Clio Meg RS320bhp conversion (update Meg Rad)
- Thread starter litchy
- Start date
Stephenvenning
Gold Member
I'd say around 350 with a 19t, some of the megane guys are running 350 with rs tuning hybrid which I believe is a td04hl 19t
Not sure my updated fuel pump will be up to it. I think it will require a return system and swirl pot to see those kind of numbers.
Ive had the 250 conversion for 3 years and seen 2 others. 350bhp is hard to make. Even forged Meg's 225 need something beyond an hybrid to see 350. My fuel pump now makes 5 bar but something is holding back seeing these figures. We think it might be related to the VVT. To date we haven't been able to get it going.
Need to look at the exhaust, the supersprint flows to around 230 so clearly the smaller pipe work is going to be restrictive. Need to consider selling the rear cans for custom 3' rear section.
TB Rich
Paid Member
[MENTION=1286]litchy[/MENTION] Just wanted to pick your brains chap on fuel pumps and systems as you seem to have done your homework here.
Is it correct that all Clio's and Meg's are returnless?
The Clio uses a pressure reg in the tank which is 3bar? - Is that part of the pump or separate to the pump but still in the sender?
The mk2 pump (225/R26) uses same setup as Clio, but 3.5bar? - So can I use a 225 pump and/or reg if separate in the Clio?
Mk3 (250 etc) uses 5bar in tank with a 3.5bar on the end of the rail? Still returnless?
Basically I'm making a [final] effort to make 240bhp NA now, stock injectors will already running close so looking at using bigger injectors and upping the fuel pressure. But I am only used to return systems with proper FPR's, this returnless stuff seems weird. My easiest option will be marginally bigger injectors (~330cc) but reall want to understand options around the fuel pump and how the regulation works. 3bar isn't high and better fuel atomisation with a higher pressure is a good thing with ITB's etc.
Cheers
Is it correct that all Clio's and Meg's are returnless?
The Clio uses a pressure reg in the tank which is 3bar? - Is that part of the pump or separate to the pump but still in the sender?
The mk2 pump (225/R26) uses same setup as Clio, but 3.5bar? - So can I use a 225 pump and/or reg if separate in the Clio?
Mk3 (250 etc) uses 5bar in tank with a 3.5bar on the end of the rail? Still returnless?
Basically I'm making a [final] effort to make 240bhp NA now, stock injectors will already running close so looking at using bigger injectors and upping the fuel pressure. But I am only used to return systems with proper FPR's, this returnless stuff seems weird. My easiest option will be marginally bigger injectors (~330cc) but reall want to understand options around the fuel pump and how the regulation works. 3bar isn't high and better fuel atomisation with a higher pressure is a good thing with ITB's etc.
Cheers
Stephenvenning
Gold Member
Youll need a return fuel rail as well mate, there is no way of plumbing in a return on the crappy oem plastic ones.
Stephenvenning
Gold Member
You could also just have the stock fuel pump filling a swirl pot and then having the high pressure fuel pump running off the swirl pot and then having the return also going to the swirl pot.
TB Rich
Paid Member
Would be easy for sure but don't want a swirl pot as I carry the kids in the car.
Want to investigate the Mk2 and Mk3 Meg options first as per the questions to Litchy before deciding on doing a return based setup. My feeling is if I can run a 3.5bar 225 pump that'll be fine, in the bodies I'll use probably IWP043's, or if I keep stock inlet then maybe Meg250's as I'll need the longer nose on them. They're a bit big but I understand the spray pattern to be good so not an issue. - Needs verifying though.
Want to investigate the Mk2 and Mk3 Meg options first as per the questions to Litchy before deciding on doing a return based setup. My feeling is if I can run a 3.5bar 225 pump that'll be fine, in the bodies I'll use probably IWP043's, or if I keep stock inlet then maybe Meg250's as I'll need the longer nose on them. They're a bit big but I understand the spray pattern to be good so not an issue. - Needs verifying though.
[MENTION=38628]TB Rich[/MENTION] Yep all returnless.
yep Clio runs reg in tank which is 3 bar. It built in the swirl pot where the 172/82 sits outside of the swirl pot so I guess it regs it somewhat different?
225 pump doesn't fit. Neither does the 250. Speak with shakyhandman, he'll build you a pump. It's in principle a 172/82 pump. They have a uprated fuel pump available (which 197 doesn't) and with its configuration allows you to change the reg without destroying the pump.
Hope that helps.....
Thanks. Can't find a replacement tbh so just continued going. Thought get a 250 but would just end up doing the same as I've done with Clio. Think of buying a damaged 200T and running 275 engine with a manual gearbox. Just waiting for the right car to turn up.
TB Rich
Paid Member
Cheers Litchy, I'll have to look at some pictures of them all I think and work out what I can use where then. But that is a shame the pump and reg can't be swapped easily with a Meg.
I've got a Walbro 255 pump (no fittings though) brand new which I never fitted to my last project, so maybe I can rebuild the mk3 Clio sender with that inside. I just need more flow at the injectors but I'm not at pump limits, or even potentially the injector limits once the pressure has been upped.
I know the R3 uses 3.5bar but not sure how it achieves it, maybe just have to buy some RS bits - probably cheaper in the long run!
I've got a Walbro 255 pump (no fittings though) brand new which I never fitted to my last project, so maybe I can rebuild the mk3 Clio sender with that inside. I just need more flow at the injectors but I'm not at pump limits, or even potentially the injector limits once the pressure has been upped.
I know the R3 uses 3.5bar but not sure how it achieves it, maybe just have to buy some RS bits - probably cheaper in the long run!
Clio Cup is equiped with 3,5 bar fuel pump as well , with bulit-in pressure regulator - it costs 140 euro +VAT or 200-ish along with fuel tank (as a kit)
Yiannis197
Paid Member
