure he wasnt intending on a diy job was just asking if theres an off the shelf product that fits but yes will need injectors fuel rail pump etc and then a good deisel tuner, is there any of the above

16v fuel pump to raise the fuel pressure should be enough to support 200+bhp. Can't find any info on where to go from there, must be somebody who's gone further bhp wise on an 8v.

16v what? Bravo

16v JTD so whatever they came in - Alfa 156 and 147 and a few others iirc.

Straight swap, cant see too much more fuel going in to be honest, surprised there not the same

And would you need some special injectors to compensate, i read that the stock injectors are good for 200+ anyway

They're higher pressure apparently (8v JTD rail pressure is 1200bar, 16v is 1700bar. The pumps do look the same, I wonder if the 16v just has a smaller pulley to make it pump harder. This is all from what I've read btw not tried it. Most has been translated from Polish too haha.

Ahh right thats interesting, still the injector saga, id leave it lol or get a faster car as everyone says ha

Good luck its common knowledge the fuel injection system is the limit on dervs. Should see nice meaty power with that limitation gone, if done properly of course.

Magic Johnson said:

Good luck its common knowledge the fuel injection system is the limit on dervs. Should see nice meaty power with that limitation gone, if done properly of course.

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Im confused did you just contradict urself in same post lol can you or cant you ha

TJet180 said:

Im confused did you just contradict urself in same post lol

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???

First bits says common knowledge about the limit and then next bit says meaty power with no limitation, was a little puzzled

The original manufacturer spends a lot of time matching pump, injectors and ECU to the engine characteristics. Changing one part of the setup will affect the others. Any changes need to be done by a specialist who understands how to match his modifications with each other and to the engine. Just bolting bits on is unlikely to bring complete success.

TJet180 said:

Sure he wasnt intending on a diy job was just asking if theres an off the shelf product that fits but yes will need injectors fuel rail pump etc and then a good deisel tuner, is there any of the above

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My original post above yes your correct, i wouldnt bother personally