Megane Injectors ?

[TimR26]

How much Autouba? Age, milage on them etc. I wouldn't mind some as mine OE ones are running about 93% duty.

They've done 4000 miles, clean and ready to be fitted and calibrated. I'd only sell if the offer was good enough.

 

[Tony Hunter]

perfect, absolutely ideal. I told Jay to get some ages ago

It's all money though,it's not that easy.

 

[maty j]

They've done 4000 miles, clean and ready to be fitted and calibrated. I'd only sell if the offer was good enough.

1 curly wirly, 1 sherbert dip dab and all the orange jelly babies from this pack I'm scoffing?

How much you looking for? Save spamming the thread I'll try PM'ing you... If I can as I'm not paid up.

 

[RSTuning]

The Megane injectors are 380cc +- not 440cc

 

[Tony Hunter]

I'm confused now.

 

[Dan519]

they are ~440. but on a single fuel line setup, with boost they give a lower flow potential, making them appear smaller

 

[RSTuning]

At what fuel pressure?

 

[Dan519]

3 bar

 

[RSTuning]

Interesting because all the data we ever found showed them sub 400cc but we have not personally tested them on the bench.

 

[Dan519]

on a single fuel line, with say 1.2 bar of boost, you're effectively using 1.8bar of fuel pressure (when it's 3bar atmospheric). This will very obviously cause the flow potential to be lower by a significant amount. All down to pressure differential at the injector tip

 

[Chip-mk1]

on a single fuel line, with say 1.2 bar of boost, you're effectively using 1.8bar of fuel pressure (when it's 3bar atmospheric). This will very obviously cause the flow potential to be lower by a significant amount. All down to pressure differential at the injector tip

If they were 440@3 bar, then they are only about 340@1.8 bar

 

[RSTuning]

on a single fuel line, with say 1.2 bar of boost, you're effectively using 1.8bar of fuel pressure (when it's 3bar atmospheric). This will very obviously cause the flow potential to be lower by a significant amount. All down to pressure differential at the injector tip

Yes of course because the "effective" fuel pressure can't remain constant on a returnless system. I have tried to find the data i had on the injectors but no luck so far. Also a thing to remember is that the base pressure on the meg is 3.5 bar so it makes it SLIGHTLY better and if they are 440 cc they'd be closer to 480 at that pressure.
Why renault did a returnless system on a turbo car is beyond me though, they learnt a little with the 250 allowing for a FPR on the rail but still no return on those either...

 

[Dan519]

not had a 250 in at all yet, does the regulator have a vac/boost feed?

 

[RSTuning]

Yes they do and at a glance it looks to have a return, it however doesn't, instead it has a 5 bar reg in tank plus a 3 bar on the rail

 

[wazzabii]

Hello all,
sorry for bringing such old topic back, however you mentioned quite important subjects for me.

I'm owner of Megane II 2004 2.0 petrol turbo CC. Since I have this car (1 year) I have a slight problem with misfire. I'm quite close to change all 4 injector at the moment as I already changed pencil coils, spark plugs, filters etc. Tried cleaning injectors etc. I also changed o-ring on them as they were not good anymore (in my opinion).

In your posts you mentioned about brown and blue injectors labels. At the moment I have 3 brown (old?) and 1 blue (new?). Can that be a source of my misfire as one of them got a slightly different spec? Engine can't get stable idle rpms as it is all the time trying to adjust... There is also puffing into exhaust, however it is hard to get blinking check engine light - blinks only on idle after really "hard use" on hot day.
I got CAN CLIP and after swapping injectors I found misfire on other cylinder.

another question is : do I need to do any calibration after changing injectors as I did not see any function like that? I might have quite old software as I did not update it for long. Can that be done by DDT2000 as well ?
I know about coding injectors in Common Rail engines, but not petrol....

Interesting for me is also fact that there is no return plus no regulator as it is on same engine but aspirated....

I would really appreciate your answer, as I would like to know cause of my problem (I'm engineer...). I'm quite sure it is something to do with those labels and spec...

regards,
Marek

 

[scotty2hotty81]

Bin the brown injectors, get blue labeled one to replace them, no calibration needed plug and play.