[BMWTurbo]

Hi Guys,

I'm sorry to mine an old thread, but it makes more sense then starting a new onw for a similar question.

I have been using a home brew W/I system for a little while now and think I'm approaching it the wrong way.

I have the nozzle fitted cirectly into the throttlebody of my 2jzgte engine and I'm injecting through a '400cc/min' nozzle via a solenoid valve that is either On or Off. I don't have any fancy control over this only an On/Off switch.

The engine makes somewhere over 400rwhp and I'm at around 70% injector duty on 650cc/min injectors (6-off).

My trigger point is 3800RPM where the second turbo comes on and both turbo's run at about 23/24psi boost.

Working through the above I'm starting to think that I'm injecting way too much at this point (prompted by the fact I changed the plugs last night to NGK BKR7E's gapped to 0.7mm and I'm having the engine miss from the opening of the W/I valve until about 5500RPM where is cleans up).

The 10%-20% stated is a percentage of actual fuel injected and cannot be derived back from injector duty and injector size due to the fact the injector duration isn't enough to use this as a percentage.

IE I can't say 70% duty of 650cc/min injectors = 455cc/min roughly x 6 = 2730cc/min

So 10% of 2730cc/min = 273cc/min.

However that 273cc/min would be if the injector duration was the whole revolution but this changes with RPM.

With a single trigger system, is the calculation different then the usual percentage I see generally referred to?

I don't really want to gap down the plugs if I don't have to the engine feel much nicer at light loads with 0.7mm gap then it did with the old plugs gapped to 0.6mm.

I have what I beleive are decent coils and I'm also running a HKS Dli.