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?

 

[Ewan]

That's what i've told you al along. You can fit the 250 one after putting it in a lathe to reduce the diameter of the nose

I will get round to getting the 250 fpr fitted, but it would require a remap and Paul is miles from me [emoji23]

 

[tutuur]

I'm even further sadly:ag:

 

[Ewan]

Where are you @tutuur?

Edit: it's too early in the morning. I read your build thread and you are in the Netherlands

 

[tutuur]

Lol!

 

[Danith]

You should'nt need a map for an uprated pump?
So the ph1 225 has a better fpr?
I'm going to buy a second hand housing unit and a drop in pump for mine so would be interested if i should look for a ph1

 

[Ewan]

You should'nt need a map for an uprated pump?
So the ph1 225 has a better fpr?
I'm going to buy a second hand housing unit and a drop in pump for mine so would be interested if i should look for a ph1

You don't need a map for changing the pump. We were talking about changing the fpr to lift the fuel pressure from 3.5bar to 5.5bar, which depending on circumstances will need a map. I have a secondary fpr at the rail that limits to 3.5bar so I could probably get away without a map.

Need to take the fpr out the body from my R26 to get a closer look, but it certainly differed from the 225 body I bought.

Only downside with the 225 body is that the plastic is so brittle that you will almost certainly crack it when removing the pump. But just use a soldering iron to plastic weld the crack up, assuming you haven't destroyed it in frustration!

Also, if you go for the uprated pump don't forget to wire in some better feeds. If you use the standard wiring you will have a good chance of burning out the UPC.

 

[Danith]

Yeah I read up about a hard wire actually. I'll be honest I'm not quite sure what that entails tho!
Good pt about the brittle plastic, think ive sourced one locally to try now so will see

 

[Danith]

You don't need a map for changing the pump. We were talking about changing the fpr to lift the fuel pressure from 3.5bar to 5.5bar, which depending on circumstances will need a map. I have a secondary fpr at the rail that limits to 3.5bar so I could probably get away without a map.

Need to take the fpr out the body from my R26 to get a closer look, but it certainly differed from the 225 body I bought.

Only downside with the 225 body is that the plastic is so brittle that you will almost certainly crack it when removing the pump. But just use a soldering iron to plastic weld the crack up, assuming you haven't destroyed it in frustration!

Also, if you go for the uprated pump don't forget to wire in some better feeds. If you use the standard wiring you will have a good chance of burning out the UPC.

Just replied to you on RSMegane! Sorry I didnt' realise I'd already seen this thread - I use tapatalk so get mixed up!

Ta will have a read.

 

[Danith]

Got the 225 ph1 body - you're right the FPR does look different but still 3.5bar.
dunno if it'll be any use to me then.
I'm at the point now where I cba reading anymore, just want a better/new pump to drop into my R26!
I'll sort a return rail later