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Megane RS250 engine into R26 - using mk3 fuel pump

Ewan

Active Member
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?
 
The 250 engine is quite a bit more developed than the 225. As mentioned above, the head is improved and has a better flow. The internals in the 250 engine are a good bit stronger too. Coupled with a better fuel system it makes for a better base engine than the 225.

From my understanding though, I think the 225 ECU is an easier swap in the Clios. The 225 gearbox is also an easier swap for the Clio item. It's probably easier to get the entire 225 package rather than try mixing and matching with the 250 engine.

The French guys have been doing this swap for quite a few years into 225s and mk3 Clios. Over here it hasn't been that popular yet. Could be that the 250 engines go for a whole lot more money than 225s and were until recently fairly hard to come by in good condition.
 
Well I can confirm that trying to modify the existing 225 fuel pump body to take the 250 regulator and pump is not possible. The regulator size is completely different, and the body is too different to try and swap parts. It turns out that the 250 fuel pump body is shorter than the 225 pump body.
After all that effort, can't really be done all that easily. It seems the best way to go is an external pump but that costs way too much and would require fitting teflon lines with a return from the rail. Not worth the effort unless you are going all out track car, and even at that if you are going for a proper track only car.
@tutuur My mechanic did get pictures of the fuel pump numbers, but he hasn't sent them to me yet. I have the pump down the stairs so if I can figure out how to dismantle it I will take some pics for you.
 
Having had a couple of beers now, am thinking I will pick up a 230 fuel pump and have another couple of attempts at this. If it can be done with the standard pumps it would make this swap all the better. More fuel pressure is always a good thing in turbo'd cars in my mind.
 
in case of the 225 pump you won't have to dismantle it, not sure for the 250 pump. Please giveme as much numbers of the pumps you have, always good for future reference!
 
Tbh I'm pretty sure they're will be a walbro/sytec/aem etc.... fuel pump that is the same size as an OE 225/230 one and also capable of flowing at 5 bar.

I've asked the question on faceache as well
 
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?

As I currently have the 225 Conversion and having driven the 250 Conversion 2 days ago, I can tell you that Meg 3 engine with Meg3 Ecu and vvt working is quite worth the extra cash;-)
 
Tbh I'm pretty sure they're will be a walbro/sytec/aem etc.... fuel pump that is the same size as an OE 225/230 one and also capable of flowing at 5 bar.

I've asked the question on faceache as well

You can get uprated pumps from the French site I linked above that for the OEM 225 pump body. Not sure what regulator would fit though, think the one on the 250 pump body is larger and not a direct swap.
 
The Clio 182s run a single fuel line and they just have a Bosch fpr on the sender unit. I assumed the Meg would be the same just higher pressure.

I guess the best thing to do is pull the Meg sender out.
 
Well bit of a result, some thing in the back of my mind said my little bro had changed his pump on his R26.

So I gave him a call and sure enough he had and it was in his shed. Just here now picking it up and it's s full sender unit. Will look at it properly tomorrow to see what the size is and post it up. He did mention that he'd read that when people were upgrading the pumps that some people were having the wires burn out...... so will have to look into that.
 
The regulator on the sender should just clip in. Can you pop it out and take some measurements and pictures of the serial number? Will do the same on the regulator from the 250.
 
Of course mate. I need to swap the pads on the front of the Meg tomorrow and pull a rod out of the 250 engine on the bench, so while I've got my grubby kit on I'll pull the sender unit apart and take some photos
 
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