Does anybody here have specs on the MINI Cooper S fuel delivery capacity, specifically max capacity of FPR and fuel pump?

Thanks!

 

spillman has found that 400wHP is pushing the max of the stock fuel system

 

Not sure, but Dinan obviously didn't think it was enough.

 

The spec for fuel pressure is 3.5bar, and I haven't noticed any flow specs for the pump. If it's the same as BMW it's 1 liter/30 secs.

I'm surprised that twincharge kits and other high hp kits don't replace the pump or rail. I guess it has enough flow to keep the engine fed w/ even bigger injectors

 

Can anybody confirm the 2 l/min and at how many bar?

 

The only aftermarket fuel rail I know of is from Marren, and Nuzzo uses it on their MCS's, though I don't know why, they don't make much power compared to the +turbo MINI's. Marren's rail is for non-returnless systems, fyi. If you go return-line fuel system, the sky's the limit because you can slap whatever pump you want in there.

 

We offer an upgraded fuel pump for the TC guys and for our kit. The reason being is the stock pump works and flows enough for any SC pulley, but when it comes to TC kits, and over 250WHP there is enough pressure drop that it will be an issue. This pressure drop is very natural on any system, and can be taken up by long injector opening/duration, or by installing bigger injectors. So with a high HP TC kit they might need larger than 550CC injectors to make up for this. With our fuel pump, and 550cc injectors, you will not have any fuel supply issues like this.

We use the very very standard Walbro 255lph high pressure pump. The kit is more than just a pump, but the important thing is it flows 255lph at 43psi, which is enough to easiliy support 500WHP. The fuel pump in the mini is a Siemmens/VDO pump. Using normal car manufactures over building of things like this, it probably flows 100lph at 43psi. which is enough to support stock HP plus a very clogged fuel filter.

What size injectors and at what DC Spillman is seeing? Maybe he can chime in?

 

John Behe of Lucky Dog Garage has been doing some fiddling with the Mini's fuel delivery system... He said there's a couple of things that could use some improving, such as the fact that it's a no-loop no-return system... He has custom modified ones for use in his mule mini... Maybe he'll be kind enough to share his details here, but I doubt it, because he spends most of his time fixing or modding DCMM Minis, tinkering with his own, or attending Mini events.

 

Converting to a returning fuel system isn't that important. The only reason for doing that is to be able to adjust the fuel pressure to increase or decrease fuel delivery(old school method. The AFC, and other user tunable electronic fuel controllers do this job much more simply and more accurate. A great example of high HP car with returnless systems are Neons running around with well over 300WHP! These guys also think they need to go return type system, but with the right fuel pump they don't need to.

 

Right, obviously it's not required for our machines, or BMW engineers would have done it, or it would be a popular aftermarket mod...

I meant to illustrate that Mr. Behe feels there's advantages to be had with a returning fuel system for performance applications. I cannot remember them per say, but they were quite logical at the time... If I can pull one out of my ***, it would be related to temperature, and the fact that in the Mini's the fuel sits in the engine compartment fuel rail until it is spent... As opposed to a return system where the fuel would appear at the injectors at a cooler temperature.

Not sure how accurate that is, compared to what he actually told me... But like I mentioned, it all made good sense at the time...