Planning to turbo my 2003 Yamaha R1 (5PW injected)

[hobbsy]

Hello all.

I'm in the UK and this is my first post.

There aren't many turbo bike forums in the UK, only one really and that got filled with spam after a while.

I have a Yamaha R1 engine (2003 vintage the first injected 5PW model) in a kit car (weighs around 1000lb).

It seems like most of you guys on here are running Busa's - any turbo R1 owners on here?  I tried a search but only found one of two posts (either early carbed or late model injected)


Anyway I've been thinking of turbo charging it for a while and have been accumulating some of the key bits (like a Mitsi TD04HL-16T turbo and flanges).

I recently had issues with third gear so now it needs to come apart... I might as well rebuild it as a turbo charged engine.

I was hoping to keep it fairly low cost and run <10psi on a stock engine, just lowering the comp ratio with a thicker cometic head gasket or similar.

Then I bought I saw some brand new PPM H-beam forged conrods going cheap.

So now I may be fitted JE pistons (9 or 10:1) and possibly APE head bolts etc.

I'm still after reliability rather than outright power as 1) in a car you are at WOT a lot more than on a bike (more grip, drag and weight to pull) and 2) I don't want to kill another gearbox.


Anyway my current main concern is that of fuelling.  I don't really like the whole FMU / rising rate FPR and a powercommander (and a prayer) as it seems a bit of a dirty way to do it.  Surely a forced induction injected engine should mapped using MAP and not just TPS and a load more fuel pressure.

So this appears to give me two options:

1) secondary injectors with the Megasquirt I have lying around.  I'm concerned that if the MS suddenly dies (they don't seem the most reliable unit in kit car applications) then so does my engine it would still run (albeit very lean) on the original ECU's fuel = LEAN.

2) standalone ECU (I can get a good deal on an OMEX 600 or 710) and possibly bigger injectors (stock are 240cc/min, I've got some direct replacements that are 320cc/min so a 1/3 bigger).  Or if I get the 710 I can control up to 12 injectors (8 should be enough) and do staged injection.


Any ideas or comments welcome (this would be a bigger post but I've got to go out).