Someone Stole My Kw's !

[Adriano]

Kier Wilson (I think it's him) runs his 8 second drag car on stock RB26 head. This would indicate a flow capability of much more.

Are you sure, i dont think one of the fastest gtr's in the world with a $40000 bottom end would be running a stock head, ill bet it has big valves and a comprehensive race port job to make its 1200hp at 10000rpm

[cameron]

Are you sure, i dont think one of the fastest gtr's in the world with a $40000 bottom end would be running a stock head, ill bet it has big valves and a comprehensive race port job to make its 1200hp at 10000rpm

3lit3 32 is correct.

[Sydneykid]

Since you haven't posted up an A/F ratio graph it's a bit hard to be specific on what might be the problem with the power output.

Equally as hard to be decisive regarding the need for an AFM upgrade without knowing what sort of voltages they are seeing at what rpms.

Did you run it with a fuel pressure gauge connected? That will tell you if you have a fuel pressure fluctuation problem that could be causing the drift in A/F ratios.

Where are the camshaft pulleys set at? It seems to have a very decent amount of mid range power. Maybe the lobe separation (advanced inlet and retarded exhaust) is a bit much. GTSS’s have lot’s of bottom end, quick response and fast boost build, so you don’t have to “help” them out with excessive lobe separation. Better to use their natural abilities down low and adjust the camshaft timing to help their top end.

That’s about it, other than I hope you are running it on Shell V Power as that makes a noticeable difference when tuned for it.

cheers

[nfi]

I would agree that your AFM's are maxed out but I interpreted that you were getting wayward afr's on cruise, therefore in closed loop.

If thats the case then the afms won't be maxing out. My guess would be one of two things:

1. Your AFM's are stuffed and giving out inconsistent readings

2. Your fuel pressure is all over the shop.\

3. (not sure on this one) Maybe TPS (throttle position sensor)

I would have thought that for AFR's to be inconsistent there would have to be a sensor giving out consistent voltage. Find it and my guess is it would fix the problem.

Regarding the power- I think sydneykid and a few others have covered that off far better than I can.