Megane RS250 engine into R26 - using mk3 fuel pump

[Ewan]

I am swapping the engine in my R26 with a RS250 unit retaining the R26 ECU and loom. Should clarify at this point that 'I' means 'I am paying Rentec in Edinburgh'

Ok, so we are keeping the R26 ECU and loom and swapping in the RS250 engine with turbo and the mk3 inlet manifold, fuel rail and injectors.

I know that we should be able to run the RS250 engine with the existing mk2 fuel pump, although it won't offer the rising rate fuel pressure. The question is can we fit the mk3 fuel pump to my car and take advantage of the rising rate rail with the mk2 ECU and loom without a massive headache?

 

[Duncan Grier]

Bit the bullet and buy full pump and housing and between the 2 sure it could be worked. If not sell pump on

As mentioned before I just used a decent correct spec'd pump and works fine. Can you not do this and change fpr?

DG

 

[Ewan]

Bit the bullet and buy full pump and housing and between the 2 sure it could be worked. If not sell pump on

As mentioned before I just used a decent correct spec'd pump and works fine. Can you not do this and change fpr?

DG

I am beginning to come round to the idea, using the Renault fuel pump just makes life a bit easier by ensuring that the plumbing, wiring and voltages are all compatible.

 

[Ewan]

Can you mention that he is welcome to join this Church ..

How about if I tell him that unless he joins here, I won't be buying anything

 

[andybond]

How about if I tell him that unless he joins here, I won't be buying anything

Harsh.


But fair.

 

[tutuur]

Ask him what number is on the pump connector itself if you don't mind?

Would be interested in if i could find the flow it's capable off and might help with finding dimensions aswell

 

[Ewan]

Ok, so some progress has been made on this. I have decided to source a RS250 fuel pump to see if we can fit it, or somehow butcher it to fit! Having the rising-rate fuel rail is a better, safer option.

It is quite interesting seeing the difference in the fuel injectors between the RS250 and the 225. The 225 has a short body, but the RS250 injector is quite different with a long body below the O-ring. Thankfully, it seems that uprated 630cc injector for both cars is the short body model.

 

[tutuur]

The short nose 630's wouldn't be my choice tbh but it eems RStuning does pick them. The injector in the 250 sits way more up the manifold flange....

You bought the fuel pump of RSmegane? If you receive it please let me know what letters/numbers are on the pump itself!

 

[Ewan]

The short nose 630's wouldn't be my choice tbh but it eems RStuning does pick them. The injector in the 250 sits way more up the manifold flange....

You bought the fuel pump of RSmegane? If you receive it please let me know what letters/numbers are on the pump itself!

I agree with you on the injector choice, but I am happy the ones I have will work. The sooner I get this car running the better!

I haven't got the pump yet, but I will get a picture of the top of the pump for you. Are you looking for the part numbers? If you are I can find them for you.

 

[tutuur]

Yeah mate, the part number of the actual pump. Will be on the black connector housing

 

[Ewan]

Got a RS250 fuel pump and finally have picture of the top of the pump. Part number on the pump (172020030R) matches that given in the online parts catalogue: Renault

 

[tutuur]

Need the number on the pump itself mate, this is just the part number for the body

It's on the black bit at the top of the pump.

Could use the Clio's number too btw

 

[Ewan]

Need the number on the pump itself mate, this is just the part number for the body

It's on the black bit at the top of the pump.

Could use the Clio's number too btw

Ah, didn't understand. Not sure I will get the chance to get that part number as the pump is now with my mechanic. Will see what I can do for you. Btw, there is a French Megane parts site that sells standard fitment pumps with increased flow rates, ones that will fit in the body.

 

[Ewan]

Found the site, although you will need either a good grasp of French or Google translate.

Pieces pour Megane RS - Préparation Moteur - Turbo - Freinage etc ... - Megane RS Online

If you do a search for 'pompe' there are a few options with increased flow.

 

[tutuur]

I know which one they use, going to use the dw400 myself, only 1cm taller and 1mm thicker, has less output but also less current draw. The output of the dw400 is plenty anyway.

Please get in touch with your mechanic mate, would be good to know how much the standard pump is able to flow

 

[SP33DY]

Keeping an eye on this as I'm doing the same conversion

 

[DannyAG200]

What's the reason behind putting a 250engine in? As far as I'm aware you cannot use the vvt so seems abit silly to pay extra for a 250lump and modify it to fit rather than forging a 225/230 engine.

That's the reason 250 engines are pointless for Clio conversions?

 

[SP33DY]

Like for like the 250 is a better lump by far. The turbo flows more, it has wilder cams and it has a much better cylinder head. It also has stronger internals which have been proven to mid/high 300s. The fuel system also allows you to do away with the need for an external fpr.

So I guess the real suprise is why more people aren't using them


Everyone keeps chatting about vvt as though it's the sole reason for the power, the truth is its mostly used to spool the turbo and at high rpm on boost it will be switched off. A vvt delete is pretty easy to do.

 

[Big Steve - Raider]

Can you mention that he is welcome to join this Church ..

Thank you Reverend @andybond

 

[andybond]

Thank you Reverend @andybond

Genuine LOL there

 

[tutuur]

Like for like the 250 is a better lump by far. The turbo flows more, it has wilder cams and it has a much better cylinder head. It also has stronger internals which have been proven to mid/high 300s. The fuel system also allows you to do away with the need for an external fpr.

So I guess the real suprise is why more people aren't using them


Everyone keeps chatting about vvt as though it's the sole reason for the power, the truth is its mostly used to spool the turbo and at high rpm on boost it will be switched off. A vvt delete is pretty easy to do.

Exactly my thought! The vvt is nice for spooling the turbo but on top revs the tables are set to zero!!

You could use the VVT in a Megane though, remember the Clio 3 uses the exact same ecu and does have VVT, only trick is to figure out how to get it activated in the ecu. Something i will be investigating when i finally convert to the 250 engine.