Good Afternoon,

My STI RA is having some nice big 550cc injectors, Walbro fuel pump, Walbro fuel Reg. with dial and a K&N induction kit fitted as I speak!

The main reason for increasing the fuelling is because I'm booked in to BRD for my Link ECU next saturday.......hooray!!!

I'll let you know if the first lot of mods. will make any difference as I'm off to Llandow this Saturday for my first trackday.......I'm a bit scared so I'm towing the scooby on a trailer!!!!!

Dom.

 

The mods have been done and theres not a lot of difference apart from the induction noise!!

One question is what should the pressure gague be reading on the fuel regulator on tick over? Mine is reading 2 bar of boost.

Cheers
Dom.

 

Pull the hose on the regulator - IIRC stock runs 3 bar at atmospheric (which is what you'll get by removing the hose).

2 bars on tickover sounds a tad low - but might be done on purpose to "adjust" for the larger injectors (but a well dodgy way of doing so imho, if that's the case).



/J

 

Unless I am mis-reading this, you've replaced the stock injectors with 550cc ones before you've had the Link fitted, ie still running the car on standard engine management. That's outside the scope of what it can correct for, and it will run darn rich until it's remapped. I would put as few miles as possible on it, and certainly not go too wild until it's mapped for the bigger inectors. Worst case scenario is that it'll bore wash, a piston will seize, a rod will snap and take the block with it. Don't mean to be a prophet of doom, but it's pointless damaging an engine when it's avoidable.

The fuel pressure should be about 2.3 bar at idle, or 3 bar if you disconnect the vacuum hose.

Hope this helps,

Pat.